Communications – electrical: acoustic wave systems and devices – Transponders
Patent
1971-03-09
1980-02-19
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Transponders
G08B 1300
Patent
active
041897013
ABSTRACT:
Various types of rivercraft propelled by motor, poling, sculling or paddl are found to generate broadband noise having a superimposed low frequency sinusoidal modulation. To detect the presence of such craft, a hydrophone, tethered in a river from a moored subsurface float is connected to a concealed transmitter located on the bank. The detected audio signal is demodulated and filtered. When classification criteria have been satisfied, a gate opens allowing the demodulation information to be processed by a logic circuit, which, if satisfied, causes the hydroacoustic signal to be transmitted over an RF link to a remote receiver station.
REFERENCES:
patent: 2961869 (1960-11-01), Bagno
patent: 3320576 (1967-05-01), Dixon et al.
Caro Jasper
Formica Vincent A.
Torok Steve F.
Farley Richard A.
Hansen Henry
Hennessey G. H.
Sciascia R. S.
The United States of America as represented by the Secretary of
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