The Journal of Korean Institute of Information Technology (한국정보기술학회논문지)

Korean Institute of Information Technology (한국정보기술학회)
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Human Detection and Ranging System Using IR-UWB Radar

IR-UWB를 활용한 인체 탐지 및 거리 측정시스템

  • 김하준 (조선대학교 정보통신공학과) ;
  • 박준범 (정보통신기술진흥센터) ;
  • 변재영 (조선대학교 정보통신공학과)
  • Received : 2015.02.26
  • Accepted : 2015.05.23
  • Published : 2015.05.31
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Abstract

Nowadays, people spend most of their lives indoor. The existing positioning systems such as global positioning system (GPS) and conventional Radar are restricted at the indoor applications because of their high errors. In recent years, the Ultrawide band (UWB) has become a possible solution for object detection and ranging because it has many advantages such as high spatial resolution, simple transceiver, and low cost. This paper shows a real time human detection and distance measurement system using impulse radio-ultrawide band (IR-UWB) radar. First, the IR-UWB signal is applied for clutter reduction to reduce unwanted signals. After that, the cell averaging constant false alarm rate (CA-CFAR) is used for detection of objects. Finally, the object distance is computed based on time of arrival (TOA). In order to evaluate the performance of proposed method, experiments are made with real IR-UWB test equipment. The experimental results validate that the implemented IR-UWB tracking system finds the moving human with tolerable ranging errors of 30cm in 6m distance.

오늘날, 사람들은 실내에서 생활의 대부분을 보낸다. 예컨대 위성 위치 확인 시스템, 레이더 등 전통적인 기존의 측위 시스템은 실내에서 높은 오류로 사용이 제한된다. 최근 Ultrawide band(UWB)는 물체 감지를 위해 높은 공간 해상도, 간단 송수신기, 저비용 등의 많은 장점을 가지고 있기 때문에 물체 감지 및 거리 측정을 위한 해결책으로 제시된다. 본 논문에서는 임펄스 라디오 초광대역 레이더를 이용하여 실시간 인체 탐지 및 거리 측정 시스템을 제안한다. 첫째, IR-UWB 신호는 불필요한 신호를 감소시키기 위해 클러터 감소를 적용한다. 그 후, CA-CFAR방법이 객체의 검출을 위해 사용된다. 마지막으로, 물체 거리는 레이더 신호의 실제 도착 시간에 따라 계산된다. 제안 된 방법의 성능을 평가하기 위해 실험은 IR-UWB 시험 장비로 실시하였다. 실험 결과에서는 구현된 IR-UWB 추적 시스템이 6m 거리에서 30cm 허용 범위 내의 오차로 이동하는 사람을 찾아내는 것을 확인하였다.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea(NRF)

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