Acoustic direction finder

Details Acoustic direction finder Acoustic direction finder

1983-05-23

1986-03-18

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With beam steering, scanning, or focussing

367125, G01S 380

Patent

active

045772991

ABSTRACT:
An acoustic direction finding method utilizes correlation between the signals of plural sound pickups on a rotating base. As the base rotates the pickups receive signals from a source of sound which is the target for which direction information is to be obtained, these signals are shifted in time from one pickup to the next. The base is rotated substantially at constant speed with one full rotation being divided into a plurality of angle sections. The pickup signals are correlated in the individual succeeding angle sections, thus obtaining a correlation function with a correlation peak corresponding to the target direction for each angle section. The correlation functions of the same angle section are added to each other with successive rotations of the base. A curve generated by the correlation peaks is then smoothed and utilized to determine the direction of the target. To sense the rotation of the base, a coil is utilized which is fixed to the base and rotates in the magnetic field of the Earth to generate a rotation signal. The frequency of the rotation signal which equals that of the base is multiplied by a multiplier and utilized as a control clock pulse to divide each rotation of the base into the plural angle sectors.

REFERENCES:
patent: 3838593 (1974-10-01), Thompson
patent: 3870989 (1975-03-01), Mallet
patent: 4236159 (1980-11-01), Alpers
patent: 4425634 (1984-01-01), Iino et al.

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