计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2013年
7期
136-139
,共4页
最大似然估计%多径干扰%超前/滞后斜率%多径误差包络%二进制偏移载波
最大似然估計%多徑榦擾%超前/滯後斜率%多徑誤差包絡%二進製偏移載波
최대사연고계%다경간우%초전/체후사솔%다경오차포락%이진제편이재파
maximum likelihood%multipath interference%Early/Late Slope(ELS)%multipath error envelope%Binary Offset Carrier(BOC)
针对卫星导航接收机容易受多径信号干扰的影响,提出了一种基于最大似然估计的加权 ELS(超前/滞后斜率)技术 BOC 多径减弱方法.该方法先经过最大似然估计得到直射信号估计值,再检测多个 BOC 信号自相关函数峰两边的斜率,可以有效地减小多径信号对环路的影响,性能优于传统的窄相关技术和 ELS 技术,并且只增加较少的计算复杂度.通过对 BOC(10,5)的多径误差包络仿真分析表明:该方法能有效减小多径干扰引起的跟踪误差.
針對衛星導航接收機容易受多徑信號榦擾的影響,提齣瞭一種基于最大似然估計的加權 ELS(超前/滯後斜率)技術 BOC 多徑減弱方法.該方法先經過最大似然估計得到直射信號估計值,再檢測多箇 BOC 信號自相關函數峰兩邊的斜率,可以有效地減小多徑信號對環路的影響,性能優于傳統的窄相關技術和 ELS 技術,併且隻增加較少的計算複雜度.通過對 BOC(10,5)的多徑誤差包絡倣真分析錶明:該方法能有效減小多徑榦擾引起的跟蹤誤差.
침대위성도항접수궤용역수다경신호간우적영향,제출료일충기우최대사연고계적가권 ELS(초전/체후사솔)기술 BOC 다경감약방법.해방법선경과최대사연고계득도직사신호고계치,재검측다개 BOC 신호자상관함수봉량변적사솔,가이유효지감소다경신호대배로적영향,성능우우전통적착상관기술화 ELS 기술,병차지증가교소적계산복잡도.통과대 BOC(10,5)적다경오차포락방진분석표명:해방법능유효감소다경간우인기적근종오차.
@@@@Focusing on the problem that the performance of a GNSS receiver is susceptive to the multipath signals, a multipath mitigation method based on the maximum likelihood method and the ELS(Early/Late Slope)technique for Binary Offset Carrier (BOC)modulated signal is presented. By being estimated the direct path signal and computing the slope at both sides of several peaks of the autocorrelation function, a good multipath mitigation effect is presented. Its performance is better than the traditional narrow correlator technique and the ELS technique. It also introduces little computational complexity. Simulations of the mul-tipath error envelope for BOC(10, 5)signals are performed. The simulation results show that the proposed method can suppress the tracking error induced by the multipath signals efficiently.
