Communications – electrical: acoustic wave systems and devices – Underwater system – Telemetering
Patent
1961-03-06
1980-05-13
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Underwater system
Telemetering
367125, 367904, 343100CL, H04B 1100
Patent
active
042031648
ABSTRACT:
A secure sonar communication system for transmitting and receiving intellnce signals within an aqueous medium comprising in combination means for generating an electrical pseudo random noise signal within a predetermined bandwidth, means connected to said pseudo random noise generating means for selectively driving same at one of a plurality of predetermined frequencies, keying oscillator means adapted to selectively produce an output of one of a plurality of predetermined frequency signals, a balanced modulator means coupled to said pseudo random noise signal generating means and said keying oscillator means for mixing the output signals therefrom, bandpass filter means connected to the output of said balanced modulator means for passing the upper sideband thereof, means for receiving an electrical pseudo random noise signal, transducer means, said transducer means being capable of broadcasting acoustical energy upon excitation by the upper sideband from the aforesaid bandpass filter means and in proportion thereto and for producing an electrical pseudo random noise output signal in proportion to a received acoustical pseudo random noise signal, and means connected to the output of said bandpass filter means and the input of said electrical pseudo random noise signal receiving means for selectively connecting same to said transducer means during broadcasting and receiving operations respectively.
REFERENCES:
patent: 2253975 (1941-08-01), Guanella
patent: 2423546 (1947-07-01), Bedford
patent: 2798902 (1957-07-01), Kursman et al.
patent: 2958039 (1960-10-01), Anderson
patent: 3016519 (1962-01-01), Linder
patent: 3022486 (1962-02-01), Gettys et al.
Isaak Robert D.
Klund William E.
Littrell Woodrow H.
Stephenson Richard G.
Critchlow Paul N.
Farley Richard A.
The United States of America as represented by the Secretary of
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