Time delay bias between the second and third generation of BeiDou Navigation Satellite System and its effect on precise point positioning
Time delay bias between the second and third generation of BeiDou Navigation Satellite System and its effect on precise point positioning
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第二代与第三代北斗卫星导航系统时滞偏差及其对精密单点定位的影响
DOI：
10.1016/j.measurement.2020.108346
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发表时间：
2021-01-15
期刊：
影响因子：
5.6
通讯作者：
Li, Jiancheng
中科院分区：
文献类型：
--
作者：
Cao, Xinyun;Shen, Fei;Li, Jiancheng
为实现北斗二号区域导航卫星系统（BDS-2）与北斗三号全球导航卫星系统（BDS-3）的深度融合，针对北斗二号/北斗三号联合精密单点定位（PPP），分析了北斗二号和北斗三号在接收端的时延偏差。选取20个不同接收机类型的多GNSS（Global Navigation Satellite System）实验跟踪站，研究了时延偏差的时变特性。本文还综合分析了时延偏差对无电离层PPP和未合并PPP的影响。结果表明，连续几天的时延偏差日均值变化在1 ns以内，没有明显的日边界不连续性。此外，相同品牌的接收器的时间延迟偏差可以相差几纳秒，特别是对于特林布尔接收器。在不考虑BDS-2和BDS-3之间的时延偏差的情况下，伪距残差、电离层倾斜时延、浮点模糊度等参数随时延偏差的大小而变化，而相位残差和定位精度受影响较小。此外，忽略时延偏差对无电离层PPP浮点模糊度的影响要大于未合并PPP浮点模糊度的影响。
To realize the deep integration of BeiDou-2 regional navigation satellite system (BDS-2) and BeiDou-3 global navigation satellite system (BDS-3), the time delay bias between BDS-2 and BDS-3 at the receiver side is analyzed for the joint BDS-2/BDS-3 precise point positioning (PPP). Twenty Multi-GNSS (Global Navigation Satellite System) Experiment tracking stations with different receiver types were selected to investigate the time-varying characteristics of time delay bias. We also make a comprehensive analysis about the influence of time delay bias on the ionosphere-free PPP and uncombined PPP. The results show that the daily mean values of time delay bias for consecutive days vary within 1 ns without apparent day-boundary discontinuities. In addition, the time delay bias for the receivers of the same brand can differ by several nanoseconds, especially for the TRIMBLE receivers. Without considering the time delay bias between BDS-2 and BDS-3, the pseudorange residuals, slant ionospheric delays, float ambiguities are subjected to change with the magnitude of the time delay bias, while the phase residuals and positioning accuracy are slightly affected. Moreover, the deviation of float ambiguity in ionosphere-free PPP caused by neglecting the time delay bias is larger than that of uncombined PPP.