Automatic attenuator for sonobuoys

Details Automatic attenuator for sonobuoys Automatic attenuator for sonobuoys

1985-09-05

1987-09-01

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Transponders

Sonobuoys and sonobuoy systems

367 5, H04B 1100

Patent

active

046913050

ABSTRACT:
An automatic attenuator for use in Sonobuoy Missile Impact Location System (SMILS) sonobuoys to separate re-entry which impact signatures from other acoustic phenomena is disclosed. The attenuator for the sonobuoy device is divided into a high gain, narrow band channel for detection of ping signals and a low gain, wide band channel for detection of impact signals. The output of the two channels are summed in a summing amplifier. A switch is provided to turn off the high gain channel whenever received signals are large enough to cause a comparator circuit to activate a time which turns off the switch for 15 seconds time. Thus, the stronger impact signals are distinguished from other random signals.

REFERENCES:
patent: 3341810 (1967-09-01), Wallen
patent: 3461421 (1969-08-01), Stover
patent: 3725855 (1973-04-01), Murphree
patent: 4322828 (1982-03-01), Hoff
patent: 4451909 (1984-05-01), Kodera
Caron, "Surface Impact Location System"Proc. of Ocean'72, Inter. Con. on Engineering in the Ocean Environment, Sep. 1972, pp. 462-467.
U.S. patent application Ser. No. 666,784 filed Oct. 31, 1984 by Edwin Westerfield.
U.S. patent application Ser. No. 377,214 filed May 11,1982 by Richard Lane.

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