观测资料和卫星钟差对PPP参数收敛影响分析

Effect Analysis of Observations and Satellites Clock Bias on Convergence Behavior in PPP

在GPS单点定位中,参数解算的收敛时间和收敛稳定性是重要的研究内容之一,影响收敛时间和收敛稳定性的因素很多,本文主要就观测资料的不同采样间隔、卫星钟差资料的不同采样间隔、不同的定位精度要求对精密单点定位中参数收敛时间的影响进行了深入的分析探讨,以中国上海GPS综合应用网中的12个测站资料为例,分析了采样间隔、定位精度要求与收敛时间的关系,并对不同采样间隔的收敛时间进行了统计分析,得出一些初步结论.

In GPS Precise Point Positioning（PPP）,besides precise positioning,the convergence time and stability are important items in GPS kinematic PPP.There are many factors which may affect it,such as the quality of GPS observation,sampling intervals,parameters estimation model, satellite geometry distribution and accuracy requirement and so on.The effect of different sampling intervals of observations,Satellites Clock Bias（SCB）,and different positioning precision on convergence time of kinematic PPP is discussed deeply in this paper.Taking GPS observations from twelve GPS reference stations in Shanghai GPS network as an example,we analyzed the relationship of sampling intervals,positioning precision and convergence time.The convergence time of different sampling intervals is analyzed statistically.The results of the analysis are given in the conclusions.