Study of TOA Positioning Using UWB Reflected Waves

With the global spread of mobile terminals, positioning technologies have become an important research issue. The recent main challenges in positioning technologies are the non-line-of sight (NLOS) and reflected wave problems. This paper presents a positioning method that utilizes reflected waves in a positive manner. 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 experiments, and the estimation errors were evaluated theoretically and by computer simulation.