Geopotential
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. ON THE RECOVERY OF TEMPORAL VARIATIONS OF GEOID HEIGHTS DETERMINED WITH THE USE OF GGMS BASED ON SST-HL DATA FROM NON-DEDICATED GRAVITY SATELLITE MISSIONS
Abstract Over 15 years the Gravity Recovery and Climate Experiment (GRACE) had considerably contributed to the determination of temporal variations of geoid heights. In May 2018, GRACE Follow-On (GRACE-FO) was launched. The aim of this contribution is to assess the suitability of data from non-dedicated gravity satellite missions (N-DGSMs) for the determinat
Bol. Ciênc. Geod.. Publicado em: 14/10/2019
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2. PHYSICAL CONNECTION BETWEEN BVRF SEGMENTS BASED ON LEVELING ASSOCIATED WITH GRAVIMETRY
Resumo Considerando os esforços no estabelecimento de Sistemas de Referência Globais vinculados ao geopotencial, buscam-se novas alternativas para abordar os problemas apresentados nas redes verticais clássicas nacionais. A Rede Vertical de Referência do Brasil (RVRB) foi materializada em dois segmentos distintos, com origens independentes (marégrafos d
Bol. Ciênc. Geod.. Publicado em: 18/04/2019
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3. 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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4. 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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5. Study of the atmospheric and oceanic conditions in the southweast atlantic and its relation with the Brazilian sardine catch extremes / Estudo das condições atmosféricas e oceânicas do atlântico sudoeste e suas associações com extremos de captura da sardinha-verdadeira
The Brazilian Sardine is an important fishing resource for the country, with restricted occurrence in the Southeast Brazilian Bight (SBB). Landing records of this species shows years of high capture, as in 1973 with 225 thousand tons and the minimum in 2000 with 20 thousand tons. In this work was studied the oceanic and atmospheric characteristics of the mos
Publicado em: 2009
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6. 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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7. Variabilidade atmosférica associada a casos extremos de precipitação na Região Sudeste do Brasil / Atmospheric variability associated to estreme precipitation events over southeast region of Brazil
The most severe climate impacts on the society occur due to climate variability and extreme precipitation events. Therefore, their study on various space and time scales are important to determine, in details, the related aspects and thus to provide information to analyze their representations in numerical forecast models. The goal of this work is to study v
Publicado em: 2008
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8. Aspectos metodológicos del uso del análisis de componentes principales en campos de anomalias de altura geopotencial en el sur de sudamerica
This paper presents a discussion of methodological aspects of the use of the principal component analysis (PCA) to verify its efficacy synthesis for the daily 1000 and 500 hPa anomalies of geopotential height fields of the October to May 1979-2001 NCEP reanalyses II in southern South America. This analysis was performed in order to obtain a representative da
Revista Brasileira de Meteorologia. Publicado em: 2007-08
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9. Sobre a técnica Fast Collocation (colocação rápida) na determinação do geóide do estado de São Paulo utilizando dados das missões Champ e Grace
Os objetivos deste trabalho são: determinar o geóide do Estado de São Paulo (SP) pela técnica matemática Fast Collocation utilizando o modelo do geopotencial CG01c, derivado das novas missões gravimétricas de satélite CHAMP e GRACE, avaliar esse geóide através de estações com alturas geoidais conhecidas e do geóide calculado por Souza (2002), e
Publicado em: 2007
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10. Padrões sinóticos de circulação atmosférica associados ao jato em baixos níveis a leste da Cordilheira ds Andes, na América do Sul / Atmospheric circulation patterns associated with the south america low level jet at east of the Andes
The objective of this studywas toidentify the atmospheric patterns circulationassociated with the South American Low-level Jet (LLJ). The zonal (u) and meridional (v) wind, geopotential height (f), temperature (T), specific humidity (q) and other variables from National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/06/2006
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11. Climatologia e comportamento dos sistemas frontais sobre a América do Sul / Climatology and behaviour of frontal systems in south america
A climatology from 1980 to 2002 of frontal systems that reach Brazil and the main atmospheric patterns related to their displacement over the continent are analysed in this study. A reduction of frontal systems was observed in low latitudes and in summer. During the winter, more cold fronts can reach interior areas of Brazil. There is not a significant seaso
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/04/2005
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12. 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