Acta Geodaetica et Cartographica Sinica >

2016 , Vol. 45 >Issue S2: 64 - 71

DOI: https://doi.org/10.11947/j.AGCS.2016.F027

Analysis and Application of BDS Broadcast Ephemeris Bias

  • ZHANG Yize ,
  • CHEN Junping ,
  • ZHOU Jianhua ,
  • YANG Sainan ,
  • WANG Bin ,
  • CHEN Qian ,
  • GONG Xiuqiang
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  • 1. College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China;
    2. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200092, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Beijing Satellite Navigation Center, Beijing 100094, China

Received date: 2016-11-25

  Revised date: 2016-12-20

  Online published: 2017-05-20

Supported by

The National High-tech Research and Development Program of China (863 Program) (No. 2014AA123102);The National Natural Science Foundation of China (Nos.11673050;11273046)

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Abstract

We analyze the BeiDou broadcast ephemeris biases starting from February 2014 to October 2016 by using the IGS post-processed precise orbit and clock as references. Results show that the bias of BeiDou broadcast ephemeris can reach up to 2 meter. To further verify this finding, we perform precise point positioning for about 18 MGEX stations using BeiDou broadcast ephemeris and wide-area differential correction parameters. Data of 97 days are analyzed and pseudo-range residuals of each frequency for each station are derived. Systematic biases are found in the residuals using broadcast ephemeris. Comparing the BEB applying the differential correction parameters with the TGD difference between IGS and BeiDou broadcast ephemeris, we find that the correlation coefficient of TGD differences and BEB values could reach up to 0.89. This proves that the BEB applying the differential correction parameters is mainly due to the biases of the TGD parameters in broadcast ephemeris. By correcting the biases into TGD parameters, we performed point positioning at different stations. Results show that after applying the biases, the pseudo-range error reduces much, and the positioning precision can improve about 14.9%, 28.4%, 15.5% in N,E,U, direction for dual-frequency users, respectively.

Key words： MGEX; pseudo-range residual; broadcast ephemeris bias; TGD; point positioning

Cite this article

ZHANG Yize , CHEN Junping , ZHOU Jianhua , YANG Sainan , WANG Bin , CHEN Qian , GONG Xiuqiang . Analysis and Application of BDS Broadcast Ephemeris Bias[J]. Acta Geodaetica et Cartographica Sinica, 2016 , 45(S2) : 64 -71 . DOI: 10.11947/j.AGCS.2016.F027

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