高速运动目标的ISAR成像方法  

ISAR Imaging of High Speed Moving Targets

作　　者：张焕颖[1] 张守宏[1] 李强[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,西安710071

出　　处：《电子与信息学报》2007年第8期1789-1793,共5页Journal of Electronics & Information Technology

基　　金：国家部级基金(51407020104DZ0127)资助课题

摘　　要：针对高速目标的ISAR成像问题,该文提出基于"运动"参考解调频的运动补偿方法。该算法利用由雷达辅助测距信号测得的参考距离和对目标距离像包络对齐的结果拟合出目标运动轨迹,对回波进行以拟合轨迹为参考距离的解调频处理,完成回波的脉冲内速度补偿和相干化,最后通过Keystone变换消除目标的转动分量引起的越距离单元走动。给出了应用该方法的具体步骤,通过仿真实验证明该算法的有效性。A novel method for high speed moving tar-gets ISAR imaging based on ＇moving＇ reference dechirp signal is presented in this paper, Firstly target track fitting is accomplished by utilizing assistant low-resolution range measurement results and envelope alignment for the target high-resolution range profiles, Then the target track is used for dechirp processing as a ＇moving ＇ reference to accomplish motion compensation within a pulse period and coherent processing. Finally, Keystone transform is applied to correct the Migration Through Resolution Cells （MTRC） due to target rotation. Steps of this method for high speed moving targets are detailed, Simulations show the effectiveness of the new method.

关 键 词：ISAR成像 运动补偿 运动参数估计 高速运动目标 相干 

分 类 号：TN957.52[电子电信—信号与信息处理]