Abstract
An extensive computer simulation has been developed to study the susceptibility of digital receivers to various interference sources. Receivers using PCM-FM and four-phase DPSK modulation techniques have been programmed on EAI 8800 analog computers containing large complements of digital logic elements. Emphasis is placed on the use of these simulations for susceptibility studies, but their use is not restricted to these studies. The adaptability of these simulations to various versions. of PCM-FM and four-phase DPSK receivers can be accomplished by making small changes in the modulation and demodulation techniques discussed. By using the analog computer it is possible to model various types of interference sources. This eliminates the necessity for outboard electronic gear to represent the desired interference sources.Analog programming techniques also proved very valuable in generating various indicators and measuring devices, This also eliminated several pieces of outboard gear, making each simulation a compact piece of instrumentation. The hands-on approach to simulation, which is available only to the analog programmer, allows the investigator to rapidly change configuration of the receiver model and interference sources. The methodology of analog/hybrid simulation allows easy access to various junctions within the receiver. Various interferences were modeled and applied to desired points within the receiver simulations. Some of these interferences were continuous wave (CW), various frequency modulated interferences (FM), and radar interferences. Also modeled were PCM-FM and four-phase DPSK interferences. A secondary use of the simulation would be its use in the modification optimization and design of a receiver. A future addition to the receivers simulated will be an automatic control of the simulation from a digital computer. This automation will enable one to sequence through various tests automatically and perform some analysis and plotting functions now being accomplished by hand.
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