Journal of Digital Convergence (디지털융복합연구)

The Society of Digital Policy and Management (한국디지털정책학회)
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Position Fixing Accuracy of TDOA Direction Finding Method

TDOA 방위탐지방식의 위치표정 정확도

  • Lim, Joong-Soo (Division of Information & Communication Eng., Baekseok University/EWRC) ;
  • Chae, Gyoo-Soo (Division of Information & Communication Eng., Baekseok University/EWRC)
  • 임중수 (백석대학교 정보통신학부/전자전특화센터) ;
  • 채규수 (백석대학교 정보통신학부/전자전특화센터)
  • Received : 2014.09.27
  • Accepted : 2014.11.20
  • Published : 2014.11.28
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Abstract

The technology of direction finding is very important to make high position fixing accuracy. TDOA(time difference of arrival) direction finding technology is a high accuracy technology and is used in RF system from 1990. The principle of TDOA is to receive an emitter signal with two antennas, measure the time difference of received signal and then convert the time differences to azimuth angle. For high DF(direction finding) accuracy long basis line and high SNR at receiving system are needed. The DF accuracy and position fixing accuracy are simulated with different SNRs and antenna base lines. We obtain the DF accuracy of $0.51^{\circ}$ at $0^{\circ}$ incident azimuth angle in case of 50m base line and 40dB SNR.

방위탐지기술은 위치표정 정확도를 높이기 위해서 매우 중요하다. 도착시간차(TDOA) 방위탐지 방식은 정확도가 매우 높은 기술이며 1990년대부터 고주파신호 방위탐지에 사용되었다. TDOA 방식은 송신기에서 송신된 신호가 거리가 다른 위치에 있는 두 개의 수신기에 도착하는 시간차를 이용하여 송신기의 방위를 측정하는 방식으로서 수신신호의 신호대잡음비(SNR)와 안테나 기준선이 방위탐지 정확도에 매우 큰 영향을 미치며, 본 논문에서는 SNR과 안테나 기준선에 대한 방위각 정확도와 위치표정 정확도를 모사하였다. 기준선의 길이가 50m이고 SNR이 40dB 이상이면, 입사방위각 $0^{\circ}$에서 약 $0.51^{\circ}$의 방위탐지 정확도를 얻었다.

Keywords

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