Galileo空间信号误差和标准定位性能初步分析

具体分析导航定位精度各类影响因素的大小，进而评估Galileo定位性能，为Galileo导航定位用户和系统下一步建设提供参考。以精密轨道和钟差产品作为参考，分析广播星历轨道精度钟差精度，并统计分析两者对用户定位的综合影响，即空间信号误差（URE）的大小。结果显示，轨道误差的均方根误差切向在2 m以内、法向在1 m以内、径向优于0.5 m，钟差均方根在3 ns以内，URE(1 σ)约为0.82 m。仿真分析全球Galileo卫星的可见性及位置精度衰减因子（DOP）值的大小，并采用实测数据对用户环境设备误差（UEE）的主要成分进行分析和统计。分析评估Galileo系统的标准定位性能，在全球范围内标准三维定位精度（1 σ）为3.8～6.4 m。

Preliminary Analysis of Galileo Signal in Space Error and Standard Positioning Performance

Galileo signal in space error and standard positioning performance analysis provides reference for use and the next construction. First, broadcast ephemeris orbital accuracy and clock accuracy, as well as URE, are analyzed by using precise orbit and clock file as reference. The results show the RMS of along-track error is less than 2 m, cross-track error is less than 1 m, radial error is less than 0.5 m, clock error is less than 3 ns, and the value of URE(1σ) is 0.82 m. Second, the Galileo satellite’s visibility and the value of PDOP are studied, and each part of UEE is calculated using the measured data. Finally, the standard positioning performance of the Galileo system is analyzed and its three-dimensional positioning accuracy (1σ) is found to be around 3.8 m-6.4 m.