利用GPS精密单点定位进行时间传递精度分析

Accuracy Analysis of Time and Frequency Transfer Based on Precise Point Positioning

利用静态精密单点定位技术(PPP),分别采用IGS5min和30s间隔的精密卫星钟差产品进行单站时间传递实验。实验结果表明,无论是利用5min间隔的卫星钟差产品,还是利用30s间隔的卫星钟差产品,静态PPP都可以实现0.1～0.2ns的时间传递以及半天内稳定度达到1×10-15～2×10-15的频率传递。在短期内,相比于5min间隔的卫星钟差产品,利用30s间隔的卫星钟差产品能较明显地提高静态PPP钟差解所体现的频率稳定度,PPP钟差解的精度略有提高;在长期内,使用这两种钟差产品获得的PPP钟差解的精度及其所体现的频率稳定度相当。

A time and frequency transfer experiment based on the precise point positioning （PPP） technique was carried out using IGS 5 rain and 30 s interval precise satellite clock products. The results demonstrate that the precision of time transfer based on PPP technique is up to 0.1-0.2 nanosecond and a frequency stability of 1 × 10-15 -2 × 10-15is derived for averaging times of half-day, whether using IGS 5 rain or 30 s interval precise satellite clock products. The results also indicate that whereas by using 30 s interval precise satellite clock products we could get a clearly improved frequency stability over that derived by using a 5 rain interval precise satellite clock products in the short term. There is no significant im- provement in the long term.