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수동 페이저 컨쥬게이션 수중음향통신 기법의 비트오류 영향 인자
윤종락,박문갑,노용주,Yoon, Jong-Rak,Park, Moon-Kab,Ro, Yong-Ju 한국음향학회 2005 韓國音響學會誌 Vol.24 No.8
수중음향채널의 다중경로에 의한 수신신호의 지연확산은 ISI (Inter-Symbol Interference)를 유발하여 수중음향 통신시스템의 성능을 저하시킨다. 본 연구에서 적용하는 수동 페이저 컨쥬게이션 기법은 신호대 다중경로 간섭 신호비를 크게 하여 다중경로에 의한 주파수 선택성을 경감시켜 ISI를 줄이는 다이버시티 통신기법이다. 신호 대 다중경로 간섭신호비의 개선과 이에 따른 주파수 선택성은 수동 페이저 컨쥬게이션에 적용하는 수신기 배열의 배열 센서 개수, 송수신기의 상대운동에 의해 좌우되며, 따라서 비트 오류특성이 결정된다. 본 연구에서는 이들의 특성을 수치모의 실험으로 해석하였다. Time spread due to the multipath in underwater acoustic channel, induces ISI (Inter-Symbol Interference) which degrades the performance of the underwater acoustic communication system. The passive phase conjugation (PPC) which improves the signal to multipath interference ratio (SMR) and therefore reduces the frequency selectivity. is a diversity communication technique giving a less ISI under multipath fading channel. Its frequency selectivity depends on the number of receiver array sensors and time varying source to receiver range. In this study, frequency selectivity of the PPC and its effects on bit error of underwater acoustic communication is analyzed by numerical simulation.
시설물의 장기 거동 측정을 위한 실시간 GNSS 모니터링 시스템 개발
김동희 ( Kim Dong-hoi ),노용주 ( Ro Yong-ju ),박기정 ( Park Ki-jung ),최준성 ( Choi Jun-seong ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
Such structures as dams, slops and soft grounds are characteristic of leisurely movement. These movements threaten to do their users safety. Therefore, to monitor the movement of the structures could help to verify their movements. CDGPS method allows the use of a static base station and remote rover unit to allow for data collection within several seconds and in real time by milli-meter accuracy. It is useful for monitoring the behaviors of slops and soft grounds. Completed real-time GNSS monitoring system through this research is acquire data of GNSS receiver by wireless, and relative coordinate of measure point using CDGPS method. In this Research, we explain structure of real-time GNSS monitoring system and the prove practicality on the basis of result that is operated after establishment.
시설물의 장기 거동 측정을 위한 실시간 GNSS 모니터링 시스템 개발
김동회(Kim Dong-Hoi),노용주(Ro Yong-Ju),박기정(Park Ki-Jung),최준성(Choi Jun-Seong) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
Such structures as dams, slops and soft grounds are characteristic of leisurely movement. These movements threaten to do their users safety. Therefore, to monitor the movement of the structures could help to verify their movements. CDGPS method allows the use of a static base station and remote rover unit to allow for data collection within several seconds and in real time by milli-meter accuracy. It is useful for monitoring the behaviors of slops and soft grounds. Completed real-time GNSS monitoring system through this research is acquire data of GNSS receiver by wireless, and relative coordinate of measure point using CDGPS method. In this Research, we explain structure of real-time GNSS monitoring system and the prove practicality on the basis of result that is operated after establishment.