• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.48 no.6
• /
• pp.401-410
• /
• 2020

In this study, a real-time Tactical UAS position compensation system based on image information developed to compensate for the weakness of location navigation information during GPS signal interference and jamming / spoofing attack is described. The Tactical UAS (KUS-FT) is capable of automatic flight by switching the mode from GPS/INS integrated navigation to DR/AHRS when GPS signal is lost. However, in the case of location navigation, errors accumulate over time due to dead reckoning (DR) using airspeed and azimuth which causes problems such as UAS positioning and data link antenna tracking. To minimize the accumulation of position error, based on the target data of specific region through image sensor, we developed a system that calculates the position using the UAS attitude, EO/IR (Electric Optic/Infra-Red) azimuth and elevation and numerical map data and corrects the calculated position in real-time. In addition, function and performance of the image information based real-time UAS position compensation system has been verified by ground test using GPS simulator and flight test in DR mode.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2009.10a
• /
• pp.241-244
• /
• 2009

Recently car navigation systems which are widely spreaded and provide routes exactly have been evolved. The systems use various information and techniques as follows. In order to provide shortest path with good flow, realtime traffic information provided by DMB is used. Augmented reality technique is also introduced to give the sense of real to driver by displaying real images captured by camera during driving. But these operate well when the GPS receives data normally. Exact information about the position of vehicles becomes a base that supports the above function with realities. This paper proposes a method for compensating a given path. It uses various information by integrated vehicle networks when the GPS does not operates normally.

• Proceedings of the Korea Contents Association Conference
• /
• 2010.05a
• /
• pp.274-276
• /
• 2010

WADGPS 또는 Beacon DGPS를 이용하여 해상준설선의 유도와 측량을 위한 실시간 준설관리시스템을 구축하고자 하였다. 이 시스템은 GPS에 의한 선박위치측정, GPS/Gyro 통합장비에 의한 선박방향측정, 그라브 위치측정, 준설심도측정 및 보정의 기능을 갖도록 하였다. 또한 구축된 준설공정관리시스템을 제어 운용하기 위한 프로그램을 개발하였다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2023.05a
• /
• pp.760-762
• /
• 2023

본 논문에서는 TMAP API와 실시간 제보 및 경보 기능을 이용하는 안드로이드 애플리케이션 구현하고자 한다. TMAP API를 이용하여 사용자의 매 초마다의 위치를 기록하고, 해당 위치값을 토대로 산책 경로를 가시적으로 나타내는 것이 가능하다. 실시간 경보 시스템은 사용자가 산책 중에 발견한 돌발 상황을 제보하여 서버에 제보에 대한 위치와 내용을 저장하는 시스템이다. 이를 통해, 사용자가 산책 중에 해가 되는 위험 요소를 미리 알고 예방할 수 있으며, 비 정기적 행사와 같은 새로운 기회를 공유 받을 수 있다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2014.01a
• /
• pp.257-260
• /
• 2014

본 논문에는 무선 랜 기반 위치 추적 시스템을 이용하여 실내에 주차된 자동차 위치에 도달하기까지의 방향과 거리 정보를 제공할 수 있는 앱 어플리케이션 설계를 제안한다. 기존 WPS 기능에 삼각측량법을 더하여 정확도를 높이고 실내에 주차된 차량의 위치 관리가 용이하게끔 하는 것을 목적으로 두었다. 이를 위해 WPS와 전파의 세기를 이용한 삼각측량법을 적용하여 설계한 알고리즘을 제시한다. 프로그램 코드 개선 및 구체화는 해당 알고리즘을 가상 환경에서 구현하였다. 스마트폰의 동기화 센서를 이용하여 실시간으로 DB 서버를 접속함으로서 시간 차이로 인해 측정된 위치 정확성이 저하되는 문제를 보정하였다. 따라서 제안한 앱 어플리케이션은 GPS 통신이 불안정한 실내 및 지하에 주차된 자동차의 위치를 사용자가 찾아내는데 효율성을 제공할 수 있다.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1994.10a
• /
• pp.343-347
• /
• 1994

최근의 기계 가공시스템은 가공기능이 고밀도로 압축되어, 작업자가 진행중인 가공상태를 단시간 내에 파악하기 어려울정도로 복잡하다.그러나 단위 기계별로 공정의 복합화와 자동화가 꾸준히 추진되어 가공기당 투입 작업인원 을 감소시키으로써 생산성을 증가시키고 있다. 이와 함께 작업자의 관리 영역은 오히여 증가해서 여러 대의 기계를 동시에 관리하게 되어, 그 중에 한 기계가 갑자기 이상동작을 일읠 경우 즉각적인 원인파악과 조치를 취하기가 매 우 어렵다. 그래서 요사이 작업자의 이상상태 파악을 위해 감시시스템을 설치하여 즉시 원인을 파악할수 있도록 하고 더 나아가서 자동제어 기능을 추가해서 실시간으로 이상상태를 보완,보정하도록 시도하고 있다. 본 연구에서는 공작기계의 신뢰성있는 열변형 예측을 위해 온도센서의 부착 위치를 최적으로 결정하는 방법을 일점센서와 다점 센서일 경우로 나누어 제시하였다.

• Journal of the Korean Society for Precision Engineering
• /
• v.17 no.1
• /
• pp.76-82
• /
• 2000

An arc sensor system to compensate positional errors was developed on the foundation of sensor interface system to make use of the on-line shift function of industrial welding robot. Investigating the on-line shift function, we examine the quantitative relationship between the deviation from programmed path and the correction data transferred from personal computer to robot controller. The number of input parameters for weld seam tracking can be reduced by making the relationship between the deviation and the correction data during half weaving be the function of only cross time. With the results of weld seam tracking for the butt joint with V-groove and fillet joint of sheet metal, good performance was implemented. By developing the sensor interface system to compensate the positional errors, industrial welding robot can be expected to contribute to the promotion of welding automation.

• Korean Journal of Remote Sensing
• /
• v.39 no.6_2
• /
• pp.1529-1539
• /
• 2023

The data from Geostationary Ocean Color Imager-II (GOCI-II), which observes the color of the sea to monitor marine environments, undergoes various correction processes in the ground station system, producing data from Raw to Level-2 (L2). Quality issues arising at each processing stage accumulate step by step, leading to an amplification of errors in the satellite data. To address this, improvements were made to the GOCI-II ground station system to measure potential optical quality and geolocation accuracy errors in the Level-1A/B (L1A/B) data. A newly established Radiometric and Geometric Performance Assessment Module (RGPAM) now measures five optical quality factors and four geolocation accuracy factors in near real-time. Testing with GOCI-II data has shown that RGPAM's functions, including data processing, display and download of measurement results, work well. The performance metrics obtained through RGPAM are expected to serve as foundational data for real-time radiometric correction model enhancements, assessment of L1 data quality consistency, and the development of reprocessing strategies to address identified issues related to the GOCI-II detector's sensitivity degradation.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.29 no.6
• /
• pp.613-620
• /
• 2011

In order to perform scientific evaluation of dredge results, it is needed to construct the system which is able to manage and evaluate the work process by monitoring in real-time the dredge process such as dredge ship position, dredge depth and dredge volume. This research aims to develop the hydrographic dredge surveying system adding water depth measurement method to both precise positioning and navigation methods using GPS, which allows a high rate of measurement and long distances between the control point and dredging points, operate in all weather conditions, and does not require line of sight to points. We constructed Beacon DGPS-based hydrographic dredger guidance and position management system and developed the operation program which makes the dredge operation perform as monitoring work situation in real-time. It is expected that this developed system will be able to contributes to reducing ultimately the cost in hydrographic dredging or hydrographic construction industries.

• Journal of Korean Society for Geospatial Information Science
• /
• v.21 no.4
• /
• pp.3-12
• /
• 2013

In order to evaluate dredging results scientifically the system which can manage and estimate working process by monitoring dredging process in real-time needs to be constructed. We constructed real-time dredging management system for guidance of a dredging vessel and for survey of dredging construction. This system was designed to have functions of dredger location by GPS, ship direction measurement by GPS/Gyroscope combination, Grab position measurement, dredging depth measurement and correction. In addition, we developed the programs for controlling and operating the constructed system. The system could induce the vessel to accurate position and conduct dredging according to plan and the effectiveness of the system was evaluated through the results of application to actual dredging construction site.