WANG Binghao, ZHOU Jianhua, CHEN Junping, ZHANG Yize, WANG Ahao. A Fitting Algorithm and Positioning Analysis of BDS WADS Zone Correction[J]. Geomatics and Information Science of Wuhan University, 2020, 45(4): 565-573. DOI: 10.13203/j.whugis20180260
Citation: WANG Binghao, ZHOU Jianhua, CHEN Junping, ZHANG Yize, WANG Ahao. A Fitting Algorithm and Positioning Analysis of BDS WADS Zone Correction[J]. Geomatics and Information Science of Wuhan University, 2020, 45(4): 565-573. DOI: 10.13203/j.whugis20180260

A Fitting Algorithm and Positioning Analysis of BDS WADS Zone Correction

Funds: 

The National Natural Science Foundation of China 11673050

the National Key Research and Development Program of China 2018YFB0504300

More Information
  • Author Bio:

    WANG Binghao, PhD candidate, specializes in the GNSS wide area differential model and algorithm.E-mail:wangbinghao7@126.com

  • Corresponding author:

    CHEN Junping, PhD, professor.E-mail:junping@shao.ac.cn

  • Received Date: February 19, 2019
  • Published Date: April 04, 2020
  • The BeiDou Navigation Satellite System (BDS) provides wide area differential service (WADS) for users in China territory by broadcasting equivalent satellite clock, orbit correction, ionospheric grid information and zone correction through Geostationary Earth Orbit (GEO) satellites. By using WADS corrections correctly, users with code observations can get meter-level positioning accuracy while carrier phase users can get decimeter-level result. However, the imperfection and discontinuity of zone correction bring a negative influence upon positioning. Aiming at solving the precision deterioration and positioning re-convergence caused by the discontinuity of zone correction, a fitting algorithm is proposed for zone correction generation and user's positioning. The fitting algorithm is established on the basis of the stability of double-differenced zone corrections. By fixing the zone correction of one reference satellite and the double-differenced bias between multiple zones and satellites, the correction gap can be filled up successfully. Then, the validity of the algorithm and the performance of fitting zone correction was evaluated by differential positioning experiments using observations from six Multi-GNSS Experiment (MGEX) stations within zone correction service range under kinematic PPP mode. Experiment results show that although the positioning precision of fitting zone corrections, which is 0.20 m and 0.44 m for horizontal and vertical components respectively, is slightly inferior to the result derived by using the original corrections. In the discontinuous periods of zone correction, the positioning results are much more stable and continuous, and without positioning re-convergence. With no additional information used in correction fitting, the algorithm can be used for the zone correction generation period and position, which will improve the service integrity and positioning reliability.
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