基于省级区域地基增强系统的北斗三号系统卫星数据评估分析

Evaluation and analysis of satellite data of the BDS-3 system based on provincial regional ground-based augmentation system

导航卫星观测数据质量是影响地面增强系统定位精度的直接因素,北斗地基增强系统经过北斗三号全球卫星导航系统(BDS-3)适配性改造后能够获取的卫星观测值数量相较北斗二号卫星导航系统(BDS-2)适配改造提升了30%~50%,对这些观测数据的质量评估和分析尤为重要.本文利用数据完整率、多路径误差等基准站观测值质量评估方法,使用零基线测试和精密单点定位(PPP)测试两种方法,提出一种综合区域地基增强系统的BDS-3数据分析方法.对研究区域进行实证试验,结果表明:BDS-3卫星在亚太地区的数据质量已经与GPS相当;由于BDS-3卫星空间分布结构更优,地面测站可以获得的高仰角(高度角>50°)可用观测值较单GPS提升了200%以上.

The quality of navigation satellite observation data is a direct factor that affects the positioning accuracy of ground augmentation system.The number of satellite observations obtained by BeiDou ground-based augmentation system after the adaptive transformation of Beidou-3 Navigation Satellite System(BDS-3)has increased by 30%−50%compared with the original Beidou-2 Navigation Satellite System(BDS-2).It is very important to evaluate and analyze the quality of these observations.In this paper,we propose a method to evaluate the quality of observation values of reference stations,such as analytical data integrity and multipath error,and use two methods such as zero-base line test and precise single point positioning test,to integrate the BDS-3 data analysis method of regional ground augmentation system.Based on this method,an empirical test was conducted in the study area.The results show that the data quality of BDS-3 satellites in the Asia-Pacific region has reached the same level as that of GPS.Due to the better spatial distribution structure of BDS-3 satellites,the available observation value of high elevation angle(altitude angle>50°)obtained by the ground stations has increased more than 200%compared with that of single GPS system.