摘要
卫星导航接收机中的多径信号,尤其是长距多径信号会造成伪码的错误捕获与跟踪,带来很大的伪距测量误差,甚至定位失效。针对这一问题,利用卫星导航系统中独有的直达信号相对于多径信号具有最超前码相位的特性,在导航信号捕获跟踪之后,继续通过相关峰前向搜索的方法来判别直达信号与多径信号,在剔除多径分量之后获得准确的伪距测量值。在此基础上讨论了长距多径信号的搜索区间,给出了新的接收机处理架构,从而为卫星导航中长距多径信号的去除与精确定位的实施提供了重要参考。
The multipath signals coming into GNSS （global navigation satellite system）, especially the long-distance multipath signals, may result in wrong capture and tracking for PN （pseudo noise） of the navigation signal, which may bring about the large pseudo-distance detection error, or even location invalidation. The direct path signal relative to multipath one can be discriminated on the basis of characteristic of most leading PN code phase in more direct path of the GNSS than that of the multipath. After the normal capture and tracking procedure, the forward searching for the leading element continues for the new correlation-peak. If there is a new one, the more accurate pseudo-distance can be gotten by eliminating the long distance multipath signal. The searching interval for this signal is discussed and the new architecture for the receiver is designed. It is the new reference for long distance muhipath signal elimination and precise location in GNSS.
出处
《现代电子技术》
北大核心
2015年第5期159-162,共4页
Modern Electronics Technique
关键词
长距多径信号
最超前码相位
前向搜索
多径信号判别
全球卫星导航系统
long distance muhipath signal
most leading PN code phase
forward searching
multipath signal discrimination
GNSS
