• Defense and Technology
• /
• no.5 s.207
• /
• pp.14-25
• /
• 1996

한국에서 궁극적으로 큰 안보위험이 될 수 있는 중국이 최근의 군비증강을 통해 공중 및 해상방위 능력을 강화하고 있다는 점은 매우 시사적이다. 한국은 중국의 군사력 증강과 수반되어 나타나고 있는 외부 세력과의 직접적인 군사력 충돌에 대비한 적절한 조치를 강구하여야 할 것이며, 이와 함께 이러한 충돌의 가능성을 사전에 줄여나가는 것도 매우 중요하다.

• Defense and Technology
• /
• no.7 s.197
• /
• pp.66-79
• /
• 1995

지난 5월 12일에서 18일까지 4차 함상토론회가 독도 및 울릉도 해상의 천지함에서 개최되었다. 이날 토론회에서 21세기 동북아 안보와 해양안보 정세를 전망하고 유엔해양법 발효에 따른 주변국의 해양정책 변화 가능성을 분석하여 장차 한국의 해양권익을 보호하기 위한 방안을 모색해 보았다. 이에 주제발표와 열띤 토론으로 진행된 내용을 순서대로 요약해 보았다.

• Journal of Navigation and Port Research
• /
• v.37 no.5
• /
• pp.447-452
• /
• 2013

Vessel traffic system uses multiple sea surveillance radars as a primary sensor to obtain maritime traffic information like as ship's position, speed, course. The systematic errors such as the range bias and the azimuth bias of the two-dimensional radar system can significantly degrade the accuracy of the radar image and target tracking information. Therefore, the systematic errors of the radar system should be corrected precisely in order to provide the accurate target information in the vessel traffic system. In this paper, it is proposed that the method compensates the range bias and the azimuth bias using AtoN information installed at VTS coverage. The radar measurement residual error model is derived from the standard error model of two-dimensional radar measurements and the position information of AtoN, and then the linear Kalman filter is designed for estimation of the systematic errors of the radar system. The proposed method is validated via Monte-Carlo runs. Also, the convergence characteristics of the designed filter and the accuracy of the systematic error estimates according to the number of AtoN information are analyzed.

• Aerospace Industry
• /
• s.96
• /
• pp.12-21
• /
• 2007

제6회 "한국 항공우주 및 방위산업 전시회 2007"이 오는 10월 16일부터 21일까지 6일간 서울공항(경기도 성남 소재)에서 국내외 인사 및 민∙관∙군 주요 관계자들이 참가한 가운데 개최된다. 이번 행사는 항공우주무기체계는 물론 지∙해상 미래 최첨단 무기체계까지 함께 전시돼 급변하는 미래 안보환경에 대응하기 위한 세계 각국의 첨단 군사장비 및 방위산업 기술의 현재와 미래를 직접 확인하고 살펴볼 수 있는 기회가 될 것으로 보인다.

• Defense and Technology
• /
• no.7 s.197
• /
• pp.24-31
• /
• 1995

• Defense and Technology
• /
• no.9 s.223
• /
• pp.56-63
• /
• 1997

• Defense and Technology
• /
• no.10 s.224
• /
• pp.40-51
• /
• 1997

• Defense and Technology
• /
• no.11 s.129
• /
• pp.28-37
• /
• 1989

해상자위대는 질이나 양적인 면에서 일관된 생산정책에 의해 그 기반이 유지되고 있으며, 조선소의 수많은 기술자들이 함대 현대화를 위해 노력을 경주하고 있다. 금년도 예산에는 2척의 1천9백톤형 프리킷함과 1척의 2천4백톤형 대잠전 잠수함, 2척의 1천톤형 해양소해함과 1척의 2천8백톤형 음향측정함의 건조가 반영되어 있다. 현재 일본 해상자위대는 해군 항공대를 포함하여 4만6천명의 장병과 4천명을 상회하는 군무원들로서 편성되어 있다

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.28 no.4
• /
• pp.499-506
• /
• 2022

For autonomous ships to be commercialized and be able to navigate in coastal water, they must be able to detect maritime obstacles. One of the most common obstacles seen in coastal area are the farm buoys. In this study, a maritime object detection system was developed that detects buoys using the YOLO algorithm and visualizes the distance and bearing between buoys and the ship through geometric interpretation of camera images. After training the maritime object detection model with 1,224 pictures of buoys, the precision of the model was 89.0%, the recall was 95.0%, and the F1-score was 92.0%. Camera calibration had been conducted to calculate the distance and bearing of an object away from the camera using the obtained image coordinates and Experiment A and B were designed to verify the performance of the maritime object detection system. As a result of verifying the performance of the maritime object detection system, it can be seen that the maritime object detection system is superior to radar in its short-distance detection capability, so that it can be used as a navigational aid along with the radar.

• Journal of the Institute of Convergence Signal Processing
• /
• v.20 no.4
• /
• pp.245-251
• /
• 2019

Sonar bearing accuracy is the correspondence between the target orientation predicted by sonar and actual target orientation, and is obtained from measurements. However, when measuring sonar bearing accuracy, many errors are included in the results because they are made at sea, where complex and diverse environmental factors are applied. In particular, parallax error caused by the difference between the position of the GPS receiver and the sonar sensor, and the time delay error generated between the speed of underwater sound waves and the speed of electromagnetic waves in the air have a great influence on the accuracy. Correcting these parallax errors and time delay errors without an automated tool is a laborious task. Therefore, in this study, we propose a sonar bearing accuracy measurement equipment with parallax error and time delay error correction. The tests were carried out through simulation data and real data. As a result of the test it was confirmed that the parallax error and time delay error were systematically corrected so that 51.7% for simulation data and more than 18.5% for real data. The proposed method is expected to improve the efficiency and accuracy of sonar system detection performance verification in the future.