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Beam Scanning Offset Cassegrain Reflector Antennas By Subreflector Movement
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723532269 Total Pages :210 pages Book Rating :4.5/5 (322 download)
Book Synopsis Beam Scanning Offset Cassegrain Reflector Antennas by Subreflector Movement by : National Aeronautics and Space Administration (NASA)
Download or read book Beam Scanning Offset Cassegrain Reflector Antennas by Subreflector Movement written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1987 a NASA panel recommended the creation of the Mission to Planet Earth. This mission was intended to apply to remote sensing experience of the space community to earth remote sensing to enhance the understanding of the climatological processes of our planet and to determine if, and to what extent, the hydrological cycle of Earth is being affected by human activity. One of the systems required for the mission was a wide scanning, high gain reflector antenna system for use in radiometric remote sensing from geostationary orbit. This work describes research conducted at Virginia Tech into techniques for beam scanning offset Cassegrain reflector antennas by subreflector translation and rotation. Background material relevant to beam scanning antenna systems and offset Cassegrain reflector antenna system is presented. A test case is developed based on the background material. The test case is beam scanned using two geometrical optics methods of determining the optimum subreflector position for the desired scanned beam direction. Physical optics far-field results are given for the beam scanned systems. The test case system is found to be capable of beam scanning over a range of 35 half-power beamwidths while maintaining a 90 percent beam efficiency or 50 half-power beamwidths while maintaining less than l dB of gain loss during scanning. Lapean, James W., Jr. and Stutzman, Warren L. Unspecified Center NASA-CR-191604, NAS 1.26:191604, SATCOM-93-19 NAG1-859; RTOP 233-01-03-22...
Book Synopsis Beam Scanning Offset Cassegrain Reflector Antennas by Subreflector Movement by :
Download or read book Beam Scanning Offset Cassegrain Reflector Antennas by Subreflector Movement written by and published by . This book was released on 1994 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Beam Scanning Offset Casegrain Reflector Antennas by Subreflector Movement by : James William LaPean
Download or read book Beam Scanning Offset Casegrain Reflector Antennas by Subreflector Movement written by James William LaPean and published by . This book was released on 1993 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Reflector Antennas and Feed Systems Volume I: Theory and Design of Reflectors by : Satish K. Sharma
Download or read book Handbook of Reflector Antennas and Feed Systems Volume I: Theory and Design of Reflectors written by Satish K. Sharma and published by Artech House. This book was released on 2013-07-01 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first truly comprehensive and most up-to-date handbook available on modern reflector antennas and feed sources for diversified space and ground applications. There has never been such an all-encompassing reflector handbook in print, and no currently available title offers coverage of such recent research developments. The Handbook consists of three volumes. Volume I provides a unique combination of theoretical underpinnings with design considerations and techniques. The need for knowledge in reflector antennas has grown steadily over the last two decades due to increased use in space and ground applications, as well as their high gain and wide bandwidth capabilities at relatively low cost. This volume brings you to the leading edge of developments in the field related to numerical techniques, classical reflector geometries, adaptive reflector antennas, shaped reflectors, bifocal and bicollimated dual reflectors, advanced reflectors, and reflect arrays. A must-have reference for both practicing engineers as well as academic researchers.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Double-spherical Cassegrain Reflector Geometric Optical Solution by : Akira Ishimaru
Download or read book Double-spherical Cassegrain Reflector Geometric Optical Solution written by Akira Ishimaru and published by . This book was released on 1971 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a need for high gain antennas which are capable of rapid scanning and multibeam operations. The report presents a study of double-spherical Cassegrain reflector to ascertain whether this antenna is practical for these purposes. The aperture blocking, the spread of the field, and the phase and amplitude distributions are examined using geometric optical technique There is no single optimum condition, but it is shown that a proper combination of the subreflector and main reflector sizes and the position of the feed can indeed produce a promising antenna. (Author).
Book Synopsis Reflector Feeds for Large Adaptive Reflector Antennas by :
Download or read book Reflector Feeds for Large Adaptive Reflector Antennas written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Reflector Antennas and Feed Systems Volume III: Applications of Reflectors by : Sudhakar Rao
Download or read book Handbook of Reflector Antennas and Feed Systems Volume III: Applications of Reflectors written by Sudhakar Rao and published by Artech House. This book was released on 2013-06-01 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first truly comprehensive and most up-to-date handbook available on modern reflector antennas and feed sources for diversified space and ground applications. There has never been such an all-encompassing reflector handbook in print, and no currently available title offers coverage of such recent research developments. The Handbook consists of three volumes. Volume III focuses on the range of reflector antenna applications, including space, terrestrial, and radar. The intent of this book volume is to provide practical applications and design information on reflector antennas used for several communications systems. This book covers recent developments of reflector antennas used for satellite communications, terrestrial communications, and remote sensing applications. New subjects are introduced for the first time, including satellite antennas, Terahertz antennas, PIM, multipaction, corona, deployable mesh reflector antennas, and mechanical aspects of reflector antennas. In addition, this book contains a separate topic on integrated feed assembly for reflector antennas covering analysis, design, fabrication, and test.
Book Synopsis A Comparison of Reflector Antenna Designs for Wide-angle Scanning by :
Download or read book A Comparison of Reflector Antenna Designs for Wide-angle Scanning written by and published by . This book was released on 1989 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Theory of Reflector Antennas by : Carlyle J. Sletten
Download or read book The Theory of Reflector Antennas written by Carlyle J. Sletten and published by . This book was released on 1966 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722081959 Total Pages :48 pages Book Rating :4.0/5 (819 download)
Book Synopsis Analysis of a Generalized Dual Reflector Antenna System Using Physical Optics by : National Aeronautics and Space Administration (NASA)
Download or read book Analysis of a Generalized Dual Reflector Antenna System Using Physical Optics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflector antennas are widely used in communication satellite systems because they provide high gain at low cost. Offset-fed single paraboloids and dual reflector offset Cassegrain and Gregorian antennas with multiple focal region feeds provide a simple, blockage-free means of forming multiple, shaped, and isolated beams with low sidelobes. Such antennas are applicable to communications satellite frequency reuse systems and earth stations requiring access to several satellites. While the single offset paraboloid has been the most extensively used configuration for the satellite multiple-beam antenna, the trend toward large apertures requiring minimum scanned beam degradation over the field of view 18 degrees for full earth coverage from geostationary orbit may lead to impractically long focal length and large feed arrays. Dual reflector antennas offer packaging advantages and more degrees of design freedom to improve beam scanning and cross-polarization properties. The Cassegrain and Gregorian antennas are the most commonly used dual reflector antennas. A computer program for calculating the secondary pattern and directivity of a generalized dual reflector antenna system was developed and implemented at LeRC. The theoretical foundation for this program is based on the use of physical optics methodology for describing the induced currents on the sub-reflector and main reflector. The resulting induced currents on the main reflector are integrated to obtain the antenna far-zone electric fields. The computer program is verified with other physical optics programs and with measured antenna patterns. The comparison shows good agreement in far-field sidelobe reproduction and directivity. Acosta, Roberto J. and Lagin, Alan R. Glenn Research Center RTOP 679-40-00...
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1995 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1995 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principles of Modern Radar by : Jerry Eaves
Download or read book Principles of Modern Radar written by Jerry Eaves and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 709 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, Principles of Modern Radar, has as its genesis a Georgia Tech short course of the same title. This short course has been presented an nually at Georgia Tech since 1969, and a very comprehensive set of course notes has evolved during that seventeen year period. The 1986 edition of these notes ran to 22 chapters, and all of the authors involved, except Mr. Barrett, were full time members of the Georgia Tech research faculty. After considerable encouragement from various persons at the university and within the radar community, we undertook the task of editing the course notes for formal publication. The contents of the book that ensued tend to be practical in nature, since each contributing author is a practicing engineer or scientist and each was selected to write on a topic embraced by his area(s) of expertise. Prime examples are Chaps. 2, 5, and 10, which were authored by E. F. Knott, G. W. Ewell, and N. C. Currie, respectively. Each of these three researchers is rec ognized in the radar community as an expert in the technical area that his chap ter addresses, and each had already authored and published a major book on his subject. Several other contributing authors, including Dr. Bodnar, Mr. Bruder, Mr. Corriher, Dr. Reedy, Dr. Trebits, and Mr. Scheer, also have major book publications to their credit.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA Langley Scientific and Technical Information Output: 1994, Volume 1 by :
Download or read book NASA Langley Scientific and Technical Information Output: 1994, Volume 1 written by and published by . This book was released on 1995 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA Technical Memorandum by : United States. National Aeronautics and Space Administration
Download or read book NASA Technical Memorandum written by United States. National Aeronautics and Space Administration and published by . This book was released on 1975 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:
