摘要
针对线性调频(LFM)相参雷达抗自卫式欺骗干扰问题,提出2种利用回波时频相关差异的雷达欺骗干扰识别方法——经典时频相关移频干扰识别方法和尺度时频相关移频干扰识别方法。经典时频相关法首先对回波进行脉压相参积累,同时对回波进行去斜相参积累,最后根据目标峰值差异识别真假目标;尺度时频相关法首先同样对回波进行脉压相参积累,同时计算回波二维简明分数阶傅里叶变换(2D-CFRFT),以解决经典时频相关法中回波加窗问题,最后同样根据目标峰值差异识别真假目标。试验结果表明:当干信比大于0 dB、干扰移频量大于雷达带宽15%时,经典时频相关法和尺度时频相关法干扰识别准确率均接近100%;相比中心频率测量法和调频斜率捷变法,经典时频相关法真实目标识别准确率接近100%的临界信噪比分别降低了8 dB和4 dB,尺度时频相关法分别降低了4 dB和2 dB。
Two methods for identifying frequency-shift jamming,i.e.,a classical time-frequency correlation identification method and a scale time-frequency correlation identification method,are proposed to solve the problem of self-screening deception jamming in linear frequency modulation(LFM)coherent radar.For the classical time-frequency correlation method,pulse compression and coherent integration is performed for the echo,and meanwhile echo signal is processed by stretch process and coherent integration.Finally,the true and false targets are identified according to the difference of target peak values.For the scale time-frequency correlation method,pulse compression and coherent integration is also performed for the echo,and two-dimensional concise fractional Fourier transform(2D-CFRFT)of echo signal is calculated to solve the problem of echo window addition in the classical time-frequency correlation method.Finally,the true and false targets are also identified according to the difference of target peak values.Experimental results show that when the ratio of jamming to signal is greater than 0 dB and the jamming frequency-shift value is greater than 15%of the radar bandwidth,the jamming recognition accuracy of both the proposed methods is close to 100%.Compared with the center-frequency-measurement method and the frequency-modulation-slope-agility method,the classical time-frequency correlation method reduces the critical SNR for real target recognition accuracy close to 100%by 8 dB and 4 dB,respectively,and the scale time-frequency correlation method reduces that by 4 dB and 2 dB,respectively.
作者
张亮
王国宏
杨志国
张翔宇
李思文
ZHANG Liang;WANG Guohong;YANG Zhiguo;ZHANG Xiangyu;LI Siwen(Institute of Information Fusion,Naval Aviation University,Yantai,Shandong 264001,China;Unit 94326 of PLA,Jinan 250000,China;Air Force Staff,Beijing 100032,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2021年第2期136-142,共7页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(61731023,61701519)
“泰山学者”攀登计划专项资金资助项目。
关键词
雷达
欺骗干扰
干扰识别
去斜处理
分数阶傅里叶变换
radar
deception jamming
jamming identification
stretch process
fractional Fourier transform
