Accession Number:

ADD010639

Title:

Acoustic Amplitude-Doppler Target Ranging System.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s):

• Owen,T. E.
• Suhler,S. A.
• Peters,W. R.

Report Date:

1983-10-18

Pagination or Media Count:

11.0

Abstract:

An acoustic target sensor and ranging system automatically detects military targets and provides a munition firing signal at the appropriate target position and time. An amplitude-doppler circuit is utilized to predict the time of closest approach to a munition by a target by measuring the time interval between zero crossings of the second and third derivatives of the received acoustic wave amplitude function. The circuit produces a firing signal by logically ANDing the closest point of approach signal it develops with a signal that indicates when target range is within specified limits. The circuit is realized by means of conventional electronic zero crossing detectors, an up-down counter, dividers, sample and hold devices and voltage comparators. The acoustic target signal is obtained from an omni-directional microphone the output of which is amplified and rectified. Author

Descriptors:

• *Patents
• *Firing circuits
• *Acoustic detectors
• *Range finding
• *Proximity fuzes
• Surface targets
• Aircraft detection
• Seismic signatures
• Acoustic signatures
• Doppler effect
• Amplitude
• Threshold effects
• Microphones
• Omnidirectional
• Surface targets
• Aircraft signatures
• Moving targets
• Target signatures
• Target activated munitions
• Logic circuits
• Comparators
• Acoustic signals
• Signal processing

Subject Categories:

• Electrical and Electronic Equipment
• Acoustic Detection and Detectors
• Seismic Detection and Detectors
• Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE