Measurement analysis and channel modeling for TOA-based ranging in tunnels
2015 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 14, no 1, 456-467 p.Article in journal (Refereed) Published
A robust and accurate positioning solution is required to increase the safety in GPS-denied environments. Although there is a lot of available research in this area, little has been done for confined environments such as tunnels. Therefore, we organized a measurement campaign in a basement tunnel of Linköping university, in which we obtained ultra-wideband (UWB) complex impulse responses for line-of-sight (LOS), and three non-LOS (NLOS) scenarios. This paper is focused on time-of-arrival (TOA) ranging since this technique can provide the most accurate range estimates, which are required for range-based positioning. We describe the measurement setup and procedure, select the threshold for TOA estimation, analyze the channel propagation parameters obtained from the power delay profile (PDP), and provide statistical model for ranging. According to our results, the rise-time should be used for NLOS identification, and the maximum excess delay should be used for NLOS error mitigation. However, the NLOS condition cannot be perfectly determined, so the distance likelihood has to be represented in a Gaussian mixture form. We also compared these results with measurements from a mine tunnel, and found a similar behavior.
Place, publisher, year, edition, pages
2015. Vol. 14, no 1, 456-467 p.
channel modeling, impulse response, positioning, ranging, time of arrival, Tunnels, ultrawideband, Channel capacity, Maximum likelihood estimation, Range finding, Ultra-wideband (UWB), Channel model, Measurement campaign, NLOS error mitigations, Nlos identifications, Power delay profiles, Statistical modeling, Time of arrival (TOA)
IdentifiersURN: urn:nbn:se:hig:diva-18917DOI: 10.1109/TWC.2014.2350493ISI: 000349675400037ScopusID: 2-s2.0-84921333804OAI: oai:DiVA.org:hig-18917DiVA: diva2:785880
FunderSwedish Foundation for Strategic Research