Artificial Satellite
Mostrando 1-12 de 76 artigos, teses e dissertações.
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1. MODELING AND SIMULATING LAND USE/COVER CHANGE USING ARTIFICIAL NEURAL NETWORK FROM REMOTELY SENSING DATA
ABSTRACT Increasing population, mobility and requirements of human beings have significant effects on the dynamics of land use and land cover. Today, these impacts need to be understood and analyzed for the applicability of decision support systems, which are an important tool in the management of natural resources, urban and rural areas. The aim of this stu
CERNE. Publicado em: 09/09/2019
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2. Simulation and Prediction for a Satellite Temperature Sensors Based on Artificial Neural Network
ABSTRACT: Spacecrafts in space environment are exposed to several kinds of thermal sources such as radiation, albedo and emitted IR from the earth. The thermal control subsystem in spacecraft is used to keep all parts operating within allowable temperature ranges. A failure in one or many temperature sensors could lead to abnormal operation. Consequently, a
J. Aerosp. Technol. Manag.. Publicado em: 26/08/2019
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3. Evaluation of deciduous broadleaf forests mountain using satellite data using neural network method near Caspian Sea in North of Iran
ABSTRACT During the recent decades, deciduous forests have been molested by human intervention. Easy access, abundance and diversity of valuable forest products have led to increased population density, creating new residential areas and deforestation activities. Revealing changes is one of the fundamental methods in management and assessment of natural reso
An. Acad. Bras. Ciênc.. Publicado em: 2016-12
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4. Yeast diversity associated to sediments and water from two Colombian artificial lakes
In Colombia, knowledge of the yeast and yeast-like fungi community is limited because most studies have focused on species with clinical importance. Sediments and water represent important habitats for the study of yeast diversity, especially for yeast species with industrial, biotechnological, and bioremediation potential. The main purpose of this study was
Braz. J. Microbiol.. Publicado em: 18/04/2014
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5. Attitude Control of a Satellite by Using Digital Signal Processing
Abstract: This article has discussed the development of a three-axis attitude digital controller for an artificial satellite using a digital signal processor. The main motivation of this study is the attitude control system of the satellite Multi-Mission Platform, developed by the Brazilian National Institute for Space Research for application in different s
J. Aerosp. Technol. Manag.. Publicado em: 2012-03
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6. Neuro estimador para o fluxo de gases entre a superfície terrestre e a atmosfera / A neuro estimator for the flux of gases between the surface land and the atmosphere
Studies show that global warming may be irreversible in the medium or long term, and is a major cause of air pollution. However, this framework can be reversed or mitigated by estimating the amount of emissions, since the mapping of pollution sources could facilitate the work of public authorities in relation to environmental monitoring and the development o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2011
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7. Uma estratégia baseada em algoritmos de mineração de dados para validar plano de operação de voo a partir de predições de estados dos satélites do INPE / A strategy based on data mining algorithms to validate flight operational plan from predictions for the operational states of INPE satellites
A perspectiva de múltiplos lançamentos e o aumento da demanda de satélites em operação de acordo com o programa espacial do INPE, poderia tornar inviável uma análise criteriosa dos planos de voo que controlam satélites antes da execução real. Em função deste panorama, propõe-se uma solução para avançar na melhoria da segurança no planejament
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/05/2011
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8. Estudo de modelos e condições iniciais da geração a priori de detritos espaciais e sua propagação orbital / Study of models and initial conditions of a priori generation of space debris and their orbital propagation
Currently, it is estimated that there are hundreds of thousands of space debris, of various sizes, around the Earth. The space debris, also known as orbital debris, can remain in orbit with other bodies for a long time; and can cause risks of collision, including with space vehicles still in operation. In addition, there are risks of potential accidents by r
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/04/2011
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9. 15:1 Resonance effects on the orbital motion of artificial satellites
Abstract The motion of an artificial satellite is studied considering geopotential perturbations and resonances between the frequencies of the mean orbital motion and the Earth rotational motion. The behavior of the satellite motion is analyzed in the neighborhood of the resonances 15:1. A suitable sequence of canonical transformations reduces the system of
J. Aerosp. Technol. Manag.. Publicado em: 2011-12
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10. 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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11. Controle de atitude de satélites artificiais utilizando um processador digital de sinais / Attitude control of satellites using a digital signal processor
This work deals with the development and implementation of an attitude control system for an artificial satellite using a Digital Signal Processor (DSP). The dissertation presents a complete study of the attitude movement modeling and control for the continuous time systems case, considering the Linear Quadratic Regulator (LQR) and Linear Quadratic Gaussian
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2010
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12. DinÃmica Geoambiental do Sistema HÃdrico MaceiÃ/Papicu / Dynamic Geoenvironmental System Hydride Maceià / Papicu
This research aims to analyse the geo-environmental features of the MaceiÃ/ Papicu Hydrical System relating the dynamic in the natural landscape to the human aspects. The survey is based on the process of degradation from occupation considering the changes and their consequences to the environment. By means of the visual interpretation of the AUMEF 1978 air
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/07/2010