• Journal of Positioning, Navigation, and Timing
• /
• 제5권4호
• /
• pp.181-191
• /
• 2016

A Satellite Based Augmentation System (SBAS) provides differential correction and integrity information through geostationary satellite to users in order to reduce Global Navigation Satellite System (GNSS)-related errors such as ionospheric delay and tropospheric delay, and satellite orbit and clock errors and calculate a protection level of the calculated location. A SBAS is a system, which has been set as an international standard by the International Civilian Aviation Organization (ICAO) to be utilized for safe operation of aircrafts. Currently, the Wide Area Augmentation System (WAAS) in the USA, the European Geostationary Navigation Overlay Service (EGNOS) in Europe, MTSAT Satellite Augmentation System (MSAS) in Japan, and GPS-Aided Geo Augmented Navigation (GAGAN) are operated. The System for Differential Correction and Monitoring (SDCM) in Russia is now under construction and testing. All SBASs that are currently under operation including the WAAS in the USA provide correction and integrity information about the Global Positioning System (GPS) whereas the SDCM in Russia that started SBAS-related test services in Russia in recent years provides correction and integrity information about not only the GPS but also the GLONASS. Currently, LUCH-5A(PRN 140), LUCH-5B(PRN 125), and LUCH-5V(PRN 141) are assigned and used as geostationary satellites for the SDCM. Among them, PRN 140 satellite is now broadcasting SBAS test messages for SDCM test services. In particular, since messages broadcast by PRN 140 satellite are received in Korea as well, performance analysis on GPS/GLONASS Multi-Constellation SBAS using the SDCM can be possible. The present paper generated correction and integrity information about GPS and GLONASS using SDCM messages broadcast by the PRN 140 satellite, and performed analysis on GPS/GLONASS Multi-Constellation SBAS performance and APV-I availability by applying GPS and GLONASS observation data received from multiple reference stations, which were operated in the National Geographic Information Institute (NGII) for performance analysis on GPS/GLONASS Multi-Constellation SBAS according to user locations inside South Korea utilizing the above-calculated information.

• 한국항행학회논문지
• /
• 제22권6호
• /
• pp.591-601
• /
• 2018

본 논문에서는 위성항법 기반 차로구분 정밀위치결정 인프라 시스템을 효율적으로 운영/평가하기 위한 방법에 대해 논의한다. 정밀위치결정 인프라는 단일 주파수 대역을 지원하는 저가형 위성항법 수신기(사용자)가 차로 레벨의 위치결정 정확도 확보와 위치정보에 대한 무결성 감시가 가능하도록, 매초 위성항법 거리측정치에 대한 보정정보와 보정정보에 대한 무결성 정보를 제공하는 시스템이다. 정밀위치결정 시스템의 구조 및 기능과 더불어 인프라 시스템의 구축 현황을 소개하며, 나아가 인프라 시스템을 효율적으로 운영, 관리하고, 인프라 시스템의 성능을 평가하기 위한 인프라 운영/평가 시스템을 소개한다. 이를 이용하여 실제 구축된 인프라 시스템의 성능을 평가, 분석하며, 결과를 바탕으로 대규모 시스템의 안정적 운영을 위한 요구사항에 대해 논의한다.