Abstract
To quantitatively assess factors affecting the Signal to Ratio(SNR)of a Time Delay Integration(TDI)CCD camera,the imaging principle and noise sources of the TDICCD space camera were researched and a SNR model was established.The effects of the radiance lightness,integration stages,line transfer frequency and the system gain(analog gain)on the SNR were analyzed.A laboratory radiation calibration system was established to simulate the on-orbit radiance conditions of the camera.The relationship between the SNR and different working parameters were verified by radiation calibration.The calibration results show that the photon shot noise,dark current noise and the fixed pattern noise play a major role in all kinds of noise.The output signal and the SNR of the camera increase with the raises of the radiance,integration stages and the system gain and decrease with the raise of the line transfer frequency.The varieties of these factors have different influences on the SNR.Specifically,when the variations of the radiance,integration stages and the line transfer frequency are respectively Ltimes,Mtimes andτtimes,the variations of the SNR are slightly larger than L1/2 times,M1/2 times,τ-1/2 times,respectively.Moreover,the influence of the system gain on the SNR is in a relatively small range and the variation of the SNR decreases gradually with the raise of the system gain.
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