Accuracy evaluation on satellite orbit determination of BDS-3 PPP-B2b service
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摘要: 随着北斗三号全球卫星导航系统(BDS-3)的成功组网，新启用的B2b信号由于承载着精密单点定位(PPP)服务而备受关注，但该信号的应用尚未普及，为探究PPP-B2b信号的服务性能，针对自研板卡接收的B1C和PPP-B2b导航电文数据，以德国地学研究中心(GFZ)提供的精密星历产品及其插值结果为参考基准，计算卫星定轨结果与参考基准的互差序列和均方根误差(RMSE)，评估广播星历和PPP-B2b精密改正轨道的轨道精度. 结果表明：广播轨道在径向(R)、切向(T)、法向(N)的精度均值分别为0.19 m、0.65 m和0.89 m；精密改正轨道在R、T、N的精度均值分别为0.13 m、0.32 m和0.29 m；自研板卡接收的PPP-B2b信号满足PPP的应用要求，为下一步开发基于PPP-B2b信号的相关产品提供数据参考.
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关键词:
- 北斗三号全球卫星导航系统(BDS-3) /
- 18参数模型 /
- PPP-B2b /
- Neville插值 /
- 轨道精度评估
Abstract: With the successful networking of the BeiDou-3 Navigation Satellite System, the B2b, a new signal, can provide precise point positioning (PPP) service, which has attracted more and more attention. However, its application was not yet widespread. To explore the performance of the PPP-B2b service signal, we calculated the results of satellite orbit determination based on the B1C and PPP-B2b navigation message data received by our original-designed board. The simulation results compared with that based on the precision ephemeris products and their interpolation results provided by the German Geoscience Research Center. Two error indices (the cross-difference sequence and the root mean square error) were calculated to evaluate the orbit accuracy after broadcast ephemeris and PPP-B2b precise orbit correction. The results show that the broadcast orbit accuracy is generally 0.19 m, 0.65 m and 0.89 m in the radial (R), tangential (T) and normal (N) directions. The average accuracy of precise orbit correction is generally 0.13 m, 0.32 m and 0.29 m in the R、 T 、N directions, respectively. The PPP-B2b service signal received by our original-designed board can satisfy the application requirements of precise point positioning. This would provide data reference for the next development of related products based on PPP-B2b signal. -
表 1 卫星星历参考框架转换参数
参数 估值 标准差 T_x/mm −0.370 0.740 T_y/mm 1.120 0.740 T_z/mm −0.550 0.740 R_x/mas 0.010 0.030 R_y/mas −0.020 0.030 R_z/mas 0.050 0.040 Scal/ppb 0.011 0.012 
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