Tesi sul tema "Sonar tracking"
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Walters, C. R. "An investigation into frequency tracking based on graph-theoretic partitioning". Thesis, Cranfield University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339808.
Testo completoWestman, Peter, e Mikael Andersson. "Design of behavior classifying and tracking system with sonar". Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11495.
Testo completoThe domain below the surface in maritime security is hard to monitor with conventional methods, due to the often very noisy environment. In conventional methods the measurements are thresholded in order to distinguish potential targets. This is not always a feasible way of treating measurements. In this thesis a system based on raw measurements, that are not thresholded, is presented in order to track and classify divers with an active sonar. With this system it is possible to detect and track weak targets, even with a signal to noise ratio that often goes below 0 dB.
The system in this thesis can be divided into three parts: the processing of measurements, the association of measurements to targets and the classification of targets. The processing of measurements is based on a particle filter using Track Before Detect (TBD). Two algorithms for association of measurements, Joint Probabilistic Data Association (JPDA) and Highest Probability Data Association (HPDA), have been implemented. The classification of targets is done using an assumed novel approach. The system is evaluated by doing simulations with approximately 8 hours of recorded data, where divers are present at nine different times. The simulations are done a number of times to catch The classification rate is high and the false alarm rate is low.
Undervattensdomänen är svår att övervaka i marina säkerhetssystem med sedvanliga metoder, på grund av den brusiga miljön. I traditionella metoder trösklas mätningarna för att urskilja potentiella mål. Detta är inte alltid ett godtagbart sätt att behandla mätningar på. I den här rapporten presenteras ett system baserat på behandling av rå mätdata, som inte trösklas, för att spåra och klassificera dykare med en aktiv sonar. Med detta system är det möjligt att detektera och spåra svaga mål, trots att signal till brus förhållandet ofta går under 0 dB.
Systemet i den här rapporten kan delas upp i tre delar: behandling av mätningar, association av mätningar till mål samt klassificering av mål. Behandlingen av mätningarna görs med ett partikelfilter som använder Track Before Detect (TBD). Två algoritmer för associering av mätningar, Joint Probabilistic Data Association (JPDA) och Highest Probability Data Association (HPDA), har implementerats. Klassificeringen av mål görs med en egenutvecklad metod som inte har hittats i existerande dokumentation. Systemet utvärderas genom att simuleringar görs på ungefär 8 timmar inspelad data, där dykare är närvarande vid nio olika tillfällen. Simuleringarna görs ett antal gånger för att fånga upp stokastiska beteenden. Andelen lyckade klassificeringar är hög och andelen falsklarm är låg.
Maxwell, Jason S. "A Low-cost Solution to Motion Tracking Using an Array of Sonar Sensors and an Inertial Measurement Unit". Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1248829018.
Testo completoKrout, David Wayne. "Intelligent ping sequencing for multiple target tracking in distributed sensor fields /". Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6045.
Testo completoEge, Emre. "A Comparative Study Of Tracking Algorithms In Underwater Environment Using Sonar Simulation". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608866/index.pdf.
Testo completos true state based on a time history of noisy sensor observations. In real life, the sensor data may include substantial noise. This noise can render the raw sensor data unsuitable to be used directly. Instead, we must filter the noise, preferably in an optimal manner. For land, air and surface marine vehicles, very successful filtering methods are developed. However, because of the significant differences in the underwater propagation environment and the associated differences in the corresponding sensors, the successful use of similar principles and techniques in an underwater scenario is still an active topic of research. A comparative study of the effects of the underwater environment on a number of tracking algorithms is the focus of the present thesis. The tracking algorithms inspected are: the Kalman Filter, the Extended Kalman Filter and the Particle Filter. We also investigate in particular the IMM extension to KF and EKF filters. These algorithms are tested under several underwater environment scenarios.
Ogden, George Lloyd. "Extraction of Small Boat Harmonic Signatures From Passive Sonar". PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/728.
Testo completoSmith, Duncan. "An evolutionary approach to optimising neural network predictors for passive sonar target tracking". Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/26870.
Testo completoLum, Raymond Hon Kit. "Integrated perception, modeling, and control paradigm for bistatic sonar tracking by autonomous underwater vehicles". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78195.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 357-364).
In this thesis, a fully autonomous and persistent bistatic anti-submarine warfare (ASW) surveillance solution is developed using the autonomous underwater vehicles (AUVs). The passive receivers are carried by these AUVs, and are physically separated from the cooperative active sources. These sources are assumed to be transmitting both the frequency-modulated (FM) and continuous wave (CW) sonar pulse signals. The thesis then focuses on providing novel methods for the AUVs/receivers to enhance the bistatic sonar tracking performance. Firstly, the surveillance procedure, called the Automated Perception, is developed to automatically abstract the sensed acoustical data from the passive receiver to the track report that represents the situation awareness. The procedure is executed sequentially by two algorithms: (i) the Sonar Signal Processing algorithm - built with a new dual-waveform fusion of the FM and CW signals to achieve reliable stream of contacts for improved tracking; and (ii) the Target Tracking algorithm - implemented by exploiting information and environmental adaptations to optimize tracking performance. Next, a vehicular control strategy, called the Perception-Driven Control, is devised to move the AUV in reaction to the track report provided by the Automated Perception. The thesis develops a new non-myopic and adaptive control for the vehicle. This is achieved by exploiting the predictive information and environmental rewards to optimize the future tracking performance. The formulation eventually leads to a new information-theoretic and environmental-based control. The main challenge of the surveillance solution then rests upon formulating a model that allows tracking performance to be enhanced via adaptive processing in the Automated Perception, and adaptive mobility by the Perception-Driven Control. A Unified Model is formulated in this thesis that amalgamates two models: (i) the Information-Theoretic Model - developed to define the manner at which the FM and CW acoustical, the navigational, and the environmental measurement uncertainties are propagated to the bistatic measurement uncertainties in the contacts; and (ii) the Environmental-Acoustic Model - built to predict the signal-to-noise power ratios (SNRs) of the FM and CW contacts. Explicit relationships are derived in this thesis using information theory to amalgamate these two models. Finally, an Integrated System is developed onboard each AUV that brings together all the above technologies to enhance the bistatic sonar tracking performance. The system is formulated as a closed-loop control system. This formulation provides a new Integrated Perception, Modeling, and Control Paradigm for an autonomous bistatic ASW surveillance solution using AUVs. The system is validated using the simulated data, and the real data collected from the Generic Littoral Interoperable Network Technology (GLINT) 2009 and 2010 experiments. The experiments were conducted jointly with the NATO Undersea Research Centre (NURC).
by Raymond Hon Kit Lum.
Sc.D.
Manyika, James. "An information-theoretic approach to data fusion and sensor management". Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:6e6dd2a8-1ec0-4d39-8f8b-083289756a70.
Testo completoSengun, Ermeydan Esra. "Detection And Tracking Of Dim Signals For Underwater Applications". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612213/index.pdf.
Testo completoLjung, Johnny. "Track Before Detect in Active Sonar Systems". Thesis, Uppsala universitet, Signaler och system, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447314.
Testo completoHartley, Chet A. "A computer simulation study of station keeping by an autonomous submersible using bottom-tracking sonar". Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22977.
Testo completoFor an Autonomous Underwater Vehicle to complete many operational missions, it must have the ability to maintain its position relative to the ocean floor. Maintaining station requires that the AUV be able to determine the direction and the distance displaced during a small time interval. Knowing the direction and distance traveled in a measured amount of time, the magnitude and direction of the ocean current can be calculated. Once this ocean current information is known, the AUV speed and direction can be properly adjusted to directly offset the ocean current forces. This thesis will attempt to determine, by computer simulation, if the first problem of AUV station keeping, vehicle movement direction and distance detection can be performed using bottom-tracking sonar as the AUV's only sensor. Both the problems of performing and storing successive synthetic sonar images and of determining AUV motion using frame to frame correlation of these images are investigated. (RRH)
Mathews, Sunil. "An efficient implementation of a batch-oriented, multitarget, multidimensional assignment tracking algorithm with application to passive sonar". Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5771.
Testo completoThis research investigates the use of two versions of a batch-oriented, multidimensional assignment tracking algorithm to examine target crossings that are on the order of 100 scans in duration. The simulations use outputs in one dimension (bearings only) from a passive sonar line array. Linear programming relaxation is used to solve the assignment problem for an exhaustive set of measurement-to-track N-tuple costs along the batch. The implementation of the cost evaluations used for the objective function is analyzed for efficiency. The objective function is minimized subject to certain constraints. The constraints are set up such that each measurement-to-track assignment is exclusive per scan along the batch. The algorithm is generic and can be extended to N dimensions (ND). Missing measurements are accounted for as part of the assignment model. An efficient version of the ND assignment is developed to increase the batch length for acceptable runtime performance. Batch lengths of up to 15 scans, equivalent to a 16D assignment, have been developed and tested on various levels of clutter data. Results are tested via 100-trial Monte Carlo simulations for the two algorithms as applied to the long-duration passive sonar crossing targets case with various clutter density and filter settings.
Mill, Robert William. "The application of auditory signal processing principles to the detection, tracking and association of tonal components in sonar". Thesis, University of Sheffield, 2008. http://etheses.whiterose.ac.uk/12827/.
Testo completoWijk, Olle. "Triangulation Based Fusion of Sonar Data with Application in Mobile Robot Mapping and Localization". Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3124.
Testo completoJensfelt, Patric. "Approaches to Mobile Robot Localization in Indoor Environments". Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3194.
Testo completoHamada, Ali, e Fredrik Larsson. "EastWest : Solar tracking photovoltaic panel". Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264471.
Testo completoSyftet med detta projekt var att undersöka hur effektivt det är att implementera styrning av en solpanel i en eller två axlar. För att kunna avgöra nyttan så togs det hänsyn till drivsystemet och hur mycket energi det gick åt för styrningen. Även praktiska tillämpningar kontrollerades och vilka fördelar och nackdelar som skulle erhållas. För att svara på frågeställningarna, tillverkades en prototyp som testades i en kontrollerad miljö. Genom att rotera panelen runt en axel ökar energiupptaget 26 % och för det tvåaxliga systemet 56 % jämfört med en stationär panel. Användningen av stegmotorer visade sig inte vara speciellt effektiv då det krävdes kontinuerlig strömmatning för att erhålla det motormoment som krävdes för att hålla panelen på plats.
Lawless, Colin, e Erik Kärrfelt. "Sun Following Solar Panel : Using Light Sensors to Implement Solar Tracking". Thesis, KTH, Maskinkonstruktion (Inst.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230142.
Testo completoThe purpose of this project is to investigate if it is possibleto get more energy out of a solar panel if the solarpanel is always directed towards the sun. Furthermore,two questions surrounding the plausibility of building anefficient tracking system, and the level of complexity forthe required software and mechanism will be investigated.To be able to answer these questions a prototype was built.This project consists of three major parts, hardware,software and electronics. Stepper motors were used to rotatethe solar panels and light dependent resistors (LDR)were used as light sensors.With the tracking system, the solar panels outputted48 % more energy.
Lawless, Colin, e Erik KÄRRFELT. "Sun Following Solar Panel : Using Light Sensors to Implement Solar Tracking". Thesis, KTH, Mekatronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232969.
Testo completoSyftet med detta projekt är att undersöka om det är möjligt att erhålla mer energi från en solpanel om solpanelen alltid är riktad mot solen. Vidare ska två frågor angående om det är möjligt att konstruera ett system som effektivt följer solen med ljussensorer och hur komplicerad den tillhörande mjukvaran blir besvaras. För att finna svar på dessa frågor har en prototyp skapats. Detta projekt består av tre avgörande delar, hårdvara, mjukvara och elektronik. Stegmotorer används för att rotera solpanelerna och light dependent resistor (LDR)-motstånd används som ljussensorer. Med det solspårande systemet erhölls 48 % mer energi från solpanelerna.
Perumattil, Jose Rose Mary. "The analysis of flat plate solar collector with double-axis solar tracking". Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-38932.
Testo completoCrockett, P. J. C. "Detection and tracking of solar magnetic bright points". Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546035.
Testo completoWagner, Corwin J. "Wind effects on sun tracking solar reflecting panels". Thesis, Monterey, California: Naval Postgraduate School, 2015. http://hdl.handle.net/10945/45956.
Testo completoWind loads on sun tracking solar reflector panels exposed to the atmospheric boundary layer were established through surface static pressure measurements to determine how wind affects them, specifically at the request of SPAWAR-Pacific, which has developed a custom design. A 1:8 scale model of a four-panel array was studied in the Naval Postgraduate School wind tunnel. Wind velocity, wind angle orientation, and individual panel positions, at which the highest pressure coefficient cases were anticipated, were varied. The pressure coefficients were measured by an array of Scanivalve pressure transducers with 16 pressure taps drilled into the top and bottom surfaces of each panel. Oil flow and smoke flow visualization techniques were performed to better understand the flow features that led to the greatest pressure coefficients. A parapet was included to observe the wind effects of various positions. Additionally, pressure measurements were observed using a rounded edge installed on the lead panel edges. This notion was to assist in not only minimizing wind loads, but also in determining a safe stow position of the array during high wind events. The measurements and the flow visualization studies both provided a cohesive and constructive picture of the flow. The windward panel was found to be subjected to the thrust of the wind loads in most cases, with a maximum recorded differential pressure coefficient of 3.25. However, when in combination with attaching the rounded edge to the windward panel and setting it negative five degrees, pressure coefficients were decreased by more than 70%. Parapets of the appropriate help also reduced the measured loads significantly.
Cohen, Jeremy Michael M. Eng Massachusetts Institute of Technology. "Peak power tracking for a solar buck charger". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61153.
Testo completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 91-92).
This thesis discusses the design, implementation, and testing of a buck converter with peak power tracking. The peak power tracker uses a perturb and observe algorithm to actively track the solar panel's peak power point and a global sweep algorithm accounts for startup and multiple local maxima. The tracker takes the place of the current mode loop in the converter's control scheme by providing a battery with peak charging current. A voltage mode loop is also designed to take over control from the tracker to complete the multi-loop structure. A solar panel simulator is designed to mimic the characteristics of an actual solar panel to allow careful testing of the tracking algorithms. A test circuit board is built and its operation is verified. Finally, the power extracting potential of the active tracking method from this thesis is compared to two simpler solar regulators.
by Jeremy Michael Cohen.
M.Eng.
Maples, David William. "The Solar Energy Tracker". Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/4420.
Testo completoMasters, Joel T. "TOWER-TRACKING HELIOSTAT ARRAY". DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/481.
Testo completoXiao, Weidong. "Improved control of photovoltaic interfaces". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2393.
Testo completoZhan, Yong. "Analysis of tracking error effects for the Fresnel mirror solar concentrator". Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/560271.
Testo completoDepartment of Physics and Astronomy
Mehrtash, Mostafa. "Performance evaluation of solar tracking photovoltaic systems operating in Canada". Mémoire, École de technologie supérieure, 2013. http://espace.etsmtl.ca/1138/1/MEHRTASH_Mostafa.pdf.
Testo completoSanders, Dustin R. "Maximum Power Point Tracking and Communications for Solar Powered Vehicles". Thesis, Southern Illinois University at Edwardsville, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10010780.
Testo completoThe SIUe solar car team lacks a competitive communication system. To enable the competitive edge a major upgrade to the electronics and wiring was required. A new maximum power point tracker and driver support system was developed to give them the competitive edge.
Pisanti, Cecilia. "Models for design and control of a solar-hybrid vehicle with a tracking solar roof". Doctoral thesis, Universita degli studi di Salerno, 2013. http://hdl.handle.net/10556/1212.
Testo completoOur planet faces significant challenges in the twenty-first century because energy consumption is expected to double globally during the first half of this century. Faced with increasingly constrained oil supplies, humanity must look to other sources of energy, such as solar, to help us meet the growing energy demand. A useful measure of the level of a country’s development is through its energy consumption and efficiency. Excessive fossil fuel energy use not only has caused severe and growing damage to the environment from greenhouse gas emissions and oil spills, but also has brought political crises to countries in the form of global resource conflicts and food shortages. Solar and other forms of renewable energy offer a practical, clean, and viable solution to meet our planet’s growing environmental and energy challenges. Solar radiation is the most important natural energy resource because it is a renewable, free and largely diffused source. The Sun provides the Earth with an enormous amount of energy. Naturally, the Sun has always held the attention of humanity and been the subject of worship by many cultures over the millennia, such as the Egyptians, Incans, Greeks, and Mayans, among many others. The potential of solar energy to produce heat and electricity to be supplied for our modern economies in a variety of productive activities has been widely demonstrated but not yet widely adopted around the globe due to relatively cheap fossil fuels. The main problem of this kind of energy source is that it is not constant during the day and not readily dispatched. In contrast, modern lifestyles demand a continuous and reliable supply of energy. However, there are ways to overcome these shortfalls. In chapter 1 there is a general presentation of solar irradiance and the main solar angles: global solar irradiance is composed by diffuse, reflected and direct radiation. To direct radiation the geometrical relationship between the Sun and the Earth must be known. Nowadays solar technologies are involved to industrial maturity: to capture solar energy as much as possible firstly arrays with an optimal fixed tilt have been developed, then solar tracking arrays. For many of reasons, especially energetic, environmental, economic, a big interest nowadays has been developed for hybrid vehicles, particularly hybrid electric vehicles HEV; but in recent years HSV are attracting increasing interest. The last ones use solar energy. These kind of vehicles are described in chapter 2. It must be underlined that there is a great difference between hybrid solar vehicles and solar cars: in fact solar cars now do not represent a realistic alternative for traditional cars, because they depend only on sun availability and have high costs. Instead HSV do not have problems concerning the autonomy range, because they have an electric motor and also a traditional combustion engine. However until now in literature a little interest has been given to the hybrid solar vehicles despite HEV but at the University of Salerno a prototype of HSV has been developed and another one is going to be developed. Formulating the control algorithm for determining the fuel efficient power split between two energy sources is referred to as the supervisory control or energy management problem. In chapter 3, the main control strategies, used also for the energy management of HEV, are examined. Control strategies may be classified into non-causal and causal controllers respectively. Furthermore, a second classification can be made among heuristic, optimal and sub-optimal controllers. Great importance has given to three different strategies: Dynamic Programming DP, Genetic Algorithm GA and Rule–Based strategy RB. For each one the techniques of optimizations are described. An HSV vehicle has been modeled, and for this model especially RB strategy and GA optimization have been applied to see the most convenient one to apply on HSV prototype developed at University of Salerno. So a comparison of RB strategy with the other two is shown, and its advantages and facilities are described through experimental data. In chapter 3 this comparison shows that the adoption the results obtained by the optimization through RB strategy are close to the ones obtained with the other two optimizations. So this strategy seems convenient for two main reasons: · the previous knowledge of the driving cycle is not always required; · there are not strict mathematical operations. For these reasons RB strategy has been applied: it has been shown that it is necessary to compute the mean value of power traction and to establish the value of the sun factor. P tr can be evaluated with a backward or forward strategy: · Backward: the mean value is evaluated on the previous knowledge of the data, taking the mean value of the power during a certain period; · Forward: the mean value of the power is predicted. In chapter 4 numeric and experimental results about the application of this optimization strategy have been shown. First of all fuel consumption has been computed through a program developed in MATLAB, taking driving cycle from literature: it has been demonstrated that the values of fuel consumptions computed with backward and forward strategies of power traction are not very different. Then, through experimental tests, the adoption of on-board solar energy prediction is presented and there is also the demonstration of the beneficial to select the best solution in terms of energy management. Finally the program, previously developed for a generic HSV, has been adapted to the HSV prototype developed at University of Salerno considering also experimental driving cycles: the validation of Rule–Based strategy applied on the HSV prototype is presented through experimental tests. After it has been decided to adopt RB strategy for the on- board energy management of the HSV prototype through the adaptation of the MATLAB program into a program developed in LabVIEW. In chapter 5 a moving solar roof for an Hybrid Solar Vehicle is presented, and differences between a tracking system for mobile and fixed applications are underlined. With an optimal orientation of the roof, that means when the angle of incidence between the normal to the roof and the sun ray tends to zero, there is a considerable gain of energy. The mobile solar roof has been realized as a parallel robot with three degrees of freedom. A mathematical model has been developed in MATLAB, the design has been realized through the software 3D SolidWorks, the control system had been realized at the beginning with a PLC, then with a webcam placed in the middle of the mobile roof and the control has been developed through a program realized in LabVIEW. The model of the proposed roof has been developed and validated over experimental data obtained by a small scale real prototype. The kinematic model presented has allowed the optimization of roof geometry and shape. The best orienting properties are reached with shapes approaching a circular one, and with the minimum distance between globular joints. The optimal solution has been determined by an integrated analysis of both roof and vehicle shape. The economic feasibility of this project but especially the energetic gain has been evaluated: this model has been designed to be mobile only during parking phases for two main reasons: · The HSV analyzed must be used only for a urban use, so the driving phase lasts only 1-2 hours and the largest part of the day is a parking phase; · If the solar roof is mobile also during the driving phase some aerodynamic losses and instabilities could happen. The adoption of a moving solar roof for vehicle applications can substantially enhance the energy recovered during parking phases, for a solar electric or hybrid vehicle. Moreover, this system can result particularly useful at high latitudes, where an horizontal panel would be strongly penalized by low sun height. The adoption of a moving roof can therefore extend the potential market of solar assisted vehicles. In order to maximize benefits of the mobile solar roof, the energy consumption related to its movement must be minimized, and unnecessary movements avoided. To this end, a control procedure based on the use of insulation data provided by the solar panel, information derived by a GPS module and by processing the sky images taken by a webcam has been presented. The webcam has been placed in the middle of the mobile platform of the prototype, it makes a picture of the sky; in this picture two points are signed: the center of the picture and the center of mass of the points with maximum brightness. The main idea is that the center of the picture tends to go on the center of mass of the points of maximum brightness. Through this control system it has been also valuated the best interval between two different orientations, and the result is that during the day the interval between two different orientation changes, and it is convenient to orient the roof in the middle of each intervals, that means that if it has been computed that the best interval at 9.00 a.m. is one hour, there is a bigger gain of solar energy if the roof is oriented at 9.00 a.m. with the best orientation of 9.30 a.m. until 10a.m. and so on. [edited by author]
X n.s.
Envall, Linus. "Geolocation by Light using Target Tracking". Thesis, Linköpings universitet, Reglerteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95609.
Testo completoAtoum, Ibrahim A. A. "The development of automatic and solar imaging techniques for the accurate detection, merging, verification and tracking of solar filaments". Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5774.
Testo completoNegreiros, Igor Soares. "Development of a system tracking of solar concentrator prototype linear fresnel". Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14016.
Testo completoAmid the great crisis of the energy, new methods for electric power generation, especially those do not harm the environment, are constantly sought to meet the growing need worldwide. Among them, the use of Fresnel linear concentrators becomes increasingly feasible, due to have lower cost in comparison to other types of solar concentrators. Thus, the project seeks to develop techniques that optimize use of the system where the main objective is to implement and validate the tracking system for a prototype of linear Fresnel solar concentrator, operating between approximately 7:30 and 16:30 in Fortaleza, CearÃ. For that, it used microcontrollers, sensors and motors to design a system capable of tracking Solar light system. The characterization and validation of the inductive position sensor used is also an important part of the work. To perform the tracking system, have been used a theoretical methodology for relative location of the sun, beyond the gain scheduling technique in control of employee movement. The position sensor validation have a maximum error than 0.3Â. Therefore, can consider that, with the use of the techniques employed for the achievement of system of control, the medium error obtained was about 0.06Â, making the design perform the concentration of solar rays in the absorber concentrator with a maximum deviation of 0.5Â, providing the desired reliability for system use.
Em meio Ãs grandes crises no ambiente energÃtico novos mÃtodos para geraÃÃo de energia elÃtrica, principalmente aqueles que nÃo agridem o meio ambiente, sÃo procurados constantemente para suprir a crescente necessidade mundial. Dentre eles, o uso de concentradores Solares do tipo Fresnel linear torna-se cada vez mais viÃvel, devido possuir custo inferior a outros tipos de concentradores solar. Com isso, procura-se desenvolver tÃcnicas que otimizem o uso do modelo onde o principal objetivo deste trabalho à implementar e validar o sistema de rastreamento de um protÃtipo de concentrador solar Fresnel linear, com funcionamento compreendido aproximadamente entre 7:30 e 16:30 h, na cidade de Fortaleza, CearÃ. Para tanto, utilizou-se microcontroladores, sensores e motores para projetar um sistema capaz de rastrear a luz Solar. A caracterizaÃÃo e validaÃÃo do sensor de posiÃÃo indutivo utilizado tambÃm à parte importante do trabalho. Para a realizaÃÃo do rastreamento empregou-se uma metodologia teÃrica para localizaÃÃo relativa do Sol, alÃm da tÃcnica de escalonamento de ganho no controle do movimento empregado. A validaÃÃo do sensor de posiÃÃo foi realizada encontrando-se um erro mÃximo em torno de 0,3Â. Portanto, pode-se considerar que, com a utilizaÃÃo das tÃcnicas abordadas para a realizaÃÃo do controle do sistema o erro mÃdio obtido foi cerca de 0,06Â, fazendo com que o projeto realizasse a concentraÃÃo dos raios solares no absorvedor do concentrador com um desvio mÃximo de 0.5Â, fornecendo ao sistema a confiabilidade desejada para sua utilizaÃÃo.
Vu, Han Xuan. "Track-before-detect for active sonar". Thesis, 2015. http://hdl.handle.net/2440/96821.
Testo completoThesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2015
Zhao, Shi. "Automatic underwater multiple objects detection and tracking using sonar imaging". Thesis, 2010. http://hdl.handle.net/2440/60983.
Testo completoThesis (M.Eng.Sc.) -- University of Adelaide, School of Mechanical Engineering, 2010
Zhao, Shi. "Automatic underwater multiple objects detection and tracking using sonar imaging". 2010. http://hdl.handle.net/2440/60983.
Testo completohttp://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1454839
Thesis (M.Eng.Sc.) -- University of Adelaide, School of Mechanical Engineering, 2010
Yocom, Bryan Alan. "Bayesian passive sonar tracking in the context of active-passive data fusion". Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-08-278.
Testo completotext
De, La Torre Pedro R. "iSAT: The Integrated Satellite and Acoustic Telemetry system for tracking marine megafauna". Diss., 2014. http://hdl.handle.net/10754/321817.
Testo completoEl-Jaber, MOHAMMAD. "Target Tracking in Multi-Static Active Sonar Systems Using Dynamic Programming and Hough Transform". Thesis, 2009. http://hdl.handle.net/1974/2590.
Testo completoThesis (Master, Electrical & Computer Engineering) -- Queen's University, 2009-08-07 13:21:06.869
Hwang, J. "Adaptive sampling of a discrete underwater plume using an autonomous underwater vehicle". Thesis, 2021. https://eprints.utas.edu.au/45872/2/Hwang_whole_thesis_ex_pub_mat.pdf.
Testo completoKan, Po-Chung, e 甘伯仲. "Buoyant Solar Tracking System". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/33277885877116021986.
Testo completo環球科技大學
環境資源管理所
101
Abstract This study aimed to develop a low cost buoyant solar tracking system, in order to enhance the efficiency of solar power generation. The buoyant solar tracking system contains two main modules. One is the automation photosensitive module consisting of the photosensitive element and automation control circuit of the control module; the other is buoyant module with water pumps and the leveling mechanism including buoyant balls. This design begins with the capture of sunlight by the photosensitive element, which passes over the signal to the automation module to control the water pumps, resulting in the difference of water levels in the East and West. The differential buoyancy causes the solar photovoltaic panels to synchronize with the angle of solar position, optimizing the power generation. Test results showed that the system can improve of 37.67% of the power generation of the solar cell panel.
Yeh, Pei-Yin, e 葉沛盈. "Focusing Trajectory Tracking Solar Collector". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/28595373264904649186.
Testo completo國立臺灣大學
機械工程學研究所
96
The research develops a more economizing solar tracker. By simulation sun focusing trajectory as a special curve, the design of Focusing Trajectory Tracking Solar Collector is established based on the curve shape. The system contains: GaAs solar cell, focusing trajectory mechanism, Fresnel lens, a stepping motor and its driver, photosensitive resistors, switches, and a microcontroller PIC18F4480. The following is features of the tracking solar collector. (1) Due to the design of focusing trajectory mechanism, one dimension move of the stepping motor can drive two dimension movement of the solar cell. (2)There is a Fresnel lens to concentrate light, but the motor is unnecessary to drive both lens and solar cell, just drive small and light solar cell. This design can substantially reduce power consumption of the motor. (3)Using photosensitive resistors as sensors in accordance with focusing trajectory tracking solar collector looks for a tracking logic to track the Sun.
Chen, Kuo-Hsin, e 陳國星. "Solar tracking skylight system for illumination". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/ju85q2.
Testo completo國立臺北科技大學
能源與冷凍空調工程系碩士班
99
With the increasing awareness of sustainable and green building, more and more people are concerned with the efficiency of energy use at home and at work. A solar tracking skylight illumination system, which enables us to conserve energy by producing increased interior light levels for a longer duration than normally possible, can fit to the above need and have widen been used in the indoor illumination gradually. In this study, an experimentally investigation is conducted to explore the dynamic illuminative performance of solar tracking skylight illumination system. In the first stage of this research, a tracking skylight illumination system is tried to be developed by implement. In the second stage, the experimental test apparatus is set up and the basic lighting intensity distribution of skylight illumination system will be examined. In addition, the effects of various design parameters, e.g., the material of reflective panel and diffusive panel, the sensitivity of tracking skylight illumination system and skylight condition, are also analyzed. The results show that (1) The maximum amount of deviation of this solar-tracking system was found to be up to 10° from the accurate sun path through the whole year, which results in 18% decay in lighting intensity;(2) Illumination of indoor lighting is 10% (100W) of outdoor solar radiation intensity; (3) A set of solar-tracking skylight system can save electronic power about 292 kw-hr per year.
Wang, Yen-Han, e 汪彥瀚. "Steric Focal Trajectory Tracking Solar Collector". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/37483511459909336549.
Testo completo國立臺灣大學
機械工程學研究所
98
The research develops a more robust solar tracker. Simulation shows that focusing trajectory of sun rays of four seasons form a special surface. Thus, a steric focal trajectory tracking solar collector is designed. The system contains a GaAs solar cell, a focusing trajectory mechanism, Fresnel lens, three stepping motors with their drivers, six limiting switches, and a microcontroller PIC18F4520. The tracking solar collector has the following features: (1) A Fresnel lens to concentrate light which lets the solar cell absorb more energy. The lens is kept fixed without the need to move or rotate, but instead, the solar cell with relative small size and light weight is driven by the motor. This design can reduce power consumption of the motor. (2) It can automatically find a non-circle focal point in the space. (3) Vertical design allows it to be put on the wall of a building. The efficiency of this solar cell system at noon is of about 0.21% to 0.81% . It can be compared to a system fixed on the wall which is of about 1.03% to 2.48%. The efficiency of this solar cell system at sunset is of about 1.70% to 2.47% and can be compared to a system fixed on the wall which is of about 0.52% to 0.78%. The reason is that the energy of light focused through the lens is less at noon than at sunset when the Fresnel lens is placed vertical. This system’s concentration factor is 507, so it is capable of decreasing 99.8 percent of the solar cell’s area to achieve comparable system efficiency and therefore, the cost of this system can be reduced.
Pan, Xuan-An, e 潘宣安. "Solar Tracking System Using Fresnel Lens". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/21940913472890711743.
Testo completo環球科技大學
環境資源管理所
102
Renewable energy has become an important part of the global energy structure, under the pressure of greenhouse gas (GHGs) reduction. Solar tracking system is especially important. However, there is still room for improvement for the collimator used in the closed-loop tracking system. Therefore, this study aims to design a simple dual-axis tracking device, which consists of a collimator made of Fresnel lens and optic fiber that links to the control units. Our discoveries include 1. The use of one spiral and one linear Fresnel lens turns the incoming light into a narrow stripe, which is totally different from a dot or spot found in patents and literature. 2. The front end of the optic fiber is placed where the stripe is and the rear end is linked to the light detecting resistors (LDRs) and control units; thus, and contamination and ageing due to exposure of the LDRs to the exterior environment is prevented. 3. Modulation of the device helps the maintenance work later. 4. The field measurements show that our device can achieve the tracking precision within three degrees; under a sunny day, the power generation can be increased up to 37.4% compared with fixed solar panels. Our suggestions include 1. To develop customized Fresnel lens in order to reduce the size of the collimator. 2. To integrate with automation circuit or other methods to improve precision that a low concentration photovoltaic (LCPV) system requires.
Huang, Yan-Wei, e 黃彥瑋. "A Magnetically Propelled Solar Tracking Device". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/71493069429425928955.
Testo completo國立高雄應用科技大學
電機工程系
99
Few solar energy collecting devices now available are satisfactory in performance ; due to the capability for tracking the sun is limited to its fixed position, which decreases the efficiency in energy use, and extra expense is cost if a motor-propelled device is installed. This research presents a magnet-propelled solar tracking device, in which the characteristic of magnet and circuit theory is applied. This device will increase the efficiency in solar cell use and reduce waste during sun tracking.
Chang, Cheng-Yu, e 章正裕. "Patent Analysis of Solar Tracking Technology". Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5311042%22.&searchmode=basic.
Testo completo國立中興大學
機械工程學系所
107
How to improve the photoelectric conversion efficiency of solar cells and the solar tracking technology, are very important for technological development of solar power generation. About patent analysis in solar energy applications, there are many researches on solar cells more than solar tracking technology. According to searches、integrates and analyzes from the patents of solar tracking technology, the development and design of the solar tracking system is quite actively, but development pace of the maximum power point tracking rule and the the solar tracking mechanism are slowing down.Wherein, some patents mention that the solar tracking can be implemented without electric motors, and to achieve energy saving and environmental protection. Patent qualitative analysis is also used to analyzes a patent case in this paper, this is much different from the current patent analysis model based on quantitative analysis.
Liu, Guan-Hui, e 劉冠輝. "Fuzzy Controller Design of Maximum Power Point Tracking of Solar Module and Implementation of Solar Tracking System". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4pgj4q.
Testo completo國立交通大學
電控工程研究所
105
MPPT technique is often used in PV systems to solve low efficiency problem in energy conversion which is deeply affected by surroundings. In MPPT, methods based on the concept of P&O are very popular since their algorithms are simple and easy to implement. However, this kind of methods has a slower response and often encounters severe oscillation during steady status. Such oscillation causes the average output power level deviated from MPP and makes the voltage chattering around MPP. Therefore, this thesis proposes a FLC method to improve the above shortcomings. Simulation results show that the FLC not only has a fast response, but also eliminates the oscillation to keep the output power steady and smooth the voltage without chattering. Similar to the simulation, the experimental results show that the FLC can fast drive the system to MPP in 5 seconds and highly reduce the oscillation so that the ratio of voltage chattering is below 1%. In addition, this thesis uses the compass sensor and solar trajectory to set up a dual-axis solar tracking system. A simple sundial used to check the angle between the solar panel and sunlight is less than 5 degrees in most of the day, which implies a good performance of solar tracking.
Edgar, Ross. "Double-Layer Orthogonal-Offset Platforms in fluid and insolation environments". Phd thesis, 2018. http://hdl.handle.net/1885/141393.
Testo completoNguyen, Vu Lan, e 藍古彥. "A Novel Design of Solar Dryer with Solar Tracking System". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/42538435598731731542.
Testo completo崑山科技大學
機械工程研究所
96
In order to ameliorate available solar dryer systems and reduce disadvantagescoming from normal structures, a new design of solar dryer system has been investigated in Mechanical Engineering Department of Kun Shan University of Technology, Taiwan - R.O.C. The system only consists of a collector - chamber and a rotatable reflector which are designed for drying food products. Performance characteristic of the new design shows a high ability of being used by customers for its better drying parameter values compared to those of previous systems. It has been successfully tested in unload mode. Experiments have been performed to investigate the performance evaluation & drying behavior of the system. In comparison with an available solar drying system in Kun Shan University, this new solar dryer is offering a range of temperature closer to desired temperature of specific products (with the same air mass going through chamber) which leads to shorter time of drying. Besides, new structure also helps to solve some disadvantages of previous one such as heat loss, working period, troubles caused by dust in air …