IGS快速/超快速卫星钟差精度评定与分析

Accuracy assessment and analysis of satellite clock bias from IGS rapid and ultra-rapid clock products

为了弥补IGS快速(IGR)和超快速(IGU)卫星钟差产品的精度分析研究的不足,在分析IGR和IGU卫星钟差特点的基础上,选用二次差序列对应的均方根值作为表征卫星钟差精度的指标,采用15min采样间隔的IGR和IGU卫星钟差数据,以对应的IGS最终精密星历卫星钟差为参考真值来进行钟差产品的精度评定。结果表明:卫星钟差产品的精度与卫星钟的类型有关,不同卫星钟的钟差精度存在较为显著的差异;不同类型卫星钟差产品的精度差异较大;随着GPS星载原子钟性能的提高,其卫星钟差预报的精度亦有所提高。

In order to supplement the insufficiency of the study on the accuracy analysis of IGS rapid(IGR)and ultra-rapid(IGU)satellite clock products,this paper evaluated the accuracy of the SCB data from IGR and IGU products with 15 min sampling interval,based on analyzing the products’characteristic,and by using the root mean square(RMS)value of the twice difference sequence corresponding to the SCB data as an indicator of accuracy,and choosing the corresponding precise SCB data from IGS final precise ephemeris as the reference truth value.Experimental results showed that the accuracy of SCB would be significantly different with different types of satellite clocks,and there would be obvious differences between the accuracy of different SCB products;moreover,the prediction accuracy of SCB could be improved with the improvement of corresponding satellite clock performance.