New GNSS Navigation Messages for Inherent Fast TTFF and High Sensitivity - Underlying Theory Study and System Analysis

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dc.contributor.advisorGao, Yang
dc.contributor.authorZhang, Wentao
dc.contributor.committeememberEl-Badry, Mamdouh
dc.contributor.committeememberChen, Ruizhi
dc.contributor.committeememberEl-Sheimy, Naser
dc.contributor.committeememberO'Keefe, Kyle P. G.
dc.date2018-06
dc.date.accessioned2018-05-10T17:45:31Z
dc.date.available2018-05-10T17:45:31Z
dc.date.issued2018-05-08
dc.description.abstractIn the navigation applications on mobile devices, the extreme demands for fast Time To First position Fix (TTFF) and high sensitivity have been driving the technology innovations in these areas in recent years. Assisted GNSS (AGNSS) and Ephemeris Extension (EE) technologies constitute the efforts to improve the TTFF and sensitivity. However, it is challenging for both AGNSS and EE. For AGNSS, while it attempts to improve TTFF on sensitivity on mobile devices, it is subject to frequent ephemeris expiration and therefore it requires the mobile devices to be always or frequently connected to the assisting networks. For EE - a technology complementary to the AGNSS to improve TTFF, although it requires little connectivity to assisting networks by directly using some extended ephemerides (valid for days) in the first position fix, such extended ephemerides can be hardly used as the aiding data for tracking weak signals. In the analysis of the challenges, this thesis points out that, such challenges are originated from the weakness in the fundamental design of the existing GNSSs – the life expectancy of ephemeris is too short. Then this thesis proposes an alternative solution for future GNSSs, to fundamentally resolve the above issues by broadcasting some new navigation (NAV) messages with validity for up to 24 hours instead of those used by current GNSSs. Through the study of the TTFF and sensitivity fundamentals, this thesis fully explains how the ephemeris life expectancy relates to TTFF and sensitivity; and through fundamental study on orbital determination theories and ephemeris extension practices, this thesis confirms the feasibility to obtain long-validity ephemerides; and through some simulated uses of the long-validity ephemerides in some typical scenarios, this thesis further confirms the navigation availability and accuracy using the proposed new NAV messages are comparable to those using the current NAV messages. Therefore, for a GNSS that deploys the proposed NAV messages, the capability to achieve fast TTFF and high sensitivity on a mobile device is inherently enhanced, with minimum or even no reliance on assisting infrastructures.en_US
dc.identifier.citationZhang, W.. (2018). New GNSS Navigation Messages for Inherent Fast TTFF and High Sensitivity - Underlying Theory Study and System Analysis (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/31910en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/31910
dc.identifier.urihttp://hdl.handle.net/1880/106628
dc.language.isoeng
dc.publisher.facultyGraduate Studies
dc.publisher.facultySchulich School of Engineering
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectGNSS
dc.subjectNavigation messages
dc.subjectTime To First Fix
dc.subjectTTFF
dc.subjectSensitivity
dc.subjectEphemeris Extension
dc.subject.classificationEducation--Mathematicsen_US
dc.subject.classificationGeographyen_US
dc.subject.classificationEngineeringen_US
dc.subject.classificationEngineering--Aerospaceen_US
dc.subject.classificationEngineering--Electronics and Electricalen_US
dc.titleNew GNSS Navigation Messages for Inherent Fast TTFF and High Sensitivity - Underlying Theory Study and System Analysis
dc.typedoctoral thesis
thesis.degree.disciplineGeomatics Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
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