Autonomous Vehicles
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Hardware in the loop simulation applied to semi-autonomous underwater vehicles. / Simulação com hardware in the loop aplicada a veículos submarinos semi-autônomos.
Unmanned Underwater Vehicles (UUVs) have many commercial, military, and scientific applications because of their potential capabilities and significant costperformance improvements over traditional means of obtaining valuable underwater information The development of a reliable sampling and testing platform for these vehicles requires a thorough system desig
Publicado em: 2008
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14. Fuller Phenomenon in optimal control problems: minimum time path of autonomous underwater vehicles. / Fenômeno Fuller em problemas de controle ótimo: trajetórias em tempo mínino de veículos autônomos subaquáticos
As equações do modelo bidimensional de veículos autônomos subaquáticos fornecem um exemplo de sistema de controle não linear com o qual podemos ilustrar propriedades da teoria de controle ótimo. Apresentamos, sistematicamente, como os conceitos de formalismo hamiltoniano e teoria de Lie aparecem de forma natural neste contexto. Para tanto, estudamos b
Publicado em: 2008
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15. Geração de trajetórias para veículos aéreos autônomos não-tripulados
In this work a study on the problem of the trajectory generation for unmanned aerial vehicles is carried through. The main objective is to provide tools of path planning for aerial robots, taking into account some of its main physical constraints of movement. For this, some of the more used techniques for motion planning of grounded robots are argued initial
Publicado em: 2008
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16. Modelagem e identificação de parâmetros hidrodinâmicos de um veículo robótico submarino. / Modelling and Identification of hydrodynamic parameters of an underwater robotic vehicle.
In this work, a procedure for experimental identification of hydrodynamic coefficients of unmanned underwater vehicles is presented. At first, the development of a testbed for research on dynamics, control, and navigation of underwater vehicles is presented. This experimental platform includes: 1) a open-frame semi-autonomous unmanned underwater vehicle name
Publicado em: 2008
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17. Using augmented state Kalman filter to localize multi autonomous underwater vehicles
The present paper describes a system for the construction of visual maps ("mosaics") and motion estimation for a set of AUVs (Autonomous Underwater Vehicles). Robots are equipped with down-looking camera which is used to estimate their motion with respect to the seafloor and built an online mosaic. As the mosaic increases in size, a systematic bias is introd
Journal of the Brazilian Computer Society. Publicado em: 2007-12
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18. Autonomous robot s navigation based on monocular vision / Navegação de robos autonomos baseada em monovisão
Neste trabalho apresentamos um sistema autônomo baseado em monovisão, aplicado ao controle de um robô móvel em tarefas de navegação por ambientes desconhecidos. Para o cumprimento de tarefas de navegação, o sistema não possui conhecimento inicial sobre o ambiente, tendo como fonte primária de informações, dados oriundos do sistema de visão. Os m
Publicado em: 2007
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19. Estimação de posição e quantificação de erro utilizando geometria epipolar entre imagens. / Position estimation and error quantification using epipolar geometry between images.
Position estimation is the direct result of scene reconstruction, one of computer visions fields. It is also an important information for the control of mechanical systems - specially the autonomous robotic systems. As an engineering application, those systemsperformance must be evaluated in terms of efficiency and effectiveness, measured by processing costs
Publicado em: 2007
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20. Image and data telemetry for an autonomous water quality monitoring platform / Telemetria de dados e imagens para plataforma autônoma para coleta de dados hidrológicos
The data acquisition of the water chemical and physical variables in lakes and reservoirs is of extreme importance. Monitoring the quality of water supplied and consumed in our cities we are protecting the most valuable of our natural resources, and consequently our own lifes. Monitoring data quality, still in our days, is done in a conventional and hard man
Publicado em: 2006
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21. Desenvolvimento da infra-estrutura embarcada do projeto AURORA
Unmanned semi-autonomous aerial vehicles present a great and unexplored potential in aerial inspection and research, collecting data &om the environment. Such vehicles allow the user to define the region that must be monitored, data spatial and temporal resolution in which the data must be acquired, and the most adequate type of sensor for each kind of mlSSl
Publicado em: 2001
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22. Desenvolvimento de um navegador autônomo, usando GPS, aplicado ao controle autônomo de órbita. / Autonomous orbit navigator development, using GPS, applied to autonomous orbit control.
The appearance of modern global positioning systems motivated the study and development of precise and robust systems for autonomous orbit determination of artificial satellites. These systems maintain, independently from human intervention from the ground, a precise knowledge of the satellite orbital state, through the processing of the information, autonom
Publicado em: 2001
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23. Grupos neurais e sistemas nebulosos : aplicação a navegação autonoma
In this work a seIf organizing, neurofuzzy control architecture for a class of autonomous vehicles navigation is presented. The aim is to find target positions, without colliding with obstacles of an unknown environment. The architecture uses neural networks and fuzzy systems together with the theory of neuronal group seIection to learn navigation skills. Ne
Publicado em: 1996
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24. Replication of flock house virus RNAs from primary transcripts made in cells by RNA polymerase II.
To develop vector systems that combine high transcription activity with biologically safe delivery vehicles, we have explored the use of RNA replication to amplify mRNAs, by using flock house virus (FHV) as a model system. The FHV RNA replicase is encoded in the larger of the two segments that comprise the viral positive-sense RNA genome. A cDNA copy of this