Coherent Jamming is one of the Important trends in modern radar electronic warfare. High-speed sampling of wldeband radio frequency (RF) signals and high isolatlon of two receive-transmit antennas are key technologi...Coherent Jamming is one of the Important trends in modern radar electronic warfare. High-speed sampling of wldeband radio frequency (RF) signals and high isolatlon of two receive-transmit antennas are key technologies for the realization of coherent jamming. However, these technologies present significant challenges to enginserlng application. In this paper, a novel repeater Jamming based on interrupted sampling technique is presented. For a Jammer with a receive-transmit time-sharing antenna, a radar signal is sampled with a low rate by the jammer. Then, a train of false targets will be achieved after the Jamming signal feed the matched flltar of a pulse compression radar. For the case of the Ilnser frequency modulated (LFM) pulse compression radars, mathematic principles of the interrupted.sampiing repeater jamming Is developed, and then the efficiency of the jamming is described and stated as expressions of key parameters which are also beneficial to the Jamming design for other coherent radars.展开更多
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
干扰识别已成为认知雷达重要组成部分,针对数字射频存储(Digital Radio Frequency Memory,DRFM)干扰机的间歇采样转发干扰识别问题,提出一种基于小波系数相关性的识别算法。利用小波高频系数在时域上具有高分辨率的特点,首先对干扰信号...干扰识别已成为认知雷达重要组成部分,针对数字射频存储(Digital Radio Frequency Memory,DRFM)干扰机的间歇采样转发干扰识别问题,提出一种基于小波系数相关性的识别算法。利用小波高频系数在时域上具有高分辨率的特点,首先对干扰信号进行小波分解,其次根据间歇采样原理和规律,对小波系数序列进行移位相关计算,最后将相关系数作为特征量进行分类识别。构建不同参数的信号样本对算法的识别准确率进行仿真,仿真结果表明,在信噪比(Signal-to-Noise Ratio,SNR)较高(SNR>0 dB)时,识别准确率近似为100%,在低信噪比处(SNR=-10 dB)仍有不小于80%的正确率,同时叠加回波后也可以有效识别干扰,因此证明了算法的有效性,具有一定工程实用价值。展开更多
针对步进线性调频信号(stepped frequency-linear frequency modulation,SF-LFM)体制雷达对抗问题,提出了一种基于子脉冲间歇采样的干扰方法。通过对截获SF-LFM信号的子脉冲进行交替采样与转发,在雷达成像处理后可形成沿距离向延拓的逼...针对步进线性调频信号(stepped frequency-linear frequency modulation,SF-LFM)体制雷达对抗问题,提出了一种基于子脉冲间歇采样的干扰方法。通过对截获SF-LFM信号的子脉冲进行交替采样与转发,在雷达成像处理后可形成沿距离向延拓的逼真假目标。在此基础上对其干扰特性与参数设计问题进行了讨论,并分别通过一维理想散射点仿真与某型飞机二维成像数据仿真实验验证了所提方法有效性。展开更多
文摘Coherent Jamming is one of the Important trends in modern radar electronic warfare. High-speed sampling of wldeband radio frequency (RF) signals and high isolatlon of two receive-transmit antennas are key technologies for the realization of coherent jamming. However, these technologies present significant challenges to enginserlng application. In this paper, a novel repeater Jamming based on interrupted sampling technique is presented. For a Jammer with a receive-transmit time-sharing antenna, a radar signal is sampled with a low rate by the jammer. Then, a train of false targets will be achieved after the Jamming signal feed the matched flltar of a pulse compression radar. For the case of the Ilnser frequency modulated (LFM) pulse compression radars, mathematic principles of the interrupted.sampiing repeater jamming Is developed, and then the efficiency of the jamming is described and stated as expressions of key parameters which are also beneficial to the Jamming design for other coherent radars.
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.
文摘干扰识别已成为认知雷达重要组成部分,针对数字射频存储(Digital Radio Frequency Memory,DRFM)干扰机的间歇采样转发干扰识别问题,提出一种基于小波系数相关性的识别算法。利用小波高频系数在时域上具有高分辨率的特点,首先对干扰信号进行小波分解,其次根据间歇采样原理和规律,对小波系数序列进行移位相关计算,最后将相关系数作为特征量进行分类识别。构建不同参数的信号样本对算法的识别准确率进行仿真,仿真结果表明,在信噪比(Signal-to-Noise Ratio,SNR)较高(SNR>0 dB)时,识别准确率近似为100%,在低信噪比处(SNR=-10 dB)仍有不小于80%的正确率,同时叠加回波后也可以有效识别干扰,因此证明了算法的有效性,具有一定工程实用价值。
文摘针对步进线性调频信号(stepped frequency-linear frequency modulation,SF-LFM)体制雷达对抗问题,提出了一种基于子脉冲间歇采样的干扰方法。通过对截获SF-LFM信号的子脉冲进行交替采样与转发,在雷达成像处理后可形成沿距离向延拓的逼真假目标。在此基础上对其干扰特性与参数设计问题进行了讨论,并分别通过一维理想散射点仿真与某型飞机二维成像数据仿真实验验证了所提方法有效性。