NASA NTRS · 19730016433
Intruder detection system
Abstract
An intruder detection system is described. The system contains a transmitter which sends a frequency modulated and amplitude modulated signal to a remote receiver in response to a geophone detector which responds to seismic impulses created by the intruder. The signal makes it possible for an operator to determine the number of intruders and the manner of movement.
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Lee, R. D.. 1973-03-06. Intruder detection system. https://ntrs.nasa.gov/citations/19730016433
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