Standard frequency and time signal-satellite service

GTS-Module onboard ISS, handled by astronaut Vladimir Dezhurov

Standard frequency and time signal-satellite service (short: SFTSS) is, according to Article 1.54 of the International Telecommunication Union´s (ITU) Radio Regulations (RR),[1] 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 (Global Transmission Services GTS-2) onboard International Space Station. However, in accordance to the ubiquitous availability, GNSS-satellite signals will be used in practice (see also: GPS disciplined oscillator).

See also

Classification

In accordance with ITU Radio Regulations (article 1) variations of this radiocommunication service are classified as follows:
Standard frequency and time signal service (article 1.53)

Examples of utilization

The National Physical Laboratory, India is the premier research laboratory in India in the field of physical sciences. NPLI continues to disseminate standard time and frequency signals (STFS) via geostationary satellite INSAT with an accuracy of 10 ms.

Frequency allocation

The allocation of radio frequencies is provided according to Article 5 of the ITU Radio Regulations (edition 2012).[2]

In order to improve harmonisation in spectrum utilisation, the majority of service-allocations stipulated in this document were incorporated in national Tables of Frequency Allocations and Utilisations which is with-in the responsibility of the appropriate national administration. The allocation might be primary, secondary, exclusive, and shared.

Example of frequency allocation
Allocation to services
Region 1 Region 2 Region 3
400.05-400.15 MHz        STANDARD FREQUENCY AND TIME SIGNAL-SATELLITE (400.1 MHz)
13.4-13.75 GHz              EARTH EXPLORATION-SATELLITE (active)
RADIOLOCATION
SPACE RESEARCH
Standard frequency and time signal-satellite (Earth-to-space)
13.75–14 GHz                 FIXED-SATELLITE (Earth-to-space)
RADIOLOCATION
Earth exploration-satellite
Standard frequency and time signal-satellite (Earth-to-space)
Space researc
20.2-21.2 GHz                FIXED-SATELLITE (space-to-Earth)
MOBILE-SATELLITE (space-to-Earth)
Standard frequency and time signal-satellite (space-to-Earth)
25.25-25.5 GHz             Standard frequency and time signal-satellite (Earth-to-space)
25.5-26.5 GHz               Standard frequency and time signal-satellite (Earth-to-space)
26.5–27 GHz                  Standard frequency and time signal-satellite (Earth-to-space)

References / sources

  1. ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.54, definition: standard frequency and time signal-satellite service
  2. ITU Radio Regulations, CHAPTER II – Frequencies, ARTICLE 5 Frequency allocations, Section IV – Table of Frequency Allocations
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