基于小波滤波及载噪比估计的GPS接收机多径抑制  

Multipath Mitigation of GPS Receivers Based on the C/N_0 Estimation and Wavelet Method

作　　者：耿福泉[1] 赵昀[1] 黄智刚[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《东北大学学报（自然科学版）》2016年第3期327-332,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(61101075;61271197)

摘　　要：为了抑制城市环境GPS(global positioning system)导航应用中由复杂信号反射引起的多径效应,提出了一种基于假设检验小波阈值滤波处理并联合载噪比估计的GPS接收机多径抑制方法.这种方法作用于GPS导航接收机的码和载波跟踪环路,通过估计由多径引起的跟踪误差,补偿伪距估计量,进而消除多径效应引起的定位误差.仿真实验结果表明,对于城市环境典型导航应用的多径场景,所提出的方法显著改善用户定位精度,能够将定位误差从标准接收机处理下的15.95 m降至1.75 m,而计算量无明显增加.To mitigate the multipath effects caused by the complex signal reflection of urban application environments in GPS receivers, a multipath mitigation method based on a hypothesis testing wavelet thresholding filter and the carrier-to-noise density ratio （C/N0 ） estimation was proposed. This technique was integrated into the code and cartier tracking loops, which estimated the multipath tracking errors by the wavelet thresholding filtering based on the C/N0 estimation, and then removed the positioning errors in multipath environments by compensating the pseudorange measurements. The simulation tests were conducted in the typical multipath scenario under urban navigation environments, whose results showed that the statistical positioning error can be reduced from 15.95 m with the standard receiver processing to 1.75 m with the proposed method, which indicated that the proposed method achieves a significant improvement of positioning accuracy without an obvious additional computation load.

关 键 词：GPS(global POSITIONING system) 多径抑制 小波阈值滤波 假设检验 多径跟踪误差 

分 类 号：TN967.1[电子电信—信号与信息处理]