逆合成孔径雷达成像算法的研究与仿真  

Research and simulation of inverse synthetic aperture radar imaging algorithm

作　　者：俞传龙 YU Chuanlong(CAAC East China Regional Administration,Shanghai 200335,China)

机构地区：[1]中国民用航空华东地区空中交通管理局,上海200335

出　　处：《电子设计工程》2020年第23期183-187,共5页Electronic Design Engineering

基　　金：国家自然科学基金委员会与中国民用航空局联合基金(U1511328)。

摘　　要：针对超高分辨率逆合成孔径雷达(ISAR)平台中距离抖动(RCM)影响成像效果的问题,文中对ISAR成像算法进行了研究。通过分析RCM的产生原因,将其划分为线性RCM和二次RCM,使用Keystone变换消除线性RCM的影响,使用时域线条技术(TCS)消除二次RCM的影响。雷达信号在校正RCM后引入距离像熵进行有效转动速度(ERV)估计,从而可以得到最终的成像结果。为了评估算法性能,文中使用Ka波段10 GHz带宽的ISAR平台进行算法的仿真验证,在传统的ISAR成像算法中,熵值、对比度和锐化度3个指标分别为15.1、2.5、12.6。而在文中所提出的成像方法下,这3个指标分别是15.0、2.6和15.0,表明这3个关键指标均有一定程度的提升。Aiming at the problem that the range jitter(RCM)affects the imaging effect in the ultra⁃high resolution Inverse Synthetic Aperture Radar(ISAR)platform,this paper studies the ISAR imaging algorithm.By analyzing the causes of the RCM,it is divided into linear RCM and secondary RCM.The keystone transform is used to eliminate the influence of linear RCM,and the time domain line technology(TCS)is used to eliminate the influence of secondary RCM.The radar signal is After RCM correction,the Effective Rotation Velocity(ERV)can be estimated by introducing the range image entropy,and the final imaging results can be obtained.In order to evaluate the performance of the algorithm,a Ka band 10 GHz ISAR platform is used to simulate and verify the algorithm.In the traditional ISAR imaging algorithm,entropy,contrast and sharpness are 15.1,2.5 and 12.6 respectively,while in the proposed imaging method,the three indexes are 15.0,2.6 and 15.0 respectively,which shows that the three key indexes are improved to a certain extent.

关 键 词：逆合成孔径雷达 KEYSTONE 雷达成像 距离抖动 

分 类 号：TN249[电子电信—物理电子学]