基于加权几何精度因子(WGDOP)的地基导航系统评价方法

Evaluating Foundations Navigation System Based on Weighted Geometric Dilution of Precision

摘要:

为了评价卫星导航系统中位置估计的性能,GDOP作为一种衡量测量误差和定位误差之间几何关系的评价方法被广泛应用;由于地基导航系统各个单元的测量误差不同,且受用户距离影响不可忽略,需要对与距离有关的评价标准进行研究；因此,提出使用WGDOP代替GDOP作为评判标准,从分析地基导航系统误差方差入手,对WGDOP表达式进行详细分析,通过系统比较两种定位因子,说明采用WGDOP作为地基导航系统基站布设评价标准,准确性高;研究结果表明,采用加权几何精度因子作为评价标准,可以更适应地基导航系统的实际使用环境,对系统定位性能进行更精确的评价,对精度因子评估有明显改善。

Abstract:

In order to evaluate the performance of position estimation in satellite navigation systems, GDOP is widely used as an evaluation method to measure the geometric relationship between measurement error and positioning error. Because the measurement error of each unit of the foundation navigation system is different and the influence of the user distance is not negligible, it is necessary to study the distance-related evaluation standard. Therefore, it is proposed to use WGDOP instead of GDOP as the criterion, and from the analysis of the variance of the foundation navigation system error, the WGDOP expression is analyzed in detail. By comparing the two positioning factors, the WGDOP is used as the foundation navigation system base station to set the evaluation standard and improve the accuracy. The results show that the weighted geometric accuracy factor can be used as the criterion to evaluate the actual use environment of the foundation navigation system, and the accuracy of the system positioning performance is improved.