基于面阵CCD拼接的动态目标成像系统

Moving Target Imaging System Based on Joint Area CCD

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 the area array CCD as a photovoltaic imaging device,a new area CCD imaging system which is used in the moving target tacking was designed.Using the prismatic function of the spectroscope,two slices of the area CCD were put on two image planes,ensuring them to share a complete surface.So this can ensure twice as larger the angle of visual field under a constant condition of target resolution capacity,which can meet the requirements for searching target in a large visual field.The entire system adopts the Field Programmable Gate Array（FPGA）as the key controller and uses the on-chip RAM of the FPGA to realize the two-way cache and synthesis of the images.The output delay of the synthetic images is only 32us,which satisfies the requirement of the moving target tacking.According to the scale experiment data given in the paper,the CCD photoelectric response is adjsted by transforming the CCD gain and offset,eliminating the joints of two images.