On best linear unbiased estimator approach for time-of-arrival based localization

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • F.K.W. Chan
  • H.C. So
  • J. Zheng
  • Wing Kin LUI

Detail(s)

Original languageEnglish
Pages (from-to)156 - 162
Journal / PublicationIET Signal Processing
Volume2
Issue number2
Publication statusPublished - 1 Jun 2008

Abstract

A common technique for source localisation is to utilise the time-of-arrival (TOA) measurements between the source and several spatially separated sensors. The TOA information defines a set of circular equations from which the source position can be calculated with the knowledge of the sensor positions. Apart from nonlinear optimisation, least squares calibration (LSC) and linear least squares (LLS) are two computationally simple positioning alternatives which reorganise the circular equations into a unique and nonunique set of linear equations, respectively. As the LSC and LLS algorithms employ standard least squares (LS), an obvious improvement is to utilise weighted LS estimation. In the paper, it is proved that the best linear unbiased estimator (BLUE) version of the LLS algorithm will give identical estimation performance as long as the linear equations correspond to the independent set. The equivalence of the BLUE-LLS approach and the BLUE variant of the LSC method is analysed. Simulation results are also included to show the comparative performance of the BLUE-LSC, BLUE-LLS, LSC, LLS and constrained weighted LSC methods with Crame´r–Rao lower bound.

Citation Format(s)

On best linear unbiased estimator approach for time-of-arrival based localization. / Chan, F.K.W.; So, H.C.; Zheng, J. et al.
In: IET Signal Processing, Vol. 2, No. 2, 01.06.2008, p. 156 - 162.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review