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采用面阵CCD作为光电成像元件,设计了一种用于动态目标跟踪的新型面阵CCD成像系统。利用分光棱镜的分光效应,将两片CCD分别放置在空间分离的两个像平面上,从而保证在目标分辨率不变的情况下使视场角增加一倍,满足了大视场搜索目标的要求。整个系统采用现场可编程门阵列(FPGA)作为核心控制器件,利用FPGA片上RAM实现两路图像的缓存与合成,合成图像输出延迟仅为32μs,满足实时跟踪的需要。依据系统辐射定标数据,通过变换增益和偏置实现CCD光电响应度的调整,消除了两幅图像拼接处的接缝。
Using area CCD as a photoelectric imaging element, a new area CCD imaging system for dynamic target tracking was designed. Utilizing the spectral effect of the dichroic prism, the two CCDs are respectively placed on two image planes that are spatially separated to ensure that the viewing angle is doubled with the same target resolution, which meets the requirement of large field of view search Claim. The whole system uses field programmable gate array (FPGA) as the core control device, and uses FPGA on-chip RAM to buffer and synthesize two images. The synthesized image output delay is only 32μs, which meets the need of real-time tracking. Based on the system radiation calibration data, the photoelectric response of CCD was adjusted by changing the gain and offset, which eliminated the seams of the two images.