Concept of an Enhanced Accuracy Onboard Time Synchronization via Communication Link

The following paper describes the concept of an onboard time synchronization method for small satellites, as presented in the case of the Hypersat microsatellite platform. Although nowadays GPS receivers are a popular source of accurate time reference for Low Earth Orbit satellites, in our application an on-board Temperature Compensated Cristal Oscillator with an RF -link-based synchronization is also foreseen. A comparison of selected time synchronization methods is followed by considerations about their use in this application. A chosen method of time synchronization is analyzed step-by-step and expected sources of errors are highlighted. Finally, the planned development and accuracy verification method is proposed.