电离层色散特性对导航信号接收的影响

电离层是一种典型的色散介质,会对导航信号产生延迟,且不同频点处的电离层延迟互不相同。实际应用中通常只考虑接收信号中心频点处的电离层延迟,而忽略信号带宽范围内的电离层色散特性。建立了电离层色散特性的对导航信号接收的影响分析模型,并定量地分析了电离层色散效应对BPSK(10)、BOC(14,2)以及AltBOC(15,10)等宽带导航信号的影响。分析表明电离层色散效应对BPSK(10)信号的影响可忽略不计,对高阶BOC信号会产生一定程度的与电离层特性相关的相关损耗及载波跟踪偏差,其中AltBOC(15,10)产生的相关损耗最高约1.4dB,载波相位跟踪偏差最高约0.374π。

Effect of ionosphere dispersion on the navigation signal receiving

Ionosphere is a typical dispersive medium, which will import frequency depended delay to navigation signal. In the practical applications, the Ionosphere delay between signals at different frequency is considered only, while the effect of ionosphere dispersion on the receiving for a single navigation signal is usually ignored. In this paper, a module is established to analysis the effect of ionosphere dispersion. Base on this module, the effect of ionosphere dispersion on some typical wide-band navigation signals is analyzed, such as BPSK(10),BOC(14,2),AltBOC(15,10) signals. The analysis results indicate that the effect on BPSK(10) signal can be ignore, but some correlation loss and carrier phase tracking error will be introduced into the track of high order BOC signals, such as BOC(14,2) signal and AltBOC(15,10) signal, the correlation loss and carrier phase tacking error of AltBOC(15,10) can be 1.4dB and 0.185 cycles separately.