Journal of the Korean Society of Mineral and Energy Resources Engineers (한국자원공학회지)

The Korean Society of Mineral and Energy Resources Engineers (한국자원공학회)
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Analysis of Received Signal Strength Index from Bluetooth Beacons to Develop Proximity Warning Systems for Underground Mines

지하광산용 근접경고시스템 개발을 위한 블루투스 비콘 신호의 수신 강도 분석

  • 백지은 (부경대학교 에너지자원공학과) ;
  • 서장원 (강원대학교 에너지공학부 (에너지자원융합공학전공)) ;
  • 최요순 (부경대학교 에너지자원공학과)
  • Received : 2018.12.04
  • Accepted : 2018.12.20
  • Published : 2018.12.31
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Abstract

In this study, we analyzed the variations in the received signal strength index (RSSI) measured from Bluetooth beacons based on the strength and propagation direction of Bluetooth low energy (BLE) signal. Using a smartphone, we performed field experiments to investigate RSSI variations in the BLE signal transmitted by non-directional and directional beacons in an amethyst mine. In case of non-directional beacons, as the distance between the Bluetooth beacon and smartphone decreased, the RSSI increases, whereas as the BLE signal strength increased, the RSSI average gradually increased. The mean value of RSSI measured from the directional beacons was changed without relation to the facing angle between the Bluetooth beacon and smartphone. The results of this study can be used as basic data for developing a Bluetooth beacon-based proximity warning system for underground mines.

본 연구에서는 블루투스 비콘이 송신하는 저전력 블루투스 신호의 세기와 전파 방향성에 따른 수신 강도(Received Signal Strength Index, RSSI) 변화를 분석하였다. 자수정 지하광산에서 스마트폰을 이용하여 저전력 블루투스 신호의 RSSI 변화를 조사한 결과, 무지향성 비콘의 경우 비콘과 스마트폰 사이의 거리가 감소할수록 신호 세기가 증가할수록 RSSI 평균이 점차 증가하였다. 지향성 비콘의 RSSI 평균은 비콘과 스마트폰이 마주 보는 각도와는 연관성 없이 변화하였다. 본 연구의 결과는 블루투스 비콘 기반의 지하광산 근접경고시스템 개발을 위한 기초자료로 활용될 수 있을 것이다.

Keywords

Acknowledgement

Grant : 광물자원 탐사.개발

Supported by : 산업통상자원부

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