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Pieger, Matúš. "Sledování řidiče." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442532.
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This master’s thesis deals with the design of systems for data collection which describe the driver’s behaviour in a car. This data is used to detect risky behaviour that the driver may commit due to inattention caused by the use of either lower or higher levels of driving automation. The thesis first describes the existing safety systems, especially in relation to the driver. Then it deals with the design of the necessary measuring scenes and the implementation of new systems based on the processing of input images which are obtained via the Intel RealSense D415 stereo camera. Every system is tested in a real vehicle environment. In the end the thesis contains an evaluation regarding the detection reliability of the created algorithms, it considers their shortcomings and possible improvements.
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Robinson, J. "ADDS : An Ada dialogue development system." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374926.
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Agha, Jafari Wolde Bahareh. "A systematic Mapping study of ADAS and Autonomous Driving." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-42754.
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Nowadays, autonomous driving revolution is getting closer to reality. To achieve the Autonomous driving the first step is to develop the Advanced Driver Assistance System (ADAS). Driver-assistance systems are one of the fastest-growing segments in automotive electronics since already there are many forms of ADAS available. To investigate state of art of development of ADAS towards Autonomous Driving, we develop Systematic Mapping Study (SMS). SMS methodology is used to collect, classify, and analyze the relevant publications. A classification is introduced based on the developments carried out in ADAS towards Autonomous driving. According to SMS methodology, we identified 894 relevant publications about ADAS and its developmental journey toward Autonomous Driving completed from 2012 to 2016. We classify the area of our research under three classifications: technical classifications, research types and research contributions. The related publications are classified under thirty-three technical classifications. This thesis sheds light on a better understanding of the achievements and shortcomings in this area. By evaluating collected results, we answer our seven research questions. The result specifies that most of the publications belong to the Models and Solution Proposal from the research type and contribution. The least number of the publications belong to the Automated…Autonomous driving from the technical classification which indicated the lack of publications in this area.
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Nos, Pavel. "Využití průmyslového senzorového systému ADAM pro laboratorní měření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217288.
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Main task of the Master Thesis is to introduce into sensor systems used in the field. On Advantech sensor system with use of ADAM 4000 modules is shown decentralized sensor system which comunicates over RS 485 and using master computer. Within Master Thesis was compiled measuring board and were assembled three programs which demonstrate possible use of different types of modules. Main development environment is used ADAMView. Each modules has different number and types of inputs and outputs. Using of sensor system saving measurement time, increasing measurement effeciency, relieves data processing and automatize measurement.
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Martinez, Leandro Andrade. "Um framework para coprojeto de hardware e software de sistemas avançados de assistência ao motorista baseados em câmeras." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-06122017-104613/.
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A demanda por novas tecnologias, melhoria de segurança e conforto para veículos urbanos cresceu consideravelmente nos últimos anos, motivando a indústria na criação de sistemas destinados ao apoio de motoristas (ADAS - Advanced Driver Assistance Systems). Este fato contribuiu para o desenvolvimento de diversos sistemas embarcados na área automobilística destacando-se, à prevenção de colisão a pedestres por veículos. Através do avanço em diversas pesquisas, começaram a circular pelas ruas veículos com sistemas anticolisão e com navegação autônoma. Contudo, para alcançar objetivos cada vez mais desafiadores, os projetistas precisam de ferramentas que permitam unir tecnologias e conhecimentos de áreas distintas de forma eficiente. Nesse contexto, há uma demanda para a construção de sistemas que aumentem o nível de abstração da modelagem de projetos para o processamento de imagens em sistemas embarcados e assim, possibilitando uma melhor exploração do espaço de projetos. A fim de contribuir para minimizar este problema, este trabalho de pesquisa demonstra o desenvolvimento de um framework para coprojeto de hardware e software específico para a construção de sistemas ADAS que utilizam visão computacional. O Framework visa facilitar o desenvolvimento dessas aplicações permitindo a exploração o espaço de projeto (DSE - Design Space Exploration), e assim contribuindo para um ganho de desempenho no desenvolvimento de sistemas embarcados quando comparados à construção totalmente de um modo manual. Uma das características deste projeto é a possibilidade da simulação da aplicação antes da síntese em um sistema reconfigurável. Os principais desafios deste sistema foram relacionados à construção do sistema de intercomunicação entre os diversos blocos de Propriedade Intelectual (IP) e os componentes de software, abstraindo do usuário final inúmeros detalhes de hardware, tais como gerenciamento de memória, interrupções, cache, tipos de dados (ponto flutuante, ponto fixo, inteiros) e etc, possibilitando um sistema mais amigável ao projetista.<br>The demand for new technologies, enhanced security and comfort for urban cars has grown considerably in recent years prompting the industry to create systems designed to support drivers (ADAS - Advanced Driver Assistance Systems). This fact contributed to the development of many embedded systems in the automotive area among them, the pedestrians collision avoidance. Through the advancement in various research, began circulating through the streets vehicles with anti-collision systems and autonomous navigation. However, to achieve ever more challenging goals, designers need tools to unite technology and expertise from different areas efficiently. In this context, there is a demand for building systems that increase the level of abstraction of models of image processing for use in embedded systems enabling better design space exploration. To help minimize this problem, this research demonstrates a develop a specific framework for hardware/software codesign to build ADAS systems using computer vision. The framework aims to facilitate the development of applications, allowing better explore the design space, and thus contribute to a performance gain in the development of embedded systems in relation to building entirely in hardware. One of the requirements of the project is the possibility of the simulation of an application before synthesis on a reconfigurable system. The main challenges of this system were related to the construction of the intercommunication system between the various Intellectual Property (IP) blocks and the software components, abstracting from the end user numerous hardware details, such as memory management, interruptions, cache, types (Floating point, fixed point, integers) and so on, enabling a more user-friendly system for the designer.
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Joubert, Damien. "Conception pour le véhicule autonome et les applications ADAS sécuritaires d'un système vidéo ADAS coopératif à base de rétines CMOS." Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC045.
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La perception monoculaire par caméra est un problème loin d’être résolu, qui oppose de nombreux acteurs et qui malgré des investissements massifs n’a toujours pas le niveau de performance requis pour les applications de conduite autonome. Si certaines fonctionnalités d’aides à la conduite laissent penser que l’attention du conducteur peut être réduite, ce n’est pas le cas en pratique car la question de la responsabilité repose encore sur les épaules du conducteur. Ce travail a pour objectif de construire une solution de vision frontale robuste, combinant plusieurs modalités, à travers l’utilisation d’un seul et même capteur. L’imageur retenu ici est la rétine CMOS, ou l’imageur événementiel, dont les pixels sont capables de détecter et d’horodater des changements relatifs de luminance, positifs ou négatifs. La fréquence d’acquisition des données est ainsi rythmée par la cinématique du scénario, qui peut être importante dans les scènes automobiles. Les deux modalités extraites du capteur sont d’un coté l’utilisation d’algorithmes conventionnels de traitement d’image, et de l’autre la détection de signaux modulés à haute fréquence émis par les cibles, et caractérisant également l’état ou l’orientation de l’objet. Il est d’abord question dans ce travail de mesurer les paramètres des rétines CMOS, pour d’une part les simuler et de l’autre évaluer leurs variations face à la dynamique de l’environnement des scénarios automobiles. Cette étape s’articule autour de la mise en place d’un banc de caractérisation et d’un modèle de simulation du capteur capable de faire le lien avec les mesures réalisées sur banc. Ce dernier permet également de quantifier les performances des algorithmes de détection des signaux modulés développés, pour permettre de s’assurer que chaque détection correspond bien au signal recherché, et permet aussi d’optimiser la réponse du capteur face aux signaux coopératifs. La détection de ces signaux est démontrée par simulation et sur prototype, avec une portée supérieure à 150 mètres et une fréquence de modulation de 5 kHz. Les algorithmes proposés permettent de conserver un flux de données totalement asynchrone. Les verrous technologiques des rétines CMOS ont été identifiés pour cette fonction, et une attention particulière pourra être portée aux prochaines générations de ces capteurs. En parallèle, une méthode de détection et de classification de cible à base de réseaux de neurones convolutifs est mise en place. Elle consiste à créer des images artificielles en intégrant les événements au cours du temps, et d’opérer un transfert d’apprentissage avec une architecture entraı̂née sur des images conventionnelles, rendu possible en adaptant les méthodes d’entraı̂nement pour éviter le sur-apprentissage. Ce réseau permet ensuite d’initialiser les fonctions de suivi pour estimer le temps avant collision. Cette étape tire parti de la nature asynchrone des événements, en estimant le déplacement d’un objet dans le plan focal de manière événementielle via l’évaluation du flot optique local. Le modèle de simulation du capteur permet par ailleurs d’estimer les algorithmes testés et proposés face aux variation des paramètres de bruit et de latence du capteur. Un dispositif de test sur piste permet de montrer que le suivi événementiel est plus précis que le suivi basé sur les détections synchrones des cibles. Enfin, des pistes de fusion entre les deux modalités ont été testées,et montrent que l’apport de la détection des signaux modulés sur le positionnement de la cible correspondante est complexe à implémenter sans s’appuyer sur le contenu de l’image. En revanche, le suivi du mouvement basé sur les détections de signaux coopératifs permet dans certains cas de filtrer la densité de la scène, ce qui améliore les performances de suivi. (...)<br>The perception by monocular vision is an issue not solved yet. While a competition exists between many companies and huge investments were raised, the expected level of performance to autonomous driving is still not reached. Even if some advanced driving assistance systems functionalities make the driver believe that he can be less focused, it is not the case in practice and the responsibility is still based on its shoulder. This work aims at building a robust front vision system combining two modalities, thanks to the use of an artificial CMOS retina, or an event-based sensor, whose pixels can detect and timestamp positive or negative relative changes of illuminance. The frequency of data acquisition depends on the kinetic of the scene which could vary a lot in automotive scenarios. The two modalities extracted from the sensor are on one side conventional image processing algorithms, and on the other side the detection of light signals emitted by targets, modulated with high frequencies and characterizing the state or the orientation of the object. This work firstly aims at measuring CMOS retinas parameters, in order to design a simulation model and also to determine how the parameters evolve when facing automotive constraints. This step is articulated around the design of a characterization setup and the implementation of a sensor modelusing the measurements realized on the characterization setup. This latter also enables to quantify the performances achieved by the algorithms which detect modulated light signals, to check that each detection corresponds to the good cooperative signal and enable to optimize the sensor’s response to the range of frequencies used. The detection is demonstrated on simulation experiments and on a prototype, with a scope of 150 meters using a frequency equal to 5 kHz. The algorithms proposed in this work allow to keep the asynchronous characteristic of the data stream. The limitations of the technology have been identified to realize signal’s detection, and an attention can be provided to the next generations of CMOS retinas. In parallel, a detection and classification method based on convolutional neural networks is implemented. It consists of the creation of artificial images by integrating events over time, and to apply a transfer learning technique with a network trained on conventional images, made possible using dedicated data augmentation strategies to avoid overlearning. This network is then used to initialized tracking functions to determine the time to collision. This step uses the asynchronous advantage of event-based data, byestimating the movement locally through the computation of the optical flow. The simulation model of the sensor allows to test some algorithms and to evaluate the performance as a function of sensor’s parameters like the latency or the background noise. A prototype is set on test tracks to demonstrate that event-based tracking is much more efficient than image-based tracking. Finally, some attempts are tested to fuse the two modalities, and illustrate that the positioning of the target emitting the cooperative signal is complicated to manage without using the content of the conventional image. However, the classification and the tracking of the objects is improved in some cases thanks to the cooperative signal, which removes the density of a scene to be more focused on targets. This work, between sensors and algorithms, demonstrate how a cooperative vision system can be inserted into the perception function of autonomous vehicles to guarantee an optimal level of performances
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Jeon, Dae Kyung. "Methodologies for developing distributed systems in Ada with a simulation of a distributed Ada system." Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/722459.
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In recent years, the field of distributed processing, distributed systems, has undergone great change, and has been an area attracting tremendous research and development efforts. This thesis explores the various current methodologies for designing, developing and implementing distributed systems using the Ada programming language, and goes on to implement a simulation of a distributed store system using the "virtual node" design approach. After a brief introduction on distributed systems in general, an investigation of the basic issues and problems involved in distributing Ada programs coupled with an analysis and comparison of various approaches to developing distributed Ada systems is carried out. It is shown that one of the critical problems of Ada in a distributed environment is its implicit assumption of a single memory processor. A simulation of a distributed system (store system) is carried out using the virtual node method of developing distributed Ada systems. The various stages of this design method including interface task specification are stepped through. A sample run of the. system is given, including the customer file, stock file data and the monitored output of the system.<br>Department of Computer Science
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Aziz, Tabinda. "Empirical Analyses of Human-Machine Interactions focusing on Driver and Advanced Driver Assistance Systems." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/195975.
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Bareiss, Max. "Effectiveness of Intersection Advanced Driver Assistance Systems in Preventing Crashes and Injuries in Left Turn Across Path / Opposite Direction Crashes in the United States." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/96570.
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Intersection crashes represent one-fifth of all police reported traffic crashes and one-sixth of all fatal crashes in the United States each year. Active safety systems have the potential to reduce crashes and injuries across all crash modes by partially or fully controlling the vehicle in the event that a crash is imminent. The objective of this thesis was to evaluate crash and injury reduction in a future United States fleet equipped with intersection advanced driver assistance systems (I-ADAS). In order to evaluate this, injury risk modeling was performed. The dataset used to evaluate injury risk was the National Automotive Sampling System / Crashworthiness Data System (NASS/CDS). An injured occupant was defined as vehicle occupant who experienced an injury of maximum Abbreviated Injury Scale (AIS) of 2 or greater, or who were fatally injured. This was referred to as MAIS2+F injury. Cases were selected in which front-row occupants of late-model vehicles were exposed to a frontal, near-, or far-side crash.
Logistic regression was used to develop an injury model with occupant, vehicle, and crash parameters as predictor variables. For the frontal and near-side impact models, New Car Assessment Program (NCAP) test results were used as a predictor variable. This work quantitatively described the injury risk for a wide variety of crash modes, informing effectiveness estimates.
This work reconstructed 501 vehicle-to-vehicle left turn across path / opposite direction (LTAP/OD) crashes in the United States which had been originally investigated in NMVCCS. The performance of thirty different I-ADAS system variations was evaluated for each crash. These variations were the combinations of five Time to Collision (TTC) activation thresholds, three latency times, and two different intervention types (automated braking and driver warning). In addition, two sightline assumptions were modeled for each crash: one where the turning vehicle was visible long before the intersection, and one where the turning vehicle was only visible after entering the intersection. For resimulated crashes which were not avoided by I-ADAS, a new crash delta-v was computed for each vehicle. The probability of MAIS2+F injury to each front row occupant was computed.
Depending on the system design, sightline assumption, I-ADAS variation, and fleet penetration, an I-ADAS system that automatically applies emergency braking could avoid 18%-84% of all LTAP/OD crashes. An I-ADAS system which applies emergency braking could prevent 44%-94% of front row occupants from receiving MAIS2+F injuries. I-ADAS crash and injured person reduction effectiveness was higher when both vehicles were equipped with I-ADAS. This study presented the simulated effectiveness of a hypothetical intersection active safety system on real crashes which occurred in the United States, showing strong potential for these systems to reduce crashes and injuries.
However, this crash and injury reduction effectiveness made the idealized assumption of full installation in all vehicles of a future fleet. In order to evaluate I-ADAS effectiveness in the United States fleet the proportion of new vehicles with I-ADAS was modeled using Highway Loss Data Institute (HLDI) fleet penetration predictions. The number of potential LTAP/OD conflicts was modeled as increasing year over year due to a predicted increase in Vehicle Miles Traveled (VMT). Finally, the combined effect of these changes was used to predict the number of LTAP/OD crashes each year from 2019 to 2060. In 2060, we predicted 70,439 NMVCCS-type LTAP/OD crashes would occur. The predicted number of MAIS2+F injured front row occupants in 2060 was 3,836. This analysis shows that even in the long-term fleet penetration of Intersection Active Safety Systems, many injuries will continue to occur. This underscores the importance of maintaining passive safety performance in future vehicles.<br>M.S.<br>Future vehicles will have electronic systems that can avoid crashes in some cases where a human driver is unable, unaware, or reacts insufficiently to avoid the crash without assistance. The objective of this work was to determine, on a national scale, how many crashes and injuries could be avoided due to Intersection Advanced Driver Assistance Systems (I-ADAS), a hypothetical version of one of these up-and-coming systems. This work focused on crashes where one car is turning left at an intersection and the other car is driving through the intersection and not turning. The I-ADAS system has sensors which continuously search for other vehicles. When the I-ADAS system determines that a crash may happen, it applies the brakes or otherwise alerts the driver to apply the brakes. Rather than conduct actual crash tests, this was simulated on a computer for a large number of variations of the I-ADAS system. The basis for the simulations was real crashes that happened from 2005 to 2007 across the United States. The variations that were simulated changed the time at which the I-ADAS system triggered the brakes (or alert) and the simulated amount of computer time required for the I-ADAS system to make a choice. In some turning crashes, the car cannot see the other vehicle because of obstructions, such as a line of people waiting to turn left across the road. Because of this, simulations were conducted both with and without the visual obstruction. For comparison, we performed a simulation of the original crash as it happened in real life. Finally, since there are two cars in each crash, there are simulations when either car has the I-ADAS system or when both cars have the I-ADAS system. Each simulation either ends in a crash or not, and these are tallied up for each system variation. The number of crashes avoided compared to the number of simulations run is crash effectiveness. Crash effectiveness ranged from 1% to 84% based on the system variation. For each crash that occurred, there is another simulation of the time immediately after impact to determine how severe the impact was. This is used to determine how many injuries are avoided, because often the crashes which still happened were made less severe by the I-ADAS system.
In order to determine how many injuries can be avoided by making the crash less severe, the first chapter focuses on injury modeling. This analysis was based on crashes from 2008 to 2015 which were severe enough that one of the vehicles was towed. This was then filtered down by only looking at crashes where the front or sides were damaged. Then, we compared the outcome (injury as reported by the hospital) to the circumstances (crash severity, age, gender, seat belt use, and others) to develop an estimate for how each of these crash circumstances affected the injury experienced by each driver and front row passenger. A second goal for this chapter was to evaluate whether federal government crash ratings, commonly referred to as “star ratings”, are related to whether the driver and passengers are injured or not. In frontal crashes (where a vehicle hits something going forwards), the star rating does not seem to be related to the injury outcome. In near-side crashes (the side next to the occupant is hit), a higher star rating is better. For frontal crashes, the government test is more extreme than all but a few crashes observed in real life, and this might be why the injury outcomes measured in this study are not related to frontal star rating.
Finally, these crash and injury effectiveness values will only ever be achieved if every car has an I-ADAS system. The objective of the third chapter was to evaluate how the crash and injury effectiveness numbers change each year as new cars are purchased and older cars are scrapped. Early on, few cars will have I-ADAS and crashes and injuries will likely still occur at roughly the rate they would without the system. This means that crashes and injuries will continue to increase each year because the United States drives more miles each year. Eventually, as consumers buy new cars and replace older ones, left turn intersection crashes and injuries are predicted to be reduced. Long into the future (around 2050), the increase in crashes caused by miles driven each year outpaces the gains due to new cars with the I-ADAS system, since almost all of the old cars without I-ADAS have been removed from the fleet. In 2025, there will be 173,075 crashes and 15,949 injured persons that could be affected by the I-ADAS system. By 2060, many vehicles will have I-ADAS and there will be 70,439 crashes and 3,836 injuries remaining. Real cars will not have a system identical to the hypothetical I-ADAS system studied here, but systems like it have the potential to significantly reduce crashes and injuries.
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Sullivan, James A. "Management of autonomous systems in the Navy's Automated Digital Network System (ADNS)." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA341474.
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Thesis (M.S. in Information Technology Management) Naval Postgraduate School, September 1997.<br>"September 1997." Thesis advisor(s): Rex Buddenberg, Suresh Sridhar. Includes bibliographical references (p. 83-84). Also available online.
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Dekkiche, Djamila. "Programming methodologies for ADAS applications in parallel heterogeneous architectures." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS388/document.
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La vision par ordinateur est primordiale pour la compréhension et l’analyse d’une scène routière afin de construire des systèmes d’aide à la conduite (ADAS) plus intelligents. Cependant, l’implémentation de ces systèmes dans un réel environnement automobile et loin d’être simple. En effet, ces applications nécessitent une haute performance de calcul en plus d’une précision algorithmique. Pour répondre à ces exigences, de nouvelles architectures hétérogènes sont apparues. Elles sont composées de plusieurs unités de traitement avec différentes technologies de calcul parallèle: GPU, accélérateurs dédiés, etc. Pour mieux exploiter les performances de ces architectures, différents langages sont nécessaires en fonction du modèle d’exécution parallèle. Dans cette thèse, nous étudions diverses méthodologies de programmation parallèle. Nous utilisons une étude de cas complexe basée sur la stéréo-vision. Nous présentons les caractéristiques et les limites de chaque approche. Nous évaluons ensuite les outils employés principalement en terme de performances de calcul et de difficulté de programmation. Le retour de ce travail de recherche est crucial pour le développement de futurs algorithmes de traitement d’images en adéquation avec les architectures parallèles avec un meilleur compromis entre les performances de calcul, la précision algorithmique et la difficulté de programmation<br>Computer Vision (CV) is crucial for understanding and analyzing the driving scene to build more intelligent Advanced Driver Assistance Systems (ADAS). However, implementing CV-based ADAS in a real automotive environment is not straightforward. Indeed, CV algorithms combine the challenges of high computing performance and algorithm accuracy. To respond to these requirements, new heterogeneous circuits are developed. They consist of several processing units with different parallel computing technologies as GPU, dedicated accelerators, etc. To better exploit the performances of such architectures, different languages are required depending on the underlying parallel execution model. In this work, we investigate various parallel programming methodologies based on a complex case study of stereo vision. We introduce the relevant features and limitations of each approach. We evaluate the employed programming tools mainly in terms of computation performances and programming productivity. The feedback of this research is crucial for the development of future CV algorithms in adequacy with parallel architectures with a best compromise between computing performance, algorithm accuracy and programming efforts
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Tang, Zongzhi. "A Novel Road Marking Detection and Recognition Technique Using a Camera-based Advanced Driver Assistance System." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35729.
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Advanced Driver Assistance System (ADAS) was widely learned nowadays. As crucial parts of ADAS, lane markings detection, as well as other objects detection, have become more popular than before. However, most methods implemented in such areas cannot perfectly balance the performance of accuracy versus efficiency, and the mainstream methods (e.g. Machine Learning) suffer from several limitations which can hardly break the wall between partial autonomous and fully autonomous driving. This thesis proposed a real-time lane marking detection framework for ADAS, which included 4-extreme points set descriptor and a rule-based cascade classifier. By analyzing the behavior of lane markings on the road surface, a characteristic of markings was discovered, i.e., standard markings can sustain their shape in the perpendicular plane of the driving direction. By employing this feature, a 4-extreme points set descriptor was applied to describe the shape of each marking first. Specifically, after processing Maximally Stable Extremal Region (MSER) and Hough transforms on a 2-D image, several contours of interest are obtained. A bounding box, with borders parallel to the image coordinate, intersected with each contour at 4 points in the edge, which was named 4-extreme points set. Afterward, to verify consistency of each contour and standard marking, some rules abstracted from construction manual are employed such as Area Filter, Colour Filter, Relative Location Filter, Convex Filter, etc.
To reduce the errors caused by changes in driving direction, an enhanced module was then introduced. By tracking the vanishing point as well as other key points of the road net, a method for 3-D reconstruction, with respect to the optical axis between vanishing point and camera center, is possible. The principle of such algorithm was exhibited, and a description about how to obtain the depth information from this model was also provided. Among all of these processes, a key-point based classification method is the main contribution of this paper because of its function in eliminating the deformation of the object caused by inverse perspective mapping.
Several experiments were conducted in highway and urban roads in Ottawa. The detection rate of the markings by the proposed algorithm reached an average accuracy rate of 96.77% while F1 Score (harmonic mean of precision and recall) also attained a rate of 90.57%. In summary, the proposed method exhibited a state-of-the-art performance and represents a significant advancement of understanding.
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Mattsson, David. "ADAS : A simulation study comparing two safety improving Advanced Driver Assistance Systems." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-85151.
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Driving is a high-risk adventure which many enjoy on a daily basis. The driving task is highly complex, ever-changing, and one which requires continuous attention and rapid decision making. It is a task that is not without risk, where the cost to reach the desired destination can be too great – your life could be at stake. Driving is not without incidents. Rear-end collision is a common problem in the Swedish traffic environment, with over 100 police-reported individual incidents per year. The amount of rear-end collisions can be hypothetically reduced by introducing new technology in the driver’s vehicle, technology which attempts to improve the driver’s safety driving. This technology is called Advanced Driver Assistance Systems – ADAS. In this study two ADAS were evaluated in a driving simulator study: An Adaptive Cruise Control (ACC) which operates on both hazardous and non-hazardous events, and a Collision Warning System (CWS) which operates solely on non-hazardous events. Both of these ADAS function to guard against risky driving and are based on the assumption that drivers will not act in such a manner that they would willingly reduce the effectiveness of the system. A within-subjects simulation study was conducted where participants drove under three conditions: 1) with an adaptive cruise controller, 2) a frontal rear-end collision warning system ADAS, and 3) unaided, in order to investigate differences between the three driving conditions. Particular focus was on whether the two ADAS improved driving safety. The study results indicate that driving enhanced by the two ADAS made the participating drivers drive less safely.
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Szoltys, Kryštof. "Parametrické CAD systémy a databáze součástí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217957.
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Autodesk Inventor is a full 3D CAD system. This system includes tools for working environment tool, component design tool including information data management and technical support. The target of the first part is to describe the most important new features brought by Autodesk Inventoru 2009 version. In of next chapters the work describes creation common iPart, which is basically different variants set (proportions, material …) of one entity, and preparation before correct publication to the content center, which is a virtual database of all iPart. Also there is presented how to create the content center, how to work with it and adjust data. The aim of work is then the creation database a stator and a rotor packet for the firm ATAS electromotor Náchod Inc. In the thesis there is described creation of the lamination as an iPart and their publication to the new content center.
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Johnson, Gary G. "ADVANCED DATA ACQUISITION AND PROCESSING SYSTEMS (ADAPS)." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/608909.
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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California<br>Flight testing has dramatically changed from the freewheeling “right-stuff” aviation days of
the 40s and 50s. The computer age was just beginning. There was essentially no access to
data other than voice and radar tracking information on the ground to monitor the flights.
The advent of reliable and effective ground systems for real-time safety monitoring was
still in the future. Unfortunately, the lack of these systems played a contributing role in the
large number of accidents which killed or injured a significant number of our nation’s
pioneer test pilots.
As technology evolved, more real-time access to critical safety and performance
parameters became available to our flight test engineers on the ground. This technology
included sophisticated aircraft instrumentation of key measurements, improved telemetry
transmission and reception, and finally, enhanced real-time processing and display of the
test data to the engineers. One advantage achieved through these technological advances in
testing was a tremendous improvement in flight safety. Although accidents can still
happen, today they are very rare thanks, in part, to the ability to accurately monitor and
control a test program on the ground.
The Advanced Data Acquisition and Processing Systems (ADAPS) program is specifically
tailored to meet the needs of test engineers on the ground at the Air Force Flight Test
Center (AFFTC) Edwards AFB, California, to monitor a flight through the use of state-of-the-art data acquisition, processing, and display technologies. This paper provides an
overall perspective of the requirements for data processing which ADAPS addresses. In
addition, the ADAPS design concept, architecture, and development plan are discussed.
The purpose is to describe how the ADAPS development effort meets the flight test end
user needs of the 1990s. The paper concludes with a section on how we can apply the
ADAPS concepts and technology to help equip the multiple Department of Defense (DoD)
test centers with a common test data processing capability.
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Gaszczak, Anna. "Vision based environment perception system for next generation off-road ADAS : innovation report." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/97618/.
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Advanced Driver Assistance Systems (ADAS) aids the driver by providing information or automating the driving related tasks to improve driver comfort, reduce workload and improve safety. The vehicle senses its external environment using sensors, building a representation of the world used by the control systems. In on-road applications, the perception focuses on establishing the location of other road participants such as vehicles and pedestrians and identifying the road trajectory. Perception in the off-road environment is more complex, as the structure found in urban environments is absent. Off-road perception deals with the estimation of surface topography and surface type, which are the factors that will affect vehicle behaviour in unstructured environments. Off-road perception has seldom been explored in automotive context. For autonomous off-road driving, the perception solutions are primarily related to robotics and not directly applicable in the ADAS domain due to the different goals of unmanned autonomous systems, their complexity and the cost of employed sensors. Such applications consider only the impact of the terrain on the vehicle safety and progress but do not account for the driver comfort and assistance. This work addresses the problem of processing vision sensor data to extract the required information about the terrain. The main focus of this work is on the perception task with the constraints of automotive sensors and the requirements of the ADAS systems. By providing a semantic representation of the off-road environment including terrain attributes such as terrain type, description of the terrain topography and surface roughness, the perception system can cater for the requirements of the next generation of off-road ADAS proposed by Land Rover. Firstly, a novel and computationally efficient terrain recognition method was developed. The method facilitates recognition of low friction grass surfaces in real-time with high accuracy, by applying machine learning Support Vector Machine with illumination invariant normalised RGB colour descriptors. The proposed method was analysed and its performance was evaluated experimentally in off-road environments. Terrain recognition performance was evaluated on a variety of different surface types including grass, gravel and tarmac, showing high grass detection performance with accuracy of 97%. Secondly, a terrain geometry identification method was proposed which facilitates semantic representation of the terrain in terms of macro terrain features such as slopes, crest and ditches. The terrain geometry identification method processes 3D information reconstructed from stereo imagery and constructs a compact grid representation of the surface topography. This representation is further processed to extract object representation of slopes, ditches and crests. Thirdly, a novel method for surface roughness identification was proposed. The surface roughness descriptor is then further used to recommend a vehicle velocity, which will maintain passenger comfort. Surface roughness is described by the Power Spectral Density of the surface profile which correlates with the acceleration experienced by the vehicle. The surface roughness descriptor is then mapped onto vehicle speed recommendation so that the speed of the vehicle can be adapted in anticipation of the surface roughness. Terrain geometry and surface roughness identification performance were evaluated on a range of off-road courses with varying topology showing the capability of the system to correctly identify terrain features up to 20 m ahead of the vehicle and analyse surface roughness up to 15 m ahead of the vehicle. The speed was recommended correctly within +/- 5 kph. Further, the impact of the perception system on the speed adaptation was evaluated, showing the improvements in speed adaptation allowing for greater passenger comfort. The developed perception components facilitated the development of new off-road ADAS systems and were successfully applied in prototype vehicles. The proposed off-road ADAS are planned to be introduced in future generations of Land Rover products. The benefits of this research also included new Intellectual Property generated for Jaguar Land Rover. In the wider context, the enhanced off-road perception capability may facilitate further development of off-road automated driving and off-road autonomy within the constraints of the automotive platform.
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Nassar, Diaa Eldin M. "A prototype automatic dental identification system (ADIS)." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1977.
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Thesis (M.S.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains v, 72 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 70-72).
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Thomas, Robert J. Jr. "Design and implementation of an airborne data collection system with application to precision landing systems (ADCS)." Ohio University / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176237925.
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Gavrilovich, Irina. "Développement d'un système robotique pour des essais au sol du système de contrôle d'attitude et d'orbite d'un CubeSat." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT329/document.
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Après le lancement du premier satellite artificiel en 1957, l'évolution de diverses technologies a favorisé la miniaturisation des satellites. En 1999, le développement des nano-satellites modulaires appelés CubeSats, qui ont la forme d'un cube d'un décimètre de côté et une masse de 1 kg à 10 kg, a été initié par un effort commun de l'Université polytechnique de Californie et de l'Université de Stanford. Depuis lors, grâce à l’utilisation de composants électroniques standards à faible coût, les CubeSats se sont largement répandus.Au cours des dernières années, le nombre de CubeSats lancés a régulièrement augmenté, mais moins de la moitié des missions ont atteint leurs objectifs. L'analyse des défaillances des CubeSats montre que la cause la plus évidente est le manque d’essais adéquats des composants du système ou du système au complet. Parmi les tâches particulièrement difficiles, on compte les essais « hardware-in-the-loop » (HIL) du système de contrôle d'attitude et d'orbite (SCAO) d’un CubeSat. Un système dédié à ces essais doit permettre des simulations fiables de l'environnement spatial et des mouvements réalistes des CubeSats. La façon la plus appropriée d’obtenir de telles conditions d’essai repose sur l’utilisation d’un coussin d'air. Toutefois, les mouvements du satellite sont alors contraints par les limites géométriques, qui sont inhérentes aux coussins d'air. De plus, après 15 années de développements de CubeSats, la liste des systèmes proposés pour tester leur SCAO reste très limitée.Aussi, cette thèse est consacrée à l’étude et à la conception d’un système robotique innovant pour des essais HIL du SCAO d’un CubeSat. La nouveauté principale du système d'essai proposé est l’usage de quatre coussins d'air au lieu d'un seul et l’emploi d’un robot manipulateur. Ce système doit permettre des mouvements non contraints du CubeSat. Outre la conception du système d'essai, cette thèse porte sur les questions liées: (i) à la détermination de l'orientation d’un CubeSat au moyen de mesures sans contact; (ii) au comportement de l’assemblage des coussins d'air; (iii) à l'équilibrage des masses du système.Afin de vérifier la faisabilité de la conception proposée, un prototype du système d'essai a été développé et testé. Plusieurs modifications destinées à en simplifier la structure et à réduire le temps de fabrication ont été effectuées. Un robot Adept Viper s650 est notamment utilisé à la place d'un mécanisme sphérique spécifiquement conçu. Une stratégie de commande est proposée dans le but d’assurer un mouvement adéquat du robot qui doit suivre les rotations du CubeSat. Finalement, les résultats obtenus sont présentés et une évaluation globale du système d'essai est discutée<br>After the launch of the first artificial Earth satellite in 1957, the evolution of various technologies has fostered the miniaturization of satellites. In 1999, the development of standardized modular satellites with masses limited to a few kilograms, called CubeSats, was initiated by a joint effort of California Polytechnic State University and Stanford University. Since then, CubeSats became a widespread and significant trend, due to a number of available off-the-shelf low cost components.In last years, the number of launched CubeSats constantly grows, but less than half of all CubeSat missions achieved their goals (either partly or completely). The analysis of these failures shows that the most evident cause is a lack of proper component-level and system-level CubeSat testing. An especially challenging task is Hardware-In-the-Loop (HIL) tests of the Attitude Determination and Control System (ADCS). A system devoted to these tests shall offer reliable simulations of the space environment and allow realistic CubeSat motions. The most relevant approach to provide a satellite with such test conditions consists in using air bearing platforms. However, the possible satellite motions are strictly constrained because of geometrical limitations, which are inherent in the air bearing platforms. Despite 15 years of CubeSat history, the list of the air bearing platforms suitable for CubeSat ADCS test is very limited.This thesis is devoted to the design and development of an air bearing testbed for CubeSat ADCS HIL testing. The main novelty of the proposed testbed design consists in using four air bearings instead of one and in utilizing a robotic arm, which allows potentially unconstrained CubeSat motions. Besides the testbed design principle, this thesis deals with the related issues of the determination of the CubeSat orientation by means of contactless measurements, and of the behavior of the air bearings, as well as with the need of a mass balancing method.In order to verify the feasibility of the proposed design, a prototype of the testbed is developed and tested. Several modifications aimed at simplifying the structure and at shortening the fabrication timeline have been made. For this reason, the Adept Viper s650 robot is involved in place of a custom-designed 4DoF robotic arm. A control strategy is proposed in order to provide the robot with a proper motion to follow the CubeSat orientation. Finally, the obtained results are presented and the overall assessment of the proposed testbed is put into perspective
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Qiu, Jiaheng. "Performance Analysis and System Modelling of Ethernet-based In Vehicle Communication." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207060.
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While vehicle technology is rapidly advanced, advanced driver assistance system (ADAS) stays in focus. However, all of these growing automotive applications are driving up the bandwidth requirements, therefore vehicle networks require higher bandwidth and more deterministic real-time guarantees than before.Switched Ethernet is widely used for all kinds of applications, and it gradually moves into the automotive domain. The new specification of the IEEE 802.1 Audio/Video Bridging (AVB) standard provides the QoS features needed for ADAS data streaming.In this work, we study and analyse Ethernet-based invehicle communication of both legacy Ethernet and AVB Ethernet through a simulation approach to verify the automotive network performance. Furthermore, a system engineering approach is used to achieve a more model-based design of simulation and developing prototypes in the future.<br>Samtidigt som fordonsteknologin ökar snabbt, är det system för avancerad förarassistans (advanced driver assistance systems, ADAS) som står i fokus. Dessa ökande fordonsapplikationer driver på bandbreddskraven, och därför kräver fordonsnätverken högre bandbredd och mer determinisktiska realtidskrav än tidigare.Switchat nätverk (Switched Ethernet) används i alla möjliga applikationer och flyttar gradvis in i fordonsdomänen. Den nya specificationen av standarden IEEE 802.1 Audio/Video Bridging (AVB) tillhandahåller QoS (Quality of Service) funktioner för ADAS dataöverföring.I den här avhandlingen undersöks och analyseras Ethernetbaserad fordonskommunikation av både vanligt nätverk (Ethernet) och AVB Ethernet genom simulering för att verifiera nätverksprestandan för fordonsnätverket i fråga. En systemingenjörsinriktning har använts för att skapa en mer modell-baserad design av simuleringen, som även kan användas för att utveckla prototyper i framtiden.
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Cebik, James A., and William J. Connor. "AIRBORNE DATA ACQUISITION SYSTEM FOR THE RAH-66 COMANCHE AIRCRAFT." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609828.
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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>The RAH-66 Comanche flight test program required a state of the art Airborne Data Acquisition System consisting of: 1) A modular distributed system that uses a series of software programmable building blocks capable of signal conditioning all types of sensors. 2) A digital multiplexing system capable of combining various types of digital streams at high rates including Synchronous and Asynchronous PCM, MIL-STD-1553B, and RS-422 data streams. 3) A Data Combiner Unit that accepts synchronous PCM data streams from one to eight sources at 4 MBPS or less and a frame size of up to 8128 words each that outputs four independent PCM streams at 8 MBPS or less and a frame size of up to 16384 words. 4) A Data System Control Unit that controls the tape recorder, serves as the interface to the Pilot’s Control Unit and monitors/reports status of the data acquisition system to the Pilots Control Unit. 5) An Airborne Computer that provides the control and interface to the pilot & copilot instrumentation displays. 6) A Cockpit Instrumentation Pilot Display System consisting of a Main Unit Multi- Function Display, a Load Factor/Hub Moment Display and a Right Wing Flight Control Position Display. The Main Unit Multi-Function Display has the capability to display multiple graphic pages generated by the Airborne Computer. 7) The ability to record high speed avionics buses from the (Mission Equipment Package) MEP such as MIL-STD-1553B, (High Speed Data Bus) HSDB, (Processor Interconnect) PI Bus, (Data Flow Network) DFN and PCM utilizing the Ampex DCRsi-107 Tape Recorder.
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DeLooze, Lori L. "ITS Ada : an intelligent tutoring system for the Ada programming language." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28322.
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Meijer, Max Jan. "Exploring Augmented Reality for enhancing ADAS and Remote Driving through 5G : Study of applying augmented reality to improve safety in ADAS and remote driving use cases." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277857.
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This thesis consists of two projects focusing on how 5G can be used to make vehicles safer. The first project focuses on conceptualizing near-future use cases of how Advanced Driver Assistance Systems (ADAS) can be enhanced through 5G technology. Four concepts were developed in collaboration with various industry partners. These concepts were successfully demonstrated in a proof-of-concept at the 5G Automotive Association (5GAA) “The 5G Path of Vehicle-to-Everything Communication: From Local to Global” conference in Turin, Italy. This proof-of-concept was the world’s first demonstration of such a system. The second project focuses on a futuristic use case, namely remote operation of semi-autonomous vehicles (sAVs). As part of this work, it was explored if augmented reality (AR) can be used to warn remote operators of dangerous events. It was explored if such augmentations can be used to compensate during critical events. These events are defined as occurrences in which the network conditions are suboptimal, and information provided to the operator is limited. To evaluate this, a simulator environment was developed that uses eye- tracking technology to study the impact of such scenarios through user studies. The simulator establishes an extendable platform for future work. Through experiments, it was found that AR can be beneficial in spotting danger. However, it can also be used to directly affect the scanning patterns at which the operator views the scene and directly affect their visual scanning behavior.<br>Denna avhandling består av två projekt med fokus på hur 5G kan användas för att göra fordon säkrare. Det första projektet fokuserar på att konceptualisera användningsfall i närmaste framtid av hur Advanced Driver Assistance Systems (ADAS) kan förbättras genom 5G-teknik. Fyra koncept utvecklades i samarbete med olika branschpartner. Dessa koncept demonstrerade i ett proof-of- concept på 5G Automotive Association (5GAA) “5G Path of Vehicle to to Everything Communication: From Local to Global” -konferensen i Turin, Italien. Detta bevis-of-concept var världens första demonstration av ett sådant system. Det andra projektet fokuserar på ett långt futuristiskt användningsfall, nämligen fjärrstyrning av semi-autonoma fordon (sAVs). Som en del av detta arbete undersöktes det om augmented reality (AR) kan användas för att varna fjärroperatörer om farliga händelser. Det undersöktes om sådana förstärkningar kan användas för att kompensera under kritiska händelser. Dessa händelser definieras som händelser där nätverksförhållandena är suboptimala och information som tillhandahålls till operatören är begränsad. För att utvärdera detta utvecklades en simulatormiljö som använder ögonspårningsteknologi för att studera effekterna av sådana scenarier genom en användarstudie. Simulatorn bildar en utdragbar plattform för framtida arbete. Genom experiment fann man att AR kan vara fördelaktigt när det gäller att upptäcka fara. Men det kan också användas för att direkt påverka skanningsmönstret där operatören tittar på scenen och direkt påverka deras visuella skanningsbeteende.
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Hines, Dennis O., Donald C. Rhea, and Guy W. Williams. "ADVANCED DATA ACQUISITION AND PROCESSING SYSTEMS (ADAPS) UPDATE." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/608546.
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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California<br>The rapid technology growth in the aerospace industry continues to manifest itself in
increasingly complex computer systems and weapons systems platforms. To meet the
data processing challenges associated with these new weapons systems, the Air Force
Flight Test Center (AFFTC) is developing the next generation of data acquisition and
processing systems under the Advanced Data Acquisition and Processing Systems
(ADAPS) Program. The ADAPS program has evolved into an approach that utilizes
Commercial-Off-The-Shelf (COTS) components as the foundation for Air Force
enhancements to meet specific customer requirements. The ADAPS program has
transitioned from concept exploration to engineering and manufacturing development
(EMD). This includes the completion of a detailed requirements analysis and a overall
system design. This paper will discuss the current status of the ADAPS program
including the requirements analysis process, details of the system design, and the
result of current COTS acquisitions.
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Ren, Jie. "Quantum Critical Systems from AdS/CFT." Thesis, Princeton University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3562222.
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<p>The AdS/CFT (anti-de Sitter/conformal field theory) correspondence enables us to construct some strongly coupled quantum field theories by means of general relativity, and this approach provides new universality classes of condensed matter systems. In this dissertation, we will consider three systems. </p><p> The first system (chapter 2) is the Reissner-Nordstrom (RN)-<i> AdS</i><sub>4</sub> black hole at finite temperature. By solving the Dirac equation for a massive, charged spinor in this background, we find that the fermions have a Rashba-like dispersion relation, and the Fermi surface has a spin-orbit helical locking structure. We use an improved WKB method that takes into account the spin-orbit coupling. The effective potential has a potential well with a barrier. The quasibound states in the potential well can tunnel through the barrier into the horizon, giving an imaginary part to the mode. </p><p> The second system (chapter 3) is the two-charge black hole in <i> AdS</i><sub>5</sub> at zero temperature, which gives an analytically solvable model for the holographic Fermi surface. Descending from type IIB supergravity, the two-charge black hole describes <i>N</i> coincident D3-branes with equal, nonzero angular momenta in two of the three independent planes of rotation orthogonal to the D3-brane world volume. The IR geometry of the extremal two-charge black hole is conformal to <i>AdS</i><sub> 2</sub> × [special characters omitted], and the electric field vanishes in the near horizon limit. </p><p> The third system (chapter 4) is the extremal RN-<i>AdS</i><sub> 5</sub> black hole, in which quantum criticality is studied by solving the Klein-Gordon equation. The Green's function near quantum critical points is analytically obtained. There are two types of instability: the first one is triggered by a zero mode, and gives a hybridized critical point; the second one is triggered by the instability of the IR geometry, and gives a bifurcating critical point.</p>
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Nekkache, Mabrouk. "Système de programmation parallèle OCCAM / ADA." Lyon, INSA, 1987. http://www.theses.fr/1987ISAL0063.
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La conception d'algorithmes parallèles pose des problèmes délicats, tels que la décomposition d'un système en sous-système parallèles, la synchronisation entre ces sous-systèmes, et l'exclusion mutuelle pour les données partageables, problèmes dus essentiellement à une vue de la programmation différente de celle de la programmation séquentielle. Pour se familiariser avec le parallélisme, la théorie et le matériel ne suffisent pas. Il est nécessaire de pratiquer et donc de disposer tout d'abord d'outils de familiarisation, de conception et de développement d'algorithmes parallèles, ensuite d'exécutif et éventuellement de vérificateur. En ce qui concerne l'expression du parallélisme, le langage OCCAM semble être adéquat; quant à l'exécutif nous avons exploré différentes solutions y compris celle offerte par ADA. Le système que nous avons développé autour de ces langages peut être considéré comme une aide à la spécification et au développement d'application temps réel en Ada<br>Designing parallel algorithms involves tricky features, as spitting systems in smaller parallel systems, synchronizing of the components, mutual exclusion on shared variables, all problems due to a view on programming as a scheduling activity rather than a sequencing one. Beyond hardware and theory, parallelism must be a know-how. So we need tools to study and practice. Occam seems a good basis, Ad a a most frequent one. So we have developed a translator from Occam to Ada, written in Ada, and the corresponding running environment. More than being a tool for study and practice parallel algorithms, first experiences suggest using tool as a practical mean of specify in Occam real-time later produced in Ada
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Jazaa, Abid Thyab. "Computer-aided mangement of ADA systems." Thesis, Keele University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314465.
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Thomas, Robert J. "Design and implementation of an airborne data collection system with application to precision landing systems (ADCS)." Ohio : Ohio University, 1993. http://www.ohiolink.edu/etd/view.cgi?ohiou1176237925.
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Jeswani, Sapna D. "ADSS a web-based agroforestry decision support system /." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000709.
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Kegel, Thomas, and Bruce Lipe. "THE ADAPS REAL-TIME / POST FLIGHT PROCESSING SYSTEM." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607324.
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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>This paper describes the Real-Time/Post-Flight Processing System (RT/PFP)
developed under the Air Force Flight Test Center (AFFTC) Advanced Data Acquisition
and Processing Systems (ADAPS) development program. The RT/PFP is currently being
deployed at all Range Division Mission Control Facilities as the principal Range Division
telemetry processing system. This paper provides an overview of the RT/PFP system, its
current capabilities, and future enhancements being developed. The RT/PFP is currently
used to support the F-22 flight test program, and to provide telemetry processing support
for the AFFTC Range Safety Office. The RT/PFP is also used in a mobile configuration
to support the Advanced Fighter Technology Integration program.
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Bai, Yunhao. "WiFi-Based Driver Activity Recognition Using CSI Signal." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1604876348378883.
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Stoddart, Evan. "Computer Vision Techniques for Automotive Perception Systems." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555357244145006.
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Wessman, Richard R. "Ada and the graphical kernel system /." Online version of thesis, 1988. http://hdl.handle.net/1850/10624.
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Ntsimane, M. H. (Mpho Hendrick). "The attitude determination and control systems (ADCS) task scheduler." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52487.
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Thesis (MScEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: A new task scheduler for the Attitude Determination and Control System (ADCS) of
the Stellenbosch University Satellite (SUNSAT) has been designed and tested on a
personal computer. This new scheduler is capable of uploading new control tasks, or
changing existing control tasks, on an individual basis. This is an improvement on the
current ADCS task scheduler, where the control tasks are hard-coded in the
scheduler, requiring the entire software image of the scheduler to be uploaded if a
new task is to be added, or an existing task is to be changed.
The new scheduler was developed using the Java programming language. The Java
ClassLoader class is used to dynamically load tasks to a linked list. The scheduler
thread runs through this linked list and schedules all the tasks that have become
schedulable. New tasks can be added to the list without stopping the scheduler.
The new scheduler has been successfully implemented on a personal computer,
laying a good foundation for implementation in an embedded environment based on
processors such as the T800 Transputer of the ADCS or the 80386 processor of the
secondary onboard computer (OBC2).<br>AFRIKAANSE OPSOMMING: 'n Nuwe taak skeduleerder vir die orientasie beheerstelsel (Engels: Attitude
Determination and Control System, of ADCS) van die Stellenbosch Universiteit
Satelliet (SUNSAT) is ontwerp en getoets op 'n persoonlike rekenaar. Hierdie nuwe
skeduleerder het die verrnoee om ekstra beheertake op te laai, of bestaande
beheertake te wysig, onafhanklik van mekaar. Dit is 'n verbetering op die huidige
ADCS taak skeduleerder waar take hard gekodeer is in die skeduleerder en waar
vereis word dat die volledige sagteware beeld van die skeduleerder opgelaai moet
word indien 'n nuwe taak bygevoeg wil word of 'n bestaande taak gewysig wil word.
Die nuwe skeduleerder is ontwikkel met behulp van die Java programmeringstaal.
Die Java C/assLoader klas is gebruik om take dinamies te laai en te voeg by 'n
skakellys. Die skeduleerder proses stap dan deur hierdie skakellys en skeduleer aile
take wat skeduleerbaar geword het. Nuwe take kan by die skakellys gevoeg word
sonder om die skeduleerder te stop.
Die nuwe skeduleerder is suksesvol ge'lmplementeer op 'n persoonlike rekenaar en Ie
'n goeie grondslag vir implementering in 'n toegewyde stelsel omgewing gebaseer op
byvoorbeeld die T800 Transputer van die ADCS of die 80386 verwerker van die
sekondere aanboord rekenaar (OBC2).
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Homann, Leschek Adam [Verfasser], and Gottfried [Akademischer Betreuer] Vossen. "Benchmarking recommender systems / Leschek Adam Homann ; Betreuer: Gottfried Vossen." Münster : Universitäts- und Landesbibliothek Münster, 2021. http://d-nb.info/1238690076/34.
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Lu, Shuxian. "Modélisation et validation expérimentale de concept de Détection Vidéo Coopérative destiné à un système stéréo anticollision inter-véhicule." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112154/document.
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Le travail de cette thèse a été consacré au développement d’une nouvelle méthode de détection pour un système anticollision par la mesure de trajectographie, ce qui pourrait contribuer aux systèmes d’aide à la conduite. Pour obtenir une haute probabilité de détection, nous avons choisi la solution de vidéo stéréoscopique coopérative : la coopération entre véhicules rend la détection plus facile et fiable. Il y a deux participants dans le système : les véhicules « porteurs du système » aussi bien que les « suiveurs », sont équipés de caméras stéréoscopiques, c’est à dire de deux capteurs d’image, appartenant à des familles technologique à haute cadence; les véhicules « cibles » sont équipés des feux à Leds modulés, dont la fréquence de modulation est déjà connue par les véhicules « suiveurs ». Après filtrage dans l’espace temporel, le système ne détecte que des signaux issus des feux modulés, ce qui réduit fortement l’information à traiter par rapport aux calculs de trajectographie traditionnels. La détection de feux modulés est donc réalisée par le filtrage par traitement numérique des images, qui est adapté à la fréquence de modulation recherchée. Pour cela, nous avons proposé 3 types de filtres adaptés à la fréquence de modulation et conçus de façon à rejeter au mieux les signaux de fond.Pour évaluer les performances tant en détection qu’en réjection des fausses alarmes, nous avons d’abord effectué des simulations numériques en prenant en compte des signaux artificiels, puis des calculs sur vrais signaux obtenus dans les expérimentations avec véhicule d’essai statique, puis roulant. Les roulages étaient de différentes vitesses, de 30km/h jusqu’à 100km/h, ce qui nous a permis d’analyser le signal issu du feu ainsi que le comportement de nos filtres à des vitesses angulaires de feu nulles, faibles ou élevées. Le résultat de ces expérimentations montre que le filtrage permet de détecter les feux à Leds de type DRL jusqu’à 140m sans aucune fausse détection sur le fond. Ces expérimentations sont une étape essentielle pour définir de façon plus précise un tel système, en particulier dans le choix du seuil. Nous avons aussi évalué des technologies qui peuvent améliorer la performance du système, mais qui ne sont pas encore prêtes à industrialiser. Par exemple, les « rétines » artificielles nous permettent d’utiliser les filtres analogiques intégrés, et ainsi de réduire leurs bandes passantes<br>This thesis was devoted to the development of a new detection method for vehicular collision avoidance system based on trajectory measurement, which could contribute to driver assistance systems.In order to obtain high detection probability, we have chosen the cooperative stereoscopic video solution: the cooperation between vehicles makes it easier and more reliable when they aim to detect each other. There are two participants in the system: the “system carriers" vehicles, or the " followers" are equipped with stereoscopic cameras (two image sensors), who belong to high speed technology families; the "targets" vehicles are equipped with modulated LED lights, with the modulation frequency being already known by the "followers". After space-time filtering, the system detects the signals emitted bymodulated lights sources, which greatly reduces the amount of information to be processed comparing to traditional trajectory calculations methods. The detection of modulated light is achieved by filtering based on digital image processing, which is adapted to the desired modulation frequency. We have proposed three types of filters suitable for detecting the modulation at this frequency and at the same time for rejecting the background as well as possible.In order to be able to evaluate the performances of both detecting signals and rejecting false alarms, we first performed numerical simulations based on the model signals, then calculations on real signals acquired in static and driving experiments. The tested speeds were from 30km/h up to 100km/h, which allowed us to analyze the signals emitted from vehicle lights as well as the behavior of our filters under different angular velocities of the lights (zero, low and high). The result of these experiments showed that our method of filtering could detect LED-type DRL lights up to 140m without any false alarm. This is essential to define more precisely the values of thresholds of such systems. We have also evaluated technologies that are possible to improve system performance in the future, which are not yet ready to be used in industry productions. For example, artificial "retinas" could allow us to integrate analog filters in the chips, and thus to reduce bandwidth of the filters
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Lin, Ying-Hsuan S. B. Massachusetts Institute of Technology. "Applying AdS/CFT to many body systems." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61259.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 49).<br>In this thesis, we model a many body system by a conformal field theory, and calculate the correlation function of a scalar operator in this theory using the AdS/CFT correspondence. We describe numerical techniques for calculating the retarded Green function of the operator. The results suggest that further improvement in the robustness of the codes is needed.<br>by Ying-Hsuan Lin.<br>S.B.
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Balasubramanian, ArunKumar. "Benchmarking of Vision-Based Prototyping and Testing Tools." Master's thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-229999.
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The demand for Advanced Driver Assistance System (ADAS) applications is increasing day by day and their development requires efficient prototyping and real time testing. ADTF (Automotive Data and Time Triggered Framework) is a software tool from Elektrobit which is used for Development, Validation and Visualization of Vision based applications, mainly for ADAS and Autonomous driving. With the help of ADTF tool, Image or Video data can be recorded and visualized and also the testing of data can be processed both on-line and off-line. The development of ADAS applications needs image and video processing and the algorithm has to be highly efficient and must satisfy Real-time requirements. The main objective of this research would be to integrate OpenCV library with ADTF cross platform. OpenCV libraries provide efficient image processing algorithms which can be used with ADTF for quick benchmarking and testing. An ADTF filter framework has been developed where the OpenCV algorithms can be directly used and the testing of the framework is carried out with .DAT and image files with a modular approach. CMake is also explained in this thesis to build the system with ease of use. The ADTF filters are developed in Microsoft Visual Studio 2010 in C++ and OpenMP API are used for Parallel programming approach.
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Sallez, Yves. "Conception d'un système de programmation hors ligne de cellules robotisées intégrant le langage ADA." Valenciennes, 1988. https://ged.uphf.fr/nuxeo/site/esupversions/3941307a-1d5e-4e41-8bd2-65df2a934515.
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Le système incluant les phases de description, programmation et simulation doit respecter les contraintes de modularité, prise en compte du parallélisme des activités au sein de la cellule, communication homme-machine. Un modèle conceptuel, décrivant les aspects fonctionnels, matériels et les caractéristiques de commande de la cellule, sert de base au modèle de description.
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Gerónimo, Gómez David. "A Global Approach to Vision-Based Pedestrian Detection for Advanced Driver Assistance Systems." Doctoral thesis, Universitat Autònoma de Barcelona, 2010. http://hdl.handle.net/10803/5795.
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A començaments del segle XXI, els accidents de tràfic han esdevingut un greu problema no només pels països desenvolupats sino també pels emergents. Com en altres àrees científiques on la Intel·ligència Artificial s'ha transformat en un actor principal, els sistemes avançats d'assistència al conductor, i concretament els sistemes de protecció de vianants basats en Visió per Computador, han esdevingut una important línia d'investigació adressada a millorar la seguretat dels vianants. Tanmateix, el repte és d'una complexitat considerable donada la variabilitat dels humans (p.e., roba, mida, relació d'aspecte, forma, etc.), la naturalesa dinàmica dels sistemes d'abord i els entorns no estructurats en moviment que representen els escenaris urbans. A més, els requeriments de rendiment son rigorosos en termes de cost computacional i d'indexos de detecció. En aquesta tesi, en comptes de centrar-nos en millorar tasques específiques com sol ser freqüent a la literatura, presentem una aproximació global al problema. Aquesta visió global comença per la proposta d'una arquitectura genèrica pensada per a ser utilitzada com a marc tant per a la revisió de la literatura com per a organitzar les tècniques estudiades al llarg de la tesi. A continuació enfoquem la recerca en tasques com la segmentació dels objectes en primer pla, la classificació d'objectes i el refinament tot seguint una visió general i explorant aspectes que normalment no son analitzats. A l'hora de fer els experiments, també presentem una nova base de dades que consisteix en tres subconjunts, cadascun adressat a l'evaluació de les diferents tasques del sistema. Els resultats presentats en aquesta tesi no només finalitzen amb la proposta d'un sistema de detecció de vianants sino que van un pas més enllà indicant noves idees, formalitzant algoritmes proposats i ja existents, introduïnt noves tècniques i evaluant el seu rendiment, el qual esperem que aporti nous fonaments per a la futura investigació en aquesta àrea.<br>At the beginning of the 21th century, traffic accidents have become a major problem not only for developed countries but also for emerging ones. As in other scientific areas in which Artificial Intelligence is becoming a key actor, advanced driver assistance systems, and concretely pedestrian protection systems based on Computer Vision, are becoming a strong topic of research aimed at improving the safety of pedestrians. However, the challenge is of considerable complexity due to the varying appearance of humans (e.g., clothes, size, aspect ratio, shape, etc.), the dynamic nature of on-board systems and the unstructured moving environments that urban scenarios represent. In addition, the required performance is demanding both in terms of computational time and detection rates. In this thesis, instead of focusing on improving specific tasks as it is frequent in the literature, we present a global approach to the problem. Such a global overview starts by the proposal of a generic architecture to be used as a framework both to review the literature and to organize the studied techniques along the thesis. We then focus the research on tasks such as foreground segmentation, object classification and refinement following a general viewpoint and exploring aspects that are not usually analyzed. In order to perform the experiments, we also present a novel pedestrian dataset that consists of three subsets, each one addressed to the evaluation of a different specific task in the system. The results presented in this thesis not only end with a proposal of a pedestrian detection system but also go one step beyond by pointing out new insights, formalizing existing and proposed algorithms, introducing new techniques and evaluating their performance, which we hope will provide new foundations for future research in the area.
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Malinský, Marek. "Namáhání ojnice v multi-body systému." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228976.
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The aim of my thesis is to create a procedure for the calculation of con rod stress in MBS Software. The thesis contains several parts, i.e. a short research of contemporary con rods, con rod modelling with the use of Pro/E, methodics of the finite-element con rod model preparation and model analysis in ANSYS Software, creating of virtual combustion engine template with flexible con rod and carrying out a strain hardening analysis in ADAM/Engine software. The theme of my thesis is quite demanding in the combination and the use of several computer software programmes. The thesis offers a survey of possibilities, procedures and methodics of con rod stress solutions that help to clarify the matter.
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Heywood, James K. "AUTOMATED TESTING OF THE ADVANCED DATA ACQUISITION AND PROCESSING SYSTEM." International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/606456.
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International Telemetering Conference Proceedings / October 22-25, 2001 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Software and techniques are described for testing the Advanced Data Acquisition and
Processing System (ADAPS), the primary flight test telemetry system used at Edwards
AFB, California. The software described acts as an additional simulation capability and
moves the simulation definition process into a realm where data is formed by means of a
high-order language. The potential for creation of more sophisticated simulated test data is
thus enabled. Extension of the techniques described in this paper to applications other than
testing is discussed.
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Young, Callum A. "Local structure/property relationships in functional materials." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:8eea6d96-5a48-4ed9-adad-e2b1fdc97acb.
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It is increasingly being realised that localised deviations from the average structure can play an important role in a material's properties, and hence an understanding of these deviations is essential when constructing a coherent picture of a system. In this thesis, both neutron and X-ray total scattering data have been collected and used to reveal information on three canonical systems: the high-temperature superconductor YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>; the parent compound of the colossal magnetoresistive manganites, LaMnO<sub>3</sub>; and the oldest known magnetic material, Fe<sub>3</sub>O<sub>4</sub>. Reverse Monte Carlo refinements-using the RMCProfile implementation of the algorithm-have been used as the principal analysis technique, and the functionality of the RMCProfile program has been extended to allow the refinement of magnetic systems involving substitutional disorder. For YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>, the focus of this thesis is on the apical Cu{O bond length. This is shown to have a bimodal distribution, but correlations in the displacements of both atoms disguise this fact in the average structure, thus resolving the apparent controversy that had existed between local- and average-structure probes. LaMnO<sub>3</sub> displays (what was thought to be) a simple order{disorder transition that results in the Jahn-Teller distortion becoming invisible in the average structure above ~ 750 K. Here it is shown that in fact the transition is more complicated, and involves a change in the symmetry of the Jahn-Teller distortion, whereby the long Mn-O bonds move from being opposite one another in the octahedra to being adjacent to one another. This new distortion still breaks the degeneracy of the system, and is consistent with a wide range of existing observations. Finally the low temperature structure of Fe<sub>3</sub>O<sub>4</sub> is examined using the updated RMCProfile code. The refinements show sensitivity to local structure variations, producing a bimodal Fe atom bond valence distribution. In addition, the refined magnetic spin configuration is presented, providing the first detailed description of the low-temperature magnetic structure. It is found to be a canted ferrimagnet, and appears to be consistent with Cc symmetry.
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Lindberg, David. "MSC Adams modelling of mechanical system in A400M Crew Entrance Door." Thesis, Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78100.
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Saab Aerostructures has developed the Crew Entrance Door (CED) for Airbus A400M. Airbus has decided some different load cases for which the Crew Entrance Door must be built to withstand without something breaking down. The door is maneuvered by a mechanical system and the load cases are essential for the sizing of the components in the mechanical system. Saab has previously used MS Excel to analytically calculate resulting forces in the mechanical system due to external and/or internal loads in the different load cases. This report describes how the mechanical system for A400M Crew Entrance Door instead can be modeled and solved numerically with the computer program MSC Adams/View. Creating a model of a mechanical system in MSC Adams/View proved to be easy and fairly quick. The benefit of working with MSC Adams instead of MS Excel is that it is quicker and more user friendly. The major differences when comparing results were believed to be an effect of comparing results from a kinematic model with results from a dynamic model. Therefore it is in the Authors opinion that the analytical method to calculate resulting forces with MS Excel can be replaced by numerical calculations with MSC Adams/View. However, apart from calculating reaction forces there are additional post-simulation calculations for which it is perhaps more beneficial to use MS Excel. To do these post-simulation calculations in MS Excel it is easy to use exported results from MSC Adams. If Saab Aerostructures decide to start working with MSC Adams/View and if Saab wants geometry to be imported to the model, then an advise from the Author is to have a software installed which can convert step-files (*.stp or *.step) to the MSC Adams preferred file format Parasolid (*.xmt_txt or *.x_t). The software should also be able to repair geometry which will greatly increase mass accuracy.
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Emanuelsson, Kajsa. "Examining factors for low use behavior of Advanced Driving Assistance Systems." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166400.
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Advanced Driving Assistance Systems (ADAS) has the potential to decrease the number of fatal accidents in traffic. However, in some cases, drivers with the systems in their car are resistant against using them. Exploring the underlying reasons and factors of the low-usage of ADAS was the purpose of this thesis. The thesis consists of Study I, an exploratory interview study with ten drivers who had cars with ADAS. The goal of Study I was to highlight the possible reasons behind the low usage of ADAS. The results of Study I were used to design Study II, which consisted of a survey targeted to drivers who had access to the ADAS adaptive cruise control and lane keep assist (N = 49). The results indicate that the factors or circumstances that affect usage depend on the ADAS and the user groups. Some identified underlying factors for low usage behavior of ADAS are the need to monitor the vehicle more when ADAS is activated and lack of trust in own ability when using ADAS compared to the high usage group.<br>Advanced Driving Assistance Systems (ADAS) har potential att förhindra antalet dödsfall i trafiken. Det förekommer att förare som har systemen i sin bil, väljer bort att använda dem. Syftet med den här uppsatsen var att undersöka underliggande orsaker och faktorer till låg användningsgrad av ADAS. Uppsatsen består av två studier. Studie I är en explorativ intervjustudie med tio förare som hade bilar med ADAS. Målet med Studie I var att ringa in de möjliga bakomliggande faktorerna för låg användningsgrad av ADAS. Resultaten från Studie I användes för att utforma en enkätstudie till Studie II som var riktad till förare som hade bilar med förarstödsystemen adaptiv farthållare och körfältsassistans (N = 49). Resultaten pekar på att de underliggande orsakerna och faktorerna beror på vilken ADAS som avses samt vilket användargrupp föraren tillhör. Några underliggande faktorer för låg användingsgruppen tycks vara känsla av att behöva övervaka fordonet samt lägre grad av tilltro till den egna förmågan än vad höganvändingsgrupper rapporterade.
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Furmanik, Olga, and Alireza Famili. "Control system integration in ADAMS : With emphasis on hauler Automatic Traction Control system." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45957.
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The thesis investigates control system integration in ADAMS and the thesis presents appropriate knowledge related to the topic as multi body system, acting forces between road and wheels, equation of motion regarding to the haulers, traction control system and differential locks. The emphasis of the thesis is to implement and test the automatic traction control (ATC) for the hauler into ADAMS and Simulink models. The ATC models are based on certain requirements provided by Volvo Construction Equipment. As expected, results indicate that the ATC model operates during simulation for various road conditions. Nevertheless, the ATC model includes a few defects which are observed in results. The significant achievement of the thesis is a great collaboration between ADAMS and Simulink model.
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Hafner, F. W. (Bill). "Advanced Data Acquisition and Processing System (ADAPS) – The Current State of the System." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607323.
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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>The technology growth in the Aerospace industry, as manifested and embodied in the
current fighter technology, presents many challenges in the area of flight test and data
processing. Past papers have delineated the concepts brought to bear in the design and
implementation of the AFFTC’s latest generation of telemetry data systems in the
Advanced Data Acquisition and Processing System (ADAPS) program. The current
deployed system incorporates the planned approach of commercial-off-the-shelf (COTS)
and government-off-the-shelf (GOTS) elements as basic to the system solution. The state
of the program has advanced through full development, delivery and performance testing.
The system is currently deployed in support of flight testing at Edwards AFB. This paper
will present the status of the program.
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Al-Qaed, Faisal. "An adaptive decision support system (adss) for B2C e-commerce." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488763.
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Wilde, James Ronald. "Experimental Evaluation and Adams Simulation of the Kinetic Suspension System." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1363865765.
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Botma, Pieter Johannes. "The design and development of an ADCS OBC for a CubeSat." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18040.
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Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: The Electronic Systems Laboratory at Stellenbosch University is currently developing a fully 3-axis controlled Attitude Determination and Control Subsystem (ADCS) for CubeSats. This thesis describes the design and development of an Onboard Computer (OBC) suitable for ADCS application. A separate dedicated OBC for ADCS purposes allows the main CubeSat OBC to focus only on command and data handling, communication and payload management.
This thesis describes, in detail the development process of the OBC. Multiple Microcontroller Unit (MCU) architectures were considered before selecting an ARM Cortex-M3 processor due to its performance, power efficiency and functionality. The hardware was designed to be as robust as possible, because radiation tolerant and redundant components could not be included, due to their high cost and the technical constraints of a CubeSat.
The software was developed to improve recovery from lockouts or component failures and to enable the operational modes to be configured in real-time or uploaded from the ground station. Ground tests indicated that the OBC can handle radiation-related problems such as latchups and bit-flips. The peak power consumption is around 500 mW and the orbital average is substantially lower. The proposed OBC is therefore not only sufficient in its intended application as an ADCS OBC, but could also stand in as a backup for the main OBC in case of an emergency.<br>AFRIKAANSE OPSOMMING: Die Elektroniese Stelsels Laboratorium by die Universiteit van Stellenbosch is tans besig om ’n volkome 3-as gestabiliseerde oriëntasiebepaling en -beheerstelsel (Engels: ADCS) vir ’n CubeSat te ontwikkel. Hierdie tesis beskryf die ontwerp en ontwikkeling van ’n aanboordrekenaar (Engels: OBC) wat gebruik kan word in ’n ADCS. ’n Afsonderlike OBC wat aan die ADCS toegewy is, stel die hoof-OBC in staat om te fokus op beheer- en datahantering, kommunikasie en loonvragbestuur.
Hierdie tesis beskryf breedvoerig die werkswyse waarvolgens die OBC ontwikkel is. Verskeie mikroverwerkers is as moontlike kandidate ondersoek voor daar op ’n ARM Cortex-M3-gebaseerde mikroverwerker besluit is. Hierdie mikroverwerker is gekies vanweë sy spoed, effektiewe kragverbruik en funksionaliteit. Die hardeware is ontwikkel om so robuust moontlik te wees, omdat stralingbestande en oortollige komponente weens kostebeperkings, asook tegniese beperkings van ’n CubeSat, nie ingesluit kon word nie.
Die programmatuur is ontwikkel om van ’n uitsluiting en ’n komponentfout te kan herstel. Verder kan programme wat tydens vlug in werking is, verstel word en vanaf ’n grondstasie gelaai word. Grondtoetse het aangedui dat die OBC stralingverwante probleme, soos ’n vergrendeling (latchup) of bis-omkering (bit-flip), kan hanteer. Die maksimum kragverbruik is ongeveer 500 mW en die gemiddelde wentelbaankragverbruik is beduidend kleiner. Die voorgestelde OBC is dus voldoende as ADCS OBC asook hoof-OBC in geval van nood.