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航空相机在拍照瞬间由于飞机的飞行运动和姿态变化而产生像移,要提高照相分辨率必须通过像移补偿来实现。采用在相机与飞机间增设三轴稳定平台的机械式像移补偿法来补偿姿态像移和前向像移,三轴稳定平台的三轴按照与飞机姿态变化角速率相等、方向相反进行旋转补偿姿态像移,三轴稳定平台的俯仰轴以飞行方向反方向、角速率等于速高比旋转补偿前向像移,并采用坐标变换法计算像移补偿后的残差,通过分析面阵CCD相机像面各点在进行像移补偿后的像移残差均小于1/3像元,符合成像要求。
Aerial camera in the photo moment due to the aircraft’s flight movement and attitude changes produce image shift, to improve the camera resolution must be achieved by the image shift compensation. The mechanical image shift compensation method is used to compensate the attitude image shift and the forward image shift by adding a three-axis stable platform between the camera and the aircraft. The three axes of the three-axis stable platform rotate at the same angular rate according to the attitude change of the aircraft and rotate in the opposite direction Attitude shift, the axis of the three-axis stabilized platform in the flight direction of the reverse direction, the angular velocity equal to the speed ratio of the rotation compensation for the forward image shift, and coordinate conversion method to calculate the residual image shift compensation, through the analysis of surface array CCD camera The image residuals after image shift compensation are all less than 1/3 pixel, which meets the imaging requirements.