GPS与GLONASS间系统时间偏差监测评估

Monitoring and Evaluating GPS -GLONASS Time Offset

本文针对融合PPP参数估计和精密PPS信号，对测量两种GNSS系统间时间偏差算法的原理进行了分析和比较，并采用实测数据分别对两种算法进行了实现。通过分析结果发现，基于融合PPP参数估计的算法所估计的系统时间偏差参数含有接收机硬件延迟，其结果与接收机硬件相关，并且具有滞后性；而基于精密PPS信号测量可以真实地反映系统间时间偏差，并且具有实时性，其缺点是仍受硬件特性的制约。

The principles of fusion PPP parameter estimation and precise PPS signal measurement for GNSS system time off- set are analyzed and compared, and experimental data are used to realize the two algorithms respectively. The analysis results show that the time offset parameter obtained by using fusion PPP parameter estimation method contains the receiver hardware de- lay, which is associated with the receiver hardware and has a time lag. On the other hand, the precise PPS signal measurement method can truly reflect the time offset between systems in real time, but it is still constrained by the hardware performance.