A satellite clock error correction method in the wide area differential system |
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Authors: | ChengLin Cai XiaoHui Li HaiTao Wu XingWang Chang |
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Institution: | 1 National Time Service Center, Chinese Academy of Sciences, Lintong 710600, China;
2 Hunan Institute of Humanities, Science and Technology, Loudi 417000, China;
3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | Based on the deep analysis of the wide area differential principle on the separation of satellite ephemeris errors and clock
errors, the similarities and differences between the absolute separation of satellite ephemeris errors under time synchronization
among the differential stations and relative separation of them under no time synchronization among them are analyzed. A one-station
correction method of satellite clock errors including the 1st and the 2nd step correction is given under no time synchronization
among these secondary stations, and the backward inference algorithm of the second correction of satellite clock errors is
proposed. Through simulation analysis, satellite time service accuracy with code phase measurement can reach 5–7 ns, and that
with carrier phase smoothing pseudo-range can reach 1–3 ns. |
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Keywords: | wide area differential system (WAD) differential station satellite time service accuracy satellite clock error |
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