Imaging Simulation of Sub-meter Satellite TDI CCD Camera for Surveying and Mapping

This paper details a meticulous ground model using triangular networks and furring texture images as well as imaging simulations of TDI CCD cameras for surveying and mapping. The sight target index was built by projecting the ground triangular network to the image，and then evaluated to see if a ground point was visible in the camera and sun direction by "imaging" in these two directions，and creating a shadow. The TDI CCD plane was divided into small CCDs and the irradiance of every small CCD was computed to get the“continuous focal plane irradiance image". The static MTF was simulated by filtering the“continuous focal plane irradiance image" using PSF. The integration time was divided and the filtered static image computed for every sub-time，then the images added for every sub-time to get the "time mean static image". Then，graupel noise was added to every "time mean stat is image" of every line CCD，and then，adding the "time mean static image" of the same target by different CCD lines to get the average energy image，thus realizing TDI CCD multistage dynamic imaging simulation. In this manner，it was possible to derive the camera setting angle and optical panel point transfer function from platform coordinates to object coordinates，realizing an imaging simulation for any incline angle and setting angle by integrating attitude and CCD distortion parameters.