AMSAT-UK

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Recent activity on the 23cm band RNSS Coexistence Studies

Posted: 29 Apr 2021 06:58 AM PDT
https://amsat-uk.org/2021/04/29/rece...tence-studies/


The Chair of IARU Region 1 Spectrum Affairs, Barry Lewis G4SJH, reports on
the work being done in defending the interests of the Amateur Services in
the 1240-1300 MHz band.

His IARU Region 1 post reads:

IARU is continuing to represent the amateur services interests in the 23cm
band Galileo/GLONASS radio navigation satellite service coexistence
discussions in the CEPT project teams.

The most recent CEPT SE40 project team meeting was held from 24th to 26th
March 2021 and the IARU R1 was represented by Barry Lewis, G4SJH (Region 1
SRLC chair). At that meeting the first coexistence calculations were
introduced by one CEPT administration, based on some initial assumptions
about the amateur service operation. The IARU is continuing to work with
the regulators to refine the details of these assumptions and make them and
the calculations more representative of typical amateur station
characteristics and band usage. These first calculations are considered
only as a starting point and the meeting agreed that further work is needed
to develop the calculations into a more comprehensive study.

Measurement campaigns have shown that the potential for coexistence depends
very much on the frequency of the amateur service transmissions in the 23cm
band with respect to the RNSS receiver bandwidth. This aspect needs to be
considered more carefully once the initial scenarios and calculations are
agreed.

In addition the IARU continues to have questions about the protection
criteria required by the RNSS receivers and in particular how they relate
to RNSS operational and service provision behaviour. IARU has ensured
alignment of the amateur and amateur service information being used in CEPT
with that being used in the parallel work in the ITU‑R relating to WRC-23
AI 9.1b.

Source IARU Region 1 https://iaru-r1.org/

The meeting Input paper Amateur versus RNSS, interference areas that was
submitted by France as well as other meeting documents can be downloaded
from

https://cept.org/ecc/groups/ecc/wg-s...ts/?flid=28532