Communications: electrical – Selective – Having indication or alarm
Patent
1974-12-23
1976-03-16
Farley, Richard A.
Communications: electrical
Selective
Having indication or alarm
G01S 380
Patent
active
039449670
ABSTRACT:
In a diver's navigation system employing a receiver having three equal, alarly disposed hydrophone locations, a digital signal processing circuit is employed which receives frequency shift keyed digital data from remote beacons. Circuitry is provided to process this data to derive a bearing indication to the beacon.
REFERENCES:
patent: 3475721 (1969-10-01), Cappel, Jr. et al.
Acks Robert S.
McCracken Howard B.
Watson Stanley J.
Farley Richard A.
Johnston Ervin F.
Sciascia Richard S.
Skeer William T.
The United States of America as represented by the Secretary of
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