Influência da geometria dos satélites na precisão das coordenadas geodésicas obtidas com o sistema GPS / Influence of satellite geometry on the geodetic coordinates precision from GPS determinations

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The obtaining precision of GPS (Global Positioning System) surveying depends on of many factors, due the several error fonts. In general, these interferences can be modeled and considerations are made as each one contributes. In the beginning of the positioning systems, the mission planning was essential to find the period of the day that would possible to have satellites enough to position determination. Since the GPS was declared operational this issue lost importance. Hence there is a lack of conclusive researches about the influence of the satellites positioning regarding the receptor antenna position may cause on the results. This issue was investigated using tools like the available precision indicators (DOP - Dilution of Precision). Considerations regarding interpretation of the geometric figure (thetraedron), that its volume is considered proportional to the DOP were analyzed. The reliability and the geometry contribution in the results were verified. Comparisons between planning and surveying values were done to the absolute and relative positioning. The influence of the baseline in indicator values determination was analyzed as the influence in the accuracy by DOP spikes. The issue regarding the expectative that the periods with good DOP values may contribute to the ambiguity fix status was also clarified.

ASSUNTO(S)

dilution of precision global positioning system relative positioning sistema de posicionamento global diluição da precisão posicionamento relativo satellite geometry geometria orbital

ACESSO AO ARTIGO

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