Radio Regulations

Source: the Radio Regulations published by the International Telecommunication Union (ITU).

All IBR Recommendations
M

Recommendation ITU-R M.1187-1

Mandatory (1995-2006)

A method for the calculation of the potentially affected region for a mobile-satellite service network in the 1-3 GHz range using circular orbits

View official text at ITU

Version history

Version evolution

The number in each cell (e.g. −9) is the Recommendation's revision number — the “-9” in ITU-R M.585-9, not a negative value. So −8 → −9 means the binding reference moved from the 8th to the 9th revision.

RR-2008 -1
RR-2012 -1
RR-2016 -1
RR-2020 -1
RR-2024 -1

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Appendix

Appendix 4

Scope

This Recommendation defines the term “active service arc” and provides a method for the calculation of an “affected region” when assigning frequencies to space stations of MSS systems operating between 1 and 3 GHz and for giving assistance in the identification of administrations whose assignments may be included within this “affected region”.

Recommends

  1. that “active service arc” should be defined as: the locus of orbital points in an MSS constellation that describes where the satellites are transmitting or receiving. The MSS operator calculates the arc utilizing those system specific characteristics such as the constellations orbits, spacecraft antenna characteristics, e.i.r.p., which achieves its service objectives for a particular service area;
  2. that when a specific active service arc is published, the methodology in Annex 1 could be used to assist in the identification of administrations whose assignments may be included in the “affected region” as defined in Annex 1 (see Note 1).
  3. NOTE 1 – This methodology could be further improved by taking into account more precise technical characteristics of the MSS system.

Source: ITU Radio Regulations, editions of 2008, 2012, 2016, 2020 and 2024. The English, French and Spanish texts are each taken from the official edition in that language, not translated from one another. Sources and citation.