基于匹配傅里叶变换的匀加速旋转目标成像  

ISAR imaging of equably accelerative rotating targets based on matching Fourier transform

作　　者：黄雅静[1] 曹敏[1] 付耀文[1] 李亚楠[1] 姜卫东[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《信号处理》2009年第6期864-867,共4页Journal of Signal Processing

摘　　要：机动目标存在非匀速转动甚至是三维转动,其多普勒曲线相对复杂,经典的距离-多普勒(RD)ISAR成像算法性能急剧下降。针对匀加速旋转目标,本文提出了一种基于离散匹配傅里叶变换(DMFT)的成像方法。该方法利用了匀加速旋转目标的回波特点,直接完成横向聚焦,而无需对调频斜率不同的各散射点回波逐个补偿。仿真试验证明了该方法的有效性。Maneuvering targets have nonuniform rotation and even three-dimensional rotation. The Doppler curves are respectively more complex, so the performance of traditional Range-Doppler （RD） ISAR imaging method went down rapidly. Aiming at the equably accelerative rotating targets, a new imaging algorithm based on discrete matching Fourier transform （DMFT） is presented in this pa- per. The algorithm making use of the characteristic of the echo of equably accelerative rotating targets achieves cross-range focusing di- rectly, and need not to compensate the frequency modulation signal with different slopes. Computer simulation illuminated the validity of this algorithm.

关 键 词：匹配傅里叶 ISAR 匀加速旋转 

分 类 号：TN958[电子电信—信号与信息处理]