一种高精度的ISAR转动补偿和方位定标方法  

A High-precision Method of the Rotation Compensation and Cross-range Scaling for ISAR Imaging

作　　者：刘鑫阁 邢孟道[1,2] 孙光才[1,2] LIU Xinge;XING Mengdao;SUN Guangcai(National Laboratory of Radar Signal Processing,Xidian University,Xi＇an 710071,China;Collaborative Innovation Center of Information Sensing and Understand,Xidian University,Xi＇an 710071,China)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071 [2]西安电子科技大学信息感知技术协同创新中心,西安710071

出　　处：《电子与信息学报》2018年第9期2250-2257,共8页Journal of Electronics & Information Technology

基　　金：国家自然科学基金创新群体(61621005)~~

摘　　要：传统逆合成孔径雷达(ISAR)成像算法忽略了目标回波的高阶转动相位的影响,导致方位向聚焦效果较差,且无法直接从目标图像中获取目标尺寸信息。该文提出一种转动补偿和方位定标方法。该方法采用回波的全部方位信息,通过构造局部平均多普勒趋势(LADT)信号获取目标回波的多普勒变化趋势。进一步利用随机采样一致(RANSAC)算法估计多普勒调频率及目标有效转动速度,实现高精度转动补偿与方位定标。仿真与实测数据实验验证了该方法的有效性。Traditional Inverse SAR （ISAR） imaging algorithms neglect the impact of high-order rotational phase in the signal, which may make ISAR images of a target defocused. Further, the size of a target can not be obtained from ISAR image directly. In this study, an effective method to achieve the rotation compensation and cross-range scaling for ISAR imaging is proposed. Firstly, all the signals of the target are used to form the Local Average Doppler Trend （LADT） signal. Subsequently, RANdom SAmple Consensus （RANSAC） algorithm is performed to estimate the Doppler rate and effective rotational velocity. Finally, high-precision rotation compensation and cross-range scaling can be accomplished. Simulation and real data experiments validate the effectiveness of the proposed method.

关 键 词：逆合成孔径雷达 转动补偿 方位定标 多普勒调频率 随机采样一致 

分 类 号：TN958[电子电信—信号与信息处理]