导航接收机跟踪环路在电磁干扰下的效应律研究

Effect Law of Navigation Receiver Tracking Loop Under Electromagnetic Interference

针对在多源电磁干扰下导航接收机跟踪环路失锁规律研究不足的问题,对跟踪环路在双源电磁干扰下的失锁效应模型进行了研究.通过对电磁干扰下相关器输出的等效载噪比数学模型分析,建立了双源电磁干扰下导航接收机跟踪环路失锁的效应模型;然后搭建单源和双源电磁干扰的效应试验平台,对某型北斗导航接收机开展注入效应试验,试验过程中选取了4种不同的干扰信号组合,每种组合下又试验得到了不同的信号功率组合;最后利用试验数据验证了效应模型误差都在1.5 dB以内.该模型揭示了在导航接收机跟踪环路中,双源干扰与单源干扰之间的内在联系,对导航接收机效应规律的进一步研究具有指导意义.

In order to investigate sufficiently the lockout law of the navigation receiver’s tracking loop under multi-source electromagnetic interference,a model of the lockout effect of the tracking loop under dual-source electromagnetic interference was studied.Analyzing the mathematical model of the equivalent carrier-to-noise ratio of the correlator output under electromagnetic interference,a model of the tracking loop lockout effect under dual-source electromagnetic interference was established.Then an experiment platform was set up with a single-source and dual-source electromagnetic interference to carry out an injection experiment for the Beidou navigation receiver.During the experiment,four different combinations of interference signals were selected,and under the experiment of each combination,different signal power combinations were obtained.Finally,the experiment data were used to verify the effect model,showing the model errors all within 1.5 dB.This model reveals the internal relationship between dual-source and signal-source interference in the navigation receiver tracking loop,providing a guide for further research on the law of navigation receiver effect.