窄带干扰抑制对载波相位测量零值影响分析

摘要

为研究窄带干扰抑制对卫星导航系统载波相位测量零值的影响,采用典型窄带干扰抑制算法的等效滤波模型进行分析,构建窄带干扰抑制下的载波相位测量零值偏差分析模型,推导载波相位测量零值偏差与等效滤波器的关系,并给出载波相位测量零值无偏性的条件.分析表明:等效滤波器为线性相位滤波器的窄带干扰抑制算法对载波相位测量零值没有影响,等效滤波器为非线性相位滤波器的窄带干扰抑制算法对载波相位测量零值的影响与等效滤波器的时域抽头系数直接相关.蒙特卡洛仿真给出了典型窄带抑制干扰算法在不同窄带干扰参数下对载波相位测量零值造成的偏差.%To explore the effect of narrowband interference suppression on carrier phase measurement zero value for satellite navigation system,this article establishes the equivalent filter model for classic NBIsuppression algorithm,and presents a study in order to analyze the effect of NBIsuppression on Carrier Phase bias.Then,the articlebuilds an analysis model of carrier phase zero value in the introduction of the NBIsuppression,works out the relationship between the carrier phase zero value bias and equivalent filter,and shows a condition for the unbiasedness of carrier phase measurement zero value.It is shown that linear phase filter has no effect on carrier phase zero value.Nonlinear phase filter has an effect on carrier phase zero value,which isdirectlyrelatedtothefilter weights.Based on the Monte Carlosimulation,thebiasvalue of carrier phase measurement zero value,which is simulated in the different parameter of the narrowband interference by using classic narrowband interference suppression algorithms,is obtained.