BOC调制信号抗多径双环估计方法

双环估计方法是为了解决全球卫星导航系统中二进制偏移载波(binary offset carrier, BOC)调制信号模糊跟踪问题所提出的一种码相位估计方法。为了提高双环估计方法的抗多径性能,将双环估计中本地产生的伪随机码转变为仅在码片边沿出现的双极性归零码,从而使得二维相关函数具有更尖锐的二维相关峰值,进而使得双环估计具有较强的抗多径性能。理论上重点分析了本文所提方法在带限条件下的抗多径性能,并进行了仿真实验。结果表明,相对于现有方法,本文所提方法能够同时实现对BOC调制信号的无模糊、抗多径、抗低载噪比的相位估计。

Antimultipath dualestimate loop method for BOC modulated signals

The dual-estimate method has been proposed to solve the ambiguous tracking problem for binary offset carrier (BOC) modulated signals in global navigation satellite system. In order to improve the anti-multipath performance of the dual-estimate method, the local generated pseudo-random code is designed to be bipolar zero-return code which appears at each edge of the code chip. Herein the obtained two-dimensional correlation function would get a sharper correlation peak, and the dual-estimate method would get a stronger anti-multipath performance. The anti-multipath performance is analyzed in the band limited condition theoretically, then a simulation experiment is also given. The result shows that the proposed method can achieve an unambiguous, anti-multipath and anti-low carrier-to-noise ratio estimation for BOC modulated signals compared with the existing methods.