ACCURACY ANALYSIS OF TWO GPS BROADCAST EPHEMERIS FITTING AND EXTRAPOLATION ALGORITHM
Dai Xiaolei;Lou Yidong ;and Li Wen
Research Center of GNSS,Wuhan University,Wuhan 430079
Abstract A parameter fitting algorithm was studied for the current broadcast ephemeris and the modernizing broadcast ephemeris which were used to analyze the orbit fitting accuracy and orbit extrapolating accuracy respectively. It was shown that the 18parameter algorithm is an order of magnitude higher than the 16parameter algorithm for the orbit fitting accuracy in the same fitting interval, and the 18parameter algorithm is better than the 16parameter algorithm for the 2hour orbit extrapolation. According to the current GPS broadcast ephemeris update strategy, the 4hour orbit fitting by the 16parameter algorithm could have the accuracy by 14cm, while the 3hour orbit fitting by the 18parameter algorithm could have the accuracy by 1cm.
Key words ：
GPS broadcast ephemeris
GPS modernization
parameter fitting
orbit extrapolation
precision analysis
Received: 01 January 1900
Corresponding Authors:
Dai Xiaolei
Cite this article:
Dai Xiaolei,Lou Yidong,and Li Wen. ACCURACY ANALYSIS OF TWO GPS BROADCAST EPHEMERIS FITTING AND EXTRAPOLATION ALGORITHM[J]. , 2013, 33(1): 53-58.
Dai Xiaolei,Lou Yidong,and Li Wen. ACCURACY ANALYSIS OF TWO GPS BROADCAST EPHEMERIS FITTING AND EXTRAPOLATION ALGORITHM[J]. jgg, 2013, 33(1): 53-58.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2013/V33/I1/53
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