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航空相机在多航迹成像方式中,随着45°反射镜绕光轴旋转对物进行扫描,物体反射像也将绕光轴进行旋转,为此必须采取消除像旋转的措施来保证成像质量。为阐述产生像旋转的原因,分析了扫描反射镜的像旋转特性;并在探讨消除像旋技术理论的基础上,提出了一种反射镜与探测器同步转动消除像旋转的方法。在多航迹工作方式中,此方法为相机扫描机构连续扫描成像提供了必要条件。利用此方法还改进了以往步进式扫描机构的惯量大、扫描效率低的问题,并在实际工程中得以应用和证明。试验结果表明,该方法的同步旋转误差小于1/3像元,能够获得良好的图像效果。
Aerial camera In multi-track imaging mode, as the 45 ° mirror rotates around the optical axis to scan the object, the object reflection image will also be rotated around the optical axis. Therefore, the image rotation must be eliminated to ensure the imaging quality. In order to explain the cause of image rotation, the image rotation characteristics of the scanning mirror are analyzed. Based on the theory of eliminating the image rotation technology, a method of synchronizing the rotation of the mirror and the detector to eliminate image rotation is proposed. In the multi-track working mode, this method provides the necessary conditions for the continuous scanning imaging of the camera scanning mechanism. The method also improves the inertia of the conventional stepping scanning mechanism and low scanning efficiency, and has been applied and proved in practical engineering. Experimental results show that the proposed method can achieve good image quality with less than 1/3 pixel error of synchronous rotation.