Geostationary Satellites
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Análise dos perfis termodinâmicos da atmosfera e de parâmetros pré-convectivos obtidos pelo satélite GOES-10 / Analysis of termodynamic profiles and pre-convective parameters obtained form the GOES-10 satellite sounder data
Meteorological satellites provide a unique opportunity to obtain thermodynamic profiles in regions of the globe that do not have a dense meteorological upper air stations network, as in South America. Nowadays, the geostationary satellite GOES-10 makes the inference of temperature and mixing radio profiles every hour with a spatial resolution of 10 km over t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2009
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2. Análise dos perfis termodinâmicos da atmosfera e de parâmetros pré-convectivos obtidos pelo satélite GOES-10 / Analysis of termodynamic profiles and pre-convective parameters obtained form the GOES-10 satellite sounder data
Meteorological satellites provide a unique opportunity to obtain thermodynamic profiles in regions of the globe that do not have a dense meteorological upper air stations network, as in South America. Nowadays, the geostationary satellite GOES-10 makes the inference of temperature and mixing radio profiles every hour with a spatial resolution of 10 km over t
Publicado em: 2009
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3. Espacialização de variáveis meteorológicas combinando informações de imagens de satélite com técnicas de interpolação para o estado de Minas Gerais / Spatialization of meteorological variables combining image information with interpolation techniques for the state of Minas Gerais
As variáveis meteorológicas requeridas para aplicações no gerenciamento dos recursos hídricos e estudos agrometeorológicos e climáticos, dentre outros, são usualmente medidas em estações meteorológicas. As abrangências desses dados estão limitados às áreas próximas aos pontos onde são medidos. Para estimar variáveis meteorológicas em locai
Publicado em: 2009
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4. Estudo de algumas aquisições orbitais usando um propulsor a plasma do tipo hall com imãs permanentes. / Estudo de algumas aquisições orbitais usando um propulsor a plasma do tipo hall com imãs permanentes.
This work aims at momentum for the acquisition of orbits of artificial satellites equipped with a Hall thruster. These devices are responsible for the transformation of the electricity used in the gas ionization in kinetic energy for the acceleration of the plasma that provides thrust to the satellite. Since mid-2002, the Plasma Laboratory of the Institute o
Publicado em: 2008
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5. Morfologia e dinâmica das irregularidades ionosféricas de pequena escala e imageamento ionosférico por GPS / Morphology and dynamic of small-scale ionospheric irregularities and ionospheric imaging by GPS
The signals received from the Global Positioning System (GPS) satellites were used to study the behavior of three important geophysical parameters of the ionosphere: small-scale irregularities, their zonal drift velocities and the Total Electron Content (TEC). From the fluctuations (scintillations) in the amplitude of the GPS L1 signal (1575.42 MHz), detecte
Publicado em: 2008
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6. Utilização do módulo "creatalink" para a transmissão, em tempo real, de sinais de correção para sistemas GPS diferenciais (DGPS) / Use of creatalink module to transmit in real time corrections signals for differential GPS (DGPS) systems
GPS is a radio navigation system base on a satellite network providing 24 hours radio data to determine point coordinates and world wide coverage. The precision is in the decametric range which is not adequate to many applications. DGPS or Differential GPS is a technique used to improve this precision down to metric level adding informa-tion to the receiver.
Publicado em: 2005
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7. Electrochemical and structural study of the electrode of hydroxide of nickel modified with cerium for stabilization of the phase 945;-Ni(OH)2 / Estudo eletroquímico e estrutural do eletrodo de hidróxido de níquel modificado com cério para estabilização da fase α-Ni(OH0)2
Ni(OH)2 is widely used as main active component for positive electrodes for secondary batteries such as Ni/Cd, Ni/Zn, Ni/Fe, Ni/H2 and recently in cell of Ni/MH. These accumulators show certain characteristics and they have several applications, such as: geostationary satellites, recharge feeding of computers, portable devices. Although the electrode of hydr
Publicado em: 2005
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8. Estudo Analítico e numérico de um enlace digital de comunicação via satélite em condição orbital geo-estacionária / Analytical and numerical analysis of a digital communication geostationary satellite link.
The links of satellites are affected by propagation conditions and distortions that are generated by devices. The propagation losses as well as the passive components attenuation are very simple to analyze, but many calculations involved with the complete link demand to discover the carrier to inter-modulation ratio. This work presents an innovative set of e
Publicado em: 2004
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9. ANÁLISE DE INTERFERÊNCIAS ENVOLVENDO SISTEMAS DE COMUNICAÇÃO QUE UTILIZAM SATÉLITES NÃO-GESTACIONÁRIOS: CASO EM QUE PARCELAS DE INTERFERÊNCIA SÃO MODELADAS POR VARIÁVEIS ALEATÓRIAS / INTERFERENCE ANALYSIS INVOLVING COMMUNICATION SYSTEMS THAT UTILIZE NON-GEOSTATIONARY SATELLITES: MODELING SINGLE-ENTRY INTERFERENCE TERMS RANDOM VARIABLES
The objective of this work is to extend the use of the Analytical Method for assessing the interference involving non-geostationary satellite networks to situations where the interference entries from the various satellites in a given Constellations are modeled as statistically independent random variables. The analysis of this type of situation requires a l
Publicado em: 2000
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10. AN ANALYTICAL METHOD TO DETERMINE THE STATISTICAL BEHAVIOR OF THE INTERFERENCE GENERATED BY SATELLITE NETWORKS THAT USE NON-GEOSTATIONARY SATELLITES: EXTENDING THE METHOD TO REPEATED-TRACK SATELLITES / MÉTODO ANALÍTICO PARA A DETERMINAÇÃO DAS ESTATÍSTICAS DA INTERFERÊNCIA EM REDES DE COMUNICAÇÕES QUE UTILIZAM SATÉLITES NÃO GEOESTACIONÁRIOS: EXTENSÃO AO CASO DE SATÉLITES COM TRAJETÓRIAS REPETITIVAS
This work presents the theoretical description and implementation of an analytical method for the evaluation of the statistical behavior of the interference produced or received by elements of a non-GSO network. This method is based on the knowledge of the probability density function of the position of one of the satellites of the non-GSO constellation (ref
Publicado em: 2000
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11. DETERMINING THE STATISTICAL BEHAVIOR OF THE INTERFERENCE GENERATED BY SATELLITE NETWORKS THAT USE NON-GEOSTATIONARY SATELLITE: NUMERICAL IMPLEMENTATION OF THE ANALYTIC METHOD / DETERMINAÇÃO DO COMPORTAMENTO ESTATÍSTICO DE INTERFERÊNCIAS ENVOLVENDO REDES DE COMUNICAÇÕES QUE UTILIZAM SATÉLITES NÃO GEOESTACIONÁRIOS: IMPLEMENTAÇÃO NUMÉRICA DO MÉTODO ANALÍTICO
This thesis presents the numerical algorithm description for the implementation of the analytical approach to assess interference in environments involving NGSO satellite networks proposed in [1]. For completeness purposes it also included to analyze the interference sensitivity to system and network parameters without the reliability problems and the excess
Publicado em: 1999
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12. OTIMIZAÇÃO DE PLANOS DE FREQÜÊNCIA EM REDES DE COMUNICAÇÃO POR SATÉLITE / OPTIMIZATION OF TRANSPONDER FREQUENCY PLANS IN SATELLITE COMMUNICATION
The optimization of transponder frequency plans in satellite communication networks is extremely useful to achieve na efficient use of the geoestacionary orbit and frequency spectrum resources. Due to the recent development of satellite communication systems, the number of geostationary satellites is rapidly increasing. Thes makes the satellite angular spaci
Publicado em: 1993