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      • Department of Electrical and Electronics Engineering
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      A distributed positioning algorithm for cooperative active and passive sensors

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      Author(s)
      Gholami, M.R.
      Gezici, Sinan
      Rydström, M.
      Ström, E.G.
      Date
      2010
      Source Title
      21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
      Publisher
      IEEE
      Pages
      1713 - 1718
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      The problem of positioning a target node is studied for wireless sensor networks with cooperative active and passive sensors. Two-way time-of-arrival and time-difference-of-arrival measurements made by both active and passive nodes are used to estimate the position of the target node. A maximum likelihood estimator (MLE) can be employed to solve the problem. Due to the nonlinear nature of the cost function in the MLE, an iterative search might converge to local minima which often results in large estimation errors. To avoid this drawback, we instead formulate the problem of positioning as finding the intersection of a number of convex sets derived from measurements. To obtain this intersection, we apply the projection onto convex sets approach, which is robust and can be implemented in a distributed manner. Simulations are performed to compare the performance of the MLE and the proposed method. ©2010 IEEE.
      Keywords
      Large estimation errors
      Local minimums
      Maximum likelihood estimator
      Nonlinear nature
      Passive sensor
      Projection onto convex sets
      Target nodes
      Time-difference-of-arrival
      Time-of-arrival
      Wireless sensor
      Blind source separation
      Estimation
      Maximum likelihood estimation
      Problem solving
      Radio communication
      Sensor networks
      Sensor nodes
      Set theory
      Wireless sensor networks
      Permalink
      http://hdl.handle.net/11693/28457
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/PIMRC.2010.5671918
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      • Department of Electrical and Electronics Engineering 3702
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