Journal of Advanced Navigation Technology (한국항행학회논문지)

The Korean Navigation Institute (한국항행학회)
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Drone Location Tracking with Circular Microphone Array by HMM

HMM에 의한 원형 마이크로폰 어레이 적용 드론 위치 추적

  • Jeong, HyoungChan (Department of Aviation Industry and System Engineering, Inha University) ;
  • Lim, WonHo (Department of Aviation Industry and System Engineering, Inha University) ;
  • Guo, Junfeng (Department of Electronic Engineering, Inha University) ;
  • Ahmad, Isitiaq (Department of Electronic Engineering, Inha University) ;
  • Chang, KyungHi (Department of Electronic Engineering, Inha University)
  • Received : 2020.09.28
  • Accepted : 2020.10.29
  • Published : 2020.10.30
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Abstract

In order to reduce the threat by illegal unmanned aerial vehicles, a tracking system based on sound was implemented. There are three main points to the drone acoustic tracking method. First, it scans the space through variable beam formation to find a sound source and records the sound using a microphone array. Second, it classifies it into a hidden Markov model (HMM) to find out whether the sound source exists or not, and finally, the sound source is In the case of a drone, a sound source recorded and stored as a tracking reference signal based on an adaptive beam pattern is used. The simulation was performed in both the ideal condition without background noise and interference sound and the non-ideal condition with background noise and interference sound, and evaluated the tracking performance of illegal drones. The drone tracking system designed the criteria for determining the presence or absence of a drone according to the improvement of the search distance performance according to the microphone array performance and the degree of sound pattern matching, and reflected in the design of the speech reading circuit.

불법 무인기에 의한 위협을 줄이기 위해, 음향 기반 기법에 의한 추적시스템을 구현하였다. 드론 음향 추적 방식에는 3가지 주요 사항이 있다. 첫째, 가변 빔 형성을 통해 공간을 스캔하여 음원을 찾아 마이크 어레이를 사용하여 소리를 녹음한다. 둘째, 음원의 존재 유·무 여부를 알기 위해 은닉 마르코프 모델(HMM)로 분류한다. 마지막으로 음원이 드론인 경우, 적응형 빔 패턴을 기반의 추적기준 신호로 기록 및 저장된 음원을 사용한다. 시뮬레이션은 배경 노이즈 및 간섭 사운드가 없는 이상적인 상태와 배경 노이즈 및 간섭 사운드가 있는 비이상적인 조건 모두에서 수행되며 불법적인 드론의 추적 성능을 평가하였다. 드론 추적 시스템은 마이크 어레이 성능에 따른 탐색 거리 성능향상 및 음향 패턴 일치 정도에 따른 드론 유무 판정 기준을 설계하여 음성판독 회로설계에 반영하였다.

Keywords

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