基于Helmert方差分量估计的GPS/BDS组合系统定权方法研究

为了提高GPS/BDS组合定位精度需求,该文采用高度角模型和等权模型进行初始定权,再利用Helmert方差分量估计法对GPS/BDS组合系统进行定权,通过计算组合系统的PDOP值和均方根值进行了实验分析。实验结果表明:高度角模型的精度均大于等权模型;GPS/BDS组合系统在三个方向上的定位精度,均高于单一系统定位精度;采用Helmert方差分量估计模型进行定权可再次提高组合系统精度。该方法为提高GPS/BDS组合系统定位的精度提供了参考。

Study on Weight Determination Method of GPS/BDS Combined System Based on Helmert Variance Component Estimation

In order to improve the accuracy requirement of GPS/BDS combination positioning, in this paper, the altitude angle model and equal weight model are used to determine the initial weights. Then, the Helmert variance component estimation method is used to determine the weights of GPS/BDS integrated system. The PDOP value and root mean square value of the combined system are calculated and analyzed by experiment. The experimental results show that the accuracy of altitude angle model is greater than that of equal weight model;The positioning accuracy of GPS/BDS integrated system in three directions is higher than that of single system, and the weighting of Helmert variance component estimation model can improve the accuracy of combined system again. This method provides a reference for improving the positioning accuracy of GPS/BDS integrated system.