Passive method for obtaining target data from a sound source

Details Passive method for obtaining target data from a sound source Passive method for obtaining target data from a sound source

1983-02-10

1985-12-10

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With time interval measuring means

367136, G01S 1100, G01S 518

Patent

active

045584397

ABSTRACT:
A passive method for obtaining target data from a sound source disposed in a nonsolid medium by means of a sound receiver remote from the sound source, by the steps of: providing, as the sound receiver, first and second sound-to-electrical signal transducers constituted and positioned to each respond to a respective one of two sound waves propagated from the sound source to the sound receiver at respectively different propagation speeds; and deriving, by means of an electrical signal processing system connected to receive output signals from the transducers, target data from the sound source by determining the frequencies of, or the difference in reception time between, the sound waves emitted by the source and to which the two transducers respond.

REFERENCES:
patent: 1341795 (1920-06-01), Fessenden
patent: 2398432 (1946-04-01), Livermore
patent: 3182283 (1965-05-01), Ellingson et al.
patent: 3895344 (1975-07-01), Gill, Jr. et al.
patent: 4001771 (1977-01-01), Amrine et al.
patent: 4122432 (1978-10-01), Triebold et al.
patent: 4158832 (1979-06-01), Barnes, Jr. et al.
patent: 4271412 (1981-06-01), Glass et al.

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