The subject of this paper is a simulation technique which has been developed to evaluate the performance of standard scan (525 line) TV contrast trackers in the laboratory. The simulation, developed in conjunction with a comparative flight test of TV contrast trackers conducted at Holloman AFB, New Mexico, makes use of a basic technique similar to the "instant replay." Video tape recordings are made with appropriate video instru-ipentat.:_minstalled in a C-130 "flying laboratory" as the aircraft simulates attack passes against various ground targets. The recorded video is then played back into a contrast tracker in the laboratory to evaluate the contrast tracker performance. This simulation technique is discussed in detail in the paper along with a description of the technique employed to demonstrate the accuracy and validity of the simulation results. In addition, the paper includes a brief discussion of future simulation requirements.