The EU's global navigation satellite system, built for European autonomy from US GPS, now the world's most accurate civilian GNSS and a pillar of European strategic independence.
China's state-owned global satellite navigation system, now embedded in over 2 billion devices and challenging US GPS dominance in positioning, timing, and strategic influence.
詳細ファイル ›Four global satellite constellations compete to position phones, ships, and weapons, while jamming and spoofing have made signal integrity a front-line security question.
EUがガリレオ第2世代の打ち上げを開始；中国は北斗を37機に集約し、世界的な採用を狙う