电离层强闪烁对接收机可用性的影响分析

Analysis of Strong Ionospheric Scintillation Effects on Availability of Receiver

为深入分析电离层强闪烁对导航接收机可用性性能的影响,通过构建电离层强闪烁的统计模型,并将该模型通过软件接收机捕获、跟踪环路,经过量化数值仿真分析,得出强闪烁对导航接收机载波相位、载噪比以及码相位的影响,接收机载噪比出现的快速衰落将显著地影响接收机对可见信号的捕获跟踪性能。对比分析无闪烁和强闪烁条件下对接收机可用性能够得出,强闪烁条件破坏了可见星座的跟踪持续性,造成可见测距的失锁,严重影响了可用性能。

To analyze quantificationally the ionospheric scintillation effects of receiver tracking loop,based on the equivalentchannel model of signal transfer under scintillation condition,the scintillation effect on the signal amplitude,phase of carrier andcode,carrier noise ratio are simulated and analyzed. The results show that the causes fast signal fading,shading of carrier noise ra-tio,dB reduce of carrier noise ratio in badly,and makes the positioning accuracy worse.