Opportunistic indoor localization and navigation using wireless LAN (802.11 a/g) signals

Xu Huilin, Yang Liuqing

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Global Positioning System (GPS) has been the main method for wireless localization and navigation. However, its application is constrained when the GPS signals is unavailable in indoor, metropolitan and heavy-foliage scenarios. Therefore, we need to exploit the terrestrial wireless signal for positioning and navigation. In Hhis paper, we apply the wireless local area network (WLAN) IEEE 802.11a/g signals for time-difference-of-arrival (TDoA) based ranging and localization. We propose a simple model-based time-of-arrival (ToA) estimation approach. In this approach, the channel impulse response (CIR) is recovered with a simple equally-spaced model. Then, the delay of channel path is estimated by minimizing the energy leakage from the first path. Compared with the widely adopted space alternating generalized expectation maximization (SAGE) algorithm, the model-based approach has the advantage of lower complexity. Simulation results show that the model-based approach can achieve similar performance as the SAGE algorithm. Based on this ToA estimator, we realize the TDoA-based and TDoA-Doppler hybrid localization algorithms. Simulations are also carried out to corroborate our theoretical analysis.

Original languageEnglish (US)
Title of host publication20th International Technical Meeting of the Satellite Division of The Institute of Navigation 2007, ION GNSS 2007
Pages1839-1844
Number of pages6
StatePublished - 2007
Externally publishedYes
Event20th International Technical Meeting of the Satellite Division of The Institute of Navigation 2007 ION GNSS 2007 - Fort Worth, TX, United States
Duration: Sep 25 2007Sep 28 2007

Publication series

Name20th International Technical Meeting of the Satellite Division of The Institute of Navigation 2007 ION GNSS 2007
Volume5

Conference

Conference20th International Technical Meeting of the Satellite Division of The Institute of Navigation 2007 ION GNSS 2007
CountryUnited States
CityFort Worth, TX
Period9/25/079/28/07

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