ISB参数估计在BDS-2/BDS-3单点定位应用中的分析  

Analysis for ISB parameter estimation in BDS-2/BDS-3 single point localization application

作　　者：于海霞 YU Haixia(Shizuishan Institute of Surveying and Mapping Geographic Information,Shizuishan 753000,China)

机构地区：[1]石嘴山市测绘地理信息院,宁夏石嘴山753000

出　　处：《经纬天地》2024年第3期11-15,共5页Survey World

摘　　要：BDS-2和BDS-3之间存在的系统间偏差是影响其组合定位性能的重要因素,基于多个MGEX跟踪站数据,分析了随机游走ISB模型在BDS-2/BDS-3伪距单点定位与精密单点定位中的应用。实验结果表明:是否估计ISB对BDS-2/BDS-3 B1I和B3I单频伪距单点定位精度影响较小,最大影响量不到5%;是否估计ISB对BDS-2/BDS-3 B1I/B3I双频静态与动态精密单点定位精度影响较大;估计ISB相比未估计ISB在E、N、U 3个方向精度的提升量均在14%以上,其中E方向定位精度提升效果最为明显,静态精密单点定位最大提升量达到了44.9%。The intersystem bias(ISB)existed between BDS-2 and BDS-3 is an important factor affecting their combined positioning performance.Therefore,based on data from multiple MGEX tracking stations,the application of the random walk ISB model in BDS-2/BDS-3 pseudo-range single-point positioning and precise single-point positioning is analyzed in this article.The experimental results show that whether estimating ISB or not has a small impact on the accuracy of BDS-2/BDS-3 B1I and B3I single-frequency pseudo-range single-point positioning,with a maximum impact less than 5%.Whether estimating ISB or not has a significant impact on the accuracy of BDS-2/BDS-3 B1I/B3I dual-frequency static and dynamic precise single-point positioning,the estimated ISB has a greater improvement in accuracy than the unestimated ISB in all three directions of E,N and U,with the most significant improvement in the E direction,where the maximum improvement in static precise single-point positioning reached 44.9%.

关 键 词：系统间偏差 BDS-2/BDS-3 ISB模型 定位精度 

分 类 号：P228[天文地球—大地测量学与测量工程]