BDS PPP高精度时间传递方法与精度比较

Research on Time Transfer:Based on BDS Precise Point Positioning and Accuracy Comparison

利用武汉大学发布的事后精密星历和5min间隔的精密卫星钟差产品,运用北斗精密单点定位技术(BDS PPP)进行时间传递实验,实验数据采用甘肃省卫星定位连续运行基准站中4个站3d的观测结果。为了验证BDS载波相位法(BDS CP)时间传递的精度,将其与GPS CP法进行对比。结果表明,BDS CP法与GPS CP法之差的RM_S大约在±0.055ns左右,而GPS CP法可以实现0.1~0.2ns的时间传递,因此在亚ns量级上可以认为这两种方法的精度基本相当。

A time transfer experiment based on the BDS precise point positioning （BDS PPP） technique is carried out using WHU （Wuhan University） 5 min precise satellite clock products. Experimental data come from the observations of four stations that belong to Gansu continuously operation reference station system. In order to verify the accuracy of time transfer based on BDS carrier phase （BDS CP）, this paper compares the difference between BDS CP results and GPS CP results. The experimental re- sults demonstrate that the RMS of the difference between BDS CP and GPS CP is about ±0. 055 ns. Since the accuracy of time transfer based on GPS CP is up to 0.1-0.2 ns, it can be inferred that the accura- cy of time transfer based on BDS CP is roughly equal to GPS CP.