Citation: | TIAN Qiuning, CAO Yueling, HU Xiaogong, et al. Accuracy evaluation of wide-area differential service for BDS-3[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(5): 967-976. doi: 10.13700/j.bh.1001-5965.2020.0108(in Chinese) |
In order to ensure the smooth transition of the wide-area differential service of the Beidou system, the Beidou-3 System (BDS-3) uses D2 navigation message on GEO satellite to broadcast the equivalent clock correction and ionospheric grid information on B1I/B3I frequency. This paper analyzes the characteristics of the equivalent clock correction and ionospheric grid information after adding the BDS-3 satellite, and compares the User Differential Range Error (UDRE) of satellite between the BDS-2 and the BDS-3. Combined with the measured data of BDS-2 and BDS-3, this paper also evaluates the positioning accuracy of wide-area differential service of BDS-3. The analysis results show that, after using the equivalent clock correction, the User Equivalent Range Error (UERE) of the BDS-2 satellite changes from approximately 1 meter to approximately 0.3 meters, while the BDS-3 satellite UERE changes from approximately 0.4 meters to approximately 0.2 meters. The results show that the equivalent clock correction can correct the space signal step error brought by the update of the broadcast message, and significantly improve the satellite space signal accuracy. Compared with the Klobuchar 8 model broadcast by the basic navigation system, the ionospheric grid information broadcast by the wide-area differential system can improve the accuracy of ionospheric error correction by about 18%. In comparison with BDS-2 single system, the accuracy of single-frequency positioning for BDS-2/BDS-3 can be improved by 26%, while that of dual-frequency positioning can be improved by 41%. The positioning accuracy of single-frequency users for wide-area differential services is 2.4 meters, and the positioning accuracy of dual-frequency users is 1.7 meters, which is improved by 13% and 41% respectively.
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