• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 춘계학술대회
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• pp.297-300
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• 2016

한국에서 제공하고 있는 위성항법보정서비스는 지상 기반의 Differential GNSS 서비스가 대표적이다. 한국은 이 위성항법보정서비스를 확대하기 위해 위성 기반의 위성항법보정시스템을 구축하고 있다. 위성 기반의 위성항법보정시스템은 SBAS(Satellite Based Augmentation System)이라 불린다. SBAS를 운영하기 위해서는 지상 기반의 위성항법보정시스템과 마찬가지로 지상에 SBAS 기준국이 설치되어야 한다. 이 SBAS 기준국은 지상기반의 DGNSS 기준국과 함께 설치될 수 있으며, 이를 위해서는 DGNSS 시스템이 SBAS 기준국용 수신기중 하나인 NovAtel 사의 G-III 수신기와 연동되어야 한다. 이 논문에서는 SBAS 기준국용 수신기인 G-III 수신기와 연동하기 위한 소프트웨어 모듈을 설계하고, 이 모듈을 DGNSS 기준국 시스템에 추가할 수 있도록 RS, IM 소프트웨어의 아키텍처를 변경하였다.

• 한국항공운항학회지
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• 제16권2호
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• pp.12-20
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• 2008

Japanese MSAS (Multi-functional Satellite Augmentation System) satellites have been transmitting GPS satellite orbit and ionosphere correction information since 2005. MSAS coverage includes Far East Asia, and it can improve the accuracy and integrity of GPS position solutions in Korea. This research analyzed the ionosphere correction information from the MSAS ionosphere correction data. The ionosphere delay data observed by a dual frequency receiver is compared with the MSAS ionosphere correction data. The variation of MSAS GIVE values are analyzed in connection with the equatorial anomaly and ionosphere scintillation.

• Journal of Positioning, Navigation, and Timing
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• 제12권4호
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• pp.369-377
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• 2023

This paper presents the analysis results of navigation performance of Korea Augmentation Satellite System (KASS) test signals. Performance analysis was performed with Global Positioning System (GPS) and Satellite Based Augmentation System (SBAS) signals received from 7 KASS reference stations. And the performances were analyzed in terms of the signal strength, statistics for each SBAS message, coverage of ionospheric correction, accuracy, integrity, continuity, and availability. In addition, the navigation solutions provided by commercial receiver was analyzed and the performance experienced by general users was presented. Lastly, directions for further improvement of the KASS system were addressed. These performance analysis results can be used to confirm the feasibility of utilizing KASS in user applications.

• Journal of Positioning, Navigation, and Timing
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• 제2권1호
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• pp.41-48
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• 2013

When the ground subsystem of Ground Based Augmentation System(GBAS) is installed at the airport, the functions and performance of subsystem should be evaluated through ground and flight testing at the pre-commissioning phase. In the case of GBAS flight testing, it can be conducted by the existing flight check aircraft, but the GBAS ground testing requires the development of specially customized equipment to perform the ground testing. Therefore, this paper describes the preliminary design of GBAS onboard test equipment which can be independently used for the GBAS ground testing and flight testing on a car and an aircraft.

• 한국항행학회논문지
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• 제21권6호
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• pp.544-548
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• 2017

국제민간항공기구에서는 전 세계적으로 PBN 이행 촉구를 위해 2025년까지 모든 항공기의 SBAS 사용을 권고하고 있는 상황이다. 이에 국내에서도 한국형 SBAS인 KASS 개발이 진행 중에 있다. ICAO에서는 SBAS에 대한 인증 및 운용에 있어서 해당 항공 당국에 그 권한을 부여하고 있으며, KASS 또한 시스템 상세 설계, 제작, 설치 가 수행된 후 시스템에 대한 검증이 이루어 질 예정이다. 이에 본 논문에서는 국제 표준의 비행검사 규정을 통해 비행시험 파라미터를 도출 하였으며 이를 측정하기 위한 탑재측정장비의 구성방안에 대해서 제안 하였다.

• 한국위성정보통신학회논문지
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• 제8권1호
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• pp.40-44
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• 2013

본 논문에서는 지상용 GPS(Global Positioning System)와 유사한 GBAS(Ground Based Augmentation Systems)의 위치측정오차에 대해서 연구하였다. GBAS의 위치측정오차에 영향을 주는 요소는 많이 있으며 측위오차(DOP: Dilution Of Precision)도 그 중의 하나이다. 측위오차는 송신기와 수신기의 수와 기하학적 배치위치에 따라서 결정된다. 본 연구에서는 한반도 지형에 2-열로 송신기를 배치하고 수신기의 위치에 따른 고도별 DOP를 예측할 수 있는 알고리즘을 개발하였다. 본 논문은 송신기와 수신기가 배치된 3차원 공간의 DOP를 정확하게 예측할 수 있어서 항법시스템에 매우 유용하게 사용될 수 있을 것으로 판단된다.

• 한국군사과학기술학회지
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• 제14권5호
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• pp.798-804
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• 2011

A number of navigation improvements are envisaged : Differential GPS - WAAS, LAAS, and Performance Based Navigation. The GPS receiver verifies the integrity(usability) of the signals received from the GPS constellation through a process called receiver autonomous integrity monitoring(RAIM) to determine if a satellite is providing corrupted information. This paper describe the RAIM function and Performance-Based Navigation implementation of Mission Equipment Package(MEP) for Korean Utility Helicopter.

• 대한공간정보학회지
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• 제19권3호
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• pp.75-82
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• 2011

본 연구에서는 기존 위성항법시스템의 경우 고가의 장비보유, 통신장애에 따른 이용의 제한 등의 단점을 보완할 수 있는 광역보정위성항법시스템인 위성기반보정시스템(SBAS: Satellite Based Augmentation System)의 하나인 OmniSTAR의 개요, 고정해에의 수렴시간(convergence time)을 분석한 결과, 동적모드(Dynamic mode)에서 약 39분, 정적모드(Static mode)에서 약 28분 소요되는 것으로 나타났다. 본 연구의 성과는 높은 정확도를 요구하지 않는 위치기반서비스(LBS: Location Based Service) 분야, 모바일 측위분야, 공간정보산업분야에 활용될 수 있을 것으로 사료된다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.165-170
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• 2006

In the Civil Aviation field, the international trend (through ICAO, EUROCONTROL) is to adopt one positioning system that allows to follow more flight phases. This will allow to release themselves by ground installations and optimize the traffic flows following the aRea Navigation (RNAV) concept. In order to realize this goal the European Scientific Community are focusing on Augmentation Systems based on Satellite infrastructure (SBAS - Satellite Based Augmentation System) and on Ground based ones (GBAS - Ground Based Augmentation System). The goal of this work is to present some results on SBAS and GBAS performances. Regarding SBAS, the Department of Applied Sciences of Parthenope University, after the acquisition of a Novatel OEM4 SBAS receiver has created a monitoring station that reflect as much as possible a standardized measure environment for EGNOS Data Collection Network (EDCN), established by Eurocontrol. The Department of Applied Science has decided to carry out a own monitoring survey to verify the performance of EGNOS that can be achieved in South Europe region, a zone not very covered by official (EDCN) monitoring network. Regarding GBAS, we started from a data set of measurements carried out at the GBAS of Milan-Linate airport where we work on a ground installation (GMS - Ground Monitoring Station) that supervises the GBAS signal and that represent, for our purposes, the Aircraft subsystem. So the set of data collected is to be considered in RTK mode and after the measures session we processed them with the software PEGASUS v 4.11. Both experiences give us the possibility to evaluate the GNSS1 performance that can be achieved.

• Journal of Positioning, Navigation, and Timing
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• 제7권4호
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• pp.267-275
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• 2018

The reference stations in a satellite-based augmentation system (SBAS) collect raw data from global navigation satellite system (GNSS) to generate correction and integrity information. The multipath signals degrade GNSS raw data quality and have adverse effects on the SBAS performance. The currently operating SBASs (WAAS and EGNOS, etc.) survey existing commercial equipment to perform multipath assessment around the antennas. For the multi-path assessment, signal power of GNSS and multipath at the MEDLL receiver of NovAtel were estimated and the results were replicated by a ratio of signal power estimated at NovAtel Multipath Assessment Tool (MAT). However, the same experiment environment used in existing systems cannot be configured in reference stations in Korean augmentation satellite system (KASS) due to the discontinued model of MAT and MEDLL receivers used in the existing systems. This paper proposes a test environment for multipath assessment around the antennas in KASS Multipath Assessment Tool (K-MAT) for multipath assessment. K-MAT estimates a multipath error contained in the code pseudorange using linear combination between the measurements and replicates the results through polar plot and histogram for multipath assessment using the estimated values.