• Title, Summary, Keyword: 네트워크 RTK

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Design of Monitoring System for Network RTK (네트워크 RTK 환경에 적합한 감시 시스템 설계)

  • Shin, Mi-Young;Han, Young-Hoon;Ko, Jae-Young;Cho, Deuk-Jae
    • Journal of Navigation and Port Research
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    • v.39 no.6
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    • pp.479-484
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    • 2015
  • Network RTK is a precise positioning technique using carrier phase correction data from reference stations within the network, and is constantly being researched for improved performance. However, the study for the system accuracy has been performed but system integrity research has not been done as much as system accuracy, because network RTK has been mainly used on surveying for static or kinematic positioning. In this paper, adequate monitoring system for network RTK is designed as basis research for integrity monitoring on network RTK. To this, fault tree on network RTK is analyzed, and a countermeasure is prepared to detect and identify the each fault items. Based these algorithms, monitoring system to use on central processing facility is designed for network RTK service.

A Study on the Site Calibration of Network RTK Surveying (네트워크 RTK 측량의 사이트 캘리브레이션 방안에 관한 연구)

  • Choi, Han Jun;Lee, Byoungkil;Yeon, Sang Ho
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.31 no.1
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    • pp.99-107
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    • 2013
  • With the expansion of the development and use of surveying equipment recently, by the establishment of infrastructure for network RTK surveying of the NGII, network RTK surveying has been widely used in surveying industry. Currently, in public surveying regulations, site calibration with minimum 5 evenly spaced bench marks is needed for using network RTK surveying results as leveling. But the range between and the number of bench marks for site calibration can be varied according to the geoid undulation. In this study, in order to verify this, Incheon area having regular geoid undulation and Taebaek area having irregular geoid undulation are selected as study area and network RTK surveying have been done. Then the accuracy of site calibration by range between and the number of bench marks have been compared. As a result of this study, in order to meet a tolerance of vertical precision (0.1m) that has been set in public surveying regulations, there is a necessity for improving the regulations so that the range and number of bench marks, to be used for site calibration of network RTK surveying, can be applied complementarily.

A Study on Accuracy Evaluation and Accuracy Improvement in Cadastral Re-survey Surveying Method (지적재조사 측량방법의 정확도 비교 및 정확도 향상방안 연구)

  • Lee, Suk Bae;Auh, Su Chang;Suh, Yong Woon
    • Journal of Korean Society for Geospatial Information System
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    • v.22 no.4
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    • pp.39-46
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    • 2014
  • Network RTK GNSS positioning technique which has been developed to overcome the limitation of Single reference station RTK is used widely in the field of general surveying, cadastre surveying and engineering surveying due to the high accuracy and efficiency. It is specified Network RTK, Single reference station RTK and Static of GNSS as a surveying method in the regulation of Cadastre Re-survey Surveying. In this study, Network RTK and Static GNSS surveying were accomplished at cadastral re-survey field in Hadong, Gyeongnam and the surveying results were compared. Also, to analyze the performance of site calibration in Network RTK surveying, two types of Network RTK surveying with and without site calibration were accomplished and the results was compared. The research result shows that average positioning error between Network RTK(VRS) without site calibration and Static surveying result is 2.44cm and 1.53cm respectively and average positioning error between Network RTK(VRS) with site calibration and Static surveying result is 0.19cm and 0.82cm respectively at two zone. So, it was proved the effect of calibration in network RTK(VRS) surveying.

Effect of Tropospheric Delay Irregularity in Network RTK Environment (기준국 간 대류권 지연 변칙이 네트워크 RTK에 미치는 영향)

  • Han, Younghoon;Ko, Jaeyoung;Shin, Mi-Young;Cho, Deuk-Jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.11
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    • pp.2569-2575
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    • 2015
  • Network RTK generally uses a linear interpolation method by using the corrections from reference stations. This minimizes the spatial decorrelation error caused by the increase of distance between the reference station's baseline and user's baseline. However, tropospheric delay, a function of the meteorological data can cause a spatial decorrelation characteristic among reference stations within a network by local meteorological difference. A non-linear characteristic of tropospheric delay can deteriorate Network RTK performance. In this paper, the modeling of tropospheric delay irregularity is made from the data when the typhoon is occurred. By using this modeling, analyzing the effect of meteorological difference between reference stations on correction is performed. Finally, we analyze an effect of non-linear characteristics of tropospheric delay among reference stations to Network RTK user.

A Study on Utilization of NTRIP Data Delivery and Virtual RINEX from Seoul Metro Government Network-RTK System (서울특별시 네트워크 RTK 시스템의 NTRIP 데이터 전송 및 Virtual RINEX의 활용)

  • Gwak, In-Sun;Nam, Dae-Hyun;Kwon, Jay-Hyoun
    • Spatial Information Research
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    • v.18 no.5
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    • pp.1-11
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    • 2010
  • Since January 2009, Seoul Metro Government(SMG) is operating own Network RTK Systems connecting four(4) GNSS Reference Stations which are installed inside Seoul Metro City area. SMG is currently providing VRS data service via wireless internet for Network-RTK and RINEX data observed from GNSS Reference Stations. This paper will discuss utilization of data available from SMG Network-RTK System for various applications, and present the test results on practicalities of Virtual RINEX data. For the utilization of data available from SMG Network- RTK system, 1)NTRIP data delivery of GNSS realtime observables streaming and converting to RINEX at receiving side, 2) monitoring deformation of bulky structures using GNSS observation were discussed. In addition to those discussion, 3) broadcasting VRS correction data for job site via radio modem after acquiring such correction data on-line using NTRIP based GNSS Internet Radio from SMG Network-RTK System were introduced. For the test results on practicalities of Virtual RINEX data, 1) the post-processing results of the GNSS observation data on a certain point with GNSS Reference Station data have been compared to the post-processing results of Virtual RINEX data on the same point generated from SMG Network-RTK System, and 2) VRS RTK positioning results for a certain point and post-processing results of Virtual RINEX data for the point were compared. The results showed only a few mm difference, and the high possibility for using Virtual RINEX data for post-processing applications.

Accuracy Evaluation of the Height Determined by Network-RTK VRS Positioning (네트워크 RTK VRS 측량에 의한 표고정확도 평가)

  • Lee, Suk Bae
    • Journal of Korean Society for Geospatial Information System
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    • v.21 no.4
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    • pp.55-63
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    • 2013
  • Network-RTK GPS positioning technique based on national CORS(Continuous Operating Reference Station) and wireless internet access as like VRS and FKP was developed to overcome the limitations of traditional RTK technique. In Korea, NGII(National Geographic Information Institute) provides network-RTK service based on 51 CORS and mobile internet network. The purpose of this study is the accuracy evaluation of the height determined by GPS VRS technique based on network-RTK, So, in this study GPS VRS positioning was accomplished through 1st level BM line located at Sancheong~Jinju and $2^{nd}$ level BM line located at Geochang~Sancheong and the average error of the each BM line was calculated as 2.15cm and 1.80cm respectively. This result shows that GPS VRS height positioning can be used in $3^{rd}$ and 4th public BM leveling and also work regulation is needed to apply the GPS VRS height positioning.

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.

A Study on Utilization of NTRIP Data Delivery and Virtual RINEX available from Seoul Metro Government Network-RTK system (서울특별시 네트워크 RTK 시스템의 NTRIP 데이터 전송 몇 Virtual RINEX의 활용 방안 연구)

  • Nam, Dae-Hyun;Kim, Jin-Hwan;Gwak, In-Sun;Kwon, Jay-Hyoun
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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    • pp.152-155
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    • 2010
  • 본 연구에서는 서울특별시 네트워크 RTK 시스템의 활용 및 Virtual RINEX 실용성 검토를 위해 수행하였다. 네트워크 RTK 시스템의 활용 다양화를 위해서는 NTRIP을 통하여 타기관의 사용자 시스템으로 실시간 전송, 시설물의 변위에 대한 GNSS로 모니터링 방법, GNSS Internet Radio Client와 Radio Modem을 이용한 RTK측위를 소개하고, Virtual RINEX 실용성 검토는 VRS RTK 측위 결과와 이동국 측위 지점에 대한 Virtual RINEX 데이터의 후처리 성과를 비교하였다. 그 결과, Virtual RINEX와 GPS 관측 성과는 거의 동일하여 향후 Virtual RINEX도 후처리 데이터로 사용할 수 있는 가능성을 확인하였고, VRS RTK 측위 성과는 Virtual RINEX 후처리 성과와 수 mm 이내 차이를 보여 산출된 성과가 거의 같음을 확인할 수 있었다.

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Accuracy Evaluation of VRS RTK Surveys Inside the GPS CORS Network Operated by National Geographic Information Institute (국토지리정보원 VRS RTK 기준망 내부 측점 측량 정확도 평가)

  • Kim, Hye-In;Yu, Gi-Sug;Park, Kwan-Dong;Ha, Ji-Hyun
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.26 no.2
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    • pp.139-147
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    • 2008
  • The positioning accuracies tend to deteriorate as the distance between the rover and the reference station increases in the Real-Time Kinematic (RTK) surveys using Global Positioning System (GPS). To solve this problem, the National Geographic Information Institute (NGII) of Korea has installed Virtual Reference System (VRS), which is one of the network-based RTK systems. In this study, we conducted the accuracy tests of the VRS-RTK surveys. We surveyed 50 control points inside the NGII's GPS Continuously Operating Reference Stations (CORS) network using the VRS-RTK system, and compared the results with the published coordinates to verify the positioning accuracies. We also conducted the general RTK surveys at the same control points. The results showed that the positioning accuracy of the VRS-RTK was comparable to that of the general RTK, because the horizontal positioning accuracy was 3.1 cm while that of general RTK was 2.0 cm. Also the vertical positioning accuracy of VRS-RTK was 6.8 cm.

Study On Generating Compact Network RTK Corrections Considering Ambiguity Level Adjustment Among Reference Station Networks for Constructing Infrastructure of Land Vehicle (육상교통 인프라 구축을 위한 다중 네트워크 간 미지정수 수준 조정이 고려된 Compact Network PTK 보정정보 생성기법 연구)

  • Song, June-Sol;Park, Byung-Woon;Kee, Chang-Don
    • The Journal of Advanced Navigation Technology
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    • v.17 no.4
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    • pp.404-412
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    • 2013
  • Network RTK is widely used especially for static applications so far, however, the demand for high accuracy positioning for kinetic users such as land vehicles is growing for safety and convenience reasons. Kinematic users move along the roads and the network where they receive corrections can be changed. Compact Network RTK corrections should keep consistency while network change. In this paper, we introduced a method of generating Compact Network RTK corrections considering network ambiguity level adjustment by formulation of corrections. We verified the proposed method for reference station networks across whole country. We also generated Compact Network RTK corrections using simulation and real GPS data from reference stations in South Korea and evaluated performance of users. As a result, the discontinuity between corrections from two networks reduced to 0.25 cycle from several cycles. And user could achieve less than 8 cm (2DRMS) horizontal position accuracy continuously regardless of network change.