基于伽利略卫星导航系统的多径误差仿真

Simulation of Multipath Error in Galileo Navigation Satellite System

着重讨论伽利略卫星导航系统中采用的线性偏移载波调制技术,对GAL ILEO中可能用到的几种信号的基本特性作具体分析,提出对于BOC信号,应采用余弦副载波调制方式。并在此基础上对GAL ILEO各种信号的多径误差、平均多径误差进行仿真验证。仿真结果表明,在参数相同的条件下,余弦副载波类型BOC信号的平均多径误差均优于同参数下的正弦副载波类型BOC信号的平均多径误差。

In GALILEO Navigation Satellite System, a new technology that was called linear offset carrier modulation would be taken. This paper analyzed this kind of modulation in time and frequency domain such as subcarrier waveform, power spectral density and autocorrelation function, and showed that cosine subcarrier signal was quite different from sine subcarrier signal. In the final paper multipatherror and average multipatherror were obtained by the simulation of several signals being used in GIOVE-A （Galileo In Orbit Validation Element）. The simulation result showed that average multipatherror of cosine subcarrier modulation signal was better than that of sine subcarrier modulation signal.