Results are presented of the initial testing of a computer simulation model designed for use by persons not necessarily expert in all or any of the disciplines involved in signature analysis. The model can be utilized for evaluating sensor system performance and prediction of sensor acquisition ranges. The ATIMS III airborne turret infrared measurement system flight experiments and the IASPM simulation model are described. Analysis of preliminary results comparing experimental data with simulated data for the 2- to 5-μm and 8- to 12-μm IR bands reveals the potential of the model for simulating a multitude of sensor-observed phenomena. Model strengths and shortcomings are discussed.