现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2015年
5期
159-162
,共4页
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
長距多徑信號%最超前碼相位%前嚮搜索%多徑信號判彆%全毬衛星導航繫統
장거다경신호%최초전마상위%전향수색%다경신호판별%전구위성도항계통
long distance multipath signal%most leading PN code phase%forward searching%multipath signal discrimina-tion%GNSS
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。
衛星導航接收機中的多徑信號，尤其是長距多徑信號會造成偽碼的錯誤捕穫與跟蹤，帶來很大的偽距測量誤差，甚至定位失效。針對這一問題，利用衛星導航繫統中獨有的直達信號相對于多徑信號具有最超前碼相位的特性，在導航信號捕穫跟蹤之後，繼續通過相關峰前嚮搜索的方法來判彆直達信號與多徑信號，在剔除多徑分量之後穫得準確的偽距測量值。在此基礎上討論瞭長距多徑信號的搜索區間，給齣瞭新的接收機處理架構，從而為衛星導航中長距多徑信號的去除與精確定位的實施提供瞭重要參攷。
위성도항접수궤중적다경신호，우기시장거다경신호회조성위마적착오포획여근종，대래흔대적위거측량오차，심지정위실효。침대저일문제，이용위성도항계통중독유적직체신호상대우다경신호구유최초전마상위적특성，재도항신호포획근종지후，계속통과상관봉전향수색적방법래판별직체신호여다경신호，재척제다경분량지후획득준학적위거측량치。재차기출상토론료장거다경신호적수색구간，급출료신적접수궤처리가구，종이위위성도항중장거다경신호적거제여정학정위적실시제공료중요삼고。
The multipath signals coming into GNSS(global navigation satellite system),especially the long?distance mul?tipath 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 mul?tipath. After the normal capture and tracking procedure,the forward searching for the leading element continues for the new cor?relation?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 refe?rence for long distance multipath signal elimination and precise location in GNSS.
