Accession Number : ADA310906

Title :   Anti-Jamming Optical Beam Nuller.

Descriptive Note : Rept. for Oct 92-Sep 95,

Corporate Author : ROME LAB ROME NY

Personal Author(s) : Turbyfill, Michael E. ; Lutsko, Jeffrey M.

PDF Url : ADA310906

Report Date : MAY 1996

Pagination or Media Count : 56

Abstract : The development of an Acousto-optic (AO) based anti-jamming optical beam nuller (AJOB),including laboratory and live radar tests, is presented. The purpose of the AJOB system is the cancellation of multipath jamming interference in advanced surveillance radars. AJOB is a multichannel adaptive optical system which performs cancellation of multiple wideband (10 MBz) interference sources in the presence of multipath. The live radar test consisted of using a downconverted 80 MHz received signal from the main and subarrays of a C-band radar to correlate jamming signals produced by stationary jammers. The correlation parameters fed a tapped delay line filter to form an estimate of the noise, which was subtracted from the main antenna signal. For the scenarios tested, the long integration time for the correlation data provided accurate estimates of the jammer delays, and therefore single-step convergence was achieved.

Descriptors :   *RADAR ANTIJAMMING, *ACOUSTOOPTICS, ALGORITHMS, OPTICAL EQUIPMENT, ACCURACY, TRANSMISSION LINES, OPTICAL CORRELATORS, INTEGRATION, INTERFERENCE, ADAPTIVE SYSTEMS, CONVERGENCE, NULLS(AMPLITUDE), RADAR ANTENNAS, OPTICAL PROCESSING, BEAM STEERING, MULTIPATH TRANSMISSION, PHASED ARRAYS, C BAND, MULTICHANNEL, BRAGG ANGLE, ELECTRIC FILTERS, ACOUSTIC DELAY LINES.

Subject Categories : Acoustooptic and Optoacoustic Devices
      Radar Countermeasures

Distribution Statement : APPROVED FOR PUBLIC RELEASE