A Study of Positioning Using UWB Reflected Waves in a Non-Line-Of Sight (NLOS) Environment

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A positioning method that utilizes UWB reflected waves is prposed. This method realizes accurate positioning with few base stations (BSs) (one BS at minimum). NLOS positioning is possible if more than three reflected waves can be received at the BS. The proposed method was verified by fundamental 2 dimensional experiments, and the estimation errors were evaluated theoretically and by computer simulation. TOA and TDOA schemes were adopted for the positioning.The reflected waves from existing obstacles (walls, ceilings, racks, etc.) were considered first. The reflected waves from precisely designed reflectors were considered next. Accurate positioning is possible in almost all area with designed reflectos.