基于多阶次二维分数阶傅里叶变换的频谱弥散干扰抑制算法

doi:10.3969/j.issn.1000-1093.2020.09.015

摘要/Abstract

摘要： 现有频谱弥散（SMSP）干扰抑制算法均针对一个脉冲重复周期回波信号，涉及相干处理间隔（CPI）整体回波时，需要分别对每个重复周期内的SMSP进行抑制。针对该问题，以远距离支援干扰条件下线性调频脉冲多普勒雷达抗SMSP为背景，以雷达在真实目标方位接收到的一个CPI回波为处理对象，提出基于多阶次二维分数阶傅里叶变换的SMSP抑制算法。分析回波信号多阶次分数阶特征，结合采样型离散分数阶傅里叶变换快速算法，研究真实目标和干扰机发生分数阶域走动的临界运动参数，设计二维遮盖窗。仿真结果表明，所提算法无需分别对每个重复周期内的SMSP进行抑制，通过对一个CPI回波整体处理，可同时达成干扰抑制和目标检测的目的。

关键词: 脉冲多普勒雷达, 频谱弥散干扰, 干扰抑制, 二维分数阶傅里叶变换

Abstract: The existing smeared spectrum (SMSP) jamming suppression algorithms are all aimed at the echo signal within a pulse repetition interval (PRI). Those algorithms need to suppress the SMSP jamming of each PRI when dealing with the whole echo within a coherent processing interval (CPI). For linear frequency modulation pulse Doppler radar countering stand-off SMSP jamming, a jamming suppression algorithm based on multiple orders two-dimensional fractional Fourier transform(2D-FRFT) is proposed to process the echo within a CPI received by radar. The fractional characteristics of the jammed echo are analyzed. On this basis，the critical motion parameters of real target and jammer in the appearance of fractional migration are studied using the sampling-type DFRFT. The 2D fractional coverage windows are designed to remove the SMSP jamming. The simulated results show that the proposed algorithm can be used to simultaneously achieve the jamming suppression and target detection by processing a CPI echo without suppressing the SMSP jamming of each PRI.

Key words: pulseDopplerradar, smearedspectrumjamming, jammingsuppression, two-dimensionalfractionalFouriertransform

中图分类号:

张亮，王国宏，张翔宇，李思文. 基于多阶次二维分数阶傅里叶变换的频谱弥散干扰抑制算法[J]. 兵工学报, 2020, 41(9): 1826-1836.

ZHANG Liang， WANG Guohong， ZHANG Xiangyu， LI Siwen. Smeared Spectrum Jamming Suppression Algorithm Based on Multiple Orders 2D-FRFT[J]. Acta Armamentarii, 2020, 41(9): 1826-1836.

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