Accession Number:

ADA275762

Title:

Photorefractive Adaptive Antenna Array Processor

Descriptive Note:

Final rept. Dec 1990-Jun 1993

Corporate Author:

HARRIS CORP MELBOURNE FL GOVERNMENT COMMUNICATION SYSTEMS DIV

Report Date:

1993-12-01

Pagination or Media Count:

90.0

Abstract:

The objective of this contract was to build a laboratory model of a six channel adaptive antenna array processor using acousto-optic delay lines with a photorefractive structure which both computes and applies the adaptive tap weights. The major performance goal of greater than 40 dB suppression for a single narrowband interferer at a fixed frequency in the band was exceeded by 10 dB suppression for narrow band interference. This substantially exceeds that attained by previous optical processors. A goal of greater than 37 dB suppression for a narrow band signal at any frequency in a 20 MHz band was also exceeded. The goal of 20 dB rejection for a signal with 10 MHz instantaneous bandwidth was met with difficulty. To meet this goal, an extensive analysis of the limitations of LMS algorithm processors was required. This analysis indicates that the system was actually performing close to theoretical limits tor this design. The analytic and experimental results are reported here. Photorefractive, Acousto-optic processing, LMS Algorithm, Interference rejection, Adaptive processor, Indium phosphide, Bragg cell.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE