Funções Matemáticas Aplicadas a Determinação dos Pesos no Posicionamento DGPS
DOI:
https://doi.org/10.5540/tema.2008.09.01.0073Abstract
Dentre as métodos de posicionamento GPS (Global Positioning System) o DGPS (Differential GPS) tem grande destaque. Para que o usuário possa realizar o posicionamento aplicando correções DGPS é utilizado o MMQ (Método dos Mínimos Quadrados). Assim, algo muito importante a ser considerado neste método é o peso dado a cada observação. Logo, partindo do princípio de que os satélites que têm maior ângulo de elevação atravessam uma camada menor da atmosfera, pode-se assumir que as observações desses satélites têm melhor qualidade e, portanto, devem ter um peso maior no ajustamento. Nesse artigo, diferentes funções matemáticas foram utilizadas para determinar os pesos das observações em função do ângulo de elevação. As melhorias obtidas chegaram a até 27%.References
[1] C. Gemael, “Introdução ao Ajustamento de Observações: Aplicações Geodésicas”, UFPR, Curitiba, 1994.
M.L. Gizawy, “Development of an Ionosphere Monitoring Technique Using GPS Measurements for High Latitude GPS Users”, Dissertação de Mestrado, University of Calgary, Calgary, 2003.
B. Hofmann-Wellenhof, H. Lichtenegger, J. Collins, “GPS Theory and Practice” 4ed. Spring-Verlag, Wien,1997.
A. Leick, “GPS - Satellite Surveying”, 2ed. John Wiley & Sons, 1995.
J.F.G. Monico, “Posicionamento pelo NAVSTAR-GPS: Descri¸c˜ao, Fundamentos e Aplica¸c˜oes”, 1ed. UNESP, S˜ao Paulo, 2000.
M. Olynic, “Temporal Characteristics of GPS Error Sources and Their Impact on Relative Positioning”, Disserta¸c˜ao de Mestrado, University of Calgary, Calgary, 2002.
G. Seeber, “Satellite Geodesy: Foundations, Methods, and Applications”, Walter de Gruyter, Berlin, New York, 2003.
G. Weber, H. Gebhard, R. Kalafus, Networked Transport of RTCM via Internet Protocol (Ntrip) - IP-Streaming for Real-Time GNSS Applications, em “ION GNSS 2005”, Long Beach, California, 2005.
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