附加先验信息约束的BDS-3精密授时算法

BDS-3 Precision Timing Algorithm with Additional Prior Information Constraints

考虑到高性能原子钟的高稳定性及对应站钟钟差序列历元间强相关等特点,对接收机钟差附加先验信息约束进行精密单点定位授时测试。基于BDS-3的B1C/B2b观测信息测试结果表明,相比于传统授时模型,附加先验信息的精密授时模型具有更高的授时性能,尤其是短期稳定性提升效果可达60%。此外,BDS-3的B1I/B3I和B1C/B2b组合观测值PPP精度基本相当,均可获得水平方向优于0.5 cm、高程方向约2 cm的定位精度;得益于B1C/B2b更高的观测数据质量,其定位精度较B1I/B3I组合提高13.8%。

Considering the high stability of high-performance hydrogen clocks and the strong correlation between clock offset series epochs,the receiver clock offset with additional prior information constraint is tested for precise point positioning(PPP)timing.The results based on B1C/B2b combination of BDS-3 show that compared to traditional timing models,the precision timing models with additional prior information have higher timing performance,especially for the short-term stability which has an improvement up to 60%.In addition,the PPP accuracy of B1I/B3I and B1C/B2b combinations of BDS-3 is basically equivalent,which can achieve positioning accuracy better than 0.5 cm and about 2 cm in horizontal and vertical direction,respectively.Owing to the better observation data quality of B1C/B2b,the positioning accuracy is improved by 13.8%compared to the B1I/B3I combination.