常用电离层模型对单点定位精度的影响分析

Analysis of the Influence of Commonly Used Ionospheric Model on Single Point Positioning Accuracy

电离层延迟是限制GNSS定位精度的主要误差源之一,采用合理的电离层改正模型能够削弱定位误差。本文对Klobuchar模型、GIM模型以及NTCM-BC模型的原理进行了阐述,并以九峰台站2016-01-07~2016-01-09观测数据为对象,从不同的角度对BDS K8、GPS K8、GIM和NTCM-BC电离层模型对单点定位的精度的改正效果进行了分析。实验结果表明,九峰台站处,GPS K8和BDS K8模型改正后的单点定位误差RMS分别为2.8553m和1.7932m,NTCM-BC模型改正后的单点定位误差RMS为1.7290m,GIM模型改正后的单点定位误差RMS为1.2834m。

Ionospheric delay is one of the main sources of error that limits the accuracy of GNSS positioning,and using a reasonable ionospheric model can weaken the error of GNSS positioning.In this paper,the principles of Klobuchar model,GIM model and NTCM-BC model are expounded,and the effects of BDS K8,GPS K8,GIM and NTCM-BC ionospheric models on the accuracy of single point positioning are analyzed from different angles in the observation data of JFNS station on 2016-01-07~2016-01-09.The experimental results show that the error of single point positioning error corrected by GPS K8 and BDS K8 model is 2.3099 m and1.7233 m respectively.The error of single point positioning error corrected by NTCM-BC model is 1.7803 m.The error of single point positioning error corrected by GIM model is 1.224 m.