逆合成孔径成像激光雷达微多普勒特征分析

Micro-Doppler feature analysis in inverse synthetic aperture imaging lidar

逆合成孔径成像激光雷达是一种结合将激光信号和逆合成孔径原理相结合的新体制雷达,能实现对运动目标的超高分辨成像,为提取目标的精细微动特征提供了新的途径。研究了基于逆合成孔径成像激光雷达的目标振动微多普勒特征,分析了目标运动时激光信号的高载频和大带宽对目标微多普勒特征的影响,并通过仿真实验对基于逆合成孔径成像激光雷达的目标微多普勒特征和基于微波波段逆合成孔径雷达的目标微多普勒特征进行了比较,证明了逆合成孔径成像激光雷达能够提供足够的分辨率来分析微小目标微动部件带来的多普勒效应。

The inverse synthetic aperture imaging lidar（ISAIL）is a new kind of radar where the inverse aperture technique is introduced into the imaging lidar.ISAIL can obtain the image of target with ultra-high resolution,which provides a new approach for extraction of target′s fine micro-motion features.In the paper,the micro-Doppler（m-D）features of vibration in ISAIL are analyzed,and the influences of high carrier frequency and large bandwidth of laser signal on m-D features are discussed.The m-D features in ISAIL are compared with that in microwave inverse synthetic aperture radar（ISAR）,and the simulations demonstrate that the ISAIL can provide adequate resolution for extraction the m-D features of target with tiny micro-motions.