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The reliability of GPS Positioning

\the credibility of a larger solution does have a high positioning accuracy due to the use type <3) Find the solution must be obtained fuzzy locate all possible four-star positioning solutions and credibility, so using (3) Positioning Solutions of Fuzzy matrix multiplication will be heavily involved with the inversion. taking into account the definition of this volume of air of credibility of the first 2o slow change its value directly by equation (3) Calculate the fuzzy positioning solution will not achieve prominence with large credibility of the role of positioning solutions, and also to reduce the amount of calculation should be equation (3) to improve it. Specifically, this includes: ① Set the lower limit of SNR S, the top angle of the lower seat height and star standard reliability the lower limit (such as preferred A = 50., S = 35, the SNR can not achieve the \S base is larger than all the stars. Calculated for each group of stars and top seat base consisting of four-star star positioning constellation of PDOP value, then the credibility given by the previous calculation of the analytical expression of confidence; ③ Remove the top of Star Tower, the remaining satellites to determine The maximum elevation angle is greater than A, if so, to have the elevation angle of satellite as Block top stars go to step (2), if not, stop; ④ credibility with the previous maximum value will be calculated Find the credibility of the standard, then calculate the positioning solution more than credibility standardization; ⑤ ④ step in setting the positioning solution is obtained (a 1,2, ..., M) credibility as \2, ...,), according to a Σ (4) M calculated fuzzy Positioning r. which = has. in accordance with the above method to find fuzzy positioning solution will have less credibility and positioning solution values ignored, this can reduce the computation, but also help improve the positioning accuracy of the solution fuzzy parameters in the above method s, and the need to take much more appropriate to be determined by experiment 4 Conclusion GPS Positioning in front of the credibility of a systematic study, and gives positioning solutions for finding the fuzzy approach. Because this method only requires software to be improved, there is no additional hardware requirements, and thus most of the c / A code receiver, it can be done. In addition this has been given the credibility of the analytical expression, so as to improve the software provides a very convenient conditions. will be transplanted to the above method c / A code receiver and verify the feasibility of the work is in planning. If this approach to be verified and applied in the actual navigation and positioning, will greatly enhance the common C / A code receiver positioning accuracy, which for only a C / A code Receiver and civilian users is of great value.