不同基准钟约束的卫星钟差精度分析

Accuracy analysis on satellite clock error with different reference clock constraints

为了提高GPS卫星钟差事后解算的精度和可靠性,提出通过选择氢钟、铯钟、铷钟等不同类别的原子钟作为测站基准钟进行约束,利用抗差估计方法进行卫星钟差精度解算,分析并比较以各类原子钟为基准钟的钟差产品的精度。基于抗差估计方法迭代计算等价权的特性,挑选出可得到高精度卫星钟差产品的基准钟。实验结果表明,氢钟更为适合抗差估计的数据处理方法,其精度相较于其他类型原子钟精度更高,可以在一定程度上提高卫星钟差产品的精度。

In order to improve the accuracy and reliability of the post-solution of GPS satellite clock errors,the paper proposed to select different types of atomic clocks such as hydrogen clock,cesium clock and rubidium clock as the reference clock constraints of station,the robust estimation method was used to calculate the accuracy of satellite clock errors,and the product accuracy of the clock errors referenced by various atomic clocks were analyzed and compared,then based on the characteristic of the equivalent weights of iterative calculation of the robust estimation method,the reference clock for obtaining high-precise products of satellite clock errors was selected.Experimental result showed that the hydrogen clock would be more suitable for the data processing of robust estimation with higher accuracy than other types of atomic clocks,which could help improve the accuracy of satellite clock error products in a certain degree.