一种基于双数字信道化储频的SAR干扰方法  

A Method of SAR Jamming Based on Dual-digital Channelized Frequency Storage

作　　者：兰初军 宋志勇[1] 刘宇 LAN Chujun;SONG Zhiyong;LIU Yu(ATR Laboratory,National University of Defense Technology,Changsha Hunan 410073,China)

机构地区：[1]国防科技大学ATR国防重点实验室,湖南长沙410073

出　　处：《现代雷达》2025年第2期31-36,共6页Modern Radar

基　　金：国家创新研究群体科学基金资助项目(61921001)。

摘　　要：为提高目标截获概率,雷达干扰机通常通过增加多个接收通道来拓宽其工作带宽,以减少频率扫描时间,从而达到快速搜索目标的目的,但这同时也带来了由于捕获的目标存在跨越多个通道,导致侦测到目标信息不全而影响干扰效能的问题。文中提出了一种跨通道处理的双数字信道化储频结构,以实现跨通道信道化接收和信道化发射。首先,针对合成孔径雷达(SAR)侦察,采用时频分析方法估计SAR雷达脉内参数,同时结合通道内与通道间的脉冲描述字完成SAR雷达数据融合与识别;然后,针对SAR干扰,采用距离向、方位向联合调制的“脉组步进移频+多抽头”方法,以生成复杂的干扰脉冲信号;最后,通过仿真测试验证了在设置不同带宽比例的目标及施加相应的干扰调制条件下,所提方法对SAR雷达形成了有效的干扰覆盖面积。To improve the probability of target interception,the operating bandwidth of radar jammers is usually widen by adding receiving channels to reduce frequency scanning time as well as achieving quickly searching for targets.However,this also brings the problem of incomplete detection information of target due to the presence of captured targets crossing multiple channels,which affects the effectiveness of jamming.A dual-digital channelized frequency storage structure with cross channel processing is proposed in this paper to achieve cross channel channelized receiving and transmission.Firstly,for the synthetic aperture radar(SAR)reconnaissance,time-frequency analysis is used to estimate the intra pulse parameters of SAR,and the SAR data fusion and recognition are completed by combining the pulse description words within and between channels.Then,for the SAR jamming,the‘pulse group step frequency shift and multi-tap’method of joint modulation between the range and azimuth directions is used to generate complex jamming pulse signals.Finally,simulation results show that the proposed method forms an effective area of jamming for SAR under different bandwidth ratios of targets and corresponding jamming modulation conditions.

关 键 词：合成孔径雷达 数字射频存储器 信道化 数据融合 干扰调制 

分 类 号：TN97[电子电信—信号与信息处理]