解线频调步进频率ISAR成像研究  

Study on dechirp SF ISAR imaging

作　　者：刘亚波[1] 李军[1] 李亚超[1] 邢孟道[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2010年第3期469-475,519,共8页Journal of Xidian University

基　　金：重点实验室基金资助项目(9140C0102100902);博士点基金资助项目(20090203120013);西安电子科技大学基本科研业务费资助项目(空时稀缺ISAR成像方法研究)

摘　　要：提出一种采用两次相干化处理实现对解线频调步进频率的逆合成孔径雷达(ISAR)成像算法.首先对回波进行相干化预处理,以估计运动目标的参数,并对相干化后的回波进行补偿;之后,采用相位相干化技术对残留相位误差进行校正,并利用时域带宽拼接技术获得目标的高分辨一维距离像.最后利用传统方位成像算法获得目标的高分辨ISAR图像.仿真数据验证了该方法的有效性.A new high-resolution ISAR imaging method including two coherency processing steps is presented for the linearly stepped-frequency （SF） modulated radar using the dechirp technique. First, the coherency preprocessing is applied to the echoes to estimate the target radial velocity and acceleration rate, and then these motion parameters are compensated. Second, a band coherence technique is used to adjust the residual phase error, and a high resolution range profile can be obtained by means of a time domain band append technique. Finally, a well-focused ISAR image is obtained via the conventional ISAR imaging algorithm. Simulation results verify the effectiveness of the proposed method.

关 键 词：逆合成孔径雷达(ISAR) 线性调频步进雷达 解线频调处理 相干化处理 

分 类 号：TN958.2[电子电信—信号与信息处理]