• 한국항행학회논문지
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• 제24권1호
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• pp.16-27
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• 2020

본 논문에서는 위성항법 불용 환경에서의 무인비행체 항법을 위한 광류 정보 활용에 관한 연구 내용을 기술한다. 광류 정보는 위성항법 불용 환경에서 수평 위치 및 속도 추정을 위해 중요한 측정값이므로 정확한 광류 정보의 획득은 필수적이다. 이에 광류 정보에 포함될 수 있는 바이어스를 추정하여 상쇄함으로써 추정 성능을 향상시킬 수 있는 항법 알고리즘을 제안한다. 제안된 알고리즘을 적용하여 검증하기 위해 유도, 항법, 제어 시스템을 설계하여 통합 시뮬레이션 환경을 구축한다. 이를 기반으로 수치 시뮬레이션을 수행하여 제안된 알고리즘을 분석한다.

• 한국해양공학회지
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• 제31권4호
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• pp.315-323
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• 2017

This paper presents an integrated navigation system that combines ultra-short baseline (USBL), Doppler velocity log (DVL), and heading measurements for a deep-sea remotely operated vehicle, Hemire. A navigation model is introduced based on the kinematic relation of the position and velocity. The system states are predicted using the navigation model and corrected with the USBL, DVL, and heading measurements using the Kalman filter. The performance of the navigation system was confirmed through re-navigation simulations with the measured data at the Southern Mariana Arc submarine volcanoes. Based on the characteristics of the measurements, the design process for the parameters of the system modeling error covariance, measurement error covariance, and initial error covariance are presented. This paper reviews the influence of the outliers and blackout of the USBL and DVL measurements, and proposes an outlier rejection algorithm that is robust to USBL blackout. The effectiveness of the method is demonstrated with re-navigation for the data that includes USBL blackouts.

• 한국정보통신학회논문지
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• 제25권12호
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• pp.1927-1934
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• 2021

선박의 안전한 항해를 돕기 위하여 해상에 항로표지를 설치하여 운영하고 있다. 해상 ICT(Information and Communications Technology)의 발달로 AtoN AIS( Automatic Identification System) 및 CDMA(Code Division Multiple Access), LTE(Long Term Evolution) 등 다중통신망을 이용하여 육상에서 해상 항로표지의 상태를 감시하고 제어가 가능해졌다. 현재 항로표지 관리운영시스템은 지방해양수산청의 운영상황에 따라 독자적으로 개발 및 운영되고 있어 정보를 통합적으로 관리하기 어렵다. 또한, e-Navigation 및 무인운항선박 도입에 대비하여 체계적이고 일원화된 항로표지 정보가 요구된다. 본 논문에서는 항로표지 정보 국제표준(S-201)을 적용한 항로표지 통합관리운영 표준 소프트웨어 설계 및 개발을 수행하였다. 이를 통하여 체계적이고 지속적인 항로표지 정보의 제공 및 효과적인 항로표지 관리가 가능할 것이다.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 공동학술발표회
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• pp.171-171
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• 2017

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.197-198
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• 2010

• 한국항해학회지
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• 제15권2호
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• pp.87-96
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• 1991

The change of water level at Mokpo Harbour and its adjacent coastal area due to the construction of the Youngsan Estuary Barrage and the Third Land Reclamation Work of estuary barren had been roughly expected. Periodical floods, which occur 2 times per month, are also being observed at the low lying commercial areas near the Mokpo Old Harbor. Although it is said that the highest tidal current component among the tidal current records at the approaching channel to Mokpo Harbor is reduced to 6 kts, because of the esturary barrage, they do not give any precise statement or a deep analysis for the flooding and periodical water level change under certain environmental conditions. Moreover, they never tried the analysis of development plan considering the natural disaster such as typhoon or other extreme conditions. Thus, it is necessary to collect and analyze the data related to floodings, harbor oscillations, currents, and water quality , etc. because of the development considering the extreme condition. Thus, it is necessary to collect and analyze the data related to floodings, harbor oscillations, currents, and water quality, etc. because of the development considering the extreme condition and to evaluate the field observation and measurement, including the numerical model simulation based on the scientific approaches. This study deals the problem of the water level change among the integrated analyses of the coastal area changes. The result can be used for the integrated planning to give a strong foundation and it will contribute to the development of local area.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.978-983
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• 2003

In this paper, we propose a fault detection method for extended Kalman filter in decentralized filter structure. To detect a fault, a consistency between filter output and a monitoring signal is tested. State propagators are used to obtain the monitoring signal. However, the output of state propagator increases in magnitude and finally diverges as time runs. To solve such problem, two-propagator method was proposed for linear system. Two propagators are reset by Kalman filter output, alternatively, to avoid divergence. But a test statistics change abruptly at the reset instant in that method. Hence a N-step propagator method is proposed to fix up the problem. In the N-step propagator, only time propagations are performed from k-N+1 step to k step without measurement updates. A test statistics are defined by errors and its covariance between extended Kalman filter and N-step propagator. These fault detection methods are applied to integrated strapdown inertial navigation system (SDINS). By computer simulation, it is shown that the proposed methods detect a fault effectively.

• 한국항행학회논문지
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• 제14권1호
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• pp.127-133
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• 2010

운영연속성관리계획 수립을 위한 프로세스는 비즈니스 위험 평가, 취약성 분석, 업무영향분석, 업무복구전략수립, 상세계획수립, 계획실행, 테스트 및 유지관리(모니터링 포함)의 반복적인 사이클을 구성할 수 있다. 관리체계는 조직에 발생하는 재난 관리 체계를 개발, 수행, 개선, 유지와 업무 연속성 확보 체계를 위한 책임 의무사항 제공과 함께 재난예방, 재난대비, 재난대응, 재난복구를 위한 재난관리체계를 평가할 수 있다. 따라서 본 논문에서는 글로벌 환경변화에 대응하고 사회 안전 시스템의 구축과 운영의 극대화를 위하여 운영연속성관리, 위기관리체제 구축 및 위기관리통합체제 구축에 대하여 전반적으로 기술하고 조직 내에서 운영연속성관리를 이해하고 발전시켜 실행하기 위한 기틀을 제공하고자 운영연속성관리 관점에서의 위기관리통합시스템 구축 방법을 제안하였다.

• 수산해양기술연구
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• 제42권2호
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• pp.97-103
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• 2006

The integrated navigation system(INS) for fishing boat which organized the marine radar, global positioning system(GPS) compass, automatic identification system(AIS), echo sounder, GPS and electronic nautical chart(ENC) was manufactured to reduce the marine accidents of fishing boats occurred frequently at coastal and offshore. The application possibility of INS for fishing boat was examined for basic experiments in the sea. Integration display of various information, such as other vessel's behavior, depth, own vessel's position etc. was done to help the operate user who understood the circumstance around own boat. Therefore, the system will be utilized as a useful equipment for safety voyage and fishing work on the fishing ground.

• 수산해양기술연구
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• 제42권2호
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• pp.104-110
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• 2006

The 3D visualization of seafloor topography(ST) was realized to discuss the effective use by the 3D visualization of ST on the integrated navigation system(INS) for fishing boat. The software was to actually display the 3D visualization of ST using triangular irregular network, helical hyperspatial codes and stereo projection. The INS for fishing boat which applied the 3D visualization of ST will be utilized for safety voyage and the effective fishing work on the fishing ground.