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Time-based localization for asynchronous wireless sensor networks

Time-based localization for asynchronous wireless sensor networks,10.1109/ICASSP.2011.5946723,Yiyin Wang,Geert Leus,Xiaoli Ma

Time-based localization for asynchronous wireless sensor networks   (Citations: 2)
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In this paper, we propose time-based localization approaches for asynchronous wireless sensor networks (WSNs), where not only clock skews but also clock offsets are present at all nodes. We first propose a joint synchronization and localization approach using the two-way ranging (TWR) protocol. Furthermore, a novel ranging protocol, namely asymmetric trip ranging (ATR), is employed and a two-step joint synchronization and localization approach is developed. As a result, we achieve efficient closed-form least-squares (LS) estimators. We compare these two proposed approaches. Moreover, simulation results corroborate the efficiency of our time-based localization schemes.
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    • ...To solve that problem, the ranging procedure can be repeated several times in order to obtain sufficient observations for making an accurate estimate as in [47]...

    Yiyin Wanget al. Robust Time-Based Localization for Asynchronous Networks

    • ...Consequently, clock synchronizationhas to be taken into account for a localization or a tracking system using TOA or TDOA measurements [2, 3, 5]. In the second step, the ranging measurements are used to track the target position...
    • ...The asymmetric trip ranging (ATR) protocol proposed in [5] is employed here to obtain TOA measurements and facilitate clock offset cancellation...
    • ...To make full use of the broadcast propertyof wireless signals, we employ the ATR protocol proposed in [5] to make all the other anchors listen to the ranging packets and record their timestamps locally, when one anchor and the target node exchange their ranging packets...
    • ...We employ an orthogonal projection P onto the orthogonal complement of 1M similarly as in [5], which is defined as P=IM − 1...

    Yiyin Wanget al. Tracking a mobile node by asynchronous networks

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