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提出一种位相调制的实时联合变换相关器。它采用液晶显示屏作为输入器件，用液晶光阀记录和显示联合功率谱。利用液晶显示屏上的光栅状结构的衍射级，提高光能的利用率，并充分利用液晶光阀的有效使用面积。采用成像透镜放大各衍射级的联合频谱，适应液晶光阀较低的分辨率要求。在相关器的光路中插入两块倾斜的平行平面玻璃板，以改变各衍射级的参考图像和目标图像之间的位相差。这种方法可产生比传统的实时联合变换相关器更好的输出相关性能。实验结果证实了该系统设计及性能分析的正确性
A phase modulation real-time joint transform correlator is proposed. It uses a liquid crystal display as an input device, with a liquid crystal light valve to record and display the joint power spectrum. Using the diffraction order of the grating-like structure on the liquid crystal display screen, the utilization of the light energy is improved, and the effective use area of the liquid crystal light valve is fully utilized. An imaging lens is used to amplify the joint spectrum of each diffraction order to meet the lower resolution requirement of the liquid crystal light valve. Two inclined parallel plane glass plates are inserted in the light path of the correlator to change the phase difference between the reference and target images for each diffraction order. This approach yields better output-related performance than the traditional real-time joint transform correlator. The experimental results confirm the correctness of the system design and performance analysis