Indoor Tracking and Localization of non-authorized Cellphones in Prisons Using Uplink Signals

Schmidt, A.; Müller, L.; Grossniklaus, B.; Vetter, R.; Schwab, P.; Dellsperger, F. (2019). Indoor Tracking and Localization of non-authorized Cellphones in Prisons Using Uplink Signals In: 2019 International Conference on Indoor Positioning and Indoor Navigation (IPIN) (pp. 1-6). IEEE 10.1109/IPIN.2019.8911752

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In prisons, cellphones are often used by inmates to communicate with the outside world creating a serious problem for public safety. We developed a system for indoor localization of non-authorized active cellphones operating in the 2G, 3G or 4G communication standards. The system is based on a fingerprinting technique of signals from 12 antennas covering the building under surveillance. The fingerprints were extracted from antenna signals using Welch’s classical short-term PSD estimator. To obtain relevant fingerprints background noise reduction was performed through spectral subtraction and separation of signals from different cellphones was achieved by k-means clustering. The resulting cellphone specific signals strengths provided relevant fingerprints for a final classification by the Mahalanobis distance. The validation performed in a four-story prison building with over 100 localization cells showed high performance yielding a localization error smaller than 1.8m for the 2G, 3G and 4G communication standards in 70% of all measurements.

Item Type:	Conference or Workshop Item (Paper)
Division/Institute:	School of Engineering and Computer Science > Institut für Optimierung und Datenanalyse IODA School of Engineering and Computer Science
Name:	Schmidt, A.; Müller, L.; Grossniklaus, B.; Vetter, R.; Schwab, P. and Dellsperger, F.
ISBN:	978-1-7281-1788-1
Publisher:	IEEE
Language:	English
Submitter:	Rolf Vetter
Date Deposited:	09 Dec 2019 16:06
Last Modified:	29 Jan 2020 11:48
Publisher DOI:	10.1109/IPIN.2019.8911752
ARBOR DOI:	10.24451/arbor.9347
URI:	https://arbor.bfh.ch/id/eprint/9347