RFSS. Volume 2. Extended Target Model: Real-Time Simulation Program

摘要

This report describes a real-time simulation procedure for generating replicas of an extended target signal to be radiated from the RFSS array to a missile system radar under test. The procedure is purely deterministic. It is based on identifying in the model the location and amplitude of the predominant scattering centers on the target; during the real-time simulation, rays are traced to each scatterer so that the radiated signal is the phasor superposition of the component rays. The missile and target geometries are modeled with six degrees of freedom, and the target motions of roll, pitch, and yaw are included. The instantaneous target aspect is determined so that any scattering dependencies on target aspect can be included in the model. The range dimension of the target is sorted into range bins corresponding to taps on a tapped-delay line. For each tap an angular glint centroid is computed. The procedure permits any target to be simulated; the scattering centers on the target must be identified beforehand as part of the model. This information forms the data base from which the signal is generated. Listings of a Fortran program are included in Appendix B. As written, the program will not run in real time. It is assumed that some portion of it will be implemented on an AP120B array processor to satisfy the real-time requirement.