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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Positioning, Navigation, and Timing
Journal Basic Information
Journal DOI :
The Korean GNSS Society
Editor in Chief :
Volume & Issues
Volume 3, Issue 4 - Dec 2014
Volume 3, Issue 3 - Sep 2014
Volume 3, Issue 2 - Jun 2014
Volume 3, Issue 1 - Mar 2014
Selecting the target year
Estimation of Angular Acceleration By a Monocular Vision Sensor
Lim, Joonhoo ; Kim, Hee Sung ; Lee, Je Young ; Choi, Kwang Ho ; Kang, Sung Jin ; Chun, Sebum ; Lee, Hyung Keun ;
Journal of Positioning, Navigation, and Timing, volume 3, issue 1, 2014, Pages 1~10
DOI : 10.11003/JPNT.2014.3.1.001
Recently, monitoring of two-body ground vehicles carrying extremely hazardous materials has been considered as one of the most important national issues. This issue induces large cost in terms of national economy and social benefit. To monitor and counteract accidents promptly, an efficient methodology is required. For accident monitoring, GPS can be utilized in most cases. However, it is widely known that GPS cannot provide sufficient continuity in urban cannons and tunnels. To complement the weakness of GPS, this paper proposes an accident monitoring method based on a monocular vision sensor. The proposed method estimates angular acceleration from a sequence of image frames captured by a monocular vision sensor. The possibility of using angular acceleration is investigated to determine the occurrence of accidents such as jackknifing and rollover. By an experiment based on actual measurements, the feasibility of the proposed method is evaluated.
A Preliminary Study of Korean Dual-Frequency SBAS
Yun, Ho ; Han, Deokhwa ; Kee, Changdon ;
Journal of Positioning, Navigation, and Timing, volume 3, issue 1, 2014, Pages 11~16
DOI : 10.11003/JPNT.2014.3.1.011
A Satellite Based Augmentation System (SBAS) is a representative differential GNSS system, which is used for the navigation performance improvement of Global Navigation Satellite System (GNSS) users. SBAS has been developed focusing on the securement of user integrity so that it can be used for the navigation in aviation fields. Accordingly, the development of SBAS has been completed, and it has been actively used in the United States, Europe, and Japan. As the new satellite of Global Positioning System (GPS) recently started to broadcast new civil signals (L5 frequency), the methods for improving user navigation performance in SBAS using this signal have also been studied. In Korea, to keep pace with these circumstances, full-scale SBAS development is expected to start in 2014, and studies on dual-frequency SBAS using L1/L5 frequencies will also be performed. In this study, before the full-scale development of dual-frequency SBAS in Korea, a simulation was performed to predict the performance and analyze the expected effects.
Considerations on Ionospheric Correction and Integrity Algorithm for Korean SBAS
Bang, Eugene ; Lee, Jiyun ;
Journal of Positioning, Navigation, and Timing, volume 3, issue 1, 2014, Pages 17~23
DOI : 10.11003/JPNT.2014.3.1.017
Satellite Based Augmentation Systems (SBAS) provide ionospheric corrections at geographically five degree-spaced Ionospheric Grid Points (IGPs) and confidence bounds, called Grid Ionospheric Vertical Errors (GIVEs), on the error of those corrections. Since the ionosphere is one of the largest error sources which may threaten the safety of a single frequency Global Navigation Satellite System (GNSS) user, the ionospheric correction and integrity bound algorithm is essential for the development of SBAS. The current single frequency based SBAS, already deployed or being developed, implement the ionospheric correction and error bounding algorithm of the Wide Area Augmentation System (WAAS) developed for use in the United States. However, the ionospheric condition is different for each region and it could greatly degrade the performance of SBAS if its regional characteristics are not properly treated. Therefore, this paper discusses key factors that should be taken into consideration in the development of the ionospheric correction and integrity bound algorithm optimized for the Korean SBAS. The main elements of the conventional GIVE monitor algorithm are firstly reviewed. Then, this paper suggests several areas which should be investigated to improve the availability of the Korean SBAS by decreasing the GIVE value.
A Feasibility Test on the DGPS by Correction Projection Using MSAS Correction
Yoon, Dong Hwan ; Park, Byungwoon ; Yun, Ho ; Kee, Changdon ;
Journal of Positioning, Navigation, and Timing, volume 3, issue 1, 2014, Pages 25~30
DOI : 10.11003/JPNT.2014.3.1.025
Differential Global Positioning System-Correction Projection (DGPS-CP) algorithm, which has been suggested as a method of correcting pre-calculated position error by projecting range-domain correction to positional domain, is a method to improve the accuracy performance of a low price GPS receiver to 1 to 3 m, which is equivalent to that of DGPS, just by using a software program without changing the hardware. However, when DGPS-CP algorithm is actually realized, the error is not completely eliminated in a case where a reference station does not provide correction of some satellites among the visible satellites used in user positioning. In this study, the problem of decreased performance due to the difference in visible satellites between a user and a reference station was solved by applying the Multifunctional Transport Satellites (MTSAT) based Augmentation System (MASA) correction to DGPS-CP, instead of local DGPS correction, by using the Satellite Based Augmentation System (SBAS) operated in Japan. The experimental results showed that the accuracy was improved by 25 cm in the horizontal root mean square (RMS) and by 20 cm in the vertical RMS in comparison to that of the conventional DGPS-CP.
Development of a Combined GPS/GLONASS PPP Method
Choi, Byung-Kyu ; Roh, Kyoung-Min ; Lee, Sang Jeong ;
Journal of Positioning, Navigation, and Timing, volume 3, issue 1, 2014, Pages 31~36
DOI : 10.11003/JPNT.2014.3.1.031
Precise Point Positioning (PPP) is a stand-alone precise positioning approach. As the quality of satellite orbit and clock products from analysis centers has been improved, PPP can provide more precise positioning accuracy and reliability. A combined use of Global Positioning System (GPS) and Global Orbiting Navigation Satellite System (GLONASS) in PPP is now available. In this paper, we explained about an approach for combined GPS and GLONASS PPP measurement processing, and validated the performance through the comparison with GPS-only PPP results. We also used the measurement obtained from the GRAS reference station for the performance validation. As a result, we found that the combined GPS/GLONASS PPP can yield a more precise positioning than the GPS-only PPP.