Accession Number : ADA255823


Title :   Acousto-Optic Applications for Multichannel Adaptive Optical Processor


Descriptive Note : Final technical rept. Feb 1991-Feb 1992


Corporate Author : DYNETICS INC HUNTSVILLE AL


Personal Author(s) : Budge, Merv C ; Bertinato, Robert J ; Zari, Michael C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255823.pdf


Report Date : Jun 1992


Pagination or Media Count : 143


Abstract : This final report describes the design and hardware implementation of an acousto-optic (AO) multichannel adaptive optical processor (MADOP) for application to the cancellation of multipath jamming interference in advanced surveillance radars. The primary objective of this effort was the design and preliminary fabrication of a multichannel adaptive system that can perform cancellation of multiple wide (10 MHz) jamming interference in the presence of multipath. The MADOP system is composed of three primary subsystems. A multichannel time-integrating AO correlator performs a correlation between the residual cancellation error and each of the auxiliary omnidirectional antennas to arrive at updates for each of the adaptive weight functions. A digital interface accepts this update information and generates the appropriate adaptive weight functions for performing auxiliary channel filtering. Finally, a multichannel AO tapped delay line (AOTDL) filter system accepts these weight functions through an AO spatial light modulator (AOSLM) and taps the auxiliary channel inputs to form the estimate of the noise signal in the main receiver channel. This noise signal estimate is then subtracted from the main receiver channel at the system intermediate frequency to form the residual cancellation error for input to the multichannel time AO correlator, thereby closing the adaptive loop. Adaptive processing, acousto-optics, optical signal processing.


Descriptors :   *ACOUSTOOPTICS , FREQUENCY , INPUT , FUNCTIONS , OPTICS , AUXILIARY , PROCESSING , FABRICATION , RADAR , CORRELATION , SIGNALS , RECEIVERS , ERRORS , ANTENNAS , INTERFERENCE , ADAPTIVE SYSTEMS , JAMMING , FILTERS , INTERMEDIATE FREQUENCIES , OMNIDIRECTIONAL , OMNIDIRECTIONAL ANTENNAS , CORRELATORS , MULTICHANNEL , FILTRATION , DELAY LINES , LIGHT MODULATORS , NOISE , CANCELLATION , CHANNELS , MODULATORS


Subject Categories : Acoustooptic and Optoacoustic Devices


Distribution Statement : APPROVED FOR PUBLIC RELEASE