基于RTKLIB的精密单点定位精度分析

Precision Analysis of Precise Point Positioning Based on RTKLIB

为研究测站的经度或纬度位置对定位结果产生的影响,该文选取大致沿赤道,120°经线分布的10个IGS站,获取7天的观测数据,在RTKLIB现有框架的基础上进行静态、静态模拟动态试验,坐标系为ITRF坐标。研究发现,中高纬度地区的测站三维各方向静态定位收敛时间比较平均,在赤道附近的测站表现出了明显的三方向收敛时间的差异,并且纬度越低的测站,粗差剔除率越高;大部分测站都能达到三维6cm的静态定位精度;在动态定位方面,低纬测站的Z方向定位精度(2~3cm)比高纬测站的Z方向定位精度(4~7cm)高,经度差异产生的影响比较小。

In order to study the effect on positioning results by longitude or latitude position,10 IGS stations distributed along the equator and 120°longitude are selected to obtain 7-days observation data.The static and static simulation dynamic tests are carried out on the basis of existing RTKLIB framework,and the coordinate system is ITRF coordinate.It is found that the convergence time of three-dimensional static positioning of stations in middle and high latitudes is relatively average,and the stations near the equator show obvious difference in three-dimensional convergence time.The station is in lower latitude,the gross error rejection rate is higher;Most stations can achieve static positioning accuracy of three-dimensional 6 cm;In the dynamic positioning,the Z direction positioning accuracy of low-latitude stations(2~3 cm)is higher than that of high latitude station in Z direction(4~7 cm),and the influence of longitude difference is relatively smaller.