Abstract:

GPS positioning error is decided by 2 factors:PDOP and SNR 3(the sum of signal to noise ratio of three baseframe satellites). To give the positioning solution a more reasonable assessment, it is necessary to consider these 2 factors simultaneously. This paper presents firstly the fuzzy membership function of PDOP and SNR 3, and then uses the fuzzy comprehensive judgement to generate the definition of reliability degree of GPS positioning solution. Based on the definition, an analytical expression of reliability degree of GPS positioning solution is obtained. By utilizing the analytical expression, the properties of reliability degree of GPS positioning solution are studied. The calculated results show that the reliability degree of GPS positioning solution can accurately reflect the actual situation of positioning solution. Finaly, this paper also seeks to investigate the possible application of reliability degree of GPS positioning solution.

Key words: GPS, fuzzy mat hematics, r eliability degree