室内实测数据的逆合成孔径激光雷达成像  

Inverse synthetic aperture lidar imaging of indoor real data

作　　者：郭亮[1] 邢孟道[2] 曾晓东[1] 唐禹[2] 

机构地区：[1]西安电子科技大学技术物理学院,陕西西安710071 [2]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《红外与激光工程》2011年第4期637-642,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金委与中国民用航空局联合资助项目(61001210);中央高校基本科研业务费专项资金(K50510050008);国家973计划(2009CB724004)

摘　　要：逆合成孔径成像激光雷达是一种新型主动式有源成像系统,其优势就是可以获得比逆合成孔径雷达更高的分辨率,和更接近光学图片的效果。首先,对逆合成孔径技术的基本原理进行了描述。然后,对数据逆合成孔径激光成像雷达数据模型进行分析。再次,给出了一种基于时频分析的逆合成孔径激光成像雷达成像方法,该方法结合"CLEAN"技术,估计出回波数据的瞬时多普勒谱,利用了回波数据中的二次相位信息,得到瞬时多普勒图像,可以避免距离多普勒算法成像时由于二次相位引起的图像散焦,有效提高了图像质量。最后,实验数据证明了该方法的有效性。Inverse synthetic aperture imaging lidar is a new active imaging system,which can offer a finer azimuth resolution than that achieved in conventional SAR system and obtain vivid images close to the optical photos.Firstly,the principle of the inverse synthetic aperture techniques was described.Secondly,the data of the inverse synthetic aperture imaging lidar were analyzed and the mathematic model of the data was given.Thirdly,a method combined with ＂CLEAN＂ techniques was proposed for inverse synthetic aperture imaging lidar processing,which was based on the analysis of data time-frequency character.The presented method used the second-order phase information of the data in azimuth,estimated the instantaneous Doppler spectrum and obtained the instantaneous images in the range and the instantaneous Doppler domains,which could avoid the defocusing of the images using the range Doppler algorithm and improve the image quality.Finally,the experimental data proves the validity of the presented method.

关 键 词：激光雷达 逆合成孔径 时频分析 成像 

分 类 号：TN958[电子电信—信号与信息处理]