为测量卫星遥感相机因姿态不稳定以及各种扰动引起的亚像素像移，提出了基于光学相关的双CCD成像系统的图像运动测量方法。在主成像系统成像的同时，辅助高速CCD获取同一目标的图像序列，利用联合变换相关器对所采集的图像序列进行光学运算，测量出相邻图像序列的运动位移。阐述了使用光学相关方法测量像移的原理，并模拟分析了噪声和运动条件下的测量精度。建立了使用该方法测量像移的实验系统。实验结果证实了该方法的有效性，测量精度小于0.1 pixel，满足卫星遥感相机的使用要求。

To measure the sub-pixel image motion caused by satellite attitude instability or various disturbance, an effective approach to measure image motion by dual-CCD imaging system based on joint transform correlator (JTC) is presented. An auxiliary high-speed CCD is used to capture image sequences which are the same scenes as those images captured by the prime CCD. These image sequences are optically calculated by JTC system, and then relatively motion displacement can be obtained. The principle of this approach is represented, and measurement precision is analyzed in the condition of noise and image motion. Motion measurement system is also presented, and the experimental results show that the measurement precision can be controlled within 0.1 pixel.