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dc.contributor.authorO'Hanlon, Brady Whitson
dc.date.accessioned2017-04-04T20:28:21Z
dc.date.available2017-04-04T20:28:21Z
dc.date.issued2017-01-30
dc.identifier.otherOHanlon_cornellgrad_0058F_10117
dc.identifier.otherhttp://dissertations.umi.com/cornellgrad:10117
dc.identifier.otherbibid: 9906120
dc.identifier.urihttps://hdl.handle.net/1813/47873
dc.description.abstractIn the interest of producing a GPS receiver uniquely suited to ionospheric study, a software-defined receiver was built: the Connected Autonomous Space Environment Sensor (CASES). This receiver was designed to be inexpensive, easy to modify via software changes, and capable of producing measurements both useful to and understandable by ionospheric scientists. The design and features of this receiver, both the software and the custom-designed hardware upon which it runs are described in detail. In the course of using this receiver to study variations in Total Electron Content (TEC), it was discovered that the phase of the carrier signal from one particular satellite was behaving in a manner not described by the civilian GPS interface specification. Specifically, the carrier was exhibiting aperiodic step changes on the order of 10 degrees. These newly discovered phase anomalies are discussed. The open nature of civilian GPS signals makes those signals vulnerable to spoofing, the transmission of signals intended to appear as legitimate GPS signals for the purpose of deceiving users of those signals. One defense against GPS signal spoofing involves making use of the unknown but presumably secure (and thus un-spoofable) P(Y) code. To demonstrate this method in real-time, the aforementioned software-defined GPS receiver CASES was modified to implement this method. The details of this implementation and experimental results therefrom are described.
dc.language.isoen_US
dc.subjectspoofing
dc.subjecttec
dc.subjectElectrical engineering
dc.subjectdetection
dc.subjectGPS
dc.subjectscintillation
dc.subjectsdr
dc.titleSignal Processing and the Global Positioning System: Three Applications
dc.typedissertation or thesis
thesis.degree.disciplineElectrical and Computer Engineering
thesis.degree.grantorCornell University
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Electrical and Computer Engineering
dc.contributor.chairPsiaki, Mark Lockwood
dc.contributor.committeeMemberKelley, Michael Charles
dc.contributor.committeeMemberHysell, David Lee
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/X42B8W04


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