Acoustic amplitude-doppler target ranging system

Details Acoustic amplitude-doppler target ranging system Acoustic amplitude-doppler target ranging system

1981-07-27

1983-10-18

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

102427, F42C 1306

Patent

active

044098995

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.

REFERENCES:
patent: 2341351 (1944-02-01), Barkley
patent: 2489255 (1949-11-01), Barker
patent: 3115833 (1963-12-01), Hall et al.
patent: 4135452 (1979-01-01), Kinsey et al.
patent: 4189999 (1980-02-01), Anderson
patent: 4207623 (1980-06-01), Anderson

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