单程远场衍射合成孔径激光雷达成像实验室演示

Synthetic aperture ladar imaging with one-way far-field diffraction

报道了一个采用单程远场衍射照明的合成孔径激光雷达成像实验室演示实验.采用1 550 nm光纤激光,在目标距离约2.4 m的位置上,实现了良好聚焦的SAL成像,图像方位向分辨率约560μm,距离向分辨率170μm.聚焦图像的形成只应用了基本SAL成像理论,无需辅助相位自聚焦(PGA)技术.详细的实验图像展示了典型的SAL成像两步聚焦过程和图像的高分辨率.

A laboratory SAL setup produced well-focused SAL images using laser illumination with one-way far-field diffraction. Using 1550 nm fiber laser, the SAL can focus images from target distance of about 2.4 m with azimuth resolution of about 560 μm and range resolution of about 170 μm. High-resolution SAL images are generated by straightforwardly following standard SAL image formation theory, without the aid of phase gradient autofocus （PGA） technique. Detailed results show a typical two-step SAL focusing process and a high resolution image.