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Source Localization in the non-synchronous mobile system is a very important issue since it only requires synchronized clocks between the based stations (BSs) and can reduce system complexity. There are time-difference-of-arrival (TDOA) and pseudo-range time-of-arrival (TOA) based localization techniques for a non-synchronous mobile system. Although many methods and performance analysis have been proposed for TDOA technique, relatively few studies have been reported on pseudo-range TOA method. This paper proposes a novel localization algorithm based on minimum mean square error estimator (MMSEE) for pseudo-range TOA. The simulations show that the proposed method can reach its CRLB and has the better performance than the TDOA method based on maximum likelihood estimator (MLE).

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