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    UWB-TOA geolocation techniques in indoor environments

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    013-017_geolocation techniq.pdf (846.5Kb)
    Date
    2006-09
    Author
    Rashid, A. Saeed
    Sabira, Khatun
    Borhanuddin, Mohd. Ali
    Mohd. Khazani, Abdullah
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    Abstract
    Ultra-wideband (UWB) radio is a new carrierless communication scheme using impulses and is a candidate technology for future communication and ranging applications. In this paper, we consider the problem of node localizing in ad-hoc networks, in which positioning algorithm only exploits the high precision ranging capabilities offered by UWB and does not rely on GPS. A Time-of-Arrival (ToA) based ranging scheme using UWB radio link is proposed. In this paper, the problem of ToA estimation in multipath channels, source of estimation error are discussed. Two-way ranging (TWR) scheme was used for network synchronisation. Results show that the accuracy enhancement depends on two principal factors: the strength of multipath components and the variance of non-line-of-sight (NLOS) delays, which it shows that DS-UWB is best suited for ranging, due to its larger bandwidth and its higher frequencies of operation.
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    http://myiem.org.my/content/iem_journal_2006-177.aspx
    http://dspace.unimap.edu.my/123456789/13559
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