G - Physics – 01 – S
Patent
G - Physics
01
S
349/48, 343/6
G01S 17/06 (2006.01) G01S 3/74 (2006.01) G01S 17/66 (2006.01) G01S 17/87 (2006.01) G02F 1/33 (2006.01) G06E 3/00 (2006.01) H01Q 3/26 (2006.01)
Patent
CA 1317657
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.
582013
Her Majesty The Queen In Right Of Canada As Represented By The M
Lee Jim P.
Pascal & Associates
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