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Term design and analysis of user range accuracy in GPS navigation message


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Term design and analysis of user range accuracy in GPS navigation message
Wang Luxiao12Huang Zhigang1Zhao Yun1
1.School of Electronic and Information Engineering,Beihang University,Beijing 100191,China; 2.College of Communication and Information Engineering,Chongqing University of Posts and Communications,Congqing 400065,China
sdtellite navigation system integrity user range accuracy protect level
To study the impact of the integrity terms design on the user integrity performance for the satellite navigation system,the integrity parameter fractional resolutions and user algorithm of the user range accuracy(URA)parameters of the GPS message are studied here.By means of the broadcast and the precise ephemeris collected from the international GPS service(IGS),the change necessity of the URA index and the cabinet mode is proved.The independent ephemeris and clock URA index are proved to be able to describe the satellite error characteristic better.The satellite constellation is obtained from the broadcast ephemeris.The user range error at the worst user location in the service volume is simulated taking into account the propagation errors,and its index is calculated by the weighted method and the maximal variance method,and its indices are compared and contrast with different URA update intervals with and without improvements respectively.The research results demonstrate the further fractionized 5 bits URA index with 32 binning structures can discriminate the satellite errors and improve user integrity performance.


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Last Update: 2014-10-31