• Title/Summary/Keyword: GPS측량

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Development of Bridge Warning System by Using GPS Surveying Method (GPS측량기법을 이용한 교량경보시스템 개발)

  • 서동주;노태호;이종출
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.20 no.4
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    • pp.415-421
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    • 2002
  • A recently lot of facilities have been constructed from rapidly development of science and economic growth. Among them, bridges are tending to be large because of geometrical problems of the road. And then the method of satellite surveying is being practical use variously out of present surveying methods. Therefore in this study it takes a measurement of bridge displacement using the RTK GPS Mode instead of the using mechanical measurement system. The observation value was verified by using Total Station to inspect observation value of RTK GPS. And then, by using the Delphi of object intending language, developed bridge warning system and applied it. The result of this study was found verification error of 0.2~8.3mm, therefore the measurement of bridge displacement of grand bridge can be applied by using An GPS.

Application Method of Site Calibration Function of Network RTK Survey for Local Coordinate System Result Analysis (지역좌표계 성과분석을 위한 네트워크 RTK측량 사이트 캘리브레이션 기능 적용 방안)

  • Shin, Chang Soo;Choi, Yun Soo;Park, Moon Jae
    • Journal of Cadastre & Land InformatiX
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    • v.47 no.1
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    • pp.95-110
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    • 2017
  • The network RTK surveying has been widely used in the field of cadastral surveys in recent years, and its use is gradually expanding. As a result of the implementation of GPS static surveys by civilian companies in accordance with the progress of the cadastral surveys and gradual civilian transfer plans and cadastral surveys, there has been an increase in the number of civilian companies performing surveys. In this paper, we describe the process of applying the results of analysis of conformity using the network RTK site calibration function on the local coordinate system to the GPS static surveying of the cadastral reference points in Anyang city. In addition, the measurement results of the network RTK site calibration function and the results of the GPS static surveying network reconciliation in the local coordinate system were compared, and the performance was determined within 0.04m maximum of RMSE(Root Mean Square Error), and further study on the application method is needed.

The Accuracy Analysis of RTK-GPS by Field Calibration in Plane Surveying (국지측량에서의 현장 Calibration에 의한 RTK-GPS 정확도 분석)

  • Park, Woon-Yong;Shin, Dong-Soo
    • Journal of Korean Society for Geospatial Information Science
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    • v.10 no.2 s.20
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    • pp.87-95
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    • 2002
  • Real-time Kinematic GPS enables high accuracy Positioning by real time. If ambiguity use an integer solution, can obtain accuracy of several 'mm', and can obtain accuracy of tens 'em' if use real solution. In this study, We accomplish surveying by existent traditional surveying techniques (Total Station), Static GPS techniques and RTK-GPS techniques by Field Calibration about uniformity measuring point and then compared and ana1yzed each techniques positioning accuracy etc.. Result that achieve by Static-GPS in Plane area, about all measuring points, expressed error fewer than 3cm. Result that achieve RTK-GPS Surveying by Field Calibration in Plane area, could know that RTK-GPS techniques by Field Calibration is available in Plane area because expressing errors fewer than all 6cm, except case that do not get fixed solution of ambiguity Field Calibration RTK-GPS could know economically than existent conventional type measurement and existent GPS's measurement techniques that efficiency is very high.

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Analysis of 3 Dimension Topography by Real-Time Kinematic GPS Surveying (RTK GPS 측량에 의한 3차원 지형 해석)

  • 신상철;서철수
    • Spatial Information Research
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    • v.9 no.2
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    • pp.309-324
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    • 2001
  • To apply the real-time kinematic GPS surveying technique, this research has tried to obtain the TOKYO datum first from the continuous reference stations distributed all over the country. Then, analysis of the geography of a coastal area including both of land and sea has been carried out by the post-processed continuous kinematic GPS technique and the real-time kinematic GPS surveying technique. After considering the initial conditions and measuring time zone for real-time kinematic GPS, post-processed and the real-time kinematic GPS measurements have been carried out. A new system has been proposed to store measured data by using a program developed to store GPS data in real time and to monitor the satellite condition through controller simultaneously. The accuracy of GPS data acquired in real time was as good as that acquired by post processing. It is expected that it will be useful for the analysis of coastal geographic characteristics because DTM can be also constructed for the harbor reclamation, the dredging and the variation of soil movement in a river.

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The Study about Accuracy Kinematic GPS Survey (정확한 동적 GPS 측량에 관한 연구)

  • 박운용;이종출;이인수;나종기
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2004.04a
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    • pp.45-49
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    • 2004
  • The Navstar Global Positioning System(GPS) is an advanced navigation satelite system for determination of position, velocity and time. It can provide three-dimensional positioning on a global basis, independent of weather, 24 hours per day. Test results show that the carrier phase and pseudorange corrections are suitable for a kinematic GPS system. Using these corrections are more effective than using raw GPS data, since fewer bits are required for transmission Additionally, the number of computation required at the rover is reduced when corrections, rather than raw measurement are transmitted

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A Study on Accuracy Enhancement of Low Cost GPS Receiver for Navigation (Navigation을 위한 저가 GPS 수신기 정확도 향상을 위한 연구)

  • 강준묵;조성호;임태형;강기석
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2003.04a
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    • pp.433-441
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    • 2003
  • 최근 SA(Selective Availability)의 해제에 따른 GPS의 활용이 증대되면서 차량운행에 있어서도 저가 GPS 수신기의 활용이 활발하게 이루어지고 있으며, 일반 차량 운행자를 위한 상용화가 급속도로 이루어지고 있다. 하지만 저가 GPS수신기를 통한 실시간 위치정보의 제공은 실질적으로 상당한 오차를 포함하고 있다. 이는 저가 수신기가 가지고 있는 문제라 할 수 있다. 이에 본 연구에서는 저가 수신기와 정밀 측위용 이주파 수신기를 이용하여 측지분야에서 검증된 GPS측량방법을 통해 오차를 비교ㆍ분석하고 저가 수신기의 정확도 향상을 위한 방법을 제시하고자 하였다.

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The Effective Means to Promote GPS-Based Survey for Cadastral Surveying of GPS Performance Standards and Measures (GPS기반의 효율적인 지적측량성과를 위한 측량기준 및 방안에 대한 연구)

  • Ahn, Jong Soon;Kang, Joon Mook;Yun, Hee Cheon
    • Journal of Korean Society for Geospatial Information Science
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    • v.21 no.1
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    • pp.65-75
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    • 2013
  • In this study, one of the main aims is to build up a technical foundation for promoting the cadastral resurvey effectively and to improve the accuracy of cadastral surveying is to make use of precise surveying techniques in allowance of position errors as reference accuracy in cadastral resurvey, which is proper to obtain the sufficient accuracy of the cadastral control points, and parcel boundary points by introducing the GNSS-based surveying techniques on cadastral survey. In detail, the existing procedures and outcomes of cadastral survey were compared and analyzed for suggesting a better survey technique than that of the other techniques in a variety of aspects of capability of cadastral survey. The new skills and supports could be upmost importance when doing cadastral survey. What's more, essentially, 'The Measurement Department' makes all the efforts to establish 'The Surveying Regulations'. This could possibly apply GNSS-based surveying technique to the cadastral resurvey for the foreseeable future and this research paper suggested that how to improve absolute accuracy of cadastral reference points by means of putting to use the appropriate models of measurement further.

A Study on Application of GPS CORS Based on VRS Concept (VRS 개념에 기반한 GPS 상시관측소 활용 연구)

  • 박운용;이용희;곽두호;배경호
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2003.10a
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    • pp.109-113
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    • 2003
  • GPS 상시관측소의 활용과 중요성은 GPS측량에서 폭넓은 사용과 비교적 높은 정확도를 충족시키는 방안으로 점점 가치를 더 하고 있다. 현재 RINEX 포맷 형태로 인터넷 서비스를 하고 있는 GPS 상시관측소의 자료를 이용하여 기준점으로써의 가치를 평가하고 또한 시간과 경비를 줄일 수 있는 방법인 VRS-GPS기법을 연구하고자 한다. 본 연구에서는 임의의 기준국을 설치하여, 기존 삼각점과 GPS 상시관측소를 이용해 관측망을 형성, 그 결과를 비교 고찰하였으며 이 기준국을 RTK-GPS의 고정국으로 하여 실시간 측위를 하였다. 고정국은 전자 가상 기준국인 VRS-RTK 개념으로 가정하고 비교, 검증하였다.

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Block Adjustment with GPS/INS in Aerial Photogrammetry (GPS/INS에 의한 항공사진측량의 블럭조정)

  • 송연경;박운용;이재원;김정희
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2004.04a
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    • pp.39-44
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    • 2004
  • In this thesis, two test flights were conducted in Gwacheon and Suwon area to evaluate the performance of accuracy and efficiency through the analysis of results among the three photogrammetric methods, that is, traditional photogrammetry, GPS -Photogrammetry and GPS/INS-Photogrammetry. Test results shows that a large variety of advantages of GPS-Photogrammetry and GPS/INS-Photogrammetry against traditional photogrammetry is to be verified. Especially, the number of ground control points for the exterior orientation could be saved more than 70-80%, and the cost for map production 30-50%, respectively. In addition, it was convinced that the large reduction of control points has not any effect on the block accuracy. It was also proved that the number of required ground control points for GPS/INS-Photogrammetry, is similar to that of GPS-Photogrammetry. Therefore it should be noted that GPS -Photogrammetry is more efficient in the aspect of reduction of mapping cost against GPS/INS-Photogrammetry, installing only an existing GPS receiver on survey aircraft to avoid high economic burden of procurement for integrated GPS/INS equipment.

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GPS/INS AT(Aerial Triangulation) Evaluation According to GPS Processing Time (GPS 위성신호의 처리시간에 따른 GPS/INS 사진기준점측량의 정확도)

  • Lee Seung-Huhn;Wie Gwang-Jae;Kim Seung-Young;Lee Jae-Won
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2006.04a
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    • pp.151-158
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    • 2006
  • As GPS 'selective availability' was turned off in 2000, GPS related fields and markets are explosively extended. In mapping area, GPS/INS aided photogrammetry proved it is much cost and time effective method keeping enough accuracy as compared with traditional photogrammetry works. The advantage of GPS/INS integration is interdependence. Even if GPS signal was blocked in some time, the position accuracy is not affected. In this study, various GPS signal time gap was used in GPS/INS AT process. Field surveyed ground points were used in accuracy check with GPS/INS AT check points. And the result showed enough accuracy of photogrammetry work rule of NGII. y.

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