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条带式合成孔径激光雷达(SAL)系统中光轴角包括俯仰角和水平偏离角两方面,其中光轴的水平偏离角会导致发射孔径运动轴与其孔径方位向坐标轴不平行,从而导致距离向图像失真。从理论出发推导出了两轴夹角与其失真关系的公式,并通过实验观察验证了由此引起的距离向图像失真。在实际的条带式SAL系统设计中,这种严重的图像失真是必须要解决的问题。通过点目标对系统进行校正的方法,消去了因两轴夹角而产生的距离向和方位向之间的耦合,是保证SAL系统能进行复杂面目标成像的必要条件。
The optical axis angle in a belt-shaped synthetic aperture laser radar (SAL) system includes both the pitch angle and the horizontal deviation angle, wherein the horizontal deviation angle of the optical axis causes the transmission aperture axis to be non-parallel to the azimuth axis of the aperture, resulting in a distance To the image distortion. Based on the theory, the formula of the relation between the two axes’ angle and its distortion is deduced, and the distance-to-image distortion caused by this method is verified by experiments. In the actual strip SAL system design, this serious image distortion is a problem that must be solved. The method of correcting the system by the point target eliminates the coupling between the distance and the azimuth due to the included angle between the two axes and is the necessary condition for ensuring that the SAL system can perform imaging of a complex plane target.