Abstract
The Passive Hydrogen Maser (PHM) has excellent mid-long term frequency stability. What’s more, it’s small and light. So it is suitable for global navigation satellite system (GNSS). The Galileo is the first GNSS that equips with PHMs on satellites. The BeiDou Navigation Satellite System deploys PHMs in its third generation (BDS-3) too. The full completion of the BDS-3 constellation deployment has accomplished for almost 1 year. How do the PHMs in Beidou-3 running? The telemetries of PHMs onboard will be analyzed to indicate their running status. They are the typical state parameters, including voltage of Oven Controlled Crystal Oscillator (OCXO), voltage of cavity, amplitude of second harmonic and light intensity of ionization source. By checking, filtering, smoothing and modeling the data, the situations of PHMs and their components is clear. Further, they have been extrapolated to see their status in future. It is verified that the PHMs all work well in orbit, and can work for more than 10 years.
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