扩频测距系统中多径信号伪码跟踪误差分析及消除技术  

Analysis and Mitigation of the Code Tracking Error Caused by Multipath in Spread-Spectrum Ranging Systems

作　　者：刘荟萃[1] 许晓勇[1] 王飞雪[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院卫星导航研发中心,湖南长沙410073

出　　处：《全球定位系统》2005年第6期34-38,共5页Gnss World of China

基　　金：新世纪优秀人才支持计划资助(NCET)

摘　　要：多径是扩频测距系统的主要误差源之一。介绍了多路径存在条件下码跟踪误差产生的机理,然后对常见的三种多径消除技术-窄相关、Early Late Slope(ELS)和Multipath Esti-mating Delay Lock Loop(MEDLL)-的原理进行了分析,通过对其性能的仿真与分析比较,指出:在存在多路径干扰时,增加码跟踪环路的相关器数目有助于提高码跟踪的精度,但在一定的处理条件下,码环处理数据的实时性会下降。Multipath is one of the major sources in the Spread-spectrum ranging systems. ＂the causation of the code tracking error in the presence of multipath is presented , and through the analysis and comparison of the principles and performances of three well-known multipath mitigating technologies, which are narrow-correlator. Early Late Slope （ELS） and Multipath Estimating Delay Lock Loop （MEDLL）, it is concluded： increasing the number of correlators of the code tracking loop can reduce the tracking error in the presence of multipath, but in determinate process conditions,the processing speed is also reduced.

关 键 词：扩频测距 多径误差 窄相关 ELS MEDLL 

分 类 号：P207.1[天文地球—测绘科学与技术]