北斗卫星伪距偏差模型估计及其对精密定位的影响

发布时间：2018-04-21 10:24

本文选题：北斗卫星导航定位系统 + 伪距偏差　；参考：《武汉大学学报(信息科学版)》2017年10期

【摘要】：现阶段北斗卫星导航系统(BeiDou navigation satellite system,BDS)的同步地球轨道(geostationary orbits,GEO)卫星、中倾斜地球同步轨道(inclined geo-synchronous orbits,IGSO)卫星和中圆地球轨道(medium earth orbit,MEO)卫星均存在伪距偏差,该伪距偏差的存在对精密定位的研究及其应用产生了较大的影响。根据北斗IGSO和MEO卫星的伪距偏差与高度角和频率相关的误差特性,本文分析了测站数目及分布,以及观测时长对建模的影响,选择18个测站2015年全年的数据作为MEO卫星的建模数据,其中可以连续观测到全弧段IGSO卫星的4个测站用于IGSO卫星的建模,采用加权分段线性拟合联合抗差估计的方法建立了北斗卫星伪距偏差改正模型。模型改正后,北斗IGSO和MEO卫星的伪距偏差得到明显的削弱,相比于传统的伪距偏差改正模型,精密单点定位(precise point positioning,PPP)的定位精度和收敛时间均得到提升。
[Abstract]:At present, the geostationary orbital geo-geo satellite of BeiDou navigation satellite system BDS, the medium-tilt geostationary geo-synchronous orbitsIGSO satellite and the medium earth orbital MEO satellite have pseudo-range deviations. The existence of the pseudo-range deviation has a great influence on the research and application of precision positioning. According to the error characteristics of the pseudo-range deviation of Beidou IGSO and MEO satellites related to altitude angle and frequency, the number and distribution of observation stations and the influence of observation time on modeling are analyzed in this paper. The data of 18 stations for the whole of 2015 are selected as modeling data of MEO satellite, in which 4 stations of IGSO satellite in the whole arc can be observed continuously for modeling of IGSO satellite. Based on weighted piecewise linear fitting combined with robust estimation, a pseudo-range correction model of Beidou satellite is established. After the model correction, the pseudo-range deviation of Beidou IGSO and MEO satellites is obviously weakened. Compared with the traditional pseudo-range error correction model, the precision and convergence time of precise single-point positioning are improved.
【作者单位】：武汉大学测绘学院;
【基金】：国家自然科学基金(41474025) 湖北省自然科学基金重点项目(杰青)(2015CFA039)~~
【分类号】：P228

【相似文献】