Predicting microwave diffraction in the shadows of buildings

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dc.contributor.authorRussell, Thomas A.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:48:03Zen
dc.date.adate2009-10-22en
dc.date.available2014-03-14T21:48:03Zen
dc.date.issued1991en
dc.date.rdate2009-10-22en
dc.date.sdate2009-10-22en
dc.description.abstractDesigners of low-power radio systems for use in urban areas would benefit from the capability for accurate computer-based predictions of signal loss due to shadowing. This thesis is intended to fill a need for prediction methods that exploit a building database and consider the three-dimensional profile of the radio path. Models are presented that allow the application of Fresnel-Kirchoff diffraction theory to arbitrarily oriented buildings of simple shapes. Building location information used by the diffraction models is in a form compatible with a geographic information systems (GIS) database. Diffraction screens are constructed at all building edges, including those of both horizontal and vertical orientations, in order to consider all possible diffractions and to compute field contributions often ignored. Multiple buildings and edges of the same building that introduce multiple successive diffractions are considered with a rigorous, recursive application of the diffraction theory that requires sampling the field distribution in each aperture. Robust and computationally efficient numerical methods are applied to solve the diffraction integrals. The software implementation of these methods is tested with example runs and comparisons with 914 MHz continuous-wave measurements taken on the Virginia Tech campus.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 243 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10222009-125156en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10222009-125156/en
dc.identifier.urihttp://hdl.handle.net/10919/45267en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.R877.pdfen
dc.relation.isformatofOCLC# 25140615en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.R877en
dc.subject.lcshRadio relay systemsen
dc.subject.lcshRadio waves -- Diffractionen
dc.titlePredicting microwave diffraction in the shadows of buildingsen
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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