Title:
The effects of atmospheric refractivity in near-earth UHF channels

dc.contributor.advisor Durgin, Gregory D.
dc.contributor.author Bhattacharjea, Rajib
dc.contributor.committeeMember Peterson, Andrew F.
dc.contributor.committeeMember Steffes, Paul G.
dc.contributor.committeeMember Smith, Glenn S.
dc.contributor.committeeMember Anderson, Christopher R.
dc.contributor.department Electrical and Computer Engineering
dc.date.accessioned 2015-01-12T20:44:15Z
dc.date.available 2015-01-12T20:44:15Z
dc.date.created 2014-12
dc.date.issued 2014-09-15
dc.date.submitted December 2014
dc.date.updated 2015-01-12T20:44:15Z
dc.description.abstract The design of emergent wireless sensor networks operating near the ground requires channel models that account for previously unconsidered propagation phenomena. Most models used for link planning and radio design of the last century were designed for use in situations where the transmitters were at least tens of meters above the earth surface. However, near the earth surface, the specifics of the ground composition and atmospheric effects have been postulated to play a significant role. This dissertation describes the first set of investigations in this emergent environment. A novel computational electromagnetics model is presented that can calculate electromagnetic fields of a dipole embedded in planar-stratified propagation medium that represents the ground and near-surface atmosphere. It is the first available electromagnetic model to efficiently combine a spectral-domain solution in arbitrary multilayers of lossy-dielectric media with high-order quadrature routines to synthesize the fields of an impressed dipole. For the first time, high-order asymptotic quadrature is used to efficiently obtain solutions at arbitrary ranges from the dipole source. A measurements-based model of the near-ground atmosphere is derived, and results of modeling the atmosphere are used to predict the performance of an ultra-high-frequency radio system operating near the ground surface. Finally, a study is conducted to determine the effects of varying key parameters in the near ground channel, including atmospheric conditions, ground conditions, and frequency. The primary result is that ultra-high-frequency near-earth narrowband channels are largely insensitive to large-scale refractive effects that occur naturally on Earth; however, as the transmitter frequency increases into the super-high-frequency and millimeter wave regimes, refractive effects have significant effects on the radio propagation environment.
dc.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/53002
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Electromagnetics
dc.subject Radio frequency
dc.subject Wireless communications
dc.title The effects of atmospheric refractivity in near-earth UHF channels
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Durgin, Gregory D.
local.contributor.corporatename School of Electrical and Computer Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication c942e59e-2515-4a56-bd7e-a1c73baa4b67
relation.isOrgUnitOfPublication 5b7adef2-447c-4270-b9fc-846bd76f80f2
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
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