• Title, Summary, Keyword: Target vessel

Search Result 154, Processing Time 0.031 seconds

Accuracy Improvement of Stereo-Based Distance Measurement for Close Range Vessel Positioning

  • Ogura, Tadashi;Mizuchi, Yoshiaki;Kim, Young-Bok;Choi, Yong-Woon
    • Journal of Power System Engineering
    • /
    • v.19 no.2
    • /
    • pp.27-32
    • /
    • 2015
  • This paper describes a distance measurement system with high accuracy that utilizes a stereo-based camera and a pan-tilt unit for automatically maintaining the positional relationship between a vessel and a target on the side of a facility at a close range. The measurement system offers an advantage in that it can measure the distance to a target while tracking it. In order to improve the ability to control the position of a vessel between it and a target while maintaining the distance especially at a close range, the accuracy of the measurement system has to be improved. The accuracy of the distance measured by our system is increased with revisions of the conclusively generated data of distance measurement. We verified the accuracy of our system from an experiment, which generated results that had an accuracy of 30 mm for distances in the range between 2-8 m.

A Calibration Technique and its Error Analysis for the Position of Seabed Sonar Target (해저고정 소나표적의 위치교정기법과 오차해석)

  • 이상국;이용곤
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.6 no.3
    • /
    • pp.15-21
    • /
    • 2003
  • This paper contains a precise calibration technique for the position of seabed acoustic target and theoretical error analysis of calibration results. The target is deployed on seabed as a standalone transponder. The purpose of target is performing accuracy test for active sonar as well as position calibration itself. For the position calibration, relative range between target and test vessel should be measured using target's transponder function. The relative range data combined with vessel position can be converted into a estimated position of target by the application of nonlinear LSE method. The error analysis of position calibration was divided into two stages. One is for relative range estimator and the other for target position estimator. Numerical simulations for position calibration showed good matching between results and developed CRLB.

The LED lamp synchronous light control and charge/discharge system by using GPS (GPS를 이용한 LED 동기점멸등 제어 및 충방전 시스템)

  • Jang, Hye-Young;Son, Young-Dae;Kim, Cherl-Jin
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.157-159
    • /
    • 2007
  • For a vessel to safely navigate on the ocean, it is required to check the vessel position as frequently as possible. When a vessel navigates oil the ocean or entering/leaving a port, the target area such as islands, points and mountain peak, etc. are used. However, when such target are not available or when vessel navigates in night time, installed artificial navigation aid facilities help successful vessel navigation. Light Wave Aid helps to confirm a position to the navigator directly and quickly. So, the synchronous light to display the accurate signal has wide applications. However, lantern domestic industry is small, and most of the products show non-compatibility. Consequently, this paper presents the synchronous lighting using UTC of GPS, which maintains compatibility with different lanterns. Also, by replacing conventional electric bulb with LED lamp, simple and efficient lighting system is obtained.

  • PDF

A Study on the Radar Operational and Technical Performance Requirements for Vessel Traffic Service

  • JEON, Joong Sung
    • Journal of Navigation and Port Research
    • /
    • v.44 no.2
    • /
    • pp.110-118
    • /
    • 2020
  • With the expansion of the shipping and port logistics industry in the 21st century, the traffic density is continuously increased because of the increase in volumes of world sea freight and fleets, as well as the increase in the causes of potential marine accidents, such as ship collisions and stranding. Accordingly, the International Maritime Organization (IMO) has requested that the installation and operation of VTS should be applied in areas with high risk of marine traffic, and the request should be included as one of the Safety of Life at Sea (SOLAS) regulations. In this paper, the fundamental requirements of the radar system for vessel traffic services were analyzed and the analyzing factors were based on the IALA guideline.s This paper also includes results for the requirement and recommendation analysis on detection distance, target separation, and the target position accuracy of X-band radar. Also, to check if it satisfies the requirement of detection distance, range and azimuth separation of small point targets, and target position accuracy from the IALA guidelines, the test was conducted through the radar image acquired at the VTS center, and hence, the validity of the technical performance requirements was confirmed.

Tracking Error Performance of Tracking Filters Based on IMM for Threatening Target to Navel Vessel

  • Fang, Tae-Hyun;Choi, Jae-Weon
    • International Journal of Control, Automation, and Systems
    • /
    • v.5 no.4
    • /
    • pp.456-462
    • /
    • 2007
  • Tracking error performance is investigated for the typical maneuvering pattern of the anti-ship missile for tracking filters based on IMM filter in both clear and cluttered environments. Threatening targets to a navel vessel can be categorized into having three kinds of maneuvering patterns such as Waver, Pop-Up, and High-Diver maneuvers, which are classified according to launching platform or acceleration input to be applied. In this paper, the tracking errors for three kinds of maneuvering targets are represented and are investigated through simulation results. Studying estimation errors for each maneuvering target allows us to have insight into the most threatening maneuvering pattern and to construct the test maneuvering scenario for radar system validation.

Analysis of Radar Performance Requirements for VTS System Based on IALA Guidelines (IALA 가이드라인에 기반한 VTS 시스템을 위한 레이더 성능 요구사항 분석)

  • Kim, Byung-Doo;Lee, Byung-Gil
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • /
    • pp.27-29
    • /
    • 2015
  • Based on IALA guidelines, the fundamental requirements of radar system for vessel traffic services are analyzed in this paper. target separation, target position accuracy, target track accuracy of X-band radar and recommended test conditions are analyzed. Also, in order to check if it satisfies the requirement of target position accuracy from IALA guideline, the test is carried out through processing of radar raw image acquired at VTS center.

  • PDF

A Study on the Relation between Towing Force of Tow Vessel and Towing Point and Behavior of Towed Ship (예인력과 피예인선의 예인 지점과 거동에 관한 연구)

  • Nam, Taek-Kun
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.19 no.6
    • /
    • pp.637-642
    • /
    • 2013
  • In this paper, an analysis results of towing force and towing points which are dominating factors to determine the behavior of towed ship are introduced. The towing force and towing points to achive the desired posture and its position of the towed vessel are derived based on simplified dynamics and linearization method. LQR algorithm for posture control is applied to linearized system and numerical simulation is also executed. Force based on COG(cneter of gravity) and gain of controller to achieve desired posture for target vessel are obtained by using Riccati matrix equation and pseudo inverse matrix is applied to analyze the relation between the derived force and its towing point. Based on this analysis method, towing force need to move the towed vessel from its initial position to target position can be calculated. The towing method including towing point and direction is also considered on this method. Finally, the relation between towing force and towing point is confirmed from the analysis and the results can be applied to arrangement of tug boats during salvage works.

Fishing efficiency by vessel capacity of Korean tuna purse seiners operating in the western and central Pacific Ocean (태평양 수역 우리나라 다랑어선망어업의 선박 역량에 따른 조업 효율성 분석)

  • LEE, Mi Kyung;LEE, Sung Il;KIM, Doo Nam;KU, Jeong Eun;KWON, Youjung
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.53 no.2
    • /
    • pp.169-176
    • /
    • 2017
  • Tuna purse seine fishery in the western and central Pacific Ocean (WCPO) has been rapidly developed since early 1980s due to massive investment of major distant water fishing nations, and catch by purse seine fishery operating in the WCPO accounts for nearly half of the world's tuna total catch. As fishing efficiency is reflected by not only improving of individual vessel's capacity but also increasing number of active vessel, it is essential to understand vessel capacity for reliable assessment result on how fishery affects stock status of target species. In this study, fishing efficiency was analyzed by main factors which are representative of vessel capacity using fishing data and vessel information related to Korean tuna purse seine fishery operating in the western and central Pacific Ocean from 1992 to 2014. It showed that fishing efficiency of vessel tends to be higher when having larger vessel tonnage, higher engine power, lower vessel age and larger length of vessel. As for fishing efficiency by set type, CPUE of associated set with floating objects was generally higher than that of free school set, and CPUE of free school set seemed to have a greater effect on engine power and vessel age compared to other factors.

Pulse Integration Technique for VTS Application (VTS 적용을 위한 펄스 적분 기법)

  • Park, Dong-Hwa;Jeong, Se-Young;Choi, Kwan-Beum;Kim, Byung-Doo
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.39C no.7
    • /
    • pp.521-527
    • /
    • 2014
  • Most of Sea Surveillance Radar(SSR)s which are used in Vessel Traffic Service are Magnetron-based Non-Coherent Method and use the pulse integration technique having a signal to noise ratio enhancement function to satisfy a surveillance performance about target. Especially, Pulse Integration technique has an effect on target serveillance performance through signal to noise ratio, in addition, has an effect to improve a signal interference and noise spike. In this paper, we have a simulation experiment by using MATLAB simulation tool for appling a pulse integration technique in VTS system using a Non-Coherent radar, and verify an optimum pulse integration technique through out performance analysis between frequently use pulse integration techniques.

Estimation Process for the Capacity of Emergency Drainage System on a Ship after Flooding Accident (선박 침수사고를 대비한 비상용 배수시스템 용량추정 프로세스에 관한 연구)

  • PARK, Byung-Soo;KIM, Sung-Soo;LEE, Soon-Sup;KANG, Dong-Hoon;CHO, Hyun-Kuk
    • Journal of Fisheries and Marine Sciences Education
    • /
    • v.28 no.6
    • /
    • pp.1739-1750
    • /
    • 2016
  • This paper proposed a process for estimating the required capacity of emergency drainage system on a ship when the ship encounters a flooding accident. The process was established by selecting target vessel, making a scenario of flooding accident, considering static behavior of flooding water and the effect of ship motion due to ocean condition. In order to obtain the object of the research, MATLAB codes were developed for analyzing of static behavior of flooding water. Additionally, Ansys AQWA-NAUT was used to analyze the motion of the ship under an ocean condition and then the effect of ship motion was considered when the static behavior of flooding water was studied. The research exploited a trawler as a target vessel, and estimate the necessary capacity of the trawler's emergency drainage system by simulating a flooding water in the vessel.