顾及ISB参数的BDS-2/BDS-3精密单点定位性能分析

Performance Analysis of BDS-2/BDS-3 Precise Point Positioning Considering ISB Parameters

对北斗二号(BDS-2)B1I/B3I信号与北斗三号(BDS-3)B1I/B3I、B1C/B2a信号系统间偏差ISB参数的特性进行分析,分别使用B1I/B3I和B1C/B2a信号进行BDS-2/BDS-3静态和动态精密单点定位(PPP)性能评估。实验结果表明,BDS-2与BDS-3 B1C/B2a信号之间的ISB参数大于B1I/B3I信号,且均具有较好的天内和天间稳定性;与单BDS-2相比,BDS-2与BDS-3组合可显著提升静态和动态PPP的性能,收敛时间缩短51.9%以上,定位精度提升46.1%以上;与B1I/B3I信号相比,BDS-3 B1C/B2a信号参与PPP解算后收敛时间有所缩短;估计ISB参数后,BDS-2/BDS-3静态和动态PPP收敛时间分别缩短8.8%和12.6%,定位精度均提升7.1%。

This paper analyzes the characteristics of the inter-system bias(ISB)parameters of Beidou-2(BDS-2)B1I/B3I and Beidou-3(BDS-3)B1I/B3I,B1C/B2a signals.It then evaluates BDS-2/BDS-3 static and kinematic precise point positioning(PPP)performance when using B1I/B3I and B1C/B2a signals alone.The experimental results show that the ISB parameters between BDS-2 and BDS-3 B1C/B2a signals are greater than those of B1I/B3I signals,and both have better intra-day and inter-day stability.Compared with single BDS-2,the combination of BDS-2 and BDS-3 can significantly improve the positioning performance of static and kinematic PPP,the convergence time is shortened by more than 51.9%,and the positioning accuracy is improved by more than 46.1%.Compared to B1I/B3I signal,the convergence time of PPP is shortened when the BDS-3 B1C/B2a signal participates in the PPP solution.When the BDS-2/BDS-3 ISB parameters are estimated,the PPP convergence time in static and kinematic modes is shortened by 8.8%and 12.6%,respectively,and the positioning accuracy is improved by 7.1%.