Communications – electrical: acoustic wave systems and devices – Echo systems – Parametric sonar
Patent
1986-06-02
1987-09-29
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Parametric sonar
367101, G01S 966, G01S 968
Patent
active
046972544
ABSTRACT:
Sonar ice thickness measurement comprises transmitting an AM and subsequent CW sonic radiant energy signals from the water toward the sonic signal reflecting ice cap. Reflection of the CW signal from the water-ice interface and reflection from the water-air interface of the modulating frequency, generated by non-linear or parametric effects in the water by the modulated transmit signal, causes the CW signal to be modulated to generate side bands at the modulating frequency on each side of the carrier frequency to provide an FM high frequency signal. Detection of the FM signal determines the time of arrival of the echo of said detected FM signal relative to the detection of the reflected modulated signal from the water-ice interface.
REFERENCES:
patent: 3267416 (1966-08-01), Morse
patent: 3786405 (1974-01-01), Chramiec et al.
Pihulic Daniel T.
Raytheon Company
Santa Martin M.
Sharkansky Richard M.
Tarcza Thomas H.
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