中文摘要：

合成孔径激光雷达成像分辨率与成像距离无关,但在相同激光发射功率的情况下,合成孔径激光雷达的成像分辨率要求与成像距离要求是相互矛盾的。为解决这一问题,从合成孔径激光雷达成像的基本原理出发,给出了合成孔径激光雷达成像的方位分辨率与发射孔径的关系以及回波信噪比方程,分析了回波信噪比与成像距离、光源平均发射功率和发射孔径之间的关系。提出了一种合成孔径激光雷达自适应成像技术,成像系统根据回波信噪比自动调整发射孔径大小使回波信噪比限制在一定范围之内,以实现对远距离目标的大孔径低精度成像以及近距离目标的小孔径高精度成像。研究结果可以为合成孔径激光雷达的设计与应用提供一定的参考。

英文摘要：

In Synthetic Aperture Lidar（SAL）,the imaging resolution is independent of imaging range,but the demands of imaging resolution and that of imaging range are paradoxical when the average laser emission power is the same.To solve the dilemma,the relationship between imaging resolution and emit aperture diameter of SAL was analyzed based on the principle of SAL imaging,and the SNR equation of reflected wave was presented.Factors as imaging range,average emission laser power and emit aperture diameter that have effect on the SNR were analyzed.In the end,a self-adaptive imaging method was proposed for SAL,where the imaging system can adjust the size of emission aperture adaptively according to the SNR of reflected wave to keep it in a certain limit,thus could implement imaging of long-range target at low precision using large aperture,and target close enough at high precision using small aperture.The result is beneficial for the design and application of SAL.