Two dimensional acousto-optic signal processor using circular an

Details Two dimensional acousto-optic signal processor using circular an Two dimensional acousto-optic signal processor using circular an

1989-06-01

1990-08-21

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

342376, 330 43, G02F 133

Patent

active

049510614

ABSTRACT:
An interferometric acoustooptic signal processor utilizing a circular antenna array to cover a 360 degree field of view. Each antenna element of the array is connected to an input port of a Butler matrix. The signals are phase shifted within the Butler matrix and applied to a multi-channel periodic Bragg cell, resulting in generation of one or more acoustic waves therein. A laser beam is used to illuminate the Bragg cell and is modulated due to interaction with the acoustic waves, resulting in diffraction of the laser beam and generation of a diffracted beam pattern output from the Bragg cell. A Fourier transform lens focuses the diffracted laser beam on a back focal plane at a point characterized by two perpendicular coordinates designating the input signal power spectrum and the angle of incidence in relation to the antennae, respectively. By utilizing a circular antenna array with a Butler matrix a full 360 degree field of view is obtained using only one 2-D acoustooptic signal processor and the peak sidelobe to mainlobe level is reduced up to -30 dB. Furthermore, the accuracy and resolution of the processor are independent of frequency.

REFERENCES:
patent: Re31772 (1984-12-01), Gerst et al.
patent: 3255450 (1966-06-01), Bulter
patent: 4634230 (1987-01-01), Spezio
patent: 4802149 (1989-01-01), Moore

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