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In this paper, the authors propose and investigate a low-complexity human motion tracking system which is based on Ultra-WideBand (UWB) radio nodes. The Maximum Likelihood (ML) solution of the localization problem that arises in such a system has been presented in. However, the ML solution has a computational complexity that prohibits cost-effective real-time human motion tracking. In this paper, an iterative solution of the localization problem, which is based on the first order Taylor Series (TS) approximation of the ranges between the anchors and the agents, is presented. The localization algorithm can handle range measurements with unknown offsets which arise due to the asynchronism between the clock of the agents and the anchors.
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