一种基于全相位预处理的PMF-FFT改进算法  

An Improved PMF-FFT Algorithm Based on All Phase Preprocessing

作　　者：王云静 张晓林[1] 郑昆 Wang Yunjing;Zhang Xiaolin;Zheng Kun(School of Electronic and Information Engineering, Beihang University, Beijing 100191, China)

机构地区：[1]北京航空航天大学,北京100191

出　　处：《遥测遥控》2018年第3期15-20,共6页Journal of Telemetry,Tracking and Command

基　　金：西安爱生技术集团公司创新发展基金(ASN-IF2015-1405)

摘　　要：高动态条件下扩频信号的捕获常采用基于FFT的部分匹配滤波(PMF-FFT)捕获算法,但此算法存在频谱泄漏和多普勒频偏估计误差大的问题。通过全相位预处理的方法对PMF-FFT算法做出改进,提出了PMF-apFFT/FFT捕获算法。一方面,所提算法能够利用全相位FFT(apFFT)算法抑制PMF-FFT算法存在的频谱泄漏;另一方面,算法利用FFT运算结果辅助PMF-apFFT支路对多普勒频偏估计值进行校正,提高了频率估计精度。理论分析和仿真结果表明,PMF-apFFT/FFT捕获算法能够有效抑制PMF-FFT算法中由FFT运算带来的频谱泄漏,且多普勒频偏估计精度有显著提高。The FFT-based Partially Matched Filter（PMF-FFT） algorithm is commonly used for the spread spectrum signal acquisition under high dynamic conditions, but it has the problems of spectrum leakage and large Doppler frequency error. In this paper we propose a PMF-apFFT/FFT algorithm based on all-phase preprocessing. It can suppress the spectrum leakage through the all-phase FFT（apFFT） algorithm and the FFT operation results help the PMF-apFFT branch to improve the estimation precision of Doppler shift. The theoretical analysis and simulation results show that the PMF-apFFT/FFT algorithm can effectively suppress the spectrum leakage and improve the estimation precision of Doppler shift.

关 键 词：高动态扩频信号 PMF-FFT 全相位FFT 多普勒频移估计 

分 类 号：TN914.42[电子电信—通信与信息系统]