多路径对精密单点定位的影响研究

Research on the Effects of Multi-path on Precision Point Positioning

精密单点定位中的钟差、电离层延迟、对流层延迟等误差可以得到精确修正,但是多路径难以进行有效的改正。不同材质的强多路径环境与弱多路径条件下的实验结果表明:多路径对长时间观测的定位精度影响不大,但是对短时间内的收敛时间有较大的影响。然后分析多路径的周日重复特性,并采取设置一定的截止高度角、滤波等方式削弱多路径的影响。

The errors such as clock error,ionospheric delay and tropospheric delay in precise point positioning(PPP)can be accurately corrected,but multipath is difficult to correct effectively.The experimental results of strong multipath environment and weak multipath environment of different materials show that multipath has little effect on the positioning accuracy of long-time observation,but has a great influence on the convergence time in a short time.Then,the Sunday repetition characteristic of multi-path is analyzed,and the influence of multi-path is weakened by setting a certain cutover height angle,filtering and so on.