Bibliografie tematiche / Landing on a mobile target

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Letteratura scientifica selezionata sul tema "Landing on a mobile target"

Autore: Grafiati

Pubblicato: 10 agosto 2024

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Articoli di riviste sul tema "Landing on a mobile target"

Kwak, Junyoung, Sangwoong Lee, Junsoo Baek e Baeksuk Chu. "Autonomous UAV Target Tracking and Safe Landing on a Leveling Mobile Platform". International Journal of Precision Engineering and Manufacturing 23, n. 3 (31 gennaio 2022): 305–17. http://dx.doi.org/10.1007/s12541-021-00617-8.

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Wang, Zian, Zheng Gong, Yang Yang, Yongzhen Liu, Pengcheng Cai e Chengxi Zhang. "Guidance Law for Autonomous Takeoff and Landing of Unmanned Helicopter on Mobile Platform Based on Asymmetric Tracking Differentiator". Mathematics 11, n. 1 (24 dicembre 2022): 66. http://dx.doi.org/10.3390/math11010066.

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For some flight missions, such as autonomous landing on mobile platforms, the demands on indicators such as target-tracking accuracy and so on are relatively high. To achieve this, a guidance system with excellent precision is necessary. An asymmetric tracking differentiator based on a tracking differentiator is proposed to establish the guidance system. On the basis of the proposed asymmetric tracking differentiator, an altitudinal and horizontal helicopter guidance system structure is designed. In this paper, a guidance law is designed in order to meet the accuracy and precision requirements in the autonomous landing and transition process. Apart from that, a plane-motion-guidance law is also designed to realize static and dynamic point tracking, linear route tracking and circular route tracking to improve the trajectory smoothness and accuracy. Finally, simulations of the autonomous landing process on moving platforms, including three stages, namely approaching, tracking and landing, are completed. The application effects and precision of the autonomous landing guidance algorithm under different wave heights and period conditions are analyzed through the obtained simulation curves.

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Sergeev, A. A., A. B. Filimonov e N. B. Filimonov. "Control of Autonomous Landing of UAV of Airplane-Type on the Static and Dynamic Sites with Using of "Flexible" Kinematic Trajectories". Mekhatronika, Avtomatizatsiya, Upravlenie 22, n. 3 (2 marzo 2021): 156–67. http://dx.doi.org/10.17587/mau.22.156-167.

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The final and one of the most important stages of the aircraft-type unmanned aerial vehicles (UAV) flight is landing. In this regard the problem of automating the control by UAV landing in difficult meteorological conditions is becoming increasingly urgent. In some cases for refueling and recharging UAVs it is advisable to use the dynamic mobile landing site (MLS) instead of the traditional stationary landing site (SLS). In the present paper we consider the setting of and solution of the control problem by the terminal landing maneuver of a UAV. It provides its transfer from the current initial state to the target final state along " flexible" kinematic trajectories both on the SLS and on the MLS. To solve the problem of automatic landing of UAV on SLS or MLS the mathematical model of the dynamics of its movement was developed. It’s based on the concept of " flexible" kinematic trajectories with spatial synchronization of controlled movements. The control algorithm by the terminal vertical landing maneuver of UAV on SLS by the method of dynamics inverse problem using the principle of " flexible" kinematic trajectories is developed. And also the control algorithm by the terminal landing maneuver of UAV on MLS by the method of dynamics inverse problems using the principles of " flexible" kinematic trajectories and aiming into the target point was also developed. Computer approbation of the synthesized control algorithms for the landing maneuver of UAV "Aerosonde" under conditions of various wind disturbances was carried out using digital modeling in the Matlab environment.

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Avilés-Viñas, Jaime, Roberto Carrasco-Alvarez, Javier Vázquez-Castillo, Jaime Ortegón-Aguilar, Johan J. Estrada-López, Daniel D. Jensen, Ricardo Peón-Escalante e Alejandro Castillo-Atoche. "An Accurate UAV Ground Landing Station System Based on BLE-RSSI and Maximum Likelihood Target Position Estimation". Applied Sciences 12, n. 13 (30 giugno 2022): 6618. http://dx.doi.org/10.3390/app12136618.

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Earth observation with unmanned aerial vehicles (UAVs) offers an extraordinary opportunity to bridge the gap between field observations and traditional air and space-borne remote sensing. In this regard, ground landing stations (GLS) systems play a central role to increase the time and area coverage of UAV missions. Bluetooth low energy (BLE) technology and the received signal strength indicator (RSSI) techniques have been proposed for target location during UAV landing. However, these RSSI-based techniques present a lack of precision due to the propagation medium characteristics, which leads to UAV position vagueness. In this sense, the development of a novel low-cost GLS system for UAV tracking and landing is proposed. The GLS system has been embodied for the purpose of testing the UAV landing navigation capability. The maximum likelihood estimator (MLE) algorithm is addressed on an embedded microcontroller for the position estimation based on the RSSI acquired from an array of BLE devices. Experimental results demonstrate the feasibility and accuracy of the ground landing station system, achieving average errors of less than 0.04 m with the UAV-MLE target position estimation approach. This 0.04 m distance represents an order of magnitude increase in location precision over other currently available solutions. In many cases, this increased precision can enable more innovative docking mechanisms, less likelihood of mishaps in docking, and also quicker docking. It may also facilitate docking procedures where the docking station is itself moving, which may be the case if the docking unit is a mobile ground rover.

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Yue, ZHU, HE Shuai, DUAN Xuechao e XU Ziqi. "UAV Landing Aid Hexapod Robot based on ArUco Marker and Sparse Optical Flow". Journal of Physics: Conference Series 2281, n. 1 (1 giugno 2022): 012002. http://dx.doi.org/10.1088/1742-6596/2281/1/012002.

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Abstract A UAV (Unmanned Aerial Vehicle) landing robot system based on a six-degree-of-freedom hexapod and computer vision with ArUco marker and sparse optical flow is implemented in this paper. By using binocular camera measuring the real-time position and orientation of UAV, a dynamic target tracking method based on ArUco marker and sparse optical flow is proposed. In this method, the ArUco marker is combined with sparse optical flow to improve the accuracy of target detection and the matching error of binocular stereo matching. The binocular vision system with ArUco marker is used to measure and calculate the relative coordinates of markers in the camera coordinate system. Then the UAV contour fitting is conducted in order to obtain the real-time position and orientation of this mobile target. The effectiveness of the novel UAV landing hexapod robot system based on ArUco marker combined with sparse optical flow is verified through the UAV capture experiment.

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Zhu, Jiangcheng, Jun Zhu e Chao Xu. "A simultaneous trajectory generation method for quadcopter intercepting ground mobile vehicle". International Journal of Advanced Robotic Systems 14, n. 4 (1 luglio 2017): 172988141771770. http://dx.doi.org/10.1177/1729881417717702.

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This article proposes a trajectory generator for quadcopter to intercept moving ground vehicle. For this air–ground interaction problem, we formulate the trajectory generation problem as quadratic dynamic programming in a moving-horizon scheme based on the quadcopter kinematics and observation to ground vehicle. The closed-form solution of quadratic dynamic programming in each iteration enables this algorithm a real-time replanning performance. Thereafter, segmented trajectory rule, inspired from commercial flight landing regular, is implemented to guarantee smoothness in approaching and interception to moving ground target from comparably far origin. Our established algorithm is verified through both simulations and experiments.

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Ibarra Jiménez, Efraín, e Manuel Jiménez-Lizárraga. "Robust tracking-surveillance and landing over a mobile target by quasi-integral-sliding mode and Hopf bifurcation". Journal of the Franklin Institute 359, n. 5 (marzo 2022): 2120–55. http://dx.doi.org/10.1016/j.jfranklin.2021.12.017.

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Kownacki, Cezary. "Artificial Potential Field Based Trajectory Tracking for Quadcopter UAV Moving Targets". Sensors 24, n. 4 (19 febbraio 2024): 1343. http://dx.doi.org/10.3390/s24041343.

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The trajectory or moving-target tracking feature is desirable, because it can be used in various applications where the usefulness of UAVs is already proven. Tracking moving targets can also be applied in scenarios of cooperation between mobile ground-based and flying robots, where mobile ground-based robots could play the role of mobile landing pads. This article presents a novel proposition of an approach to position-tracking problems utilizing artificial potential fields (APF) for quadcopter UAVs, which, in contrast to well-known APF-based path planning methods, is a dynamic problem and must be carried out online while keeping the tracking error as low as possible. Also, a new flight control is proposed, which uses roll, pitch, and yaw angle control based on the velocity vector. This method not only allows the UAV to track a point where the potential function reaches its minimum but also enables the alignment of the course and velocity to the direction and speed given by the velocity vector from the APF. Simulation results present the possibilities of applying the APF method to holonomic UAVs such as quadcopters and show that such UAVs controlled on the basis of an APF behave as non-holonomic UAVs during 90° turns. This allows them and the onboard camera to be oriented toward the tracked target. In simulations, the AR Drone 2.0 model of the Parrot quadcopter is used, which will make it possible to easily verify the method in real flights in future research.

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Choi, Sally H. J., Gary K. Yang, Keith Baxter e Joel Gagnon. "Evaluation of Aortic Zone 2 Proximal Landing Accuracy During Thoracic Endovascular Aortic Repair Following Carotid-Subclavian Revascularization". Vascular and Endovascular Surgery 55, n. 4 (4 febbraio 2021): 355–60. http://dx.doi.org/10.1177/1538574421989851.

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Background: Adequate seal for thoracic endovascular aortic repair (TEVAR) commonly requires landing in zone 2, but can prove to be challenging due to the tortuous and angulated anatomy of the region. Objectives: Our objective was to determine the proximal landing accuracy of zone 2-targeted TEVARs following carotid-subclavian revascularization (CSR) and its impact on clinical outcomes. Methods: Retrospective review of patients that underwent CSR for zone 2 endograft delivery at a tertiary institute between January 2008 and March 2018 was conducted. Technical outcomes were assessed by examining the incidence of intraoperative corrective maneuvers, 1a endoleaks and reinterventions. Distance to target and incidence of LSA stump filling were examined as radiographic markers of landing accuracy. Results: Zone 2-targeted TEVAR with CSR was performed in 53 patients for treatment of dissections (49%), aneurysms (30%) or trauma (21%). Nine (17%) cases required intraoperative corrective procedures: 5 (9%) proximal cuffs due to type 1a endoleak and 4 (8%) left common carotid artery (LCCA) stenting due to inadvertent coverage. Cases performed using higher resolution hybrid fluoroscopy machine compared to mobile C-arm were associated with increased proximal cuff use (OR 8.8; 95% CI 1.2-62.4). Average distance between the proximal edge of the covered graft to LCCA was 8 ± 1 mm and larger distances were not associated with higher rates of 1a endoleak. Twenty-eight (53%) cases of antegrade LSA stump filling were noted on follow-up imaging, but were not associated with higher rates of reinterventions (OR 0.8, 95% CI [0.2-4.6]). Three (6%) patients had a stroke within 30 days and 4 (8%) patients expired within 1 month. Intraoperative corrective maneuvers, post-operative 1a endoleak and reinterventions were not associated with higher rates of stroke or mortality. Conclusion: Using current endografts and imaging modalities, zone 2-targeted TEVARs have suboptimal technical accuracy.

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Accomando, Filippo, Andrea Vitale, Antonello Bonfante, Maurizio Buonanno e Giovanni Florio. "Performance of Two Different Flight Configurations for Drone-Borne Magnetic Data". Sensors 21, n. 17 (26 agosto 2021): 5736. http://dx.doi.org/10.3390/s21175736.

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The compensation of magnetic and electromagnetic interference generated by drones is one of the main problems related to drone-borne magnetometry. The simplest solution is to suspend the magnetometer at a certain distance from the drone. However, this choice may compromise the flight stability or introduce periodic data variations generated by the oscillations of the magnetometer. We studied this problem by conducting two drone-borne magnetic surveys using a prototype system based on a cesium-vapor magnetometer with a 1000 Hz sampling frequency. First, the magnetometer was fixed to the drone landing-sled (at 0.5 m from the rotors), and then it was suspended 3 m below the drone. These two configurations illustrate endmembers of the possible solutions, favoring the stability of the system during flight or the minimization of the mobile platform noise. Drone-generated noise was filtered according to a CWT analysis, and both the spectral characteristics and the modelled source parameters resulted analogously to that of a ground magnetic dataset in the same area, which were here taken as a control dataset. This study demonstrates that careful processing can return high quality drone-borne data using both flight configurations. The optimal flight solution can be chosen depending on the survey target and flight conditions.

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Più fonti

Tesi sul tema "Landing on a mobile target"

Alatorre, Sevilla Armando. "Landing of a fixed-wing unmanned aerial vehicle in a limited area". Electronic Thesis or Diss., Compiègne, 2024. http://www.theses.fr/2024COMP2801.

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Le projet de thèse consiste à développer une solution pour l'atterrissage d'un drone à voilure fixe de configuration classique dans une zone limitée. Le principal défi consiste à réduire la vitesse de l'avion à une phase minimale pendant le vol, à l'aide d'algorithmes de contrôle automatique. La réduction de la vitesse d'un drone à voilure fixe s'effectue en augmentant son angle d'attaque, ce qui implique un freinage par la force de traînée. Cependant, cette manœuvre est critique pour un avion conventionnel, parce que si son angle d'attaque augmente au-delà de l'angle de décrochage, le véhicule peut perdre sa contrôlabilité, c'est-à-dire qu'il est possible que le véhicule aérien s'effondre et que sa structure soit endommagée. Le modèle mathématique est une représentation d'équations qui décrit le comportement de la dynamique du système. En considérant plusieurs variables pour obtenir une meilleure approximation de la dynamique du système, dans notre cas le véhicule à voilure fixe, la conception des stratégies de contrôle sera plus difficile et plus complexe. Dans ce travail de recherche, nous utiliserons un modèle mathématique non linéaire car les effets de décrochage peuvent être inclus par des approximations mathématiques du moment de tangage, des forces de portance et de traînée. Cela nous permet d'obtenir une meilleure performance des lois de contrôle pour la navigation autonome du drone à voilure fixe. L'une des limites des véhicules à voilure fixe est qu'ils atterrissent dans des espaces de dimensions réduites et que le pourcentage de dommages subis par leur structure est élevé. En outre, les perturbations extérieures et l'inexpérience des pilotes augmentent le risque de dommages. Il est bien connu qu'il est très difficile de satisfaire aux conditions d'une piste d'atterrissage. Par conséquent, la communauté scientifique s'est efforcée de mettre au point des solutions pour l'atterrissage dans des zones limitées. Dans la littérature, on trouve quelques solutions basées sur des véhicules hybrides et des systèmes de récupération. Les véhicules hybrides consistent à modifier la structure d'un véhicule à voilure fixe. Les moteurs sont répartis stratégiquement pour obtenir une configuration de véhicule multirotor, offrant certaines caractéristiques telles que le décollage et l'atterrissage verticaux. Cependant, ces actionneurs augmentent la masse du véhicule, la consommation d'énergie (ce qui réduit la durabilité du vol), la probabilité de défaillance, le coût d'acquisition, de réparation et d'entretien. Notre objectif dans ce travail de recherche est de concevoir et de valider des stratégies de contrôle pour l'atterrissage d'un drone à voilure fixe dans un espace limité. Les stratégies de contrôle ont été conçues selon deux approches : la première est basée sur le développement de manœuvres pour un drone à voilure fixe afin de réduire la vitesse à une phase minimale pendant le vol. Dans la deuxième approche, nous avons travaillé sur les stratégies de contrôle pour l'atterrissage d'un drone à voilure fixe sur un véhicule terrestre en mouvement. Une stratégie de contrôle a été proposée pour réduire la vitesse du drone à voilure fixe au minimum afin d'être capturé par un système de récupération. La stratégie de contrôle a été divisée en trois étapes de vol : dans la première étape, l'avion s'aligne dans le plan x-y tandis qu'il est conduit à une altitude souhaitée pour effectuer un vol de croisière. L'étape suivante consiste en un vol ascendant, axé sur le suivi d'une référence angulaire basée sur une trajectoire phugoïde. Cette trajectoire implique une augmentation de l'angle d'attaque jusqu'à l'angle de décrochage de l'avion. Ainsi, la vitesse aérienne obtient une réduction maximale dans des conditions sûres, permettant au drone d'être capturé par le système de récupération. Toutefois, si le drone n'est pas capturé par le système de récupération, une stratégie de contrôle est appliquée pour rétablir le vol de l'aéronef
The development of this thesis consists of designing some control strategies that allow a fixedwing drone with classical configuration to perform a safe landing in a limited area. The main challenge is to reduce the aircraft’s airspeed avoiding stall conditions. The developed control strategies are focused on two approaches: the first approach consists of the designing airspeed reduction maneuvers for a fixed-wing vehicle to be captured by a recovery system and for a safe landing at a desired coordinate. The next approach is focused on landing a fixed-wing drone on a moving ground vehicle. A dynamic landing trajectory was designed to lead a fixedwing vehicle to the position of a ground vehicle, reaching its position in a defined distance. Moreover, this trajectory was used in a cooperative control design. The control strategy consists of the synchronization of both vehicles to reach the same position at a desired distance. The aerial vehicle tracks the dynamic landing trajectory, and the ground vehicle controls its speed. In addition, we will propose a control architecture with a different focus, where the ground vehicle performs the tracking task of the aerial vehicle’s position in order to be captured. And, the drone’s task is to track a descending flight until the top of the ground vehicle. However, considering the speed difference between both vehicles. Therefore, we propose a new control architecture defining that the aircraft performs an airspeed reduction strategy before beginning its landing stage. The aircraft will navigate to a minimum airspeed, thus, allowing the ground vehicle to reach the fixed-wing drone’s position by increasing its speed. The control laws of each strategy were determined by developing the Lyapunov stability analysis, thus, the stability is guaranteed in each flight stage. Finally, the control strategies were implemented on prototypes allowing us to validate their performance and obtain satisfactory results for safe landing of a fixed-wing drone with classical configuration

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Hansén, Rasmus, Axel Ringh, Victoria Svedberg e Nils Landin. "Autonomus Helicopter Landing on a Mobile Platform". Thesis, KTH, Optimeringslära och systemteori, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105551.

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In this thesis we investigate the problem of landing a helicopter autonomously on a mobile platform by designing controllers for the attitude- and translational dynamics in parallel. A mathematical model of the helicopter, in form of general 6-degrees-of-freedom rigid-body dynamics with application-specific actuations, is developed. A linearized model is used in order to make a landing problem more tractable, which is also rather reasonable under landing constraints, where small angle- and velocity approximations are valid. The inputs used for the attitude controller are the tail rotor thrust and the tip-path-plane angles. Then, a form of cascaded control is adopted for the translational dynamics, in which the inputs are the Euler angles together with the main rotor thrust. The resulting control system is tested by MATLAB simulations against a smooth position reference path, with satisfying results. For the landing scenario, a trajectory planning strategy based on linear model predictive control (MPC) is adopted. The cascaded control system is then used to track the translational reference trajectory. The translational reference trajectory is chosen such that the attitude dynamics is adapted to the attitude of the platform at touch-down.
Den här uppsatsen undersöker problemet att autonomt landa en modellhelikopter på en mobil plattform genom att använda olika regulatorer för attityd- och translationsdynamiken. Den matematiska beskrivningen av helikoptern utgår från dynamiken för en stel kropp med 6 frihetsgrader. Eftersom landning kan genomföras med låga hastigheter och små vinklar används en linjär modell för att göra problemet mer lätthanterligt. Insignalerna till systemet är kraften från stjärtrotorn och lutningsvinklarna av huvudrotorns Tip-Path-Plane. En kaskadregulator används för att styra translationssystemet med eulervinklarna och kraften från huvudrotorn, som insignaler. Regulatorn testas i en MATLAB-simulering mot en glatt referensbana med godkända resultat. För landingsproceduren används en banplaneringsstrategi som bygger på linjär prediktiv reglering (PR). Kaskadregulatorn används sedan för att följa translationsreferenserna, vilka blir valda så att även attitydsystemet anpassas efter plattformens attityd i landningsögonblicket.

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Gising, Andreas. "MALLS - Mobile Automatic Launch and Landing Station for VTOL UAVs". Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-15980.

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The market for vertical takeoff and landing unmanned aerial vehicles, VTOL UAVs, is growing rapidly. To reciprocate the demand of VTOL UAVs in offshore applications, CybAero has developed a novel concept for landing on moving objects called MALLS, Mobile Automatic Launch and Landing Station. MALLS can tilt its helipad and is supposed to align to either the horizontal plane with an operator adjusted offset or to the helicopter skids. Doing so, eliminates the gyroscopic forces otherwise induced in the rotordisc as the helicopter is forced to change attitude when the skids align to the ground during landing or when standing on a jolting boat with the rotor spun up. This master’s thesis project is an attempt to get the concept of MALLS closer to a quarter scale implementation. The main focus lies on the development of the measurement methods for achieving the references needed by MALLS, the hori- zontal plane and the plane of the helicopter skids. The control of MALLS is also discussed. The measurement methods developed have been proved by tested implementations or simulations. The theories behind them contain among other things signal ﬁltering, Kalman ﬁltering, sensor fusion and search algorithms. The project have led to that the MALLS prototype can align its helipad to the horizontal plane and that a method for measuring the relative attitude between the helipad and the helicopter skids have been developed. Also suggestions for future improvements are presented.

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Peluchon, Mathias. "Autonomous landing of multicopters on mobile platforms : Design of an autonomous landing solution for multicopters on mobile platforms, based on a ultrasonic local positionning technology". Thesis, KTH, Fordonsdynamik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261186.

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This work studies the use of an ultrasonic 3D positioning system in multicopter landing applications. Its aim is to develop a solution for autonomous landing of rotary wings systems on mobile platforms, especially boat decks using the positioning system developed by the French startup Internest. First, the position sensing algorithms will be improved so as to let them provide accurate relative position measurements in moving reference frames. Then a first implementation of a control algorithm based on PIDs will be considered, discussed and tested. Finally some improvements will be studied, with the use of trajectory planning and feedforward control, as well as the definition of a reference model. The whole work is led in an industrial R&D context, with the aim of developing simple but effective solutions that can easily be used in numerous applications, on a large variety of systems.
Det här arbete studerar hur man kan använda 3D positionering med ultraljud för att landa multicenter. Målet är att utveckla en lösning för autonom landning av olika system på mobila plattformar, i synnerhet på båtdäck, med en teknik som utvecklats ett fransk företag, Internest. Först, lägesalgoritmnerna ska förbättras så att de kan ge exakt positionsmätningar i rörliga referensramar. Sedan gjordes en första implementering av lägesalgoritmen med PID som studerades och testades. Till sist, implementerades och och förbättrades algoritmen med banplannering, feedforward reglering, och en referensmodell. Allt detta arbete är genomfört i ett industriellt sammanhang, med målet att utveckla enkla men eﬀektiva lösningar som kan användas i olika applikationer, med olika system.

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Williams, Christopher G. "Physics-based modeling and assessment of mobile landing platform system design". Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Sept/08Sep%5FWilliams.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, September 2008.
Thesis Advisor(s): Papoulias, Fotis ; Gordis, Joshua. "September 2008." Description based on title screen as viewed on November 4, 2008 Includes bibliographical references (p. 73-74). Also available in print.

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Stenström, Jonathan. "Simultaneous Trajectory Optimization and Target Estimation Using RSS Measurements to Land a UAV". Thesis, Linköpings universitet, Reglerteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131117.

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The use of autonomous UAV’s is a progressively expanding industry. This thesisfocuses on the landing procedure with the main goal to be independent of visualaids. That means that the landing site can be hidden from the air, the landingcan be done in bad weather conditions and in the dark. In this thesis the use ofradio signals is investigated as an alternative to the visual sensor based systems.A localization system is needed to perform the landing without knowing wherethe landing site is. In this thesis an Extended Kalman Filter (EKF) is derived andused for the localization, based on the received signal strength from a radio beaconat the landing site. There are two main goals that are included in the landing,to land as accurate and as fast as possible. To combine these two goals a simultaneoustrajectory optimization and target estimation problem is set up that can bepartially solved while flying. The optimal solution to this problem produces thepath that the UAV will travel to get the best target localization while still reachingthe target. It is shown that trying to move directly towards the estimated landingsite is not the best strategy. Instead, the optimal trajectory is a spiral that jointlyoptimizes the information from the sensors and minimizes the arrival time.

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Lizarraga, Mariano I. "Autonomous landing system for a UAV". Thesis, Monterey California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1655.

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Approved for public release, distribution is unlimited
This thesis is part of an ongoing research conducted at the Naval Postgraduate School to achieve the autonomous shipboard landing of Unmanned Aerial Vehicles (UAV). Two main problems are addressed in this thesis. The first is to establish communication between the UAV's ground station and the Autonomous Landing Flight Control Computer effectively. The second addresses the design and implementation of an autonomous landing controller using classical control techniques. Device drivers for the sensors and the communications protocol were developed in ANSI C. The overall system was implemented in a PC104 computer running a real-time operating system developed by The Mathworks, Inc. Computer and hardware in the loop (HIL) simulation, as well as ground test results show the feasibility of the algorithm proposed here. Flight tests are scheduled to be performed in the near future.
Lieutenant Junior Grade, Mexican Navy

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Zhao, Honglin, Xianming Zhao e Tingxian Zhou. "Remote Control Multiple Mobile Target System with CDMA". International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/611458.

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International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California
At present, multiple mobile targets will be remote controlled in many remote control and telemetry system, in which multiple access technology will be applied. This paper proposes a communication scheme to remote control multiple mobile targets using Coded-Division Multiple Access(CDMA) technique. It's feasibility, advantage and shortcoming are analyzed. Moreover, the key techniques of Direct-Sequence Spread Spectrum(DS/SS) system, i.e. the correlation detection and delay lock-on techniques, are studied and stimulated on the experimental model. The results of theoretical analysis show that the CDMA system has the peculiar advantage over the conventional multiple access system, such as FDMA and TDMA.

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Barber, D. Blake. "Accurate target geolocation and vision-based landing with application to search and engage missions for miniature air vehicles /". Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1704.pdf.

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Arragattu, Prashanth Kumar. "ISCSI performance for mobile appliances using intermediate target storage". Thesis, Wichita State University, 2009. http://hdl.handle.net/10057/2433.

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Looking at the present demand for mobile services we can predict that there will be an explosive growth in the usage of mobile appliances in the future. But these mobile appliances suffer from significant problems related to storage restrictions and limited computing resources. However, the increased demand for mobile services has resulted in wide spread research to provide remote storage service for mobile appliance using iSCSI. The iSCSI protocol enables the block level I/O and high-capacity storage service over general IP networks. But iSCSI, in a client-server environment is very sensitive to latency (delay time) and when applied to the mobile appliance results in a rapid performance degradation when the mobile appliance (client) moves far away from the storage server. In this research, authors describe a new availability remote storage system called an intermediate storage server, which localizes the iSCSI target to the mobile appliance. Thus, when the client moves far away from the primary storage server will automatically get connected to the intermediate storage server rather than trying to establish connection with the primary storage server. This reduces the latency or delay time involved in contacting and accessing the resources from the storage server.
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical and Computer Engineering

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Libri sul tema "Landing on a mobile target"

Omode, Akemi. Mobile suit gundam wing: Blind target. San Francisco: Viz Communications, 2001.

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Manzitti, Edward T. Mobile marketing: Consumer perspectives. New York: Direct Marketing Association, 2008.

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Association, United States LST, a cura di. Large slow target: A history of the LST. Toledo, Ohio: U.S. LST Association, 1986.

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Ben, Salter, a cura di. Mobile marketing: Achieving competitive advantage through wireless technology. Amsterdam: Elsevier BH, 2006.

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Kuznecov, Sergey, e Konstantin Rogozin. All of physics on your palm. Interactive reference. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/501810.

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This is a unique visual book created by the best techniques of modern education. It presents the basic laws and formulas for all sections of physics with a huge number of interactive additions, explanations, illustrations, charts, graphs, tables, and drawings, allowing you to learn the material more efficiently. A clear and concise style of writing focuses the reader's attention in the target material, and numerous exercises, control questions and tasks allow you to securely fix in the memory the knowledge. Additional materials for all sections of General physics course available to You on the Internet in ABS Znanium.com. Using your mobile device, scan the QR code and get it on your smartphone or tablet access to comprehensive information throughout the course of physics in the media formats. In addition, on the YouTube channels "Salisylate and Isminimal from rocky" (from "the Russian Creative Internet") hosted a large number of additional training materials and videos used in this book. Interactive Handbook is intended for use in the educational activities of teachers and students of technical specialties of full-time and distance learning forms, as well as students of technical schools and secondary schools.

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New Mobile Report Gundam Wing "Blind Target". Gakken, 1999.

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Michael, Alex, e Ben Salter. Mobile Marketing. Taylor & Francis Group, 2006.

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Michael, Alex, e Ben Salter. Mobile Marketing. Taylor & Francis Group, 2006.

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Michael, Alex, e Ben Salter. Mobile Marketing. Taylor & Francis Group, 2006.

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Michael, Alex, e Ben Salter. Mobile Marketing. Taylor & Francis Group, 2006.

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Voos, Holger. "Nonlinear Landing Control for Quadrotor UAVs". In Autonome Mobile Systeme 2009, 113–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-10284-4_15.

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Yang, Shuang-Hua. "Mobile Target Localization and Tracking". In Signals and Communication Technology, 217–34. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5505-8_10.

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Ribeiro, Rita A., Tiago C. Pais e Luis F. Simões. "Benefits of Full-Reinforcement Operators for Spacecraft Target Landing". In Preferences and Decisions, 353–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15976-3_21.

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Shareef, Mahmud Akhter, Yogesh K. Dwivedi e Vinod Kumar. "Target Marketing and Development of the Communication Channel". In Mobile Marketing Channel, 103–19. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31287-3_6.

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Gupta, Ashima, Chao Gui e Prasant Mohapatra. "Mobile Target Tracking Using Sensor Networks". In Mobile, Wireless, and Sensor Networks, 173–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/0471755591.ch7.

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Yang, Qing, Lu Su, Quanlong Li e Xiaofei Xu. "Cooperative Target Localization Method for Heterogeneous Sensor Networks". In Networking and Mobile Computing, 13–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11534310_4.

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Bazán, Eric, Petr Dokládal e Eva Dokládalová. "Unsupervised Perception Model for UAVs Landing Target Detection and Recognition". In Advanced Concepts for Intelligent Vision Systems, 233–44. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01449-0_20.

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Engels, Florian. "Target Shape Estimation Using an Automotive Radar". In Smart Mobile In-Vehicle Systems, 271–90. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-9120-0_16.

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Shi, Jinyu, e Weijia Jia. "Real-Time Target Tracking Through Mobile Crowdsensing". In Lecture Notes in Computer Science, 3–18. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68786-5_1.

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Cao, Junhong, Tao Jiang, Jianzhong Shang, Yuze Xu e Zirong Luo. "Design of Humanoid Intelligent Mobile Target Robots". In Proceedings of 2021 International Conference on Autonomous Unmanned Systems (ICAUS 2021), 955–64. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9492-9_94.

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Atti di convegni sul tema "Landing on a mobile target"

Beul, Marius, Sebastian Houben, Matthias Nieuwenhuisen e Sven Behnke. "Fast autonomous landing on a moving target at MBZIRC". In 2017 European Conference on Mobile Robots (ECMR). IEEE, 2017. http://dx.doi.org/10.1109/ecmr.2017.8098669.

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Tatoglu, Akin, Cheng Chun Yin, Brianna Cervello, Antonio Corrado, Bernard Balko e Kiwon Sohn. "Aerial Vehicle Rapid 3D Map Generation for Safe Landing Area Detection". In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95849.

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Abstract This project assists in building a robust control LiDAR scanning unit that helps aerial vehicles land autonomously. The LiDAR scans the terrain, detects static or dynamic obstacles, and helps target safe landing areas. The whole terrain scanning system uses a robust control system to control the LiDAR position to collect point clouds around the environment and use ICP (Iterative Closest Point) to create a 3D point cloud map. In the robust control system, IMU (Inertial Measurement Unit) is used to control the servo to ensure the control system had an accurate target angle for the LiDAR scanning. MSAC algorithm is used in the 3D mapping to help the system detect flat areas for an aerial vehicle to land. This project also shows the different voxelization levels (1 × 1 and 5 × 5) of the flat surfaces and the maximum point to plane distance changed (0.05, 0.25, 1, and 10). Also, an exaggerated voxelization level (10 × 10) was investigated to get a rapid first-level estimation of flat surfaces. The results of the different values and comparisons are also noted and shared. This study is the variable resolution mapping and perception portion of our full-scale heterogeneous localization and mapping research project of Autonomous Mobile Robotics Research Group.

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Udomkesmalee, S., Ching-Fang Lin, A. Politopoulos, Guohui Hu e T. Huntsberger. "Autonomous Target Tracking for Asteroid Landing". In 4th International Conference on Control and Automation. Final Program and Book of Abstracts. IEEE, 2003. http://dx.doi.org/10.1109/icca.2003.1595036.

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Liu, Ming, e Zhongzheng Liu. "Mobile Aircraft Landing Stair Scheduling". In 2019 International Conference on Industrial Engineering and Systems Management (IESM). IEEE, 2019. http://dx.doi.org/10.1109/iesm45758.2019.8948217.

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Saripalli, Srikanth, e Gaurav S. Sukhatme. "Landing a Helicopter on a Moving Target". In 2007 IEEE International Conference on Robotics and Automation. IEEE, 2007. http://dx.doi.org/10.1109/robot.2007.363620.

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Mohr, J., P. Hengst e W. McKay. "Design Change Management, Mobile Landing Platform". In Maritime Project Management 2016. RINA, 2016. http://dx.doi.org/10.3940/rina.mpm.2016.02.

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Kumar, Darmesh, Jai Raj, Krishna Raghuwaiya e Jito Vanualailai. "Autonomous UAV Landing on Mobile Platforms". In 2021 IEEE Asia-Pacific Conference on Computer Science and Data Engineering (CSDE). IEEE, 2021. http://dx.doi.org/10.1109/csde53843.2021.9718368.

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Xu, Lingyun, e Haibo Luo. "Towards autonomous tracking and landing on moving target". In 2016 IEEE International Conference on Real-time Computing and Robotics (RCAR). IEEE, 2016. http://dx.doi.org/10.1109/rcar.2016.7784101.

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Jung, Wooyoung, Youngjoo Kim e Hyochoong Bang. "Target state estimation for vision-based landing on a moving ground target". In 2016 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE, 2016. http://dx.doi.org/10.1109/icuas.2016.7502552.

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K. Dalamagkidis. "A Mobile Landing Platform for Miniature Vertical Take-Off and Landing Vehicles". In 2006 14th Mediterranean Conference on Control and Automation. IEEE, 2006. http://dx.doi.org/10.1109/med.2006.236965.

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Rapporti di organizzazioni sul tema "Landing on a mobile target"

Verma, S. K. Mobile Microwave Landing System (MMLS) User Interface. Fort Belvoir, VA: Defense Technical Information Center, maggio 1991. http://dx.doi.org/10.21236/ada237470.

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Schulz, Matthew. Target Modeling for Ground Mobile Branch (GMB). Fort Belvoir, VA: Defense Technical Information Center, agosto 2011. http://dx.doi.org/10.21236/ada558425.

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Muelaner, Jody Emlyn. Decarbonized Power Options for Non-road Mobile Machinery. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, gennaio 2023. http://dx.doi.org/10.4271/epr2023002.

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<div class="section abstract"><div class="htmlview paragraph">Power options for off-road vehicles differ substantially from other commercial vehicles. Battery electrification is suitable for urban construction and light agriculture, but remote mining, forestry, and road building operations will require alternative fuels.</div><div class="htmlview paragraph"><b>Decarbonized Power Options for Non-road Mobile Machinery</b> discusses these domains as well as the potential benefits and challenges of implementing fuels and energy sources such as bioenergy, e-fuels, and alcohol, as well as hydrogen, hydrocarbon, and direct methanol fuel cells.</div><div class="htmlview paragraph"><a href="https://www.sae.org/publications/edge-research-reports" target="_blank">Click here to access the full SAE EDGE</a><sup>TM</sup><a href="https://www.sae.org/publications/edge-research-reports" target="_blank"> Research Report portfolio.</a></div></div>

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bin Ahsan, Wahid, Imran Hossain, Habibur Rahman, Nasir Uddin, Kazi Harunur Rashid, Shahariar Ratul, Zannatul Ferdous, Fariha Islam e Abu MD Ehsan. Global Mobile App Accessibility: A Comparative Study of WCAG Compliance Across 12 Countries. Userhub, aprile 2024. http://dx.doi.org/10.58947/mxrc-rzkh.

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This study assesses the accessibility of mobile applications across twelve countries, including the USA, Vietnam, Turkey, Ireland, and South Korea. Our evaluation of 60 popular apps reveals a widespread failure to meet the Web Content Accessibility Guidelines (WCAG), with Vietnam exhibiting the highest average of 41.2 violations per app. These violations were particularly prevalent in essential areas such as touch target size and color contrast, critical for users with visual and motor impairments. Despite robust accessibility laws such as the Americans with Disabilities Act (ADA) in the USA and the European Accessibility Act (EAA) in the EU, our findings indicate a significant gap between these legal frameworks and their practical application. Our study highlights the urgent need for a multifaceted approach that includes strict enforcement, enhanced developer education with a focus on cross-cultural accessibility, and international cooperation. This research underscores the importance of integrating accessibility as a core component of digital infrastructure development to ensure mobile applications are truly accessible to all users.

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Sarofim, Samer. Developing an Effective Targeted Mobile Application to Enhance Transportation Safety and Use of Active Transportation Modes in Fresno County: The Role of Application Design & Content. Mineta Transportation Institute, luglio 2021. http://dx.doi.org/10.31979/mti.2021.2013.

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This research empirically investigates the need for, and the effective design and content of, a proposed mobile application that is targeted at pedestrians and cyclists in Fresno County. The differential effect of the proposed mobile app name and colors on the target audience opinions was examined. Further, app content and features were evaluated for importance and the likelihood of use. This included design appeal, attractiveness, relevance, ease of navigation, usefulness of functions, personalization and customization, message recipients’ attitudes towards message framing, and intended behaviors related to pedestrian, cyclist, and motorist traffic safety practices. Design mobile application features tested included image aesthetics, coherence and organization, and memorability and distinction. Potential engagement with the mobile app was assessed via measuring the users’ perceived enjoyment while using the app. The behavioral intentions to adopt the app and likelihood to recommend the app were assessed. The willingness to pay for purchasing the app was measured. This research provided evidence that a mobile application designed for pedestrians and cyclists is needed, with high intentions for its adoption. Functions, such as Safety Information, Weather Conditions, Guide to Trails, Events for Walkers and Bikers, and Promotional Offers are deemed important by the target population. This research was conducted in an effort to increase active transportation mode utilization and to enhance the safety of vulnerable road users. The public, city administrators, transportation authorities, and policy makers shall benefit from the results of this study by adapting the design and the features that are proposed in this research and were found appealing and useful for the target vulnerable road user groups. The need of the proposed mobile application and its main functions are established, based on the results of this research, which propagates further steps of implementation by city administrators and transportation authorities.

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Qian, Yuping, Yangjun Zhang e WEILIN ZHUGE. Key Technology Challenges of Electric Ducted Fan Propulsion Systems for eVTOL. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, novembre 2023. http://dx.doi.org/10.4271/epr2023027.

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<div class="section abstract"><div class="htmlview paragraph">Electrical vertical takeoff and landing (eVTOL) vehicles for urban air mobility (UAM) are garnering increased attention from both the automotive and aerospace industries, with use cases ranging from individual transportation, public service, cargo delivery, and more. Distributed electric propulsion systems are their main technical feature; they determine vehicle size and propulsion efficiency and provide distributed thrust to achieve attitude control. Considering the intended role of eVTOL vehicles, ducted-fan systems are ideal choice for the propulsor, as the duct provides a physical barrier between the rotating blades and the human, especially during the take-off and landing phases.</div><div class="htmlview paragraph"><b>Key Technology Challenges of Electric Ducted Fan Propulsion Systems for eVTOL</b> introduces the main bottlenecks and key enablers of ducted-fan propulsion systems for eVTOL applications. Based on the introduction and discussion of these important issues, this report will help eVTOL engineers understand the key technical issues and inspire them to develop the ideal solutions that will enable eVTOL vehicle deployment for UAM operations.</div><div class="htmlview paragraph"><a href="https://www.sae.org/publications/edge-research-reports" target="_blank">Click here to access the full SAE EDGE</a><sup>TM</sup><a href="https://www.sae.org/publications/edge-research-reports" target="_blank"> Research Report portfolio.</a></div></div>

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Chotelal, Shreshta, Marla Dukharan, Jeetendra Khadan e Melissa Marchand. Financial Inclusion and FinTech in Suriname. Inter-American Development Bank, febbraio 2022. http://dx.doi.org/10.18235/0003988.

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This paper examines the potential role FinTech can play to support Surinames financial inclusion efforts. Financial technologyor “FinTech”describes the integration of technology into financial services to improve their use and delivery to customers. More importantly, it has the potential to meet the needs of those population segments that are not the main target of traditional financial services models. FinTech applications include mobile banking, mobile money, point-of-sale, e-commerce, and digital currencies. These solutions have contributed to financial inclusion, strengthening financial development, economic growth, poverty reduction, and socioeconomic development. We find that Suriname is making progress in promoting the development and use of FinTech. Still, there is room for further improvement, especially in fostering an enabling environment to harness FinTech opportunities, strengthening broader financial sector policies, addressing potential risks, promoting international collaboration, and addressing critical country-specific challenges.

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Thomas, Douglas, e Mellon Michael. Sublimation of terrestrial permafrost and the implications for ice-loss processes on Mars. Engineer Research and Development Center (U.S.), luglio 2021. http://dx.doi.org/10.21079/11681/41244.

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Sublimation of ice is rate-controlled by vapor transport away from its outer surface and may have generated landforms on Mars. In ice-cemented ground (permafrost), the lag of soil particles remaining after ice loss decreases subsequent sublimation. Varying soil-ice ratios lead to differential lag development. Here we report 52 years of sublimation measurements from a permafrost tunnel near Fairbanks, Alaska, and constrain models of sublimation, diffusion through porous soil, and lag formation. We derive the first long-term in situ effective diffusion coefficient of ice-free loess, a Mars analog soil, of 9.05 × 10⁻⁶ m² s⁻¹, ~5× larger than past theoretical studies. Exposed ice-wedge sublimation proceeds ~4× faster than predicted from analogy to heat loss by buoyant convection, a theory frequently employed in Mars studies. Our results can be used to map near-surface ice-content differences, identify surface processes controlling landform formation and morphology, and identify target landing sites for human exploration of Mars.

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Waisner, Scott, Victor Medina, Charles Ellison, Jose Mattei-Sosa, John Brasher, Jacob Lalley e Christopher Griggs. Design, construction, and testing of the PFAS Effluent Treatment System (PETS), a mobile ion exchange–based system for the treatment of per-, poly-fluorinated alkyl substances (PFAS) contaminated water. Engineer Research and Development Center (U.S.), marzo 2022. http://dx.doi.org/10.21079/11681/43823.

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Poly-,Per-fluorinated alkyl substances (PFAS) are versatile chemicals that were incorporated in a wide range of products. One of their most important use was in aqueous film-forming foams for fighting liquid fuel fires. PFAS compounds have recently been identified as potential environmental contaminants. In the United States there are hundreds of potential military sites with PFAS contamination. The ERDC designed and constructed a mobile treatment system to address small sites (250,000 gallons or less) and as a platform to field test new adsorptive media. The PFAS Effluent Treatment System (PETS) has cartridge filters to remove sediments and a granular activated carbon (GAC) media filter to remove organic compounds that might compete with PFAS in the ion exchange process, although it may also remove PFAS too. The last process is an ion exchange resin specifically designed to remove PFAS to a target level of 70 ng/L or less (equivalent to the US Environmental Protection Agency (EPA) Drinking Water Health Advisory). The system was tested at Hurlburt Field, a US Air Force facility in Florida and at Naval Support Activity (NSA) Mid-South in Millington, TN.

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Roberts, Tony, Judy Gitahi, Patrick Allam, Lawrence Oboh, Oyewole Oladapo, Gifty Appiah-Adjei, Amira Galal et al. Mapping the Supply of Surveillance Technologies to Africa: Case Studies from Nigeria, Ghana, Morocco, Malawi, and Zambia. Institute of Development Studies, settembre 2023. http://dx.doi.org/10.19088/ids.2023.027.

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African governments are spending over 1US$bn per year on digital surveillance technologies which are being used without adequate legal protections in ways that regularly violate citizens’ fundamental human rights. This report documents which companies, from which countries, are supplying which types of surveillance technology to African governments. Without this missing detail, it is impossible to adequately design measures to mitigate and overcome illegal surveillance and violations of human rights. Since the turn of the century, we have witnessed a digitalisation of surveillance that has enabled the algorithmic automation of surveillance at a scale not previously imaginable. Surveillance of citizens was once a labour and time-intensive process. This provided a practical limit to the scope and depth of state surveillance. The digitalisation of telephony has made it possible to automate the search for keywords across all mobile and internet communications. For the first time, state surveillance agencies can do two things: (a) conduct mass surveillance of all citizens’ communications, and (b) micro-target individuals for in-depth surveillance that draws together in real-time data from mobile calls, short message service (SMS), internet messaging, global positioning system (GPS) location, and financial transactions. This report was produced by qualitative analysis of open-source data in the public domain. The information presented is drawn from a diverse range of sources, including open government data sets, export licence portals, procurement notices, civil society databases of surveillance contracts, press releases from surveillance companies, academic articles, reports, and media coverage. The research is organised using a typology of five categories of surveillance technology. We did not set out to detail every technology available, every company, or every supply contract. Instead, we document the main companies and countries selling digital surveillance technologies to African governments. Rather than focus on the technical functionality distinguishing each product offering, we highlight five of the most important types of surveillance technology: internet interception, mobile interception, social media surveillance, ‘safe city’ technologies for the surveillance of public spaces, and biometric identification technologies.

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