张亮 , 王国宏 , 张翔宇 , 等 . 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 . DOI: 10.3969/j.issn.1000-1093.2020.09.015 http://doi.org/10.3969/j.issn.1000-1093.2020.09.015 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。

ZHANG L , WANG G H , ZHANG X Y , et al . Smeared spectrum jamming suppression algorithm based on multiple orders 2D-FRFT [J ] . Acta Armamentarii , 2020 , 41 ( 9 ): 1826 - 1836 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2020.09.015 http://doi.org/10.3969/j.issn.1000-1093.2020.09.015 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.

张亮 , 王国宏 , 孙殿星 , 等 . 基于回波预处理和相参积累的C&I干扰抑制算法 [J ] . 系统工程与电子技术 , 2021 , 43 ( 10 ): 2869 - 2875 . DOI: 10.12305/j.issn.1001-506X.2021.10.21 http://doi.org/10.12305/j.issn.1001-506X.2021.10.21 C&I(chopping and interleaving)干扰是一种针对线性调频(linear frequency modulation, LFM)雷达的典型干扰样式, 干扰子信号调频斜率与雷达发射信号相同, 利用信号处理工具分离真实回波与干扰信号难度较大。针对该问题, 以LFM相参雷达抗自卫式C&I干扰为背景, 提出基于回波预处理和相参积累的干扰抑制算法。根据估计的回波时延, 设置距离窗截取受干扰回波段, 在此基础上, 通过对回波预处理, 改变不同重复周期内假目标的快时间位置分布, 通过相参积累实现干扰抑制。仿真试验表明, 所提算法能够有效抑制强干扰背景下的C&I干扰, 干扰抑制后真实目标检测概率大幅提高, 虚假目标数量明显减少。

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方文 , 全英汇 , 沙明辉 , 等 . 捷变频联合波形熵的密集假目标干扰抑制算法 [J ] . 系统工程与电子技术 , 2021 , 43 ( 6 ): 1506 - 1514 . DOI: 10.12305/j.issn.1001-506X.2021.06.07 http://doi.org/10.12305/j.issn.1001-506X.2021.06.07 密集假目标干扰具备欺骗性和压制性的双重特性, 严重影响雷达作战效能。对此, 提出一种捷变频联合波形熵的密集假目标干扰抑制算法。首先采用Kittler算法进行二值化处理；其次利用波形熵识别目标和干扰；然后采用局部离群因子检测算法对目标回波中叠加有较强干扰旁瓣的数据进行剔除; 最后采用稀疏重构算法进行脉间相参处理。数字仿真实验和外场实测数据处理结果验证了所提算法的有效性。算法性能分析结果表明, 当干信比为58 dB时, 所提算法仍能有效抑制干扰, 正确检测目标。

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