目标微动对雷达回波的调制效应包括微多普勒调制、高分辨像调制和RCS调制等。根据单频和线性调频信号下典型微动目标的电磁回波模型,分析了微动在单频回波和高分辨距离像上的调制特性,在研究了微动目标的微多普勒时频图以及距离像一时间序列图的调制规律后,提出了基于逆Radon变换重构微动目标二维强散射中心分布的方法,对于微动目标利用回波高分辨距离像序列和时频分布图实现了目标二维重构,通过对仿真实验和暗室测量数据实验验证了该方法的可行性和有效性。
The modulation effect of micro motion on radar echo includes micro-Doppler, modulation of range profiles, and modulation of RCS. After introducing the radar echo models of the target with micro-motions under single frequency and LFM signal, the modulation effect of micro-motion is analyzed in this paper firstly. A 2D scattering distribution reconstruction method for the target with micro-motion based on inverse Radon transform is proposed according to the modulation characteristics of micro-Doppler on time-frequency distribution images and time-range profiles images. The experimental results show the validity and effectiveness of the proposed method.