Precise Positioning Method for Logistics Tracking Systems Using Personal Handy-Phone System Based on Mahalanobis Distance

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概要

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• Focusing on the Personal Handy-phone System (PHS) positioning service used in physical distribution logistics, a positioning error offset method for improving positioning accuracy is invented. 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. In this study, an error offset method is developed, which learns patterns of positioning results (latitude and longitude) containing errors and the highest signal strength at major logistic points in advance, and matches them with new data measured in actual distribution processes according to the Mahalanobis distance. Then the matching resolution is improved to 1/40 that of the conventional error offset method.

著者

• Hosaka Hiroshi

  Department Of Environmental Studies Graduate School Of Frontier Sciences The University Of Tokyo

• Kawahara Yasuhiro

  Department Of Biochemistry Kobe University School Of Medicine

• Yokoi Naoaki

  Department Of Human And Engineered Environmental Studies Graduate School Of Frontier Sciences The Un

• KAWAHARA Yasuhiro

  Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo

• SAKATA Kenji

  The Location Inc.

• Hosaka Hiroshi

  Department of Applied Chemistry, Faculty of Science, Science University of Tokyo

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