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Implementation of AIS Transponder with a New Time Synchronization Method  

이상정 (충남대학교 전기정보통신공학부 GNSS 기술연구센터)
최일흥 (충남대학교 전자공학과 GNSS 기술연구센터, (주)네비콤)
오상헌 (충남대학교 전자공학과 GNSS 기술연구센터)
윤상준 (충남대학교 전자공학과 GNSS 기술연구센터(주)네비콤)
박찬식 (충북대학교 전기전자공학부)
황동환 (충남대학교 전기정보통신공학부 GNSS 기술연구센터)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.40, no.7, 2003 , pp. 273-281 More about this Journal
Abstract
This paper proposes a new time synchronization scheme for the Automatic Identification System(AIS). The proposed scheme utilizes a Temperature Compensated Crystal Oscillator(TCXO) as a local reference clock, and consists of a Digitally Controlled Oscillator(DCO), a divider, a phase comparator, and register blocks. Primary time reference is IPPS from GPS receiver that is synchronized to Universal Time Coordinated(UTC). And if GPS is unavailable, other station's signal is utilized as secondary time reference. The phase comparator measures time difference between the 1PPS and the generated transmit clock. The measured time difference is compensated by controlling the DCO and the transmit clock is synchronized to the Universal Time Coordinated(UTC). The synchronized transmit clock(9600Hz) is divided into the transmitting time slot(37.5Hz). The proposed scheme is tested in an experimental AIS transponder set. The experimental result shows that the proposed module satisfies the timing specification of the AIS technical standard, ITU-R M.1371-1.
Keywords
AIS; TDMA; Time Synchronization;
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  • Reference
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