The interrupted sampling repeater jamming（ISRJ） is an effective deception jamming method for coherent radar, especially for the wideband linear frequency modulation（LFM） radar. An electronic counter-countermeasure...The interrupted sampling repeater jamming（ISRJ） is an effective deception jamming method for coherent radar, especially for the wideband linear frequency modulation（LFM） radar. An electronic counter-countermeasure（ECCM） scheme is proposed to remove the ISRJ-based false targets from the pulse compression result of the de-chirping radar. Through the time-frequency（TF） analysis of the radar echo signal, it can be found that the TF characteristics of the ISRJ signal are discontinuous in the pulse duration because the ISRJ jammer needs short durations to receive the radar signal. Based on the discontinuous characteristics a particular band-pass filter can be generated by two alternative approaches to retain the true target signal and suppress the ISRJ signal. The simulation results prove the validity of the proposed ECCM scheme for the ISRJ.展开更多
For a netted radar system to counteract the deceptionelectronic countermeasure （ECM） signals, an effective electroniccounter countermeasure （ECCM） approach is proposed. The proposedapproach is realized based on th...For a netted radar system to counteract the deceptionelectronic countermeasure （ECM） signals, an effective electroniccounter countermeasure （ECCM） approach is proposed. The proposedapproach is realized based on the new signaling strategyfor the temporal pulse diversity, which makes use of transmittingpulses at each pulse repetition interval （PRI） with specific transmissionpulse block, and then following proper processing andinformation fusion. The existence of the deceptive ECM signal isconfirmed by one station, while the other stations in the nettedradar with same parameters applied the pulse diversity skillfully.Meanwhile, this method ensured that, pulse diversity can be appliedin netted radar. The performance assessment shows that theproposed solutions are effective in presence of ECM signals. Thisalgorithm has been demonstrated by simulations. The presentedsimulation results are in excellent consensus with theoretical predictions.展开更多
间歇采样转发干扰是一种针对大时宽带宽线性调频(linear frequency modulation,LFM)信号的新型相干干扰样式,通过不同的参数设置可以形成逼真多假目标以及具有压制效果的密集假目标干扰。根据间歇采样转发干扰"存储-转发-存储-转发...间歇采样转发干扰是一种针对大时宽带宽线性调频(linear frequency modulation,LFM)信号的新型相干干扰样式,通过不同的参数设置可以形成逼真多假目标以及具有压制效果的密集假目标干扰。根据间歇采样转发干扰"存储-转发-存储-转发"的干扰特点,给出了能量函数的定义,并根据目标回波信号和干扰信号能量函数的特征差异,提出了一种提取未受干扰影响的目标回波信号数据的方法;然后将其看作目标回波信号的压缩数据,利用其与解线调处理后的目标回波信号稀疏频域之间的线性关系,构建了压缩感知最小问题求解模型;最后,利用正交匹配追踪算法重构了目标回波信号,实现了对间歇采样转发干扰的抑制。蒙特卡罗仿真结果表明:通过设置合适的阈值,所提方法可以获得较好的干扰抑制性能和较高的抗干扰成功概率,并且不仅适用于中带LFM匹配滤波体制雷达,而且适应于宽带LFM去斜体制雷达。展开更多
针对欺骗干扰环境中的线性调频(linear frequency modulation,LFM)雷达干扰抑制问题,提出了一种动态环境下性能较好的数字射频存储器(digital radio frequency memory,DRFM)假目标干扰抑制方法。该方法通过自适应滤波从时-频解耦后的信...针对欺骗干扰环境中的线性调频(linear frequency modulation,LFM)雷达干扰抑制问题,提出了一种动态环境下性能较好的数字射频存储器(digital radio frequency memory,DRFM)假目标干扰抑制方法。该方法通过自适应滤波从时-频解耦后的信号中估计出干扰信号并对干扰信号进行对消,从而恢复出目标回波信号。该方法无需进行干扰环境下的多分量信号参数估计,运算复杂度低。仿真结果表明,在干扰与目标信号之间的时延差大于0.2μs的情况下,对干扰信号的脉压峰值功率抑制可达50 dB以上,而目标信号脉压峰值功率损失小于1 dB,且算法对干信比不敏感。展开更多
基金supported by the National Natural Science Foundation of China(61271442)
文摘The interrupted sampling repeater jamming（ISRJ） is an effective deception jamming method for coherent radar, especially for the wideband linear frequency modulation（LFM） radar. An electronic counter-countermeasure（ECCM） scheme is proposed to remove the ISRJ-based false targets from the pulse compression result of the de-chirping radar. Through the time-frequency（TF） analysis of the radar echo signal, it can be found that the TF characteristics of the ISRJ signal are discontinuous in the pulse duration because the ISRJ jammer needs short durations to receive the radar signal. Based on the discontinuous characteristics a particular band-pass filter can be generated by two alternative approaches to retain the true target signal and suppress the ISRJ signal. The simulation results prove the validity of the proposed ECCM scheme for the ISRJ.
基金supported by the National Defense Pre-Research Foundation of China(9140A07030713DZ02101)
文摘For a netted radar system to counteract the deceptionelectronic countermeasure （ECM） signals, an effective electroniccounter countermeasure （ECCM） approach is proposed. The proposedapproach is realized based on the new signaling strategyfor the temporal pulse diversity, which makes use of transmittingpulses at each pulse repetition interval （PRI） with specific transmissionpulse block, and then following proper processing andinformation fusion. The existence of the deceptive ECM signal isconfirmed by one station, while the other stations in the nettedradar with same parameters applied the pulse diversity skillfully.Meanwhile, this method ensured that, pulse diversity can be appliedin netted radar. The performance assessment shows that theproposed solutions are effective in presence of ECM signals. Thisalgorithm has been demonstrated by simulations. The presentedsimulation results are in excellent consensus with theoretical predictions.
文摘间歇采样转发干扰是一种针对大时宽带宽线性调频(linear frequency modulation,LFM)信号的新型相干干扰样式,通过不同的参数设置可以形成逼真多假目标以及具有压制效果的密集假目标干扰。根据间歇采样转发干扰"存储-转发-存储-转发"的干扰特点,给出了能量函数的定义,并根据目标回波信号和干扰信号能量函数的特征差异,提出了一种提取未受干扰影响的目标回波信号数据的方法;然后将其看作目标回波信号的压缩数据,利用其与解线调处理后的目标回波信号稀疏频域之间的线性关系,构建了压缩感知最小问题求解模型;最后,利用正交匹配追踪算法重构了目标回波信号,实现了对间歇采样转发干扰的抑制。蒙特卡罗仿真结果表明:通过设置合适的阈值,所提方法可以获得较好的干扰抑制性能和较高的抗干扰成功概率,并且不仅适用于中带LFM匹配滤波体制雷达,而且适应于宽带LFM去斜体制雷达。
文摘针对欺骗干扰环境中的线性调频(linear frequency modulation,LFM)雷达干扰抑制问题,提出了一种动态环境下性能较好的数字射频存储器(digital radio frequency memory,DRFM)假目标干扰抑制方法。该方法通过自适应滤波从时-频解耦后的信号中估计出干扰信号并对干扰信号进行对消,从而恢复出目标回波信号。该方法无需进行干扰环境下的多分量信号参数估计,运算复杂度低。仿真结果表明,在干扰与目标信号之间的时延差大于0.2μs的情况下,对干扰信号的脉压峰值功率抑制可达50 dB以上,而目标信号脉压峰值功率损失小于1 dB,且算法对干信比不敏感。
