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为测量航天遥感相机因姿态不稳定以及各种扰动引起的图像运动,提出了基于光速处理的高精度光电混合相关探测测量方法。利用高速CCD和主CCD对同一目标进行成像,在曝光时间内高速CCD获取序列图像,利用联合变换相关器对所采集的图像序列进行光学运算,测量出相邻序列图像的运动位移。阐述了光学相关方法测量图像运动的原理,并模拟分析了噪声和不同运动条件下的测量精度。建立了相应的测量像移的实验系统,实验数字模拟及实验结果都证实了该方法的有效性,测量精度优于0.1像元,满足卫星遥感相机的使用要求。
In order to measure the image motion caused by the unsteady attitude and various disturbances of the space remote sensing camera, a high precision photoelectric hybrid correlation detection and measurement method based on light speed processing is proposed. The same target is imaged by high-speed CCD and main CCD. High-speed CCD acquires the sequence image during exposure time. The joint transformation correlator performs optical operation on the acquired image sequence to measure the motion displacement of the adjacent sequence image. The principle of optical correlation method for measuring image motion is described, and the noise and measurement accuracy under different motion conditions are simulated and analyzed. The corresponding experimental system of measuring image shift is established. The experimental numerical simulation and experimental results confirm the effectiveness of the proposed method. The accuracy of the proposed method is better than 0.1 pixel, which meets the requirements of satellite remote sensing camera.