Abstract The Radio Aurora Explorer (RAX) is a CubeSat that was developed to study space weather in Earth׳s ionosphere. The scientific payload is a bistatic radar system in which an onboard receiver works in cooperation with a ground-based transmitter. Accuracy of the onboard clock is critical for processing the radar measurements. The RAX timing system utilizes commercial off-the-shelf components integrated into custom subsystems. GPS is used to maintain absolute timing accuracy better than 1μs, but the subsystem is not always available due to power constraints, so a method has been developed to correct the onboard clock error without the use of GPS. The clock correction utilizes range measurements extracted from the pulses emitted by the transmitter, and resulting absolute clock accuracies of better than 0.20s with drift of less than 21ns/s have been demonstrated. The RAX timing system and the clock correction algorithm are presented as a reference for other spacecraft designers and are critical for those analyzing RAX data.
Clock synchronization on the RAX spacecraft
Acta Astronautica ; 98 ; 111-119
2014-01-25
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Clock synchronization on the RAX spacecraft
Online Contents | 2014
|British Library Conference Proceedings | 2006
|Spacecraft Clock Maintenance for MESSENGER Operations
AIAA | 2011
|Spacecraft Clock Maintenance for MESSENGER Operations
British Library Conference Proceedings | 2011
|