并行码相位结合分形重构的TMBOC调制信号捕获算法

Acquisition Algorithm Combining Parallel Code Phase with Fractal-Reconstruction of TMBOC Modulation Signal

针对TMBOC调制信号自相关函数多峰值造成的捕获模糊性问题,提出了一种并行码相位结合分形重构去除模糊性的捕获算法.该算法首先对接收信号解调,然后用本地PN和BOC码分别与解调后的信号循环相关,对相关结果取模相加,最后利用分形重构算法折叠出没有副峰的相关函数.理论分析和仿真结果表明,重构算法能有效捕获到信号,算法复杂度较低,而且相关峰值比ASPeCT算法提高了43.7%,经过两径信道时主峰能量达到96%.

Aimed at the ambiguity in acquisition of the TMBOC modulation signal caused by the multipeaks of auto-correlation function,this paper proposed an acquisition algorithm combining parallel code phase with fractal-reconstruction to remove ambiguity.The algorithm demodulates the received signal,and uses local PN code and BOC code to correlate with demodulated signal.Next,it takes the absolute value of the results and addition.Finally,it utilizes the fractal-reconstruction algorithm to fold a new correlation function without sub-peaks.Theoretical analysis and simulation results show that the algorithm can capture the signal effectively with low complexity.Moreover,its correlation peak increases by 43.7% compared to the ASPeCT algorithm,and its main peak power reaches 96%through two-path channel.