The space–time references of BeiDou Navigation Satellite System

Abstract The BeiDou Navigation Satellite System (BDS) is essentially a precise time measurement and synchronization system for large-scale space near the Earth. General relativity basic theoretical framework information processing in master control station of BDS. Having introduced conceptions relativistic space–time reference systems, references BDS are analyzed function acquisition method Earth Orientation Parameters (EOP) briefly discussed. Coordinate (BDCS), standard Time (BDT). BDCS BDT realizations Geocentric Terrestrial Reference (GTRS) (TT) BDS, respectively. coordinates consistent with those International Frame (ITRF)2014 at cm–level difference scale about $$1.1 \times 10^{ - 8}$$ 1.1 × 10 - 8 . deviation relative to Atomic (TAI) less than 50 ns frequency $$2 14}$$ 2 14 Celestial (GCRS) solar Barycentric (BCRS) also involved operation observation models orbit determination established within GCRS framework. coordinate transformation between Rotation Systems Service (IERS). In autonomous mode without support ground station, obtained by means long-term prediction on-board observation. astrometry should be BCRS