为实现多光谱TDI CCD的高速高信噪比成像, 利用可空间应用的多光谱TDI CCD传感器研制出了高性能成像电路系统。该系统以现场可编程门阵列(FPGA)为核心逻辑单元, 带有RS422外围通信控制接口, 并采用CAMERALINK接口输出图像数据。系统具有动态推扫成像的能力, 可同时输出全色和彩色两种模式的图像数据。利用灰度条纹的靶标对传感器的3个多光谱(R、G、B)感光区标定白平衡, 利用彩色条纹的靶标对系统进行成像测试, 在驱动频率为15 MHz的情况下, 系统单片CCD输出的图像数据率达到12 Gbps。试验结果表明, 获取全色图像的信噪比达到了5356 dB, 各多光谱图像的信噪比较高的也在40 dB以上, 满足空间对地高分辨多光谱遥感成像的技术指标要求, 对高速空间多光谱遥感相机的研制具有借鉴意义。

To complete high speed and high Signal-to-Noise Ratio(SNR) imaging of a multispectral TDI CCD, a high-performance imaging circuit system is designed on a multispectral TDI CCD sensor which can be applied to space. The system is composed of a Field Programming Gate Array(FPGA) to be a kernel logic part, a RS422 communication interface, and an output interface of CAMERALINK, which is capable of outputting the photos under a dynamic scan in two output modes of monochrome and colored image data. A target with grey stripes is used to calibrate the white balance on three multispectral regions(R,G,B) and the imaging test for this system is carried out using colored stripe target. The output image data rate reaches 12 Gbps under a driving frequency of 15 MHz. The SNRs of monochrome and colored images are up to 5356 dB. The system meets the specification of space observation with high resolution on multispectral sensors and provides a support for the design of high-speed multispectral cameras in space.