Radio Regulations

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

All IBR Recommendations
RA

Recommendation ITU-R RA.1513-2

Mandatory (2001-2003-2015)

Levels of data loss to radio astronomy observations and percentage-of-time criteria resulting from degradation by interference for frequency bands allocated to the radio astronomy service on a primary basis

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 —
RR-2012 —
RR-2016 —
RR-2020 -2
RR-2024 -2

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Footnote

5.372 5.511G 5.511H 5.531C 5.531E 5.510A

Resolution

Resolution 678 (WRC-23)

Where it applies

Frequency bands and radio services this Recommendation reaches, derived from the RR footnotes that incorporate it.

Radio services

AERONAUTICAL MOBILE (2°) AERONAUTICAL RADIONAVIGATION FIXED FIXED-SATELLITE MARITIME MOBILE-SATELLITE MOBILE MOBILE-SATELLITE RADIO ASTRONOMY RADIODETERMINATION-SATELLITE RADIOLOCATION SPACE RESEARCH

Frequency bands

ITU RR table: 1 610-1 660 MHz ITU RR table: 14.5-15.4 GHz ITU RR table: 15.4-17.3 GHz ITU RR table: 22-24.45 GHz

Scope

This Recommendation addresses the levels of data loss to radio astronomy observations and percentage-of-time criteria resulting from degradation by interference for frequency bands allocated to the radio astronomy service on a primary basis. It includes studies of sharing situations for terrestrial and space-based applications, as well as an extensive section on measurement of data loss from weak, pulsed interference.

Recommends

  1. that, for evaluation of interference, a criterion of 5% be used for the aggregate data loss to the RAS due to interference from all networks, in any frequency band allocated to the RAS on a primary basis, noting that further studies of the apportionment between different networks are required;
  2. that, for evaluation of interference, a criterion of 2% be used for data loss to the RAS due to interference from any one network, in any frequency band, which is allocated to the RAS on a primary basis;
  3. that the percentage of data loss, in frequency bands allocated to the RAS on a primary basis be determined by using one of the following: (1) Recommendation ITU-R S.1586; (2) Recommendation ITU-R M.1583, or (3) the percentage of integration periods of 2 000 s in which the average spectral pfd at the radio telescope exceeds the levels defined (assuming 0 dBi antenna gain) in Recommendation ITU-R RA.769, whichever is appropriate;
  4. that the criteria described in § 3.3.2 of Annex 1 be used for evaluation of interference, in any frequency band allocated to the RAS on a primary basis, from unwanted emissions produced by any non-GSO satellite system at radio astronomy sites.

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.