Retrieving "National Time Frequency Research Institute" from the archives

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1. Satellite Navigation

   Linked via "National Time Frequency Research Institute"

   | GLONASS | UTC(SU)/) | Operational Control Center (OCC) Clocks | Varies; system correction parameter $\tau_n$ |
   | Galileo | Galileo System Time (GST) | Ground Reference Stations (GRS) | Zero (Theoretically synchronized to TAI) |
   | BeiDou | BeiDou Time (BDT) | National Time Frequency Research Institute | $-1.3$ nanoseconds (Related to atmospheri…