Satellite Tracking
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. A Precise Algorithm for Computing Sun Position on a Satellite
ABSTRACT: To meet the high precision sun tracking needs of a space deployable membrane solar concentrator and other equipment, an existing algorithm for accurately computing the sun position is improved. Firstly, compared with other theories, the VSOP (variation seculaires des orbits planetaires) 87 theory is selected and adopted to obtain the sun position i
J. Aerosp. Technol. Manag.. Publicado em: 26/08/2019
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2. Hybrid Geoid Model: Theory and Application in Brazil
Determination of the ellipsoidal height by Global Navigation Satellite Systems (GNSS) is becoming better known and used for purposes of leveling with the aid of geoid models. However, the disadvantage of this method is the quality of the geoid models, which degrade heights and limit the application of the method. In order to provide better quality in transfo
An. Acad. Bras. Ciênc.. Publicado em: 2017-09
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3. GPS-Dependent Systems: Vulnerabilities to Electromagnetic Attacks
ABSTRACT The GPS is a satellite navigation system that provides location and time information. Such a system currently supports critical applications for military, civil and commercial users worldwide and is accessible to any operator by using a single GPS receiver. However, although being too dependent on GPS signals, just a few of these applications presen
J. Aerosp. Technol. Manag.. Publicado em: 2016-12
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4. Contribuição dos Distúrbios Ondulatórios de Leste para a chuva no Leste do Nordeste do Brasil: evolução sinótica média e simulações numéricas / Easterly Waves contribution for the eastern Northeast Brazil precipitation: mean synoptic evolution and numerical simulations
This study purpose was to verify the contribution of Easterly Wave Disturbances (EWDs) in the observed precipitation over the eastern part of Northeast Brazil (ENEB) during rainy season (AMJJ) and evaluate seasonal rainfall forecasts from RegCM3 (Regional Climate Model version 3). For the EWDs subjective identification it was used infrared satellite images a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/06/2011
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5. Características físicas dos sistemas convectivos de mesoescala que afetaram o Rio Grande do Sul no período de 2004 a 2008
Neste trabalho, utilizando a técnica ForTrACC (Forecasting and Tracking of Active Cloud Clusters ), foram estudadas, para o período de 2004 a 2008,as características físicas sazonais dos Sistemas Convectivos de Mesoescala (SCM) cuja gênese e manutenção ocorreram ao sul de 20ºS, no qual apresentaram ciclo devida de no mínimo 6 h, tiveram nascimento e
Revista Brasileira de Geofísica. Publicado em: 2011-06
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6. Closed balls for interpolating quasi-polynomials
The classic interpolation problem asks for polynomials to fit a set of given data. In this paper, quasi-polynomials are considered as interpolating functions passing through a set of spatial points. Existence and uniqueness is obtained by means of generalized Vandermonde determinants. By means of several estimates related to these determinants, we are also a
Computational & Applied Mathematics. Publicado em: 2011
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7. Citogenética clássica e molecular em peixes neotropicais. Estudos comparativos entre bacias hidrográficas com ênfase em região de transposição de rio
Basic and molecular cytogenetic studies were carried out in a few fish species from family Parodontidae: Apareiodon ibitiensis, A. piracicabae, A. affinis, A. vladii, Apareiodon sp. Parodon nasus and Parodon hilarii. All were collected in distinct hydrographic basins, with emphasis in a river transposition area, more specifically of the Piumhi River. Apareio
Publicado em: 2009
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8. Sistema de previsão imediata da precipitação: o hydrotrack / A rainfall nowcasting system: the hydrotrack
The knowledge of convective system evolution is of fundamental importance for understanding weather and climate, particularly in the tropics, and it is essential to improve forecasting of these systems to reduce vulnerability to extreme weather damage. The identification of predictor parameters of the evolution of convective system, based on its previous evo
Publicado em: 2008
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9. Análise do comportamento dinâmico da pesca profunda de emalhe no Brasil através da aplicação da tecnologia de monitoramento de embarcações via satélite e de modelos de forrageio ótimo
Recentemente um número crescente de estudos científicos abordando vários aspectos das pescarias comerciais tem sido desenvolvido com o uso do sistema de rastreamento via satélite (Vessel Monitoring System VMS). Entre eles podese incluir o estudo do comportamento das frotas e das estratégias espaçotemporais escolhidas para a exploração de recursos-alv
Publicado em: 2008
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10. Controles monovariáveis e multivariáveis aplicados a sistemas aeroespaciais fracamente ou fortemente acoplados / Monovariable and multivariable controls applied to weakly or strongly coupled aerospace systems
This work intends to study and compare two Classical (Single Input Single Output) Control design methods and three Modern (Multiple Input Multiple Output) Control design methods applied to weakly or heavily coupled aerospace systems. This work has as first application the Multi-Mission Platform - MMP currently under development at INPE. The models are develo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2006
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11. Aplicação da tecnologia de agentes de planejamento em operações de satélites / Applying the planning agent tecnology in satellite operations
Research for automatic solutions for space operations is a real need for all space agencies in order to reduce space mission costs. Nowadays, a significant parcel of satellite operation activities at the National Institute for Space Research (INPE) is still performed manually. Finding automated alternatives for the satellite operation activities at INPE is a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/03/2006
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12. Estudo comparativo de técnicas de controle de atitude em três eixos para satélites artificiais / Comparative study of three axes attitude control techniques for artificial satellites
Neste trabalho propõe-se um estudo sobre técnicas de controle de atitude para satélites estabilizados em três eixos e, através da modelagem e simulação computacional, analisar, comparar e fazer um estudo de alternativas/viabilidade de sistemas de controle de atitude (ACS) em três eixos, com base nos requisitos de missões espaciais. Para o estudo de
Publicado em: 2005