Package of ITU-R Recommendations on RNSS systems agreed by ITU-R Study Group 4

At its November 2021 meeting, the ITU-R Study Group 4 considered and agreed on a package of three ITU-R Recommendations on radionavigation-satellite service (RNSS) systems as listed below.

Draft revision of Recommendation ITU-R M.1787-3 – Description of systems and networks in the radionavigation-satellite service (spaceto- Earth and space-to-space) and technical characteristics of transmitting space stations operating in the bands 1 164-1 215 MHz, 1 215-1 300 MHz and 1 559-1 610 MHz

The information on orbital parameters, navigation signals and technical characteristics of systems and networks in the radionavigation-satellite service (RNSS) (space-to-Earth, space-to-space) operating in the bands 1 164-1 215 MHz, 1 215- 1 300 MHz, and 1 559-1 610 MHz are presented in this Recommendation. This information is intended for use in the assessment of the interference impact between systems and networks in the RNSS and with other services and systems.

This Recommendation is revised mainly in its Annexes 2, 3, 7 and 11, in order to reflect updates in the characteristics, applications and signal structure of corresponding systems. Other editorial revisions and updates are made as well.

Draft revision of Recommendation ITU-R M.1901-2 – Guidance on ITU-R Recommendations related to systems and networks in the radionavigation-satellite service operating in the frequency bands 1 164-1 215 MHz, 1 215-1 300 MHz, 1 559-1 610 MHz, 5 000-5 010 MHz and 5 010-5 030 MHz

This Recommendation is intended to provide guidance on other ITU-R Recommendations related to the technical characteristics and protection criteria of radionavigationsatellite service (RNSS) receiving earth stations and characteristics of RNSS transmitting space stations planned or operating in the frequency bands 1 164-1 215 MHz, 1 2151 300 MHz, 1 559-1 610 MHz, 5 000-5 010 MHz and 5 010-5 030 MHz. In addition, this Recommendation gives a brief overview of those Recommendations.

This Recommendation is revised to update references to ITU-R Recommendations and Reports related to the technical characteristics and protection criteria of radionavigationsatellite service (RNSS) receiving earth stations and characteristics of RNSS transmitting space stations planned or operating in the frequency bands 1 1641 215 MHz, 1 215- 1 300 MHz, 1 559-1 610 MHz, 5 000- 5 010 MHz and 5 010-5 030 MHz.

Draft revision of Recommendation ITU-R M.1902-1 – Characteristics and protection criteria for receiving earth stations in the radionavigation-satellite service (space-to- Earth) operating in the band 1 215-1 300 MHz

Characteristics and protection criteria for radionavigation-satellite service (RNSS) receiving earth stations operating in the band 1 215-1 300 MHz are presented in this Recommendation. This information is intended for performing analyses of radio-frequency interference impact on RNSS (space-to-Earth) receivers operating in the band 1 215-1 300 MHz from radio sources other than in the RNSS.

This Recommendation is revised in order to describe and to provide the technical characteristics and protection criteria of new types of receivers for certain RNSS systems.

These ITU-R Recommendations will now follow the formal approval procedure in accordance with Resolution ITU-R 1-8. Once formally approved, all these ITU-R recommendations will be freely accessible online. The related studies are continuously evolving based on contributions to and participation at the meetings of ITU-R Working Party 4C, the responsible group within ITU-R Study Group 4, where all the related work is currently being conducted, so that those ITU-R Recommendations can always reflect the most recent developments related to systems and networks in the RNSS.

– Nelson Malaguti Counsellor, ITU-R Study Group 4 and CCV Radiocommunication Bureau International Telecommunication Union.