空中微动旋转目标的二维ISAR成像算法

2D ISAR Imaging Algorithm for Air Micro-Motion Targets

针对具有高速旋转部件的空中微动目标ISAR回波,本文提出一种基于低调频率匹配滤波的刚体与高速旋转部件回波分离方法.同时针对高速旋转部件的回波特点,提出基于逆-Radon变换的成像算法估计高速旋转散射点图像.最终同时得到微动目标刚体以及旋转部件的聚焦良好的ISAR图像.仿真和实测数据处理结果证明了所提算法的有效性.

For ISAR echoes of air micro-motion targets with high-speed rotating parts,this paper presents a low chirp rate matching based algorithm to separate the echoes of rigid body from that of the rotating parts.Meanwhile,an inverse Radon transform based algorithm is proposed to estimate the image of rotating scatters,according to the characteristics of micro-Doppler signals.Therefore,well-focused ISAR imaging for both the rotating parts and the rigid body can be obtained.Finally,the results of simulated and measured data have proved the validity of the proposed algorithm.