Study of interference effects on GPS signal acquisition

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dc.contributor.advisorCannon, M. Elizabeth
dc.contributor.authorDeshpande, Sameet Mangesh
dc.date.accessioned2005-08-16T16:55:30Z
dc.date.available2005-08-16T16:55:30Z
dc.date.issued2004
dc.descriptionBibliography: p. 193-204en
dc.description.abstractInterference and jamming is one of the major concerns in using the Global Positioning System (GPS) for critical applications. The GPS system has advantages over the narrow-band navigation systems since GPS signals are spread-spectrum signals and receiver design techniques can eliminate most of the interference signals. Any signal or its harmonics near the GPS L1 and L2 frequencies are a potential source of interference. The interference signals outside GPS frequency band can be filtered out either by a GPS antenna or a receiver front-end. Interference signals within the GPS frequency bandwidth are difficult to isolate using the filters. These signals need to be mitigated either by the acquisition process or the tracking process. This thesis investigates possible interference mitigation by the acquisition process. Acquisition methods were implemented as a part of the correlator in a software receiver and used for analysis. Interference resulting from sampling in the receiver front-end and cross-correlation between the GPS Gold codes were studied. Aliasing effect introduces a loss of 2-3 dB in the acquisition gain and causes false locks for smaller sampling frequencies at a wider precorrelation bandwidth. The cross-correlation between the GPS Gold codes causes problems for the signal acquisition below -135 dBm. Different radio frequency (RF) interference signals were studied to analyze their effect on the acquisition process. Adaptive predetection integration (up to 100 ms) was performed to determine the possible tolerance to the RF interference signals. A continuous wave (CW) interference hinders the acquisition more compared to any other RF signals such as swept CW, amplitude modulated (AM), frequency modulated (FM) or broadband noise. An RF signal level of 15-25 dB above the GPS signal level was found sufficient to jam the acquisition process.en
dc.format.extentxiv, 204 leaves : ill. ; 30 cm.en
dc.identifier.citationDeshpande, S. M. (2004). Study of interference effects on GPS signal acquisition (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/17566en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/17566
dc.identifier.isbn0612975304en
dc.identifier.lccAC1 .T484 2004 D47en
dc.identifier.urihttp://hdl.handle.net/1880/41453
dc.language.isoeng
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.titleStudy of interference effects on GPS signal acquisition
dc.typemaster thesis
thesis.degree.disciplineGeomatics Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 1497 520492014
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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