QZSS区域卫星导航系统性能分析

Performance Analysis of the QZSS Regional Satellite Navigation System

针对目前全球连续监测评估系统(iGMAS)对日本准天顶卫星系统(QZSS)性能评估分析研究较少的现状,从QZSS空间信号精度和QZSS增强GPS服务性能分析2个方面展开研究,分析QZSS系统广播轨道、钟差、空间信号测距误差(SISRE)精度以及在单QZSS系统、QZSS与GPS组合模式下的系统覆盖性和定位精度,并通过国际GNSS服务(IGS)实验跟踪网(MGEX)观测站的实测数据进行验证分析。结果表明,QZSS系统空间信号测距误差均优于1 m,轨道和钟差的天序列变化在-2 m—2 m之间波动;QZSS对GPS定位增强主要体现在北(N)和天(U)2个方向,精度提升比例分别为11.7%、22.6%,三维方向(3D)提升20.0%。

In view of the current situation that the international GNSS Monitoring and Assessment System(iGMAS)has less research on the performance evaluation and analysis of Japan's Quasi-Zenith Satellite System(QZSS),the research is carried out from the two aspects of QZSS signal-in-space accuracy and QZSS enhanced GPS service performance analysis.The accuracy of QZSS system broadcast orbit,clock error,signal-in-space ranging error(SISRE),the coverage and positioning accuracy of the single QZSS system and the combined mode of QZSS and GPS are analyzed.Finally,the measured data from observation stations of the international GNSS service(IGS)experimental tracking network(MGEX)are used for verification.The results show that the signal-in-space ranging error of QZSS is better than 1 meter,and the day series variation of orbit and clock error fluctuates between-2 and 2 meters;the enhancement of GPS position is mainly reflected in the north(N)and up(U)directions,with the improvement ratio of about 11.7%and 22.6%respectively,and 20.0%in the three-dimensional(3D)directions.