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为了实现对前向像移的补偿,提出一种通过合理调整快门曝光时间和飞机速高比之间的关系来补偿前向像移的方法,对前向像移产生的原因进行研究。介绍彩色面阵CCD工作原理、相机工作原理,从光学系统成像原理的角度分析产生前向像移的原因,还分析了速高比和曝光时间误差。实验结果表明:速高比误差和曝光时间误差均可控制在合理误差范围内,满足前向像移量小于1.5个像元尺寸的补偿要求,达到了测绘相机的精度指标。
In order to compensate for the forward image shift, a method of compensating the forward image shift by reasonably adjusting the relationship between the shutter exposure time and the aircraft speed ratio is proposed, and the reason of the forward image shift is studied. The working principle of the color area array CCD and the working principle of the camera are introduced. The reason of the forward image shift is analyzed from the perspective of the optical system imaging principle. The error of speed ratio and exposure time are also analyzed. The experimental results show that the error of speed ratio and exposure time can be controlled within a reasonable error range, which satisfies the compensation requirement of less than 1.5 pixel shift of the forward image, and achieves the precision index of the mapping camera.