摘要
多发多收合成孔径雷达(MIMO-SAR)是近年来提出并备受关注的一种新型雷达成像模式,通过多天线同时发射、多天线同时接收的工作方式能够获得远多于实际天线数目的等效观测通道,为解决常规SAR面临的方位向高分辨率与宽测绘带指标相互矛盾、弱小慢速运动目标难以检测等难题提供了更为有效的技术途径。该文围绕MIMO-SAR成像技术及其应用展开论述,从距离分辨率增强、3维下视成像、高分辨率宽测绘带成像以及动目标检测等方面综述了MIMO-SAR的研究状况,分析了系统的体制优势和不足,进而归纳了MIMO-SAR研究中的若干关键技术问题,最后对其应用前景进行了展望。
Recently, a novel conception of Synthetic Aperture Radar （SAR） based on Multi-Input Multi-Output （MIMO） technology draws much attention for its potential advantages. MIMO-SAR could obtain much more equivalent channels than the number of the physical array elements by simultaneously utilizing multiple antennas at transmission and reception. These additional channels are demonstrated to be useful for the application of High-Resolution Wide-Swath （HRWS） imaging and slowly moving target indication. In this paper, a detailed discussion on the conception and connotation of MIMO-SAR is made firstly, and then the investigation states of MIMO-SAR, such as high range resolution SAR imaging, three-dimensional down-looking SAR imaging, HRWS imaging and Ground Moving Target Indication （GMTI）, are discussed. Base on the discussion mentioned above, the advantages and disadvantages of MIMO-SAR system are analyzed, and the key technical issues in MIMO-SAR are summarized. At last, the prospects of MIMO-SAR application are pointed out.
出处
《雷达学报（中英文）》
CSCD
2014年第1期10-18,共9页
Journal of Radars
基金
国家杰出青年基金(61025006)资助课题
