Inventors:
Lawrence C. Pharo - State College PA
Assignee:
The United States of America as represented by the Secretary of the Navy - Washington DC
International Classification:
G08B 1300
Abstract:
A method and means for passively detecting presence of noise radiating dees in a noise environment by determining the number of times per time sample that a received noise signal upwardly crosses a preselected threshold level, comparing this number with the number of upward crossings caused by a standard noise signal or background noise signal, and applying a predetermined ratio criteria. The noise sensors in the detection system may comprise a directional acoustic transducer in combination with an omnidirectional acoustic transducer, and acoustic transducer in combination with an artificially generated noise signal, or a single acoustic transducer.