差分码偏差对PPP授时精度影响的研究

Study on the Influence of Differential Code Bias on PPP Timing Precision

关键词:  GPS  精密单点定位(PPP)  差分码偏差(DCB)  授时  钟差

Key words:  GPS  Precise Point Positioning (PPP)  Differential Code Bias(DCB)  Timing  Clock

摘要:

论文分析了不同机构差分码偏差(DCB)产品的天稳性。选取了2个外接氢原子钟的测站进行实验，以国际GNSS服务组织(IGS)发布的接收机钟差为参考值，分析了不同机构DCB产品对2个测站PPP授时精度的影响。实验结果表明：1)不同机构DCB产品的天稳性差异不大，中国科学院天稳性略优于德国宇航中心；2)2个测站使用不同机构的DCB产品估计钟差的均方差(RMS)和时间偏差（Bias）均优于0.4ns，其中中国科学院产品精度最高，RMS和Bias均优于0.2ns；德国宇航中心和欧洲定轨中心精度略差，但也能够达到亚纳秒级，可为下一步推广PPP授时应用提供一定的参考。

Abstract:

The day stability of Differential Code Bias(DCB) products with different institutions is studied. In order to accurately evaluate the influence of DCB on PPP timing accuracy, two stations with external hydrogen clocks are selected. Taking the receiver clock difference published by International GNSS Service (IGS) as reference value, the influence of DCB products of different institutions on PPP timing accuracy of the two stations is analyzed. The results show that, 1) there is little difference in the day stability of DCB products from different institutions, and the day stability of Chinese Academy of Sciences is slightly better than that of German Aerospace Center; 2) The RMS and bias of the estimated clock error using DCB products from different institutions at the two stations are better than 0.4ns. Products of Chinese Academy of Sciences have the highest accuracy, with RMS and bias better than 0.2ns, and product accuracy of German Aerospace Center and Center for Orbit Determination in Europe is slightly worse, but can also reach the sub-nanosecond level, which can provide some reference for the further promotion of PPP timing applications.