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Lookup NU author(s): Dr Shouhong Zhu, Dr Zhiguo Ding
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This study deals with the localisation of all nodes in a network, also called as network localisation, based on pairwise distance measurements. The case of a fully connected network is considered, where 'fully connected' refers to that within the whole network every pair of nodes directly connect to each other, thus their pairwise distance can be measured and available. For the localisation of such a network, the multi-dimensional scaling (MDS) algorithm can provide a relative localisation solution, but only a coarse solution when there are measurement errors. To bridge the gap in the localisation performance between the MDS-based and optimum network localisation, the authors propose an efficient subsequent refinement, that is, the iterative least square (LS)/weighted least square (WLS) refinement for the widely existing independent zero-mean Gaussian measurement errors. Analysis and simulation study show that with sufficiently small measurement errors the proposed improved network localisation scheme can achieve, in very limited iterations, the LS/WLS solution, which exhibits the localisation performance the same as the Cramer-Rao lower bound. The authors also extend the proposed refinement to the absolute localisation case with sufficient position-known anchors that are fully and directly connected to all sensors of the network.
Author(s): Ding Z; Zhu S
Publication type: Article
Publication status: Published
Journal: IET Signal Processing
Year: 2012
Volume: 6
Issue: 2
Pages: 132-142
Print publication date: 14/05/2012
ISSN (print): 1751-9675
ISSN (electronic): 1751-9683
Publisher: Institution of Engineering and Technology
URL: http://dx.doi.org/10.1049/iet-spr.2010.0352
DOI: 10.1049/iet-spr.2010.0352
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