实时PPP时间传递性能评估

Performance evaluation of real-time PPP time transfer

高精度的实时产品为基于实时精密单点定位(RTPPP)技术授时终端的研制提供了有利条件。为分析授时终端基于实时产品进行时间传递所能达到的效果,本文首先对现有授时终端的GPS观测数据进行质量分析,然后结合实时产品进行PPP解算。试验结果表明,从卫星可见数、PDOP值、多路径误差3个方面分析,授时终端的观测数据与NT02、BRUX测站的观测数据质量相当,因此测站接收到的数据稳定可用,可为下一步的性能分析提供有效数据;将授时终端的实时PPP时间传递结果与事后PPP时间传递结果作差,可得零基线共钟比对结果的均方差(RMS)优于0.05 ns,长基线比对结果的RMS优于0.2 ns;将零基线试验中的两台授时终端的时间传递结果与接收机类型为JAVAD TRE_3的两台设备的时间传递结果作差,比对精度优于0.07 ns,将长基线试验中的两台授时终端的时间传递结果与接收机类型为SEPT POLARX5TR的两台设备的时间传递结果作差,比对精度优于0.2 ns。

High-precision real-time products provide favorable conditions for the development of the timing terminal based on the real-time precise point positioning(RTPPP)technology.In order to analyze the effect that the timing terminal can achieve based on the time transmission of the real-time product,the quality analysis of the GPS observation data of the existing timing terminal is first analyzed,and then the PPP solution is carried out in combination with the real-time product.The test results show that from the analysis of satellite visible number,PDOP and Multipath,compared with the observation data of the NT02 and BRUX stations,the observation data of the timing terminal is of the same quality,so the data received by the station is stable and available,which can provide effective data for the next step of performance analysis.Subtract the real-time PPP time transfer result of the timing terminal from the post PPP time transfer result,RMS of the zero baseline common clock comparison result can be obtained to be better than 0.05 ns,and the RMS of the long baseline comparison result is better than 0.2 ns.The time transfer results of the two timing terminals in the zero baseline test are subtracted from the time transfer results of two devices with a receiver type of JAVAD TRE_3,and the RMS is better than 0.07 ns,and the time transfer results of the two timing terminals in the long baseline test are subtracted from the time transfer results of two devices with receiver type SEPPT POLARX5TR,and the RMS is better than 0.2 ns.