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.

To measure the image motion caused by satellite attitude instability or various disturbance,an effective approach is proposed to measure high-precision image motion by opto-electric hybrid joint transform correlator(JTC) based on light speed processing.An auxiliary high-speed CCD is used to capture image sequences in the exposure period when the prime CCD captures the same target object.These sequence images are sent to spatial light modulator and optically calculated by JTC system,and then relatively image motion can be measured.The principle of this approach is demonstrated,and the measurement precision is analyzed under different noise and image motion.The corresponding motion measurement system is set up.The numerical simulation and experimental results show that the measurement precision is less than 0.1 pixels.