一种基于相干叠加的复合载波导航信号捕获方法

针对复合载波导航信号多载波结构特征，基于检测性能、运算复杂度、硬件资源占用情况三方面的综合考虑，提出了一套适用于该信号的捕获架构和处理方法。该架构采用PMF-FFT算法对复合载波各子载波进行分别或统一处理，然后利用各子载波频点间隔信息，对信号进行循环移位并相干叠加，以充分利用信号能量进行检测判决。理论分析和仿真实验表明，与传统的卫星导航信号单载波捕获架构相比，该架构在有限的硬件资源和计算能力的情况下获得了较好的检测性能。

An Acquisition Method for Navigation Signal with Complex Carrier Modulation Based on Coherent Superposition

In this paper, aiming at the multi-carrier structure characteristics of NSCC (Navigation Signal based on Compound Carrier), an acquisition framework and the related processing method are proposed, by sufficiently considering three aspects, namely the detector performance, the computational complexity and the hardware resource occupancy. Besides, the PMF-FFT algorithm is adopt to the framework to process the sub-carrier respectively or uniformly, then the sub-carriers frequency interval information is utilized to process the signal by use of cyclic shift and coherent superposition to make full use of the signal power for detection. Both theory analysis and simulation result illustrate that this framework has desirable detection performance within the restricted hardware resources and computational ability in comparison with the traditional acquisition framework.