区域对流层约束的BDS-3 PPP性能分析

Performance analysis of regional tropospheric constrained BDS-3 precise point positioning

针对PPP定位解算过程中收敛时间较长的问题,提出一种附加区域对流层延迟模型值约束PPP的方法,利用电力北斗精准位置服务网湖南区域的16个基准站观测数据,构建区域对流层延迟模型,通过对流动站HNYZ和CZZX的PPP定位实验,分别从PPP定位精度、收敛时间、模糊度参数和观测模型几何强度等方面,对该算法的改进效果进行了对比分析。实验结果表明,该算法具有更好的PPP模型几何强度,可以显著地改善高程方向的定位性能,静态模式下,收敛时间分别提升18.23%和12.96%,定位精度分别提升8.79%和1.87%;动态模式下,收敛时间分别提升7.32%和6.78%,定位精度分别提升6.07%和20.53%。

To address the problem of long convergence time of PPP.This paper proposes an approach to constrain PPP with additional regional tropospheric delay model values.It utilizes observation data from 16 reference stations in the State Grid Location Based Service Corporation's Beidou Precision Service Network in the Hunan region to construct a regional tropospheric delay model.Through PPP positioning experiments for rover stations HNYZ and CZZX,improvements brought about by this algorithm are compared and analyzed in terms of PPP positioning accuracy,convergence time,ambiguity parameters,and observation model geometry strength.Experimental results indicate that this algorithm demonstrates superior PPP model geometry strength,significantly enhancing elevation-direction positioning performance.Under static conditions,the convergence time improves by 18.23%and 12.96%,and positioning accuracy improves by 8.79%and 1.87%,respectively,for HNYZ and CZZX.Under dynamic conditions,the convergence time improves by 7.32%and 6.78%,while positioning accuracy improves by 6.07%and 20.53%,respectively.