改进的MEDLL技术在多径误差估计中的应用  

Application of improved MEDLL technique in multipath error estimation

作　　者：张梦尧 陈熙源 ZHANG Mengyao;CHEN Xiyuan(School of Instrument Science and Engineering/Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学仪器科学与工程学院/微惯性仪表与先进导航技术教育部重点实验室

出　　处：《导航定位学报》2019年第3期96-101,共6页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(51375087);江苏省科技成果转化专项资金项目(BA2016139)

摘　　要：针对高精度卫星导航和定位应用中易出现多路径误差的问题,在分析多径效应形成和模型基础上,提出基于改进多路径延迟锁定环(MEDLL)技术的多径误差消除方法:设定接收信号中最大路径路数,并进行余量估计;然后通过估计出多路径信号的路数、幅值误差、传播延时和相位偏移,得到直达信号。实验结果表明,在同等定位精度要求条件下,该方法相对传统的MEDLL技术可有效提高直达信号估计效率,缩短所需时间。Aiming at the problem that it is susceptible to multipath errors for the application of accurate satellite navigation and positioning,the paper proposed a multipath error elimination method based on improved MEDLL(multipath elimination delay locked loop)technology with the analysis of multipath effect formation and model:the maximum number of paths in the received signal was set,and the allowance estimation approach was performed;then the direct signal was obtained by estimating the path number,amplitude error,propagation delay and phase offset of the multipath signals.Experimental result showed that compared with the traditional MEDLL technology,the proposed method could effectively improve the estimation efficiency of the direct signals and shorten the required time under the same positioning accuracy requirements.

关 键 词：北斗卫星导航系统 多路径效应 多路径消除延迟锁定技术 余量估计 仿真验证 

分 类 号：P228[天文地球—大地测量学与测量工程]