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chapter
This paper proposes a novel singular-value decomposition based algorithm that can be used in source localization and time synchronization using the time of arrival and/or the time difference of arrival measurements. The algorithm performance has been investigated in an autonomous underwater vehicle operating environment. Through extensive simulations the superiority of the algorithm has been demonstrated...
chapter
We propose a fully distributed algorithm for source localization based on TOA measurements in a multi-hop wireless sensor networks. In contrast to centralized methods where all measurements are transmitted to and processed at a central location (the sink), the proposed method distributes the processing among the relay nodes on the routes to the sink such that the raw and intermediate data are progressively...
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An optimal positioning algorithm based on polynomial fitting technique for non-line-of-sight (NLOS) environment is presented. First, NLOS errors in TOA measurements are mitigated using an orthogonal polynomial fitting technique. Then the standard deviation of LOS error is exploited to give an optimal location estimation of the mobile station (MS). Performance measure for location accuracy is calculated...
article
IEEE Journal on Selected Areas in Communications > 2010 > 28 > 7 > 1017 - 1025
Joint synchronization and localization using time of arrival (TOA) measurements is a very important research topic for many wireless ad hoc sensor network applications. For such TOA based joint synchronization and localization, the least square (LS) criterion and its corresponding solution have been shown to exhibit optimum estimation performance but generally at a very high computational complexity...
article
IEEE Transactions on Signal Processing > 2008 > 56 > 8-1 > 3779 - 3783
Underwater acoustic localization usually relies on time-of-arrival (ToA) measurements, which are then converted into range estimates. However, the water medium is inhomogeneous and the sound speed varies depending on several parameters, e.g., the temperature, pressure and salinity. As a result, sound waves do not necessarily travel in straight lines. Ignoring this stratification effect could lead...
chapter
Accurate position determination is essential for location-aware wireless networks. Time-of-arrival (ToA) and angle-of-arrival (AoA) are two of the most commonly used relative measurements for localizing nodes with unknown positions. In this paper, we consider a localization problem using wideband antenna arrays, which can provide both ToA and AoA information. Since orientation of the array may be...
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This paper describes an effective method for mobile location tracking and velocity estimation in a network-based wireless localization system. We propose a constrained least squares estimation algorithm for real-time tracking of the location and dynamic motion of a mobile user using TOA measurements. The tracking problem is formulated in a state-space framework and the constraints on system states...
