GPS/BDS/GLONASS三系统组合定位的先验权比研究

Study on Priori Weight Ratio of Combined GPS/BDS/GLONASS System

为满足多星座GNSS系统实时动态定位解算的需求,本文通过先验定权的方式,对GPS/BDS/GLONASS三系统在伪距单点定位和载波相位相对定位时合适的权比进行探索。基于北斗系统的现有星座条件,采集三系统的数据进行实验,实验结果表明:三系统组合定位时,伪距观测值的先验权比定为4:3:1,相位观测值权比定为4:3:3,能够得到比GPS单系统和GPS/BDS组合更优的定位结果。

To meet the demand for getting real-time dynamic positioning solutions of multi-GNSS systems,this paper firstly deduced the mathematics models of the combination of three systems,then gave the prior weight of the three systems by the way of assigning the initial variance to research the reasonable ratio of weight of pseudorange positioning and phase relative positioning.Based on the existing BDS constellation,we collect data using the receiver of three systems to do the experiment.The result indicates that the ratio of weight of pseudorange positioning is 4:3:1,and 4:3:3 for phase relative positioning,the positioning results are better than GPS system and GPS/BDS two systems.