基于角度-多普勒分辨的反射层析激光成像雷达研究  

Angle-Doppler Resolved Reflective Tomography Laser Imaging Radar

作　　者：金晓峰[1] 严毅[1] 孙建锋[1] 吴亚鹏[1] 周煜[1] 刘立人[1] 

机构地区：[1]中国科学院上海光学精密机械研究所中国科学院空间激光通信与检验技术重点实验室,上海201800

出　　处：《光学学报》2012年第8期236-242,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61108069)资助课题

摘　　要：设计了一种基于角度-多普勒分辨的接发同轴反射层析激光成像雷达系统,给出了基本成像原理和数学表达,相应分析了目标横向距离分辨率和单个角度采样时间的关系。并在实验室平台上模拟远场衍射传输,获取探测目标的角度-多普勒分辨的反射投影图,采用滤波反投影算法实现目标横截面图像重建。此方法采用相干外差探测,可以大大提高雷达接收信号灵敏度,同时不涉及光频空间相位和时间相位,成像中没有相位匹配过程,降低了实施技术难度,具有一定的实际意义和使用价值。A system of angle-Doppler resolved reflective tomography laser imaging radar and its algorithm are given. The issue between transverse range resolution and the sampling time of single angle is solved. The condition of far- field diffraction transmission in the laboratory is designed, and the angle-Doppler reflective projections of the target are collected. Filtered back-projection algorithm is used to reconstruct the cross section of the target image. Because of the utilization of coherent detection of coaxial beams, both the imaging signal to noise ratio and the receiving sensitivity are improved. Due to the simplification in configuration and operations without involving signal phase processing, this technique has a great potential for applications in extensive laser radar imaging fields.

关 键 词：成像系统 激光成像雷达 反射层析 多普勒分辨 相干探测 外差平衡接收 

分 类 号：TN958.98[电子电信—信号与信息处理]