An enhanced algorithm to estimate BDS satellite's differential code biases
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- 作者：Chuang Shi ; Lei Fan ; Min Li ; Zhizhao Liu ; Shengfeng Gu ; Shiming Zhong…
- 关键词：Beidou Navigation Satellite System ; Differential code bias ; Uncombined precise point positioning ; Ionospheric delay ; Geometry ; free linear combination of phase ; smoothed range
- 刊名：Journal of Geodesy
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：90
- 期：2
- 页码：161-177
- 全文大小：1,965 KB
- 参考文献：Abdel-salam MA-T (2005) Precise point positioning using un-differenced code and carrier phase observations. PhD Thesis, University of Calgary, Calgary
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Lei Fan (1)
Min Li (1)
Zhizhao Liu (2)
Shengfeng Gu (1)
Shiming Zhong (3)
Weiwei Song (1)
1. GNSS Research Center, Wuhan University, 129 Luoyu Road, Wuhan, 430079, China
2. Department of Surveying and Geo-informatics, Hong Kong Polytechnic University, 11 Yuk Choi Road, Hung Hom, Kowloon, Hong Kong, China
3. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, 340 Xudong Street, Wuhan, 430077, China - 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Geophysics and Geodesy
Mathematical Applications in Geosciences - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-1394
文摘
This paper proposes an enhanced algorithm to estimate the differential code biases (DCB) on three frequencies of the BeiDou Navigation Satellite System (BDS) satellites. By forming ionospheric observables derived from uncombined precise point positioning and geometry-free linear combination of phase-smoothed range, satellite DCBs are determined together with ionospheric delay that is modeled at each individual station. Specifically, the DCB and ionospheric delay are estimated in a weighted least-squares estimator by considering the precision of ionospheric observables, and a misclosure constraint for different types of satellite DCBs is introduced. This algorithm was tested by GNSS data collected in November and December 2013 from 29 stations of Multi-GNSS Experiment (MGEX) and BeiDou Experimental Tracking Stations. Results show that the proposed algorithm is able to precisely estimate BDS satellite DCBs, where the mean value of day-to-day scattering is about 0.19 ns and the RMS of the difference with respect to MGEX DCB products is about 0.24 ns. In order to make comparison, an existing algorithm based on IGG: Institute of Geodesy and Geophysics, China (IGGDCB), is also used to process the same dataset. Results show that, the DCB difference between results from the enhanced algorithm and the DCB products from Center for Orbit Determination in Europe (CODE) and MGEX is reduced in average by 46 % for GPS satellites and 14 % for BDS satellites, when compared with DCB difference between the results of IGGDCB algorithm and the DCB products from CODE and MGEX. In addition, we find the day-to-day scattering of BDS IGSO satellites is obviously lower than that of GEO and MEO satellites, and a significant bias exists in daily DCB values of GEO satellites comparing with MGEX DCB product. This proposed algorithm also provides a new approach to estimate the satellite DCBs of multiple GNSS systems.