光学精密工程2018，Vol.26Issue(2)：276-283,8.DOI:10.3788/OPE.20182602.0276
微弱回波条件下差分合成孔径激光雷达成像实验演示
Experimental demonstration of differential synthetic aperture ladar imaging at very low return level
摘要
Abstract
Weak echo signal and motion errors are the features of differential synthetic aperture ladar (DSAL)that should be addressed in its future application scenarios.To achieve this,a laboratory DSAL demonstration of random piston motion target at very low return level is reported.Using 1 550 nm laser source,a DSAL imaging setup is built,with receiving apertures spacing of 188 μm and target distance of 2.4 m.The transmitted laser power is attenuated by adding a polarizer to the transmitter and random piston motion errors are introduced into the optical path between the target and the ladar, by using a stepping linear translation platform.At the transmitted power of approximately 20 nW and 50 nW,DSAL imaging experiments are carried out for random piston motion target with optical path variation range of -[5 μm,5 μm].Under these experimental conditions,the synthetic aperture ladar (SAL)images are completely defocused due to random phase errors,but the DSAL images are well focused.The results indicate that the DSAL system could eliminate phase errors and achieve stable imaging at very low return levels.关键词
激光雷达/差分合成孔径/实验演示/微弱回波/随机活塞运动Key words
ladar/differential synthetic aperture/experimental demonstration/weak echo/random pis-ton motion分类
信息技术与安全科学引用本文复制引用
赵志龙,吴谨,王海涛,李明磊,董涛,国辉,夏正欢..微弱回波条件下差分合成孔径激光雷达成像实验演示[J].光学精密工程,2018,26(2):276-283,8.基金项目
国家自然科学基金资助项目(No.61178071) （No.61178071）
