The Human Engineering Electronic Countermeasures Simulator.

Abstract : The report describes the Human Engineering Electronic Countermeasures (HEECS) and the procedures used in its operation. The basis of the HEECS is an AN/ALQ-T4 Electronic Warfare Crew Station (T-4) trainer reconfigured to operate as a research tool. The trainer interfaces with an IBM 360, model 40, which controls presentation of threat signals to the subject and serves as an automatic data collection system. The IBM 360 also simulates on-board digital computers and digital logic circuitry for specific pieces of equipment. The report is intended to acquaint the research, design, and operational communities with the capability and flexibility of this new systems simulator. Some of the problem areas addressed are: (1) the communication problems between an analog machine with a reference voltage supply of +300 volts and a digital converter which accepts only a range of +5 to -5 volts; and (2) the problem of filtering out analog changes due to noise on the signal, as opposed to actual changes by the subject. There is also a discussion of system-effectiveness measures used by human engineers to evaluate performance. (Author)