Ephemeris
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. A NOVEL MODEL FOR ORIENTATION OF LINEAR OPTICAL SATELLITE IMAGES BASED IN THE ADAPTATION OF THE ORBIT-ATTITUDE MODEL
Abstract In this paper a novel model to orient a pushbroom linear optical satellite image is proposed. This one is based in the adaptation of the Orbit-Attitude model for use of the Modified UCL Kepler platform model. It has only the components of satellite position and velocity as unknowns. This implies not only the reduction of unknowns but also the elimin
Bol. Ciênc. Geod.. Publicado em: 14/10/2019
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2. Orbit determination modeling analysis by GPS including perturbations due to geopotential coefficients of high degree and order, solar radiation pressure and luni-solar attraction
Abstract The purpose of this paper was to analyze the modeling of an artificial satellite orbit, using signals of the GPS constellation and least squares algorithms as the method of estimation, with the aim of analyzing the performance of the orbit estimation process. One pursues to verify how differences of modeling can affect the final accuracy of orbit de
J. Aerosp. Technol. Manag.. Publicado em: 2011-04
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3. De Horácio a Drummond, o tempo dispara; de Drummond a Horácio, o tempo repara
The purpose of this dissertation is to demonstrate as suggested by the title, that Carlos Drummond de Andrade in his poetry finds in the western Lyrical Poetry tradition some elements and brings them to his poetic works. Considering he was a modern poet and a modernist it was expected he should oppose any past or classical influence. Horace#s works are the s
Publicado em: 2008
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4. Determinação de órbita e manobras utilizando GPS e motor com baixo empuxo / Orbit determination and autonomous maneuver using GPS and low thrust
The Global Positioning System (GPS) is a satellite navigation system that allows the users to determine 3D positioning and the time with high precision. Its main purposes are: aid to radionavigation in three dimensions with high precision positioning, navigation in real time, global coverage and quick acquisition of data sent by the GPS satellites. In this w
Publicado em: 2008
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5. Orbit determination and autonomous maneuver using GPS and low thrust / Determinação de órbita e manobras utilizando GPS e motor com baixo empuxo
O Sistema de Posicionamento Global (GPS) é um sistema de navegação por satélites que permite determinar o posicionamento tridimensional e tempo com alta precisão. Seus principais objetivos são: auxílio a radionavegação, navegação em tempo real, cobertura global e rápida aquisição de dados enviados pelos satélites GPS. Propõe-se neste trabalho
Publicado em: 2008
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6. Orbit determination of artificial satellites in real time using gps navigation solution / Determinação de órbitas de satélites artificiais em tempo real através da solução de navegação de GPS
The Global Positioning System (GPS) is a satellite navigation system that allows the users to determine 3D positioning and the time with high precision. Its main purposes are: aid to radionavigation in three dimensions with high precision positioning, navigation in real time, global coverage and quick acquisition of data sent by the GPS satellites. It is pro
Publicado em: 2004
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7. Determinação de órbitas de satélites artificiais em tempo real através da solução de navegação de GPS / Orbit determination of artificial satellites in real time using gps navigation solution
O Sistema de Posicionamento Global (GPS) é um sistema de navegação por satélites que permite determinar o posicionamento tridimensional e tempo com alta precisão. Seus principais objetivos são: auxílio a radionavegação, navegação em tempo real, cobertura global e rápida aquisição de dados enviados pelos satélites GPS. Propõe-se neste trabalho
Publicado em: 2004
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8. Using the GPS system to estimate the ionospheric refraction in Brazil. / O sistema GPS como ferramenta para avaliação da refração ionosférica no Brasil.
Since the US president decided to turn off the selective availability (SA) one of the biggest error in the GPS system has been the ionosphere refraction. The refraction effect on GPS signals are: delay for the code and an advance for the phase. In the equatorial region, where Brazil is, the refraction presents the biggest variations that are caused by the so
Publicado em: 2002
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9. Analyses of strategies for processing of geodetic networks with the global positioning system - GPS / Análise de estratégias para processamento de redes geodésicas com o sistema de posicionamento global - GPS
O presente trabalho consiste de apresentação de metodologia para estudo, elaboração e análise de estratégias para processamento de observáveis GPS, para a constituição de redes geodésicas. No desenvolvimento deste trabalho foram utilizados os dados observados da rede geodésica do Estado de São Paulo, concluída em 1994. Esta rede é constituída
Publicado em: 2000
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10. Correcao geometrica de imagens SPOT com uso de um modelo digital de elevacao / Geometric correction of SPOT imagery with the use of a digital elevation model
This work describes a theoretical and pratical methodology for geometric correction of satellite imagery including effects of relief. The methodology present here is applicable over the unfavourable situations, such as images obtained in lateral view with large inclination angle and pronounced height differences. The images already corrected must be supperpo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/11/1989
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11. Correcao geometrica de imagens SPOT com uso de um modelo digital de elevacao / Geometric correction of SPOT imagery with the use of a digital elevation model
This work describes a theoretical and pratical methodology for geometric correction of satellite imagery including effects of relief. The methodology present here is applicable over the unfavourable situations, such as images obtained in lateral view with large inclination angle and pronounced height differences. The images already corrected must be supperpo
Publicado em: 1989