A simulation model has been developed to analyze Infrared Imaging systems. This model synthesizes an optical point spread function and convolves it with target and detector configurations to produce a target signal. The model includes the effects on the signal of detector responsivity contours, varying target shapes, noise and various electronic filtering and signal processing methods. The model runs on CDC 6600/7600 computers and requires about 40 seconds processor time per run when exercising all options. Outputs are in the form of tables, printer plots and calcomp plots.