2 December 1992 Photorefractive adaptive sidelobe canceler for phased-array antennas
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Abstract
This paper reports on the continuation of work on photorefractive correlation and tapped delay line structures for the implementation of adaptive signal processors. A six channel implementation of a sidelobe canceling system will be described. The laboratory model is approximately 30 cm in length. It uses indium phosphide as the photorefractive material and a six channel tellurium dioxide Bragg cell delay line. A time integrating correlator uses a 1.2 micron 'write' laser. The correlation coefficients are applied to tap the delay line with a 1.3 micron read laser. A combination of polarization and wavelength multiplexing are used to obtain greater than 60 dB read/write isolation. The system is designed to achieve greater than 40 dB of suppression of CW interference over a 20 MHz band centered at 70 MHz. The adaptation time for pulsed CW interferers is designed to achieve greater than 30 dB suppression within 100 microseconds.
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Robert M. Montgomery, Robert M. Montgomery, William B. Beaudet, William B. Beaudet, Michael R. Lange, Michael R. Lange, } "Photorefractive adaptive sidelobe canceler for phased-array antennas", Proc. SPIE 1703, Optical Technology for Microwave Applications VI and Optoelectronic Signal Processing for Phased-Array Antennas III, (2 December 1992); doi: 10.1117/12.138409; https://doi.org/10.1117/12.138409
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