联合变换相关器是一种用于高分辨力空间相机像移量测量的技术，本文采用在图像处理器上运行联合变换相关算法的方法，取代了基于空间光调制器实现的光学相关器，提高了联合变换相关器的空间环境适应性和可靠性。本文通过大量仿真试验，研究了输入图像的尺寸、相对位移量的幅度对算法测量精度的影响，结果表明：在设计联合变换相关器时，增大输入图像的尺寸有助于提高测量的精度和相关器的灵敏度，并且能够防止测量的结果出现奇异值。

Joint transform correlator is a technology used on space camera image motion measurement. The traditional optical joint transform correlator implemented by space light modulator is replaced by electronical joint transform correlator implemented by running the algorithm in a digital processor, which makes correlator adapt to the space radioactive environment and enhances the reliability. By doing massive simulation experiments, the influence of the size of the input images and the relative movement between two input images on the measurement precision of joint transform correlation is analyzed. Results of simulation experiments show that it is necessary to enlarge the size of the input images to increase the precision and sensitivity of joint transform correlator when designing a correlator, and enlarging size of the input images can also prevent singular values showing in the measurement results.