高阶BOC信号多区域鉴别器的无模糊多径抑制算法

传统的高阶BOC信号多径抑制算法的有效收敛区间较小，不利于信号的稳定跟踪，因此提出一种多区域鉴别器的高阶BOC多径抑制算法。在伪码误差为零的附近区域，采用优化的QStrobe多径抑制鉴别器，而在其他区域采用收敛区间较大的正交BOC鉴别器。利用卡尔曼滤波器对跟踪误差进行开环估计，判断误差所处区域并进行鉴别器的实时切换。对BOC(15, 2.5)和BOC(14, 2)信号的仿真结果表明，该算法能够实现无模糊跟踪，且6 dB衰减多径误差包络面积比传统QStrobe算法分别改善了57%和51%。
The traditional multipath mitigation algorithms for high-order BOC (binary offset carrier) signals have a narrow effective convergence region, which is a weakness for stably tracking, therefore, a multi-region discriminator for multipath mitigation of high-order BOC signals was proposed. The optimized QStrobe discriminator was applied when code error was in the near zero region, which improved the multipath mitigation performance, while the QBOC discriminator was applied in the other regions which had an excellent convergence performance. The Kalman filter was utilized to estimate the tracking error with open-loop method for real-time switch of discriminator. Simulation Results of BOC(15, 2.5) and BOC(14, 2) signals show that the multi-region discriminator algorithm can eliminate the tracking ambiguity. In addition, compared with the traditional QStrobe algorithm, the 6 dB attenuated multipath error envelope area is improved by 51% and 57% respectively.