Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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An indoor localization approach using RSSI and LQI based on IEEE 802.15.4

IEEE 802.15.4기반 RSSI와 LQI를 이용한 실내 위치추정 기법

  • Kim, Jung-Ha (Department of Electrical & Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kim, Hyun-Jun (Department of Electrical & Electronics Engineering, Korea Maritime and Ocean University) ;
  • Kim, Jong-Su (Division of Marine System Engineering, Korea Maritime and Ocean University) ;
  • Lee, Sung-Geun (Division of Electrical & Electronics Engineering, Korea Maritime and Ocean University) ;
  • Seo, Dong-Hoan (Division of Electrical & Electronics Engineering, Korea Maritime and Ocean University)
  • Received : 2013.12.24
  • Accepted : 2013.12.30
  • Published : 2014.01.31
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Abstract

Recently, Fingerprint approach using RSSI based on WLAN has been many studied in order to construct low-cost indoor localization systems. Because this technique is relatively evaluated non-precise positioning technique compared with the positioning of Ultra-Wide-Band(UWB), the performance of the Fingerprint based on WLAN should be continuously improved to implement various indoor location. Therefore, this paper presents a Fingerprint approach which can improve the performance of localization by using RSSI and LQI contained IEEE 802.15.4 standard. The advantages of these techniques are that the characteristics of each location is created more clearly by utilizing RSSI and LQI and Fingerprint technique is improved by using the modified Euclidean distance method. The experimental results which are applied in NLOS indoor environment with various obstacles show that the accuracy of localization is improved to 22% compared to conventional Fingerprint.

최근 저비용 실내 측위 시스템을 구축하기 위하여 WLAN기반 RSSI를 이용한 핑거프린트 기법이 많이 연구되고 있다. 이 기법은 UWB의 측위와 비교해서 상대적으로 정확도가 떨어지므로 다양한 실내 위치기반 서비스를 구현하기 위하여 지속적으로 WLAN기반 핑거프린트의 측위 성능은 향상되어야 한다. 따라서 본 논문에서는 IEEE 802.15.4 표준에 포함된 RSSI와 LQI를 이용하여 실내 측위 성능을 향상 할 수 있는 핑거프린트 기법을 제안한다. 제안한 기법은 RSSI와 LQI를 활용함으로써 각 위치의 특징을 더욱 뚜렷하게 만들고 변형된 유클리드 거리법을 사용하여 핑거프린트 기법을 개선하였다. 다양한 장애물이 존재하는 NLOS의 실내 환경에서 실험을 진행한 결과 측위 성능이 22% 향상되는 것을 확인하였다.

Keywords

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