Accession Number : ADD013359

Title :   Automatic Attenuator for Sonobuoys.

Descriptive Note : Patent, Filed 5 Sep 85, patented 1 Sep 87,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Kuck, John H

Report Date : 01 Sep 1987

Pagination or Media Count : 7

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 high gain, narrow band channel for detection of ping signals and 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.

Descriptors :   *ATTENUATORS, *COMPARATORS, *SONOBUOYS, *PATENTS, *ORDNANCE LOCATORS, AUTOMATIC, BROADBAND, CHANNELS, CIRCUITS, DUAL CHANNEL, GAIN, HIGH GAIN, IMPACT, LOW LEVEL, NARROWBAND, SIGNAL PROCESSING, SIGNALS, SIGNATURES, SWITCHES, WATER ENTRY, REENTRY VEHICLES, IMPACT POINT, PINGERS, GLOBAL POSITIONING SYSTEM

Subject Categories : Acoustic Detection and Detectors
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE