Institutional Repository
Technical University of Crete
Technical University of Crete
EN
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EL
| URI | http://purl.tuc.gr/dl/dias/487946C5-20BE-4E75-A6CE-93053F68568D | - |
| Identifier | https://doi.org/10.26233/heallink.tuc.90594 | - |
| Language | en | - |
| Extent | 69 pages | en |
| Extent | 7.3 megabytes | en |
| Title | Indoor RF localization with algebraic methods | en |
| Title | Ραδιοσυχνοτικός προσδιορισμός θέσης σε εσωτερικούς χώρους με αλγεβρικές μεθόδους | el |
| Creator | Peppas Spyridon | en |
| Creator | Πεππας Σπυριδων | el |
| Contributor [Thesis Supervisor] | Bletsas Aggelos | en |
| Contributor [Thesis Supervisor] | Μπλετσας Αγγελος | el |
| Contributor [Committee Member] | Karystinos Georgios | en |
| Contributor [Committee Member] | Καρυστινος Γεωργιος | el |
| Contributor [Committee Member] | Lagoudakis Michail | en |
| Contributor [Committee Member] | Λαγουδακης Μιχαηλ | el |
| Publisher | Πολυτεχνείο Κρήτης | el |
| Publisher | Technical University of Crete | en |
| Academic Unit | Technical University of Crete::School of Electrical and Computer Engineering | en |
| Academic Unit | Πολυτεχνείο Κρήτης::Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών | el |
| Content Summary | This work investigates the problem of localizing batteryless, passive, ultra-low cost RFID tags, under the presence of non-white noise that multipath introduces inside buildings. Two recently proposed grid-based methods are utilized to tackle the aforementioned problem with radio signals. The first method is borrowed from the through-the-wall radar imaging community and this thesis adapts it to the case of monostatic interrogation of Gen2 tags, with commercial RFID readers. The method exploits the strength of the received signal (RSSI) and its phase, expressed in a linear system that incorporates the impact of known reflectors. The second one is a phase-based method, which puts forth a ”differential mitigation” scheme based on maximum likelihood estimation (MLE). For the first method, it is found that certain ambiguities need to be resolved, relevant to the wavelength, which can be mitigated based on the fundamental theory of compressive sensing. Specifically, it is observed that the so-called sensing matrix, can lead to a successful reconstruction by properly selecting the carrier frequency or spreading the measurements, with respect to the coherence of its columns or its blocks. As for the second method, a selection of a phase measurement is needed; it is found that if more than one phase measurements are randomly selected, then a more accurate estimate of the target is achieved. According to simulations, the random selection of a subset of the phase measurements as a reference can provide up to 50% improvement, concerning root mean squared error. This thesis includes both simulation and experimental results using a commercial Gen2 RFID reader at UHF, installed on a robotic platform. Experimental results with the available equipment show that, given static poles, mean absolute localization error in the order of 10 cm for indoor 2D localization is achieved. On the other hand, when the RFID reader is placed on a mobile robotic platform, it is shown that mean absolute localization error in the order of 19cm is possible. Finally, a proof-of-concept is offered, by the modeling of a single reflector, which leads to about 19% 3D localization error improvement, compared to the case where the reflector is ignored. Further examination of this finding perhaps opens a fruitful new research direction. | en |
| Type of Item | Διπλωματική Εργασία | el |
| Type of Item | Diploma Work | en |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2021-10-15 | - |
| Date of Publication | 2021 | - |
| Subject | RFID | en |
| Subject | Backscatter | en |
| Subject | Compressive sensing | en |
| Subject | Localization | en |
| Bibliographic Citation | Spyridon Peppas, "Indoor RF localization with algebraic methods", Diploma Work, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2021 | en |
| Bibliographic Citation | Σπυρίδων Πέππας, "Ραδιοσυχνοτικός προσδιορισμός θέσης σε εσωτερικούς χώρους με αλγεβρικές μεθόδους", Διπλωματική Εργασία, Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών, Πολυτεχνείο Κρήτης, Χανιά, Ελλάς, 2021 | el |
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