改进窄相关的短多径抑制方法  

Modified Narrow Correlator Spacing Method for Mitigation Short-Delay Multipath

作　　者：高燕[1] 李擎[1] 

机构地区：[1]北京信息科技大学智能控制研究所,北京100101

出　　处：《测控技术》2014年第1期43-46,50,共5页Measurement & Control Technology

基　　金：国家自然科学基金资助项目(61031001;60972118);北京市创新人才资助项目(PHR201106226;PHR201006115);科技创新平台资助项目(71F1210907;5028123300);"十二五"装备预先研究基金资助项目(40405100304;9071223301)

摘　　要：在全球定位系统(GPS)中,多径效应严重影响着定位精度。虽然已经提出很多抑制多径的方法,但它们对短多径均无效。为了抑制短多径,在传统窄相关器的基础上,提出额外增加一个相关器,用于对窄相关的短多径误差进行定量估计并实时修正。此相关器是一个独立的相关器并不参与码跟踪过程,因此这个多径误差估计过程不会影响跟踪过程,也不存在硬件上的改动,所以很容易实现。最后用Matlab对算法进行了仿真,验证了该算法对短多径有很好的抑制作用。The muhipath effect greatly reduces the positioning precision in global positioning system（ GPS）. Al- though many methods have been proposed to mitigate the muhipath, they are ineffective for short-delay mul- tipath mitigation. In order to mitigate the muhipath, a method is proposed to estimate and eliminate the short- delay multipath error in real-time by adding an additional correlator in the traditional narrow correlator spac- ing. The additional eorrelator doesn＇t involve in the code tracking process, so the error estimation process doesn＇t affect the code tracking and the hardware doesn＇ t need to be modified, which is very easy to imple- ment. This algorithm is simulated by Matlab, the effectiveness of the method for short-delay multipath mitigation is verified.

关 键 词：短多径 窄相关技术 DLL GPS 

分 类 号：P228.4[天文地球—大地测量学与测量工程]