基于SLR与L波段同步观测解算北斗卫星钟差

Calculation of COMPASS satellite clock bias using SLR and L-band simultaneous observation data

导航卫星钟差的大小通常在毫秒量级,若不进行精密修正,对卫星导航定位精度的影响很大。本文阐述了综合利用SLR观测值和北斗L波段单频伪距观测值对BDS卫星钟差进行解算的原理和计算方法。采用2014年8月及9月从长春SLR和GNSS并址站采集的激光测距观测值和北斗L波段单频伪距观测值计算了COMPASS-G1的卫星钟差,以GFZ分析中心提供的COMPASS-G1卫星钟差为参考进行对比,互差在6 ns之内,表明使用该方法计算COMPASS-G1卫星钟差是可行的。

The clock bias of navigation satellite is usually millisecond level,and the positioning accuracy of navigation will be affected obviously if the clock bias is not precisely corrected. The principle and calculating method of the BDS satellite clock bias based on SLR and L-band pseudo-range co-location data were described. The clock bias of COMPASS-G1 was computed using the observation data of September 2014 provided by Changchun Observatory. The clock bias is compared with the reference clock bias offered from GFZ. Comparison and analysis results show that the difference of two COMPASS-G1 clock biases is less than 6 ns. It shows that this calculating method of BDS satellite clock bias in this paper is feasible.