Enhanced Linear Estimator for Mobile Location Using Range Difference Measurements

Qun WAN  Ying-Ning PENG  

IEICE TRANSACTIONS on Communications   Vol.E85-B   No.5   pp.946-950
Publication Date: 2002/05/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Wireless Communications Issue)
mobile location,  enhanced estimator,  spherical interpolation,  Chan's method,  

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A closed-form solution of mobile location can be obtained by minimizing the norm of the error vector of a set of linear equations in spherical interpolation (SI) method. However, it assumes that the intermediate variables are independent though they are related by a quadratic equation. To give an improved position estimate, we use this relationship to help SI method and a new location method is proposed based on the approximate linearization of spherical intersecting constraint. Simulation results for line-of-sight and non-line-of-sight situations show that the proposed method performs significantly better than SI and Chan's method, especially for the cases where large bias and large standard deviation exist in range difference measurements.