Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1971-09-29
1982-06-29
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367 94, G01S 1550
Patent
active
043375278
ABSTRACT:
An oscillator generates a fixed frequency ultrasonic output signal. After wer amplification this signal drives a transmitting transducer which projects an ultrasonic beam into water. Reflected signals are received by a receiving transducer and AGC preamplified. A chopper multiplies the received signal with the transmitted signal and generates an output signal if a target exists. To determine whether the target is a swimmer, this output signal is band pass filtered and amplified and then fed both to an automatic alarm and to a set of headphones. A human operator listening to the headphone output classifies the target and determines exact bearing.
REFERENCES:
patent: 2961190 (1960-11-01), Miller et al.
patent: 3394342 (1968-07-01), Walker
patent: 3646506 (1972-02-01), Suter
Delagrange Arthur D.
Pryor, Jr. Cabell N.
Wilson Wayne D.
Branning A. L.
Farley Richard A.
Sciascia R. S.
The United States of America as represented by the Secretary of
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