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Photorefractive Adaptive Antenna Array Processor

$Photorefractive Adaptive Antenna Array Processor$
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Photorefractive Adaptive Antenna Array Processor

$Photorefractive Adaptive Antenna Array Processor$
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Author :
language : en
Publisher:
Release Date : 1993

Photorefractive Adaptive Antenna Array Processor written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.

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.

Adaptive Array Systems

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Author : Ben Allen
language : en
Publisher: John Wiley & Sons
Release Date : 2006-02-03

Adaptive Array Systems written by Ben Allen and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-02-03 with Technology & Engineering categories.

In the last fifty years, extensive studies have been carried out worldwide in the field of adaptive array systems. However, far from being a mature technology with little research left to tackle, there is seemingly unlimited scope to develop the fundamental characteristics and applications of adaptive antennas for future 3G and 4G mobile communications systems, ultra wideband wireless and satellite and navigation systems, and this informative text shows you how! Provides an accessible resource on adaptive array fundamentals as well as coverage of adaptive algorithms and advanced topics Analyses the performance of various wideband beamforming techniques in wideband array processing Comprehensively covers implementation issues related to such elements as circular arrays, channel modelling and transmit beam forming, highlighting the challenges facing a designer during the development phase Supports practical implementation considerations with detailed case studies on wideband arrays, radar, sonar and biomedical imaging, terrestrial wireless systems and satellite communication systems Includes examples and problems throughout to aid understanding Companion website features Solutions Manual, Matlab Programs and Electronic versions of some figures Adaptive Array Systems is essential reading for senior undergraduate and postgraduate students and researchers in the field of adaptive array systems. It will also have instant appeal to engineers and designers in industry engaged in developing and deploying the technology. This volume will also be invaluable to those working in radar, sonar and bio-medical applications.

Adaptive Phased Array Processing Using Photorefractive Volume Holograms

$Adaptive Phased Array Processing Using Photorefractive Volume Holograms$
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Author : Anthony W. Sarto
language : en
Publisher:
Release Date : 1996

Adaptive Phased Array Processing Using Photorefractive Volume Holograms written by Anthony W. Sarto and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Optoelectronic devices categories.

Photorefractive Materials And Their Applications 3

$Photorefractive Materials And Their Applications 3$
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Author : Peter Günter
language : en
Publisher: Springer
Release Date : 2007-08-30

Photorefractive Materials And Their Applications 3 written by Peter Günter and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-08-30 with Science categories.

This is the final volume of a series devoted to photorefractive effects, photorefractive materials and their applications. Since publication of the first two volumes almost 20 years ago, new and often unexpected effects have been discovered. Theoretical models have been developed, known effects can be finally explained and novel applications have been proposed. For this volume, the editors have invited top experts to reflect on the maturity of the field, assessing progress so far, and predicting avenues of future development. In addition, a series of applications of photorefractive nonlinear optics and of optical data storage are presented in several chapters.

Rf Photonics For Array Processing Muri 3rd Year Summary

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Author :
language : en
Publisher:
Release Date : 2001

Rf Photonics For Array Processing Muri 3rd Year Summary written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

This report covers the fourth year of progress of the 1997 MURI on RF Photonics for Antenna Arrays at the University of Colorado, Montana State University, George Mason University, and the University of California Davis. Novel techniques for optical control and processing of the wideband RF and microwave signals encountered in phased array antennas are being developed, guided by research in spatio-temporal adaptive processing algorithms and active quasioptical RF antenna arrays. The primary goal of this research is to develop enabling optical techniques that provide dramatic improvements in antenna array performance over conventional RF, optical, and digital techniques, allowing the efficient processing of large broadband antenna arrays. Coherent modulation and detection is made robust and practical by the use of dynamic holography in photorefractive and optical coherent transient media. This report summarizes the teams management, educational, and outreach activities, as well as technical progress in the 4th year on the constituent projects broadband adaptive optical array processing, spatio-temporal array processing algorithms, coherent-transient true-time delay, photorefractive signal extraction, optical antenna control, and polymer in-line fiber modulators.

Adaptive Arrays

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Author : Edmond Nicolau
language : en
Publisher: Elsevier Publishing Company
Release Date : 1989

Adaptive Arrays written by Edmond Nicolau and has been published by Elsevier Publishing Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Adaptive antennas categories.

Adaptive arrays have many practical applications in engineering. Many research papers and reviews describe various types of adaptive arrays used in radar, sonar, seismic data processing, radionavigation, direction of arrival estimation, detection, and so on. A systematic outline of the field of adaptive arrays is provided in this book, offering a current overview of the large number of original contributions contained in the technical literature. This is the completely revised English version of the original Romanian edition. The 600 or more works consulted have enabled the authors to present topics from the earliest sources up to the latest developments in the field. Although the emphasis is mainly on the practical aspects, also included are design elements, technical and technological considerations, which make the book useful to a wide range of specialists. Besides the conventional adaptive processing techniques, nonconventional approaches are included such as reactively controlled arrays, adaptive arrays with optical processing, arrays used in frequency hopping communications systems, etc. Special attention is paid to recent applications of adaptive arrays, with a complete chapter devoted to superresolution and direction of arrival estimation. The book is self-contained, in that any person with a background in electrical engineering can follow the computations. Simple numerical examples are used throughout to illustrate the topics presented. The work is intended for researchers, designers, practitioners, high school teachers, students and engineers in radiocommunications, radar, electrical engineering, aerospace engineering, and control systems engineering.