基于PCO+FFT的B1C导航信号捕获算法

为了对采用BOC调制的B1C导航信号进行捕获，提出了基于PCO+FFT的导航信号捕获算法。首先，在深入分析B1C信号特点的基础上，对分段长度和FFT点数进行选择；其次，从相干积分增益、非相关积分增益、多普勒测频范围与测频分辨率、检测概率等几个方面对该算法进行了深入地推导；再次，给出基于新算法的FPGA实现方案；最后，通过仿真验证算法的有效性。在FPGA硬件平台上进行实测的结果显示了方案的正确性。将副载波剥离的方式以及基于状态机的控制核心的实现思路可为导航信号捕获算法的改进提供参考。

B1C navigation signal acquisition algorithm based on PCO+FFT

In order to capture the B1C navigation signal with BOC modulation, a specific acquisition scheme of PCO+FFT was proposed. Firstly, based on in-depth analysis of the characteristics of B1C signal, the segment length and FFT points were selected. Secondly, the algorithm was derived from coherent integral gain, uncorrelated integral gain, Doppler frequency measurement range and resolution, and detection probability. Thirdly, the FPGA implementation scheme based on the algorithm was given. Finally, the simulation performance of the algorithm was given to illustrate the effectiveness of the algorithm. The correctness of the implementation scheme is verified by the actual measurement on the FPGA hardware platform. The method of sub carrier separation and the realization of control core based on state machine have certain reference value for the improvement of navigation signal acquisition algorithm.