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Orbit Ephemeris Failure Detection in a GNSS Regional Application
Ahn, Jongsun,Lee, Young Jae,Won, Dae Hee,Jun, Hyang-Sig,Yeom, Chanhong,Sung, Sangkyung,Lee, Jeong-Oog The Korean Society for Aeronautical and Space Scie 2015 International Journal of Aeronautical and Space Sc Vol.16 No.1
To satisfy civil aviation requirements using the Global Navigation Satellite System (GNSS), it is important to guarantee system integrity. In this work, we propose a fault detection algorithm for GNSS ephemeris anomalies. The basic principle concerns baseline length estimation with GNSS measurements (pseudorange, broadcasted ephemerides). The estimated baseline length is subtracted from the true baseline length, computed using the exact surveyed ground antenna positions. If this subtracted value differs by more than a given threshold, this indicates that an ephemeris anomaly has been detected. This algorithm is suitable for detecting Type A ephemeris failure, and more advantageous for use with multiple stations with various long baseline vectors. The principles of the algorithm, sensitivity analysis, minimum detectable error (MDE), and protection level derivation are described and we verify the sensitivity analysis and algorithm availability based on real GPS data in Korea. Consequently, this algorithm is appropriate for GNSS regional implementation.
Orbit Ephemeris Failure Detection in a GNSS Regional Application
Jongsun Ahn,Young Jae Lee,Dae Hee Won,Hyang-Sig Jun,Chanhong Yeom,Sangkyung Sung,Jeong-Oog Lee 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.1
To satisfy civil aviation requirements using the Global Navigation Satellite System (GNSS), it is important to guarantee system integrity. In this work, we propose a fault detection algorithm for GNSS ephemeris anomalies. The basic principle concerns baseline length estimation with GNSS measurements (pseudorange, broadcasted ephemerides). The estimated baseline length is subtracted from the true baseline length, computed using the exact surveyed ground antenna positions. If this subtracted value differs by more than a given threshold, this indicates that an ephemeris anomaly has been detected. This algorithm is suitable for detecting Type A ephemeris failure, and more advantageous for use with multiple stations with various long baseline vectors. The principles of the algorithm, sensitivity analysis, minimum detectable error (MDE), and protection level derivation are described and we verify the sensitivity analysis and algorithm availability based on real GPS data in Korea. Consequently, this algorithm is appropriate for GNSS regional implementation.
Development of Prototype Reference Station and Integrity Monitors (RSIM) for Maritime Application
Jongsun Ahn,Kyungho Yoo,Deuk Jae Cho,Sang Hyun Park,Sangkyung Sung,Taesam Kang,Young Jae Lee 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
IMO (International Maritime Organization) and IALA (International Association of Marine Aids to Navigation and Lighthouse Authorities) recommend establish the maritime DGPS (Differential GPS) for ship safety located in coast and narrow channel using GNSS (Global Navigation Satellite System). This paper analysis RSIM (Reference Stations and Integrity Monitors) prototype fault detection system and verify RSIM prototype performance.
Ionospheric Storm Detection Method Using Multiple GNSS Reference Stations
Ahn, Jongsun,Lee, Sangwoo,Heo, Moonbeom,Son, Eunseong,Lee, Young Jae The Institute of Positioning 2019 Journal of Positioning, Navigation, and Timing Vol.8 No.3
In this work, we propose detection method for ionosphere storm that occurs locally using widespread GNSS reference stations. For ionosphere storm detection, we compare ionosphere condition with other reference stations and estimate direction of movement based on ionosphere time variation. The method use carrier phase measurement of dual frequency, for accuracy and precision of test statistics, are evaluated with multiple GNSS reference stations data.
An Efficient GPS Parameter Prediction Method using GPS Ephemeris Patterns for Self-Assisted GPS
Jongsun Ahn,Ha Yeong Song,Sangkyung Sung,Jin-bok Kim,Young Jae Lee 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Ephemeris parameters in navigation message data which are updated every 2 hours has irregular patterns, But in this works, we discovered regular patterns in 24h interval some ephemeris parameters (Semi-Major Axis, Eccentricity, Mean Motion, Inclination Angle, Rate of Inclination Angle, Harmonic Perturbation Terms). In this paper, we evaluate the ephemeris parameter estimation algorithms for SA-GPS using 24h interval GPS ephemeris patterns. Using 24hours ephemeris parameter regular patterns, we propose simple estimation methods (Polynomial method, Sine estimation method) for estimation of current ephemeris parameters.
Jongsun Ahn,Rosihan,Dae Hee Won,Young Jae Lee,Gi Wook Nam,Moon-Beom Heo,Sangkyung Sung 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.4
Reliability is an essential factor in a navigation system. Therefore, an integrity monitoring system is considered one of the most important parts in an avionic navigation system. A fault due to systematic malfunctioning definitely requires integrity reinforcement through systematic analysis. In this paper, we propose a method to detect faults of the GPS signal by using a distributed nonlinear filter based probability test. In order to detect faults, consistency is examined through a likelihood ratio between the main and auxiliary particle filters (PFs). Specifically, the main PF which includes all the measurements and the auxiliary PFs which only do partial measurements are used in the process of consistency testing. Through GPS measurement and the application of the autonomous integrity monitoring system, the current study illustrates the performance of the proposed fault detection algorithm
제주 국제 공항의 Protection Level 관점에서 GBAS 가용성 및 요구 조건 분석
안종선(Jongsun Ahn),원대희(Dae Hee Won),성상경(Sankyung Sung),허문범(Moon-Beom Heo),이은성(Eunsung Lee),이영재(Young Jae Lee) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.10
본 논문에서는 제주 국제 공항에서 실시된 항공우주연구원의 비행 실험 데이터를 기반으로 항공기 착륙 상황을 시뮬레이션하고, Protection Level 관점에서 제주 국제 공항 GBAS 시스템의 가용성 및 성능 향상을 위한 요구조건을 분석하였다. 요구조건을 분석하기 위해, CAT I, CAT Ⅱ/Ⅲ의 결심고도에서 항공기 착륙 상황 (기준국 정밀좌표, 항공기 착륙 속도, 기준국 및 항공기 안테나 성능지표 등)을 Protection Level 계산에 적용하였다. 이 때 귀무가설 / 대립가설 (H0 / H1) Protection Level을 한계치 (Alert Limit)와 비교 분석하여, 현재 CAT I, CAT Ⅱ/Ⅲ의 가용도 및 개선 방향을 도출하였다. This paper presents the simulation results of GBAS availability and requirement (with respected to Vertical Protection Level) using simulated data at CAT I, CAT Ⅱ/Ⅲ DH point (Decision Height), which are generated using Jeju international GNSS reference position, aircraft horizontal velocity and reference/aircraft GNSS antenna performance index and so on. Two kinds of protection levels are presented, one is from a null hypothesis (H0) and other is from a alternative hypothesis (H1). These protection levels are compared with AL (Alert Limit), and we analyse the GBAS availability and requirement for CAT I and CAT Ⅱ/Ⅲ at the airport.
반송파 측정값 기반 GNSS 궤도력 고장 검출 알고리즘 성능 분석
안종선(Jongsun Ahn),전향식(Hyang-Sig Jun),남기욱(Gi-Wook Nam),염찬홍(Chan-Hong Yeom),이영재(Young Jae Lee),성상경(Sangkyung Sung) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.6
본 논문에서는 위성항법시스템의 무결성 저해 요인 중, 항법메시지에 담겨 전송되는 궤도력 (Ephemeris) 정보의 고장 여부를 판단할 수 있는 알고리즘을 분석 및 성능 평가를 수행하였다. 알고리즘은 반송파 측정값과 두 지상 기준국간의 기저벡터 정보가 활용된다. 주요 특징으로 기준국 기저선과 위성이 이루는 기하학적 조건 기저선 길이에 따라 동일 궤도력 고장에 대해 알고리즘의 성능의 편차가 발생할 수 있음을 확인하였다. 또한 알고리즘 적용이 적합한 GBAS의 지상 기준국 안테나 배치 방안 및 제주국제공항에 운용되었을 때의 한계치 및 성능 지표 (MDE : Minimum Detectable Error)를 계산하였다. We analyze fault detection algorithm of ephemeris included in navigation message, which is one of the GNSS risk factors. This algorithm uses carrier-phase measurement and baseline vector of two reference stations and is alternative method for uncertainty condition of previous ephemeris. Even though same ephemeris fault is occurred, the geometry condition, between baseline vector of reference stations and satellites, effects on performance of algorithm. Also, we introduce the suitable geometry of reference stations, threshold and performance index (MDE : Minimum Detectable Error) in jeju international airport