基于分布式压缩感知的高分宽幅SAR动目标成像技术  

High-resolution Wide-swath SAR Moving Target Imaging Technology Based on Distributed Compressed Sensing

作　　者：潘洁 王帅 李道京 卢晓春[4] PAN Jie;WANG Shuai;LI Daojing;LU Xiaochun(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;National Key Lab of Microwave Imaging Technology,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;National Time Service Center,Chinese Academy of Sciences,Xian 710600,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]微波成像技术重点实验室,北京100190 [3]中国科学院大学,北京100049 [4]中国科学院国家授时中心,西安710600

出　　处：《雷达学报（中英文）》2020年第1期166-173,共8页Journal of Radars

基　　金：国家高分重大专项共性关键技术(30-H30C01-9004-19/21)~~

摘　　要：高分宽幅SAR动目标成像对目标跟踪具有重要的意义,常规天基多通道SAR技术要实现高分宽幅动目标成像需要通道数量巨大,系统复杂度过高,而且图像在方位向存在成对回波,形成虚警。针对上述问题,该文提出了一种基于分布式压缩感知的高分宽幅SAR动目标成像技术,在通道数量较大时,通道数量相比常规高分宽幅动目标成像构型通道数量约降低1倍,利用动目标稀疏特性和杂波背景非稀疏特性构建分布式压缩感知观测模型,采用先方位1维分布式压缩感知重建再距离方位2维分布式压缩感知重建,实现杂波背景和稀疏动目标的重建,并抑制多通道SAR动目标成像中的成对回波。结合RADAR-SAT数据的仿真试验结果验证了该技术的有效性。High-resolution wide-swath SAR moving target imaging is of great significance for target tracking.To achieve target tracking,conversional space-based multichannel SAR technology requires a large number of channels.However,this leads to high system complexity.Moreover,paired false target echoes exist in the azimuth.To address such problems,a high-resolution wide-swath SAR moving target imaging technology based on distributed compressed sensing is proposed in this paper.When the number of channels is large enough,the number of channels is approximately half of that of the conventional high-resolution wide-swath target imaging configuration channel.A distributed compressed sensing observation model is constructed using the sparse property of moving targets and the nonsparse characteristics of the clutter background.Clutter background and sparse moving targets are reconstructed by combining one-dimensional distributed compressed sensing reconstruction in the azimuth and two-dimensional distributed compressed sensing reconstruction in the range-azimuth.Moreover,the paired false target echoes in multichannel SAR moving target are suppressed.The simulation results combined with RADAR-SAT data verify the effectiveness of the proposed technology.

关 键 词：合成孔径雷达 多通道 高分辨率宽测绘带 分布式压缩感知 运动目标显示 

分 类 号：TN951[电子电信—信号与信息处理]