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为扩大观测范围,航天遥感仪器通常采用45°指向镜扫描。在采用多元探测器的遥感仪器中,焦平面上所成的像不允许产生像旋,否则会使各个像元所对应的视场无法配准。因此,研究相应的像消旋方法,消除45°指向镜成像系统带来的像旋转,使其能够更好地应用于生产实践,是一个十分迫切的问题。对45°指向镜生成的图像的畸变特性进行了分析,同时根据每个像元坐标与地面坐标的对应关系,给出了校正图像畸变的方法。合成图像和真实图像的模拟实验结果表明:提出的畸变校正方法能够很好地校正45°指向镜的成像图像,在工程应用中具有重要的实用意义。
To expand the scope of observation, space remote sensing instruments usually use 45 ° pointing mirror scanning. In multi-sensor remote sensing instruments, the resulting image on the focal plane is not allowed to produce image rotation, otherwise the corresponding field of view of each pixel can not be registered. Therefore, it is a very urgent problem to study the corresponding method of racemization and eliminate the image rotation caused by the 45 ° pointing mirror imaging system, so that it can be better applied to the production practice. The distortion characteristic of the image generated by the 45 ° point mirror was analyzed. At the same time, the method of correcting the image distortion was given according to the correspondence between each pixel coordinate and the ground coordinates. The simulation results of synthetic images and real images show that the proposed method can correct the image of 45 ° pointing mirror well and has important practical significance in engineering application.