低脉冲重复频率合成孔径激光雷达成像  

Study of synthetic aperture lidar imaging with lower pulse repetition frequency

作　　者：郭亮[1] 曾晓东[1] 邢孟道[2] 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：《光电子．激光》2011年第5期772-777,共6页Journal of Optoelectronics·Laser

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资助项目(K50510050008);国家"973"计划资助项目(2009CB724004)

摘　　要：为提高合成孔径激光雷达(SAL)的分辨率,从激光脉冲调制与脉冲重复频率(PRF)的矛盾入手,提出了一种沿方位向放置多个望远镜接收的系统设计方法,利用空间自由度解决由于较低PRF带来的方位模糊问题。分析了SAL系统由于平台连续运动的影响(表现为多普勒频移项),提出了多普勒平移补偿方法。通过仿真实验验证了本文所提系统设计的正确性,和所给方法的有效性,有效地解决了方位模糊问题。Synthetic aperture lidar（SAL） is a new active imaging system,which can offer a finer azimuth resolution than conventional SAR systems.The concept of equivalent phase center was described.After analysis of the conflict between the modulation of laser signal and pulse repetition frequency（PRF） of the lidar system,which leads to the ambiguity of the Doppler domain in the azimuth direction,a proper system was given,which uses a series of telescopes placed in the azimuth direction.This system makes use of information of the space domain,and removes the ambiguity of the frequency domain in the azimuth direction.The motion during the transmission of a sweep and the reception of the corresponding echo induce a Doppler shift.And then,a method compensating the Doppler shift iwa given.The simulation results show the validity of the given system and method,which can remove the ambiguity.

关 键 词：合成孔径激光雷达(SAL) 脉冲重复频率(PRF) 方位模糊 成像 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]