IGS卫星钟差产品采样间隔对PPP收敛速度的影响分析

比较和分析了使用IGS5min、IGS30s以及CODE30s、CODE5s4种精密卫星钟差产品对精密单点定位(precise point positioning,PPP)精度及其收敛性的影响。在达到同等精度水平时,使用30s和5s采样率的钟差产品,其收敛时间要明显短于5min的精密钟差产品。

Impacts of Sampling Rates of IGS Satellite Clock on Convergence of Precise Point Positioning

Both static and kinematic tests were investigated by using IGS 5 min,IGS 30 s,CODE 30 s and CODE 5 s-interval precise satellite clock product in precise point positioning (PPP) solution.Test results show that the sample rate of IGS satellite clock has little effect on the static PPP solution.Using a higher sampling rate can achieve high precision in a short time but they can all obtain the same precision nearly with the time going.While in the kinematic PPP,the sample rate of satellite clock has a significant impact on the PPP solution.The higher the interval of satellite clock is used,the better accuracy it can achieve.The accuracy of kinematic PPP achieved by using 30 s-interval precise satellite clock is improved by nearly 40%-50% in the plane and 20%-30% in the vertical direction with respect to the solution by using 5 min-interval precise satellite clock.While using 5 s and 30 s-interval satellite clock almost produce the same accuracy of kinematic solution.When achieve the same precision,the time to get convergence by using 30 s and 5 s-interval clocks is shorter than that of using 5 min-interval clock significantly.