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A Study on Improving Accuracy of Subway Location Tracking using WiFi Fingerprinting
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 Title & Authors
A Study on Improving Accuracy of Subway Location Tracking using WiFi Fingerprinting
An, Taeki; Ahn, Chihyung; Nam, Myungwoo; Park, Jinhong; Lee, Youngseok;
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In this study, an WiFi fingerprinting method based on the k-nn algorithm was applied to improve the accuracy of location tracking of a moving train on a platform and evaluate the performance to minimize the estimation error of location tracking. The data related to the position of the moving train are monitored by the control center for trains and used widely for the safety and comfort of passengers. The train location tracking methods based on WiFi installed by telecom companies were evaluated. In this study, a simulator was developed to consider the environments of two cases; in already installed WiFi devices and new installed WiFi devices. The developed simulator can simulate the localized estimation of the position under a variety of conditions, such as the number of WiFi devices, the area of platform and entry velocity of train. To apply location tracking algorithms, a k-nn algorithm and fuzzy k-nn algorithm were applied selectively according to the underlying condition and also four distance measurement algorithms were applied to compare the error of location tracking. In conclusion, the best method to estimate train location tracking is a combination of the k-nn algorithm and Minkoski distance measurement at a 0.5m grid unit and 8 WiFi AP installed.
WiFi based positioning system;Subway platform;k-nn classification;Fingerprint database;Access point;
 Cited by
지하철 역사 내 WSN 환경구축을 위한 고정 전파범위 기반의 효율적인 AP설치에 관한 연구,안태기;안치형;이영석;남명우;

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