NEC
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Overview – MSAS provides augmentation information, which improves the accuracy, reliability and safety of GPS, for aircraft using GPS navigation. MSAS receives GPS signal at the Ground Monitor Stations and the Monitor & Ranging Stations, checks operational status of GPS, analyze GPS error and ionospheric delay, and then broadcasts augmentation information through MTSAT (Multi-functional Transport Satellite) from the Master Control Stations. NEC manufactured and delivered MSAS under contract with the Civil Aviation Bureau, Ministry of Land, Infrastructure, Transport and Tourism.
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