Beam scanning offset Casegrain reflector antennas by subreflector movement

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dc.contributor.authorLaPean, James Williamen
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:39:16Zen
dc.date.adate2009-06-30en
dc.date.available2014-03-14T21:39:16Zen
dc.date.issued1993-11-05en
dc.date.rdate2009-06-30en
dc.date.sdate2009-06-30en
dc.description.abstractIn 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 climatalogical 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% beam efficiency or 50 half-power beamwidths while maintaining less than 1 dB of gain loss during scanning.en
dc.description.degreeMaster of Scienceen
dc.format.extentxiv, 204 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06302009-040304en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06302009-040304/en
dc.identifier.urihttp://hdl.handle.net/10919/43483en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1993.L365.pdfen
dc.relation.isformatofOCLC# 29962765en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1993.L365en
dc.subject.lcshAntennas, Reflectoren
dc.subject.lcshBeam opticsen
dc.subject.lcshRemote sensingen
dc.titleBeam scanning offset Casegrain reflector antennas by subreflector movementen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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