Introduction of MAP estimation to UWB-IR TOA localization

This paper proposes a new method based on the combination of a soft-decision ranging and Maximum A Posteriori (MAP) estimation for Impulse Radio type Ultra Wide Band (UWB-IR) Time of Arrival (TOA) localization. The soft-decision ranging assigns the probability of being generated by a signal to each component in the observed instantaneous power delay profile (the probability density function (pdf) of the first arrival signal) and the MAP estimation calculates the location of a target node which maximizes the product of the pdfs obtained for different anchor nodes. Computer simulation results show that, as compared with a conventional localization method, the proposed method is advantageous in typical mixed Line-Of-Sight (LOS)/Non Line-Of-Sight (NLOS) indoor environments.