Research on high-speed TDICCD remote sensing camera video signal processing

摘要

Video signal processing needs high signal-to-noise ratio(SNR) in high-speed time delay and integration charge coupled devices(TDICCD).To solve this problem,this article first analyzes the characteristics of the output video signal of a new type of high-speed TDICCD and its operation principle.Then it studies the correlation double sample(CDS) method of reducing noise. Following that a synthesized processing method is proposed,including correlation double sample,programmable gain control, line calibration and digital offset control,etc.Among the methods,XRD98L59 is a video signal processor for the charge coupled device(CCD).Application of this processor to one kind of high-speed TDICCD with eight output ports achieves perfect video images.The experiment result indicates that the SNR of the images reaches about 50 dB.The video signal processing for high-speed multi-channel TDICCD is implemented,which meets the required project index.