基于实波束扫描的相控阵雷达前视成像  

Forward-looking Imaging Based on Real Beam Scanning Phased Array Radars

作　　者：温晓杨[1] 匡纲要[1] 胡杰民[1] 占荣辉[1] 张军[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《航空学报》2014年第7期1977-1991,共15页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(61002022)~~

摘　　要：实现机载或弹载雷达正前方目标区域高分辨力成像对提高着陆安全性或制导精度有着重要的意义,基于相控阵雷达(PAR)工作原理,建立前视扫描过程中的回波信号模型,对目前广泛研究的解卷积前视成像方法进行了深入分析,指出其未能有效提高方位分辨力的原因,并在此基础上提出了一种基于压缩感知理论的扫描雷达前视成像方法。该方法通过对大时宽带宽积信号的脉冲压缩获得径向高分辨,并基于场景中的强散射中心分布具有稀疏性(可压缩)这一事实,利用压缩感知最优化方法获得高的方位分辨力,仿真结果证明了所提方法的有效性,分析了基于压缩感知前视成像方法的性能。该方法同样适用于机械扫描雷达的前视成像。High resolution imaging under forward-looking condition is of great benefit to airplanes＇ safe landing or seekers＇ guidance with high precision. According to the principle of phased array radar （PAR）, the echo model during the scanning process is established firstly. Using the model, some former methods such as multi-channel deconvolution are analyzed com- prehensively, and the reason why these are ineffective is deduced. After that, a novel forward-looking imaging method based on compressive sensing is proposed for scanning PAR using the fact that dominant scatters are sparse or compressive in an interesting area. In the method, high angle resolution is achieved by the compressive sensing after pulse compression along the slant range which is aimed to obtain high range resolution. Results of simulations proves the effectiveness of the method, and its performance is analyzed. Although the imaging is accomplished using PAR, the method is also effective for mechanical scanning radars.

关 键 词：相控阵雷达 扫描雷达 回波建模 前视成像 压缩感知 

分 类 号：V243.2[航空宇航科学与技术—飞行器设计] TN95[电子电信—信号与信息处理]