一种基于BOC信号的多径抑制技术

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。

Multipath mitigation technique for BOC signals

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 multipath 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.