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
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摘要: 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。Abstract: A time and frequency transfer experiment based on the precise point positioning(PPP)technique was carried out using IGS 5 min 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 min 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 min interval precise satellite clock products in the short term.There is no significant improvement in the long term.
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