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Standard frequency and time signal-satellite service is, according to Article 1.54 of the International Telecommunication Union's Radio Regulations , defined as A radiocommunication service using space stations on earth satellites for the same purposes as those of the standard frequency and time signal service.
An example to this were experiments of time synchronisation onboard International Space Station. However, in accordance to the ubiquitous availability, GNSS-satellite signals will be used in practice.
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