基于脉内频率编码联合调频斜率捷变波形的ISRJ对抗方法  

Anti-ISRJ Method Based on Intrapulse Frequency-coded Joint Frequency Modulation Slope Agile Radar Waveform

作　　者：王晓戈 李槟槟 陈辉[1] 刘维建[1] 朱永哲 倪萌钰 WANG Xiaoge;LI Binbin;CHEN Hui;LIU Weijian;ZHU Yongzhe;NI Mengyu(Air Force Early Warning Academy,Wuhan 430019,China;The People’s Liberation Army Unit 93209,Beijing 100094,China)

机构地区：[1]空军预警学院,武汉430019 [2]中国人民解放军93209部队,北京100094

出　　处：《雷达学报（中英文）》2024年第5期1019-1036,共18页Journal of Radars

基　　金：国家自然科学基金(62001510,62101593)。

摘　　要：间歇采样转发干扰(ISRJ)是一种脉内相参干扰,能在目标斜距前后形成多个逼真假目标来严重影响雷达检测,是当前电子反对抗的热点之一。针对这一问题,该文提出了一种基于脉内频率编码联合调频斜率捷变波形的抗ISRJ方法。首先,雷达发射脉内频率编码联合调频斜率捷变信号,通过子脉冲中心频率、调频斜率捷变提高子脉冲间相互掩护能力。之后依据发射信号子脉冲斜率变化时序将回波信号划分为多个切片。然后利用模糊C均值(FCM)算法对回波切片进行干扰识别。最后在分数阶域和时域对回波信号进行级联滤波。仿真结果表明,FCM方法在信噪比(SNR)大于-2.5 dB和干信比(JSR)大于5 dB时,能100%识别干扰机同步采样场景下回波中的受干扰回波切片。在较高JSR和低SNR下,所提方法能有效减少目标能量损失并抑制剩余干扰产生的距离旁瓣。在JSR为50 dB时,干扰抑制后的目标检测概率可达90%以上。Interrupted Sampling Repeater Jamming(ISRJ)is a type of intrapulse coherent jamming that can form multiple realistic false targets that lead or lag behind the actual target,severely affecting radar detection.It is one of the hotspots of current research on electronic counter-countermeasures.To address this problem,an anti-ISRJ method based on an intrapulse frequency-coded joint Frequency Modulation(FM)slope agile waveform is proposed in this paper.In this method,the radar first transmits an intrapulse frequency-coded joint FM slope agile signal to improve the mutual coverability of subpulses by manipulating subpulse center frequency and FM slope agility.Next,the echo signal is divided into several slices according to the subpulse timing of the transmitted signal.Then,the Fuzzy C-Means(FCM)algorithm is used to classify the echo slices.Finally,the interference is suppressed via fractional-domain joint time domain filtering.Simulation results show that the FCM-based method can identify 100%of the interfered echo slices in a jammer synchronous sampling scenario when the Signal-to-Noise Ratio(SNR)is greater than−2.5 dB,and the Jamming-to-Signal Ratio(JSR)is greater than 5 dB.For high JSRs and low SNRs,the proposed method can effectively reduce the target energy loss and suppress the range sidelobes generated via residual interference.Moreover,the target detection probability after interference suppression exceeds 90%when JSR=50 dB.

关 键 词：间歇采样转发干扰 频率编码联合调频斜率捷变 分数阶傅里叶变换 时域滤波 电子反对抗 

分 类 号：TN972[电子电信—信号与信息处理]