高速多光谱TDI CCD成像电路系统

Abstract

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.