Communications – electrical: acoustic wave systems and devices – Underwater system – Telemetering
Patent
1981-11-02
1984-01-24
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Underwater system
Telemetering
34087016, 34087026, 367904, 375 6, 375 48, H04B 1100
Patent
active
044280734
ABSTRACT:
An acoustic telemetry system and technique are disclosed for remotely meaing the underwater depth and descent rate of a hydrographic package. Analog signals indicative of hydrostatic pressure exerted on the package and related to its underwater depth are periodically sampled and converted to an N-bit digital word representative of the value of pressure. Each bit of the digital word operates one of a plurality of tone generators of different acoustic frequencies in a narrow band, and the outputs of the tone generators are combined with a reference tone continuously generated to permit resolution of Doppler shifts. Acoustically projected through the water to a remote hydrophone, a composite signal representative of the combined tones is corrected for Doppler shifts by translating the frequency of the signal in accordance with shifts detected in the reference tone. The composite signal is digitally decoded to reproduce the N-bit digital word using a parallel series of frequency detectors each tuned to one of the narrow band acoustic frequencies, and the word is displayed as an indication of underwater depth using a series of latches to ensure a steady data display.
REFERENCES:
patent: 3330909 (1967-07-01), Willson
patent: 3860874 (1975-01-01), Malone et al.
patent: 4005428 (1977-01-01), Graham
patent: 4020449 (1977-04-01), Ito et al.
patent: 4045767 (1977-08-01), Nishihara et al.
Sperry Eng. Review, vol. 19, No. 3, 1966, pp. 25-30.
Baggeroer et al., Oceans 81 Conference Record, 16-18 Sep. 1981, pp. 55-60.
Beers Robert F.
Farley Richard A.
Hansen Henry
The United States of America as represented by the Secretary of
Vozzo, Jr. Armand M.
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