大口径合成孔径激光成像雷达演示样机及其实验室验证  

A Large-Aperture Synthetic Aperture Imaging Ladar Demonstrator and Its Verification in Laboratory Space

作　　者：刘立人[1] 周煜[1] 职亚楠[1] 孙建锋[1] 吴亚鹏[1] 栾竹[1] 闫爱民[1] 王利娟[1] 戴恩文[1] 鲁伟[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及检验技术重点实验室,上海201800

出　　处：《光学学报》2011年第9期104-108,共5页Acta Optica Sinica

基　　金：国家自然科学基金委员会青年基金(60908029;60907006;60807024);上海市自然科学基金(09ZR1435300)资助课题

摘　　要：合成孔径激光成像雷达(SAIL)的主要技术指标如光学足趾尺寸和成像分辨率等都必须在所设计的远距离传输后实现。提出了一种在实验室空间近距离实现SAIL全系统贯通验证的方法,即在SAIL中附加光学装置使得其在近距离产生发射光束的准几何投影和足够大的外差接收视场,从而产生近距离二维SAIL成像必需的并且适当的光学足趾和方位向二次项相位历程。给出了一种Φ300 mm口径合成孔径激光成像雷达演示样机的主体结构和光学附件装置的设计方案,实现了实验室空间近距离演示验证,给出了在14 m传输距离上的二维SAIL成像动态演示的结果,实验测得光学足趾达到22 mm×22 mm,成像分辨率优于1.4 mm(方位向)×1.2 mm(距离向)。The main specifications of synthetic aperture imaging ladar（SAIL）,such as the size of optical footprint and the imaging resolution etc.,can be realized only in the case of designed long transmission distance.This paper proposes a method to systematically verify an SAIL in the close distance of laboratory space.The SAIL is modified with the additional optical elements to produce both a geometric projection of transmitting beam onto the target and an enough large field of heterodyne reception.Therefore,the optical footprint and quadratic phase history essential and suitable for two-dimensional（2D） SAIL imaging in the close distance can be generated.A major structure of Φ300 mm SAIL demonstrator modified with the accessory optical elements is designed and then verified experimentally in a 14 m distance to the target.The result of well-focused 2D SAIL dynamic imaging is obtained.The optical footprint size is measured as 22 mm×22 mm and the imaging resolution is better than 1.4 mm（azimuth） ×1.2 mm（range）.

关 键 词：遥感 合成孔径激光成像雷达 实验室空间近距离验证 相位历程 

分 类 号：TN958[电子电信—信号与信息处理]