多系统卫星融合定位数据的稳定性和精度比较分析

摘要

This paper discusses the mathematical model of GNSS multi system fusion positioning and analyzes the error handling strategies and parameter estimation methods.Based on the RTKLIB software of Tokyo Ocean University in Japan, the GPS, GLONASS, Galileo, BDS multi-system fusion location test is carried out, and the dynamic/static positioning stability and precision are analyzed.The experimental result shows that:compared to the convergence time and GPS system integration GNSS system 30%~50% can be shortened;compared with GPS single system the positioning accuracy can be increased by 20%~50%.In addition, in the cut-off elevation angle greater than 40 degrees and the observation environment under adverse conditions, the insufficient number of visible satellite system can lead to the continuous positioning, but with multi-system integration the visible satellite positioning accuracy can still get better.This multi-system will be available for the buildings in dense areas, which has practical application value in mountainous areas and harsh conditions of serious satellite occlusion.%论述GNSS多系统融合定位的数学模型、分析各项误差处理策略以及参数估计方法,基于日本东京海洋大学RTKLIB软件进行GPS、GLONASS、Galileo、BDS多系统融合定位试验,并分析其动/静态定位稳定性和精度.试验结果表明:GNSS多系统融合收敛时间与GPS单系统相比缩短30%~50%,定位精度与GPS单系统相比可以提高20%~50%.此外,在卫星高度截止角大于40°和不利观测环境条件下,单系统可见卫星数不足,从而导致无法进行连续定位,但多系统融合可视卫星可获得比较好的定位精度,在建筑物密集区、山区和卫星遮挡较为严重的恶劣条件下具有实际应用价值.