基于RWT的旋转微动目标二维ISAR成像算法

摘要

本文针对旋转微动目标的二维ISAR成像问题,首先,分析了目标旋转微动及刚体部件在距离-慢时间域的回波特性;其次,提出了基于解正弦调频RWT的旋转微动部件成像算法,同时,提取旋转微动散射点的位置参数并滤除其回波,对剩余回波采用基于RWT方法进行刚体回波重建,并利用传统RD算法获得刚体ISAR像;最后,仿真结果证明了本文算法的有效性.%To resolve the problem of 2D ISAR imaging of rotating micro-motion targets, firstly, this paper analysis the range-slow-time echo characteristics of rotating micro-motion and rigid parts. The Sine-Demodulation RWT based imaging algorithm for rotating micro-motion parts is proposed. The position parameters of rotating micro-motion scatters are estimated and their echoes are removed. The remained echoes, based on RWT, are used to reconstruct the rigid signals and ISAR imaging for rigid parts is performed by RD algorithm. Finally, simulation results have proved the validity of the proposed algorithm.