A digital computer program is described which simulates the radar- target engagement providing a representation of the detection, acquisition, and tracking processes. The program is arranged as a time simulation of the engagement between a radar and target, taking into account the detailed characteristics of the target cross section, radar and target motion throughout the engagement, surface clutter, atmospheric attenuation, and radar losses. In the output the program provides the user with target detection probabilities in the presence of surface clutter as well as receiver noise, radar search and track accuracies, signal-to-noise ratios, target characteristics vs time, angular and range rates, etc. The input requirements to the program are: (1) a deck of parameter cards describing the radar parameters, the clutter environment, and the initial radar-target geometry, (2) a deck of cards describing the target motion throughout the engagement, and (3) a deck of cards describing the target's cross section vs aspect angle. Many simplifications to the inputs are allowed for studying and isolating various parts of the radar problem.