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合成孔径激光雷达(SAL)能实现远距离目标的高分辨成像,但是,其测绘带宽一般很小,不利于其在对地观测中的应用。针对这一问题,给出了宽测绘带SAL实际成像范围的建议,具体研究了采用方位向短、距离向长的非对称光斑照明实现宽测绘带SAL的成像处理问题。采用波动光学衍射理论,给出了这种宽测绘带SAL的详细成像理论描述和数学仿真成像演示。结果表明,由于光学的短波长特性,非对称光斑照明的宽测绘带SAL也近似遵循基本SAL图像形成方法:傅里叶变换实现距离压缩,匹配滤波实现方位图像聚焦。
Synthetic Aperture Laser Radar (SAL) can achieve high-resolution imaging of long-range targets, however, its mapping bandwidth is generally small, which is not conducive to its application in earth observation. Aiming at this problem, the author proposes the wide imaging zone SAL, and studies the imaging processing problem of SAL with wide azimuth direction and long distance asymmetric illumination. Using the theory of fluctuating optical diffraction, a detailed imaging theory description and mathematical simulation imaging demonstration of SAL with a wide swath are given. The results show that, due to the short wavelength characteristics of the optics, the wide SAL with asymmetric spot illumination follows the basic SAL image formation approach: Fourier transform to achieve distance compression and matched filtering to achieve azimuth image focusing.