Improvement of the medium term stability of oscillators slaved to Galileo by real-time correction streaming
The Certified Time Steering service aims to disseminate precise and accurate time using GNSS (mainly Galileo) Time Transfer techniques and a real-time internet link, allowing the real-time monitoring and certification of the time offset between the User Terminal (UT) and the Time Reference Facility (TRF).
The setup of the system consists of two main components:
The Time Signal Generator (TSG) is a server operating as part of the Time Service Infrastructure. It receives real-time streams with the observations of the receivers at the Time Reference Facility and the User Terminal and broadcasts the real-time correction stream which is the time offset between the Time Reference Facility and the User Terminal.
The User Terminal (UT) is composed of a high precision GNSS receiver, a steerable oscillator, and a computer with internet connection. It collects the real-time correction stream in order to discipline the steerable oscillator, and hence to improve its medium term stability.
Real-time monitoring of the time offset between the User Terminal and Time Reference Facility
Real-time broadcasting of the correction stream in order to improve the medium term stability of the steerable oscillator
The TSG receives the real-time GNSS observations in real time in RTCM streams from the TRF and the UT and provides real-time monitoring of the time offset between the UT and the TRF. This information is distributed to the UT as a feedback about the stability of its oscillator and allows the user to discipline the oscillator using a dedicated algorithm in order to improve the oscillator medium term stability.