Position Estimation
Mostrando 25-36 de 54 artigos, teses e dissertações.
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25. Localização de usuários usando o sistema celular. / Users localization using cellular system.
The mobile location technique using the cellular system received a special attention from the telecommunication manufacturers and operators, regarding the need of accomplishing the established demands by the emergency service calls and other commercial ones. This study analyzes the main location methods proposed in the literature, including, in each one, the
Publicado em: 2007
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26. Adaptive techniques applied to offshore dynamic positioning systems
Dynamic positioning systems (DPS) comprise the deployment of active propulsion to maintain the position and heading of a vessel. Several sensors are used to measure the actual position of the floating body, while a control algorithm is responsible for the calculation of forces to be delivered by each propeller, in order to counteract all environmental forces
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09
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27. Ultrasound and clinical fetal weight estimation / "Estimativa ultra-sonográfica e clínica do peso fetal"
This study was designed to evaluate the accuracy of ultrasound and clinical fetal weight estimation; evaluate maternal and/or fetal factors that could interfere in ultrasound estimation of fetal weight and, compare the accuracy of ultrasound versus clinical fetal weight estimations. 212 estimation of fetal was performed within 24 hours to delivery. The mater
Publicado em: 2006
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28. Estimação do fluxo multidirecional de pedestres em ambientes abertos e não restritos, pela análise de seqüências de imagens digitais / Pedestrians multi-directional flow estimation in opening and non-restricted environments by the analysis of digital images sequences
The problem in counting people in restricted area is of great importance in planning the services offered by cinemas, malls and bus companies and also for controlling pedestrians traffic in urban areas. These applications have evinced the need for developing reliable real time systems capable of counting pedestrians in regions of interest. This work presents
Publicado em: 2005
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29. ANISOTROPY INFLUENCE ON NORMAL MOVEOUT CORRECTION IN VTI SEISMIC DATA AND VELOCITY ANALYSIS USINGGRADIENT DESCENDENT / INFLUÊNCIA DA ANISOTROPIA VTI NA CORREÇÃO DE SOBRETEMPO NORMAL EM DADOS SÍSMICOS E ANÁLISE DE VELOCIDADE POR GRADIENTE DESCENDENTE
This work quantifies the error created during seismic processing when isotropic approach is used to normal moveout correction and velocity analysis and the seismic data is anisotropic. This quantification is made by performing velocity analysis in several synthetic seismograms built from a simple (but realistic) geological model with some horizontal layers,
Publicado em: 2005
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30. AJUSTAMENTO E CONTROLES DE QUALIDADE DAS LINHAS POLIGONAIS / LEAST-SQUARES ADJUSTMENT METHOD AND QUALITY CONTROLS OF TRAVERSES
Brazil is a country of great dimension that still holds unexplored areas of little population nowadays. Actually these lands are state-owned, but they have been appropriated as a private property, especially in the Amazon basin. The need for a governmental more effective territorial management was formally implemented through the establishment of a geodetic
Publicado em: 2005
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31. Self-tuned vehicle parameters detection and estimation from vÃdeo sequences for traffic incident management.
This work proposes and compares three algorithms for vehicle detection, composed of two main stages, preprocess and process. The first will proceed with the selection of the region of interest (ROI) and the background learning phase. The ROI is a narrow and transversal-to-lane rectangular area wherein detection is achieved, its dimensions provides low proces
Publicado em: 2005
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32. RADIOLOCALIZAÇÃO DE TERMINAIS DE COMUNICAÇÕES MÓVEIS / RADIOLOCATION OF MOBILE COMMUNICATIONS TERMINALS
This work addresses the radiolocation problem of a moving terminal in a cellular mobile communications environment. New alternatives are developed for position estimation, assuming that the Time of Arrival (ToA) measurements obtained from radio link are corrupted by additive noise and have positive mean error during random periods of time due to the non-line
Publicado em: 2004
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33. A new robotic drive joint friction compensation mechanism using neural networks
The knowledge of realistic dynamic models to robotic actuators would be of great aid in the synthesis of control laws to robot manipulators, mainly in cases of great precision robotic or even for manipulators with flexible links. In this paper we present a training scheme and propose a structure of neural network (NN) to learn the friction torque of a geared
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-04
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34. OTIMIZAÇÃO DE ALTERNATIVAS PARA DESENVOLVIMENTO DE CAMPO DE PETRÓLEO UTILIZANDO COMPUTAÇÃO EVOLUCIONÁRIA / THE OPTIMIZATION OF PETROLEUM FIELD EXPLORATION ALTERNATIVES USING EVOLUTIONARY COMPUTATION
This dissertation investigates a system based in genetic algorithms and cultural algorithms, applied to the development process of a petroleum field. The development of a petroleum field consists in the placement of wells in an already known and delimited petroleum reservoir, which allows maximizing the Net Present Value. A placement of wells defines the qua
Publicado em: 2003
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35. Soybean canopy [Glycine max (L.), Merril photosynthetic pigments estimation by measns of spectral reflectance / Utilização da reflectância espectral para a estimativa de pigmentos fotossintéticos em dosséis de soja [Gycine Max (.L), Merril]
Photosynthetic pigments are essential for plant development, because they are responsible for the incident solar energy absorption used in photosynthesis. Individually quantifying these pigments in great extensions of agricultural crops has been made possible by hyperspectral remote sensing development and these information can be used to produce a more accu
Publicado em: 2002
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36. Determinação e manobras autônomas de órbitas de satélites artificiais em tempo real usando medidas GPS de uma frequência / Autonomous artificial satellite orbit determination and maneuver in real-time using single frequency GPS measurements
Um algoritmo simplificado e compacto com baixo custo computacional fornecendo precisão em torno de dezenas de metros para determinação de órbita de satélites artificiais em tempo real e a bordo, usando o Sistema de Posicionamento Global (GPS), é desenvolvido neste trabalho. O vetor de estado, composto da posição, velocidade, tendência, deriva e taxa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/11/2000