High-accuracy positioning method using public wireless network based on recorded radio propagation characteristics

By focusing on the Personal Handy-phone System (PHS) positioning service used in physical distribution logistics, a method that improves the positioning accuracy is developed. A disadvantage of PHS positioning is that measurement errors caused by the fluctuation of radio waves due to buildings around the terminal are large, ranging from several tens to several hundreds of meters. Therefore, in this study, the proposed method developed estimates in advance the radio intensity distribution of each cell station containing errors and matches them with new data according to the radio propagation map. As a result, the positioning error is reduced to approximately 60% of that of the conventional positioning method.