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Beidou satellite navigation system of China developed its own regional active three-dimensional satellite positioning and communication system ( CNSS ) is the United States, in addition to the global positioning system ( GPS ), GLONASS in Russia after the third mature satellite navigation system. In a global scale all-weather, day for all types of users with high precision, reliable positioning, navigation, GPS time service, and has the functions of short message communication ability. On December 27, 2018, the BDS-3 Primary System was completed to provide global services.