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| 引用本文： | 戴小蕾,楼益栋,李文.GPS???????????????????????????[J].大地测量与地球动力学,2013,33(1):53-58. |
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| 作者姓名： | 戴小蕾 楼益栋 李文 |
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| 作者单位： | 武汉大学卫星导航定位技术研究中心,武汉,430079 |
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| 基金项目： | 国家自然科学基金(40904007);国家863项目(2012AA12A202) |
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| 摘 要： | ??????GPS?????е??????????????????????????????????????????????????????????????й?????????????????????????????????????￡?18??????????????16?????????????????????2С??????????????18??????????16??????????????GPS ?????????2????????16????4С????????????????14cm,????18????3С????????????????1cm??
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| 关 键 词： | GPS?????? GPS????? ??????? ??????? ??????? |
ACCURACY ANALYSIS OF TWO GPS BROADCAST EPHEMERIS FITTING AND EXTRAPOLATION ALGORITHM |
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| Dai Xiaolei,Lou Yidong and Li Wen.ACCURACY ANALYSIS OF TWO GPS BROADCAST EPHEMERIS FITTING AND EXTRAPOLATION ALGORITHM[J].Journal of Geodesy and Geodynamics,2013,33(1):53-58. |
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| Authors: | Dai Xiaolei Lou Yidong and Li Wen |
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| Institution: | (Research Center of GNSS,Wuhan University,Wuhan 430079) |
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| 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 18 parameter algorithm is an order of magnitude higher than the 16 parameter algorithm for the orbit fitting accuracy in the same fitting interval, and the 18 parameter algorithm is better than the 16 parameter algorithm for the 2 hour orbit extrapolation. According to the current GPS broadcast ephemeris update strategy, the 4 hour orbit fitting by the 16 parameter algorithm could have the accuracy by 14cm, while the 3 hour orbit fitting by the 18 parameter algorithm could have the accuracy by 1cm. |
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| Keywords: | GPS broadcast ephemeris GPS modernization parameter fitting orbit extrapolation precision analysis |
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