• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.157-158
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• 2020

항만용 자율주행 야드트럭운행 환경은 무신호교차로 주행, 낮은 GPS정확도, 악천후상황주행, 이송 컨테이너 위치변경등과 같이 일반 도로의 센서기반의 자율주행차량 운행과 다르게 매우 복잡하다. 이를 위해서는 항만내 특성을 반영한 실시간 위치, 속도 등에 대한 정확한 인식이 중요한 요소이다. 이를 위해서 센서융합과 V2X기반의 복합적인 항만용 실시간 로컬 동적지도 (Local Dynamic Map) 생성 및 V2X기반의 협력측위를 통하여서 기존의 독립적인 자율주행차량의 위치 인식보다 더 개선된 고정밀 위치 인식 정보추출이 필요하다. 본 연구에서는 복합적인 항만용 동적지도 생성관리시스템의 설계 방안 및 협력측위 기술 적용 방안을 제시하고 이를 활용한 항만 구역내 자율주행차량 및 모든 화물 이송장비들의 실시간 위치 인식뿐만 아니라 이동체의 사전 충돌예측 및 비상정지 안전 제어 가능한 V2X 기반의 인텔리젼스 한 3차원 관제시스템 설계 방안을 제시하고자 한다.

• Journal of Cadastre & Land InformatiX
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• v.52 no.2
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• pp.53-65
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• 2022

According to the advancement of the GNSS satellite positioning system, the module of hardware and operation software reflecting accuracy and economical efficiency is implemented in the user sector including the multi-channel GNSS receiver, the multi-frequency external antenna and the mobile app (App) base public positioning analysis software etc., and the multichannel GNSS RTK positioning of the active configuration method (DIY, Do it yourself) is possible according to the purpose of user. Especially, as the infrastructure of multi-GNSS satellite is expanded and the potential of expansion of utilization according to various modules is highlighted, interest in the utilization of multi-channel low-cost GNSS receiver module is gradually increasing. The purpose of this study is to review the multi-channel low-cost GNSS receivers that are appearing in the mass market in various forms and to analyze the utilization plan of the "address information facility investigation project" of the Ministry of Public Administration and Security by constructing the multi-channel low-cost GNSS positioning module based RTK survey system (hereinafter referred to as "multi-channel GNSS RTK module positioning system"). For this purpose, we constructed a low-cost "multi-channel GNSS RTK module positioning system" by combining related modules such as U-blox's F9P chipset, antenna, Ntrip transmission of GNSS observation data and RTK positioning analysis app through smartphone. Kinematic positioning was performed for circular trajectories, and static positioning was performed for address information facilities. The results of comparative analysis with the Static positioning performance of the geodetic receivers were obtained with 5 fixed points in the experimental site, and the good static surveying performance was obtained with the standard deviation of average ±1.2cm. In addition, the results of the test point for the outline of the circular structure in the orthogonal image composed of the drone image analysis and the Kinematic positioning trajectory of the low cost RTK GNSS receiver showed that the trajectory was very close to the standard deviation of average ±2.5cm. Especially, as a result of applying it to address information facilities, it was possible to verify the utility of spatial information construction at low cost compared to expensive commercial geodetic receivers, so it is expected that various utilization of "multi-channel GNSS RTK module positioning system"

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2007.12a
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• pp.90-93
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• 2007

해양수산부에서 해양 DGPS기준국과 연계하여 전국망 위성항법보정시스템 (NDGPS) 구축 사업을 추진 중에 있으며, 2008년도 춘천기준국이 설치 완료되면 우리나라 전역에서 실시간 DGPS 측위 정보를 이용할 수 있게 되었다. 따라서 DGPS 이용 활성화를 위하여 무엇보다도 DGPS 측위 정확도의 신뢰성이 요구되는바, 실시간 DGPS 의 측위 정확도를 측정 ${\cdot}$ 분석하여 신뢰성을 검증하였다. 실시간 NDGPS 측위 정확도는 Static 측정에 있어 0.42m(RMS), 회전운동에 의한 Dynamic 측정시 0.48m(RMS)로 분석되었으며, RTK에 의한 비교 측정 ${\cdot}$ 분석도 병행하였다. 따라서 위성항법보정시스템 (DGPS)은 높은 정확도를 요구하는 GIS구축사업 분야에 직접적으로 이용될 수 없으나 실시간 측위 정보를 필요로 하는 GIS활용 분야에서 DGPS가 다양하게 이용될 수 있을 것이다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.18 no.3
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• pp.271-278
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• 2000

Recently, it has been partly attempted to measure behavior of large-sized bridge using GPS, but it is accomplished at the first step and unsystemically. The purpose of this research is to measure bridge behavior by Kinematic On The Fly (OTF) technique of GPS. The results of this study show that bridge behavior can be measured easily and conveniently in three dimension, monitored at the real time, and measured continuously without a break by OTF Technique of GPS.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.6
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• pp.677-685
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• 2011

In order to enhance public transportation and to maintain information credibility, improvement of accuracy regarding route and positional information of public transport is very significant. There have been a variety of methods using GPS to measure accuracy of location-based services. However, the researches of evaluation regarding kinematic position of linear objects measured by vehicle/kinematic GPS are still insufficient. That's why our paper aims to suggest method of evaluation accuracy on a real-time bus route surveyed by GPS by SBM(Single Buffering Method). To make it come true, we compared the findings on the static and dynamic positioning by using PP(Point Positioning), DGPS and GPS/INS integrated systems and analyzed the accuracy and error effects among them, focusing on Anyang city. Consequently, we can find out that in case of P.P. comparing positioning accuracy between RTK DGPS and GPS/INS, both of them have survey result within a margin of error of 5m. More importantly, we can evaluate positional accuracy of each GPS system based on the work provision of a public survey such as error for P.P.(14.5m, 18.1m), DGPS(16.9m, 18.5m), and GPS/INS(18.4m, 18.5m). We are expecting that proposed method in our paper can be utilized in a wide range of categories such as feasibility testing of GPS field survey and high accuracy of positioning for Bus Information System.

• Journal of Navigation and Port Research
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• v.32 no.8
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• pp.611-619
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• 2008

The Ministry of Land, Transport and Maritime Affairs is working on the construction of Nationwide DGPS(NDGPS) with connection to Maritime DGPS Reference Stations and if Chun-cheon Reference Station is to be completed in 2008, DGPS positioning information is available in the whole area of Republic of Korea. Therefore to promote the usage of DGPS surveying information, we measured and panalyzed the accuracy of DGPS. In real-time DGPS positioning accuracy were 0.42m of planar Root Mean Square(RMS) error in static survey and 0.48m of planar RMS error in dynamic survey. We went abreast with RTK comparison measurement. According to these results. DGPS positioning information cannot be applied directly to the GIS construction field, but GIS application fields, requiring the real-time positioning information. can take advantage of it in variable cases.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.17 no.4
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• pp.373-381
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• 1999

Mobile Mapping System can be defined as vehicle mapping system which collects rapidly spatial data by integrated Gps/digital imaging system. Kinematic positioning by GPS is essential technology of Mobile Mapping System. This paper aims at analysing the accuracy and efficiency of kinematic positioning by GPS platformed on moving vehicle. For the purpose, roads were surveyed by vehicle/kinematic GPS. The results show that vehicle/kinematic GPS can measure spatial position faster, and still maintain a reasonable accuracy. But inertial navigation system and GPS should be integrated to compute continuous vehicle track and overcome gaps by blocked satellite signals for the more accurate positioning.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.65-67
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• 2012

2011년 3월 센다이 앞바다 약 130km지점에서 엄청난 지진해일을 동반한 규모 9.0 초대형 지진이 발생하였다. 많은 지역에서 범람고가 10m를 상회하였으며, 큰 피해가 발생한 곳의 경우 지진해일의 처오름 높이가 23.6m에 달한 곳도 있었다. 이 쓰나미는 지진 발생후 30분만에 첫 번째 지진해일이 해안에 도달하였고, 이 후 수차례 반복하여 내습하였다. 이러한 지진해일의 대책중 하나는 지진해일 발생시 5~10분 이내에 기상청에서 경보를 발령하고 대피 체계를 구축하는 것이다. 이와 같은 이유로 본 연구에서는 지진해일을 검출하기 위한 기저거리 비종속 정밀측위기술을 제안하였다. 원해에서는 기준국과의 위치가 멀기 때문에 DGNSS의 사용이 힘들다. 그러므로 단독 GPS 측위에 영향을 주는 오차를 제거하고 Kalman filter를 이용하여 정확한 위치를 추정한다. 또한 성능 검증을 위한 파랑의 동적특성을 고려한 테스트베드를 개발하였고, 그 유용성을 검증하였다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.441-444
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• 2011

최근 IT분야의 눈부신 발전으로 Web 3.0의 시대를 맞아 유비쿼터스 시대에 점점 다가가고 있다. 그리하여, 일반 이용자도 전문 기술자들의 지식을 인터넷이나 스마트 폰과 같은 통신매체를 통해 쉽게 습득 할 수 있게 되어, 측량과 같은 전문적인 분야도 일반 사용자가 원할 때는 언제, 어디서나 사용할 수 있도록 하기 위해 연구를 진행 하였다. 본 논문의 목적은 전파를 통해 언제, 어디서나, 누구나 지식을 요하지 않아도 정적, 동적 객체 위치 개념의 정보, 해석, 관리 등을 할 수 있는 무선 측위 네트워크를 구축하기 위해, 실내에 무선 네트워크 망을 구성하여, 1차원 또는 2차원, 장애물 투과성, 이동 객체 대상물의 측위를 통하여, U-Surveying을 위한 기초 실험을 하였다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.2D
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• pp.319-327
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• 2009

In order to estimate accurate position by GPS observations, it is prerequisite to define both of the correct function model and the realistic stochastic model. In the case that un-modeled outliers exist in observations, estimates become biased, and their standard deviations are unable to be used as a measure which represents their accuracy. Hence, such outliers should be appropriately removed from the observations before estimating final solutions, so that the accuracy can be maximized with the improvement of the reliability. For this purpose, this research deals with quality control and quality measure computation algorithms for GPS stand-alone positioning. After theoretical studies, all the algorithms have been implemented and tested with real observations. Results of the tests indicate that the reliability of the estimated position is improved by increasing redundancy as well as using good satellite geometry and more realistic stochastic model. Moreover, the adaptation of the quality control procedure enable to improve positioning reliability and accuracy by appropriately excluding outlier in observations.