Digital Computer Simulation for Prediction and Analysis of Electromagnetic Interference

A digital computer simulation program is described for use by communications systems and equipment designers who must consider electromagnetic interference. The program determines the interference experienced by a test receiver in a signal environment resulting from its associated transmitter, a large deployment of potentially interfering transmitters, and by atmospheric and cosmic noise sources. Simulation models are designed to represent such transmitter characteristics as antenna gain and scan patterns, polarization and emitted power spectrum; other models represent propagation phenomena such as scattering, reflection, fading and tropospheric refraction; and such receiver characteristics as antenna gain patterns, frequency selectivity and demodulator transfer characteristics. Signal acceptability criteria are included to permit system scoring. Program flexibility is stressed so that optimum system design may be achieved through rapid evaluation of successive approximations.