GPS多站组网的亚纳秒实时时间比对算法

针对传统GPS PPP(precise point positioning)时间比对算法依赖精密星历产品、时间延迟较长和实时性差等问题,提出了一种多站组网实时时间比对算法。采用IGU超快速星历产品作为解算输入条件,利用多站联测增加多余观测,将测站钟差和卫星钟差作为未知数统一解算。实验结果表明,比对结果与IGS最终钟差的一致性达到了0.3 ns以内,比对结果的天频率稳定度优于2.5×10^-15。

GPS Multi-stations Networking for Real-Time Subnanosecond Level Time Comparison

Precise point positioning, as a method for high precision time comparison, has the defects of long latency, poor real-time performance and heavy reliance on precise ephemeris and clock products. A new GPS multi-stations networking for real-time time comparison algorithm is proposed. Redundant observations are obviously increased by multi-stations simultaneous surveying. The clock errors of receivers and satellites are simultaneously estimated with the inputs of IGS ultra-rapid ephemeris. Experiments show that, the time difference between proposed algorithm in this paper and IGS final clock products is less than 0.3 ns, and the daily frequency stability of the alignment results is better than 2.5×10-15.