基于散射点信号特性的ISAR成像时间选择算法  

An Algorithm for Selecting ISAR Imaging Intervals Based on the Scatter-Signal Property

作　　者：韩兴斌[1] 胡卫东[1] 郁文贤[1] 

机构地区：[1]国防科技大学ATR重点实验室,长沙410073

出　　处：《信号处理》2007年第5期704-709,共6页Journal of Signal Processing

摘　　要：在舰船目标ISAR成像中,在有些相关成像时间内,海浪的作用会使得舰船目标具有俯仰、偏航和滚动的三维转动,目标的ISAR像变得模糊。为获得聚焦的ISAR像,需要合理地选择成像时间,使得在相关成像时间内,目标仅具有二维转动。本文提出了一种成像时间选择的算法,该算法利用离散调频傅立叶变换估计散射点信号的参数,并根据二维和三维转动引起目标散射点信号特性的不同,推断目标的运动状态,选择成像时间。算法中有效利用了多个散射点的信息,但不要求跟踪目标特定位置上的散射点。文中还分析了算法估计的性能,并通过仿真试验证实了该算法的有效性。When an inverse synthetic radar （ISAR） imaging the ship,in some intervals the ship synchronously has three-dimen- sional rotations with pitch,roll and yaw because of the effect of sea waves,and the ship ISAR images become defocused. In order to obtain focused ISAR images,we may select the appropriate imaging intervals,during which the target rotation is two dimensional. In this paper an algorithm for selecting imaging intervals is proposed. In the algorithm, after estimating the parameters of some scatter signals through discrete chirp-Fourier transform （DCFF） ,we detect three-dimensional rotation and select imaging intervals based on the scattersignal properties. The algorithm effectively utilizes the information of several scatters, but need not track some scatters on the particular locations of target. The performance of the algorithm is also analyzed,and the results based on the simulation ISAR data demonstrate the effectiveness of the algorithm.

关 键 词：ISAR 三维转动 散焦 时间选择 离散调频傅立叶变换 

分 类 号：TN957.52[电子电信—信号与信息处理]