The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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TOA/TDOA Estimation Method Based on Two Way Ranging with Considering Clock Drift Effect

클럭 표류 영향을 고려한 양방향 거리 인지 기반의 TOA/TDOA 추정 방안

  • 박운용 (숭실대학교 정보통신전자공학부 통신 및 신호처리연구실) ;
  • 박철웅 (숭실대학교 정보통신전자공학과) ;
  • 최성수 (한국전기연구원 융합기술연구단) ;
  • 이원철 (숭실대학교 정보통신전자공학부 통신 및 신호처리연구실)
  • Published : 2007.07.31
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Abstract

Generally time of arrival (TOA) information via two way communications can be derived by accurate round trip time (RTT) between two devices. However, response time demanded in RTT measurement is long, a serious TOA error is caused by each different clock drift between two devices. In order to solve this problem, we propose the TOA and time difference of arrival (TDOA) estimation scheme with mitigating clock drift effect. To verify the performance of proposed method, we compared the proposed scheme with one way based TDOA acquisition method introduced by IEEE 802.15.4a Task Group and then we could conclude that the proposed method has better performance over other methods.

일반적으로 양방향 전송을 통한 TOA(Time Of Arrival) 정보는 두 디바이스간의 정확한 RTT(Round Trip Time) 정보로부터 도출되지만 디바이스간의 서로 다른 클럭 표류의 영향으로 인하여 RTT 측정 시 요구되는 응답 시간이 길 경우 매우 심각한 TOA 오차를 야기 시키게 된다. 이를 해결하기 위해서 본 논문에서는 비동기 시스템에서 클럭 표류의 영향을 줄이면서 TOA와 TDOA(Time Difference Of Arrival) 정보를 획득하는 방안을 제안한다. 이를 검증하기 위해서 IEEE 802.15.4a Task Group에서 제시한 단방향 전송을 통한 측위 방안과 비교하였으며 제안된 방안이 기존 방법들보다 개선된 성능을 보임을 확인하였다.

Keywords

References

  1. F. Chin, Zhi. Wanjun and Ko. Chi-Chung, 'System performance of IEEE 802.15.4 low rate wireless PAN using UWB as alternate-PHY layer,' Proc. IEEE Conference on Personal, Indoor and Mobile Radio Communications (PIMRC 2003), Vol. 1, pp.487-491, Sept. 2003
  2. J.C. Adams, W. Gregorwich, L. Capots, and D. Liccardo, 'Ultra-Wideband for Navigation and Communications,' Proc. IEEE on Conference Aerospace, Vol. 2, pp.785-792, March 2001
  3. R.J. Fontana, S.J. Gunderson, 'Ultra-Wideband Precision Asset Location System,' Proc. IEEE Conference on UWB Systems and Technologies (UWBST), pp.147-150, May 2002
  4. D. Niculescu and N. Badri, 'Ad hoc positioning system (APS) using AOA,' Proc. 22th Joint IEEE Computer Communications Soc. (INFOCOM' 03), vol. 3, Mar. 30-Apr. 3, pp. 1734-1743, 2003
  5. K. Pahlaven and X. Li, 'Indoor geolocation science and technology,' IEEE Commun. Mag., vol. 40, no. 2, pp. 112-118, Feb. 2002
  6. Y. Ohta, M. Sugano and M. Murata, 'Autonomous localization method in wireless sensor networks,' Proc. IEEE conference on Pervasive Computing and Communications Workshops (PERCOMW 2005), pp.379-384, March 2005
  7. IEEE 802.15-TG4a, Precision Ranging Subcommittee, 'Ranging Subcommittee Final Report,' available at http://ieee802.org/15/pub/TG4a.html
  8. R. Hach, 'Symmetric Double Sided Two-Way Ranging', IEEE P802.15 Working Group for Wireless Personal Area Networks (WPAN), Doc. IEE P.802.15-05-0334-00-004a, June 2005