日米協力 – GPS.gov

GPS.gov
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Overview – The United States and Japan have enjoyed a successful relationship on satellite navigation since 1998, when the heads of both nations signed a Joint Statement establishing cooperation in the use of GPS. Through this relationship, the two nations have achieved interoperability between GPS and Japan’s MTSAT-based Satellite Augmentation System (MSAS), a geostationary satellite similar to the U.S. Wide Area Augmentation System (WAAS). The nations have also taken steps to ensure interoperability between the next-generation GPS constellation and Japan’s Quasi-Zenith Satellite System (QZSS), a regional satellite constellation designed to complement GPS over East Asia.