Abstract：The mechanism of MTF(modulation transfer function) and SNR(signal noise ration) degradation in the spaceborne TDI CCD(time-delayed-integration charge coupled device) optical camera imaging process was studied in this paper. Using the mathematic models at different stages as nodes and the signal transmission and conversion process as the framework, the authors studied the descriptive means for the signal and simulation method of MTF and SNR degradation in every node. The MTF and SNR simulation flow of synthetically response was brought forward on the basis of FFT and random noise of given distribution creating arithmetic. The method mentioned above can be applied to the MTF and SNR comprehensive response simulation in one or several links. The simulation test of TDI CCD camera was conducted crossing orbit MTF and along orbit MTF and SNR by using this method.
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2013, Vol. 25 
