• The Journal of Korea Robotics Society
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• v.8 no.2
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• pp.129-135
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• 2013

In this paper, a high precision outdoor positioning system is newly proposed using multiple GPS receivers based on the Extended Kalman Filter (EKF). Typically, the GPS signal has the instantaneous errors that degrade the positioning seriously. Using the multiple GPS receivers instead of an expensive DGPS receiver, the positioning reliability and accuracy are improved in this research as a low cost solution. To incorporate the small displacement, an INS data have been tightly coupled to the GPS data, which has the inherit disadvantage of the cumulative error occurring over time. To achieve a stabilized and accurate positioning system, the multiple GPS receiver data are fused with the INS data through the EKF process. Through real navigation experiments of an outdoor mobile robot, the performance of the proposed system has been verified to be accurate comparable to DGPS system with a lower cost.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.256-260
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• 2005

For the structure of AVLS is required to the GPS-MDT for realtime acquisition the position reporting of vehicle and traffic management S/W. It is necessary that the MODEM using VHF transceiver base on GPS and monitoring program for display base on GIS the traffic status by vehicles position report in management system. The other wise, vehicles among management system that is required the automatic communications protocol for GPS information and mobile's ID. In this paper have studied the VHF modem for transmission the voice and data at same time and S/W for management system using GIS-tool.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2075-2077
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• 2001

For precise positioning, GPS carrier measurements are often used. In this case, accurate position having mm${\sim}$cm error can be obtained. For 3D positioning, in CDGPS, more than five carrier phase measurements are required. When GPS signals are blocked or carrier phase measurements are insufficient, it cannot provide positioning solution. By integrating CDGPS with INS, continuity of positioning solution can be guaranteed. However, when a vehicle moves in low speed or in stationary, the CDGPS/INS integrated system is difficult to compensate INS attitude errors because GPS velocity error become relatively lange. In this paper, we used the 3D attitude GPS receiver to compensate the INS attitude error. By field experiments, it is shown that the proposed integration system maintains the navigation performance even when a vehicle is in low speed or GPS signal is blocked for a period of time.

• Journal of Fisheries and Marine Sciences Education
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• v.10 no.1
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• pp.53-62
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• 1998

Accuracy of positions by GPS receiver at Tongyoung Port were measured and analysed in order to get more credible information on GPS positioning for vessels. Positions were automatically recorded every 5-Min from 1st October, 1997 to 30th of November, 1997 by two identical GPS receivers at the Laboratory of Navigation in the College of Marine Science, Gyeongsang University ($34^{\circ}$ 49' 57.985"N, $128^{\circ}$ 24' 06.562") and at the training ship "Gyeongyang" alongside in the tongyoung passenger port ($34^{\circ}$ 50" 10.080"N, $128^{\circ}$ 25' 16.415") as fixed positions. The results are as follows ; 1. Number of the usable satellites observing Zenith angle between $9^{\circ}$ and $82^{\circ}$ was normally 4 during a day 24 hours except for 3 hours with total Number 20. 2. Accuracy of position with time was widely dispersed around center of standard position as well as directional deviation around mean position. 3. Specific error of GPS receiver showed a little deviation by alternative measurements for consecutive 5 days at each fixed position respectively. 4. Accuracy of GPS position at 2 fixed positions of Tongyoung port was revealed 27.2 m as minimum value while normal accuracy for all day could be less than 50 m.

• International Journal of Internet, Broadcasting and Communication
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• v.15 no.3
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• pp.176-184
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• 2023

Points of interest (POIs) are widely used in tourism recommendations and to provide information about areas of interest. Currently, situation judgement using POI and GPS data is mainly rule-based. However, this approach has the limitation that inferences can only be made using predefined POI information. In this study, we propose an algorithm that uses POI data, GPS data, and schedule information to calculate the current speed, location, schedule matching, movement trajectory, and POI coverage, and uses machine learning to determine whether to stay or go. Based on the input data, the clustered information is labelled by k-means algorithm as unsupervised learning. This result is trained as the input vector of the SVM model to calculate the probability of moving and staying. Therefore, in this study, we implemented an algorithm that can adjust the schedule using the travel schedule, POI data, and GPS information. The results show that the algorithm does not rely on predefined information, but can make judgements using GPS data and POI data in real time, which is more flexible and reliable than traditional rule-based approaches. Therefore, this study can optimize tourism scheduling. Therefore, the stay detection algorithm using GPS movement trajectories and POIs developed in this study provides important information for tourism schedule planning and is expected to provide much value for tourism services.

• Journal of Korea Water Resources Association
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• v.56 no.12
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• pp.845-853
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• 2023

Recently, along with the increase in chemical accidents, the number of accidents-related disasters has been increasing continuously since 2012, and when looking at the hydrogen fluoride incident which is a representative example of domestic chemical incidents, there is insufficient technology applicable to the incident site. The result was that the damage spread. Therefore, in this paper, we will adapt the water pollution accident response system to a location-based approach, and introduce a measurement method for alternative index tracking using a GPS electronic floater of a location-based index measurement method for real-time response in the water environment when a chemical incident occurs. The research target area is Gumi City, which is the area where the hydrogen fluoride incident occurred, and Gamcheon is selected, and alternative tracking using GPS electronic floater is conducted in the corresponding target area through water quality and flow measurement. As a result, it is possible to measure water quality and flow at the same time in tracker experiments using GPS electronic floater based on the research results, it is believed that using GPS electronic floater will be of great help in disaster response systems for spill incidents in the river.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2006.04a
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• pp.39-45
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• 2006

This paper describes an effective and fast algorithm for GPS carrier-phase ambiguity resolution (AR) which can apply for structure monitoring, and a series of simulation analyses have been carried out to demonstrate the performance of the algorithm. The results show that single-frequency AR performance is significantly improved In term of Time-To-Fix-First (TTFF) ambiguity.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.2
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• pp.186-193
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• 2006

This paper proposes a DGPS (Differential GPS) mobile reference station. The proposed systems can provide user with real-time correction data when the internet connention is possible. Since the GPS receiver part and network hardware are designed in a module, it can be easily moved and fixed. In order to verify the proposed system, several tersts have been carried out and the test results show the validity of the proposed system.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2009.04a
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• pp.235-236
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• 2009

실시간 공중 자료획득 시스템은 재난 재해와 같은 긴급 상황에서 빠르게 자료를 취득하여 대상 지역의 정사 영상과 같은 공간정보를 취득하는 시스템이다. 이러한 시스템에서 GPS와 INS는 플랫폼의 위치와 자세정보를 획득 하는데 중요한 역할을 하며 이번 연구에서는 GPS/MEMS IMU 센서의 성능 평가를 실측 데이터를 통하여 실시간 공중 자료획득 시스템에 대한 적합성을 평가하였다.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2003.04a
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• pp.467-470
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• 2003

This study tries to introduce the precision measurement of 3-dimensional terrain of reservoir using Echo Sounder and RTK-GPS which is unprecedented in domestic. In this study, to introduce the way to produce the plane figure, the cross section and data of underside reservoir by constructing the 3-dimensional terrain models using 3-Dimensional data gained by measurement.