Communications – electrical: acoustic wave systems and devices – Transponders
Patent
1973-10-25
1981-08-04
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Transponders
367135, H04B 159
Patent
active
042825857
ABSTRACT:
An acoustic system for covertly detecting surface to air missile (SAM) si by monitoring for noise emitted by the electrical power generated at the sites. The output of a microphone is sharply filtered around 75 Hz and a phase lock loop locks onto the signal and tracks slight deviations. By timing logic, signals of at least 7 minutes duration with interruptions of 10 seconds or less are considered SAM targets.
REFERENCES:
patent: 3474405 (1969-10-01), Padbero, Jr.
patent: 3564493 (1971-02-01), Hicklin
patent: 3656097 (1972-04-01), Massa
patent: 3686658 (1972-08-01), Wilt
Formica Vincent A.
Lange George P.
Torok Steve F.
Farley Richard A.
Hansen Henry
Sciascia R. S.
The United States of America as represented by the Secretary of
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