Time-of-arrival based localization under NLOS conditions

@article{Chan2006TimeofarrivalBL,
  title={Time-of-arrival based localization under NLOS conditions},
  author={Y. Chan and Wing-Yue Tsui and H. So and P. Ching},
  journal={IEEE Transactions on Vehicular Technology},
  year={2006},
  volume={55},
  pages={17-24}
}
Three or more base stations (BS) making time-of-arrival measurements of a signal from a mobile station (MS) can locate the MS. However, when some of the measurements are from non-line-of-sight (NLOS) paths, the location errors can be very large. This paper proposes a residual test (RT) that can simultaneously determine the number of line-of-sight (LOS) BS and identify them. Then, localization can proceed with only those LOS BS. The RT works on the principle that when all measurements are LOS… Expand
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424 Citations

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A novel NLOS mitigation scheme is proposed, in which the geometric relationship between a base station and a mobile station is used, which makes it possible to identify range measurements corrupted by NLOS errors, and the mobile station can then estimate its position through line-of-sight (LOS) measurements. Expand
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A method is proposed that takes into account possible large RTT error measurements caused by NLoS and measures the best coherence between the RTT estimates and allows the mobile to select the three most reliable measures among the whole available RTT measurements. Expand
Constrained Least Squares Algorithm for TOA-Based Mobile Location under NLOS Environments
  • W. Ke, Lenan Wu
  • Computer Science
  • 2009 5th International Conference on Wireless Communications, Networking and Mobile Computing
  • 2009
TLDR
A novel least-square (LS) approach combining with geometrical relationship is proposed, which adjusts the NLOS-corrupted range measurements to approach their LOS values, and then minimizes a constrained least- squares function incorporating the known relation between the intermediate variable and the position coordinate, based on the technique of Lagrange multipliers. Expand
Non-Line-of-Sight Localization in
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It is found that the proposed method can deal with NLOS error effectively, and it is attractive for location estimation in cellular networks. Expand
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A novel mobile localization algorithm under non-line-of-sight (NLoS) conditions involving at most two base stations (BS) and outperforms previous methods by providing an accuracy enhancement that reaches 60%. Expand
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It is shown that, under certain conditions, the system that localizes with all BSs (including both LOS and NLOS) can benefit from error cancellation, and may perform better than theSystem that implements “pure” classification. Expand
LCRT: A ToA Based Mobile Terminal Localization Algorithm in NLOS Environment
  • Lei Jiao, F. Li, Zengyou Xu
  • Mathematics, Computer Science
  • VTC Spring 2009 - IEEE 69th Vehicular Technology Conference
  • 2009
TLDR
Simulation results show that the LCRT can efficiently identify the set of LOS and the correct decision rate is higher than 92% and the variances of results are approaching to the Cramer-Rao Lower Bound (CRLB) when there are more than 3 LOS propagations. Expand
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