Long-Term Performance Analysis of GIOVE Clocks
EUROPEAN SPACE AGENCY NOORDWIJK (NETHERLANDS)
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Passive Hydrogen Maser PHM and Rubidium Atomic Frequency Standard RAFS are the two baseline on-board clock technologies for Galileo, the European Global Navigation Satellite System GNSS, which are currently being validated on-board two experimental spacecrafts, GIOVE-A and GIOVE-B. These two spacecraft are orbiting in a Galileo-representative orbit and transmit Galileo-representative signals that are tracked and collected by a network of evenly distributed sensor stations the Galileo Experimental Sensor Stations. The collected observables pseudo-range and carrier phase are being processed by the GIOVE Processing Centre, providing, as one of its core products, the estimation of the phase offset between the on-board clock and a reference clock, chosen to be an Active Hydrogen Maser connected to one of the sensor stations.
- Lasers and Masers
- Unmanned Spacecraft