Initial Assessment of the BDS-3 PPP-B2b RTS compared with the CNES RTS
Initial Assessment of the BDS-3 PPP-B2b RTS compared with the CNES RTS
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DOI：
10.1007/s10291-021-01168-1
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发表时间：
2021-10-01
期刊：
影响因子：
4.9
通讯作者：
Ju, Boxiao
中科院分区：
文献类型：
--
作者：
Tao, Jun;Liu, Jingnan;Ju, Boxiao
2020年，北斗导航卫星系统（BDS）为中国及周边地区的用户推出了使用B2b信号的精确单点定位（PPP）实时服务（RTS）。预计使用单个接收机将达到分米级的精度。在这项研究中，PPP-B2b服务进行了实验分析的基础上7天的校正和比较由法国国家空间研究中心（CNES）提供的RTS。这两个RTS产品的可用性和完整性的基础上的观测特定的偏差（OSB），卫星轨道和时钟偏移产品的质量进行评估。还计算和评估了信号空间测距误差（SISRE）。PPP-B2b可以在亚洲提供稳定的服务，BDS-3的可用性和完整性优于法国国家空间研究中心，但GPS的情况正好相反。分析表明，GPS的PPP-B2b时钟偏移存在不可忽略的恒定卫星特定偏差，BDS-3的偏差较小;法国国家空间研究中心的产品中不存在这种偏差。PPP-B2b产品的SISRE受到这种偏差的影响，但SISRE STD与CNES产品的相当。利用分布在中国各地的6个台站对PPP-B2b和CNES产品进行了定位实验。仅BDS-3定位的运动学PPP结果使用PPP-B2b达到厘米级精度，与使用法国国家空间研究中心的仅GPS结果非常一致。GPS的异常平均收敛时间超过60分钟，证实了PPP-B2b时钟偏移中的卫星特定偏差降低了伪距精度，这在不久的将来应该得到改善。
In 2020, the BeiDou navigation satellite system (BDS) initiated a real-time service (RTS) for precise point positioning (PPP) using the B2b signal for users in China and its surrounding areas. A decimeter-level accuracy is expected to be achieved using a single receiver. In this study, the PPP-B2b service is experimentally analyzed based on 7 days of corrections and compared with the RTS provided by the Centre National d'Etudes Spatiales (CNES). The availability and completeness of these two RTS products are first evaluated based on the quality of the observation-specific bias (OSB), the satellite orbit and clock offset products. The signal-in-space ranging error (SISRE) is also calculated and evaluated. PPP-B2b can provide stable service in Asia and has better availability and completeness for BDS-3 than does CNES, though the opposite is true for GPS. The analysis reveals a nonnegligible constant satellite-specific bias in the PPP-B2b clock offset for GPS and a smaller bias for BDS-3; this bias is absent in the CNES products. The SISREs of the PPP-B2b products are affected by this bias, but the SISRE STD is comparable to that of the CNES products. Positioning experiments are carried out for the PPP-B2b and CNES products using six stations evenly distributed across China. The kinematic PPP results of BDS-3-only positioning, achieving accuracy at the centimeter level using PPP-B2b, are in good agreement with the GPS-only results using CNES. The abnormal average convergence time exceeding 60 min for GPS confirms that the satellite-specific bias in the PPP-B2b clock offset degrades the pseudorange accuracy, which should be improved in the near future.