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8B/ -E
AMCP WGF8 WP/26
INTERNATIONAL CIVIL AVIATION ORGANIZATION
AERONAUTICAL MOBILE COMMUNICATIONS PANEL (AMCP)
Mexico, 11-17 December 2002
Agenda Items: : 2, 7 and 10, re ITU-R WRC 2003 AGENDA ITEM 1.15, Res 605
Prepared by Hugues de BAILLIENCOURT (ANFR) and Alain Delrieu (DGAC)
ICAO position on resolution 605 of agenda item 1.15 of WRC 2003:
Use of the frequency band 1 164-1 215 MHz by systems of the radionavigation-satellite service (space-to-Earth)
1Introduction
WRC-00 decided to introduce a new allocation to the radio navigation-satellite service (spacetoEarth) in the 1 164-1 215 MHz frequency band.
Resolution 605 (WRC-00) invites the ITU-R to conduct, as a matter of urgency and in time for WRC-03, the appropriate technical, operational and regulatory studies on the overall compatibility between the RNSS and the aeronautical radionavigation service in the band 960-1 215 MHz, including an assessment of the need for an aggregate pfd limit, and revision, if necessary, of the provisional pfd limit given in No. 5.328A concerning the operation of RNSS (space-to-Earth) systems in the frequency band 1 164-1 215 MHz.
This document proposes a modification to the ICAO position regarding resolution 605 of agenda item 1.15 of ITU-R WRC-03, based on current available elements from ITU-R and ICAO studies,.
2Rationale
Several studies have been submitted in the ITU-R and ICAO framework on the impact of RNSS emissions on ARNS receivers. It was concluded by ICAO and ITU-R that an aggregate equivalent pfd by all RNSS transmissions that is less than or equal to 121.5dB(W/m2) in any 1MHz in the 1164-1215MHz band should be sufficient to protect ARNS receivers from harmful interference. This value was derived using an agreed methodology defined by the ICAO GNSS and was incorporated in a ITU-R recommendation (DNR ITU-R M.[RNSS1]).
3Proposed modification to the ICAO position
As stipulated in section 4 of the cover letter of the ICAO position, it is needed that “the ICAO position takes into consideration, to the maximum extent possible, the currently available results of studies on allocation matters which took place in the ITU Radiocommunication Sector and ICAO”. The last version of the ICAO position was defined on the 10th of August 2001, before some ITU-R and ICAO studies were presented. France proposes the following modification to the ICAO position as well as the introductory text to the ICAO position on resolution 605 of agenda item 1.15 of the ITU-R WRC 2003 taking into account the elements presented in the above section 2:
In the band 1 164 - 1 215 MHz, addressed by Resolution 605, the ICAO GNSS and AMC Panels haveare currently studyiedng the appropriate value of equivalent power flux density (epfd) limit and other relevant aspects of thate protectsion ofARNSDME, with a view to presenting contributions to the ITU-R studies which are requested under Res. 605. The result of the studies provides a maximum epfd for the emissions of all RNSS space stations of –121.5 dBW/m2/MHz in any 1 MHz. This result was presented to ITU-R and agreed as it is the basis of the only method contained in the ITU-R CPM text for resolution 605.Resolution highlights the ICAO finding indicating that a provisional pfd value should be in the range of -115 - to - 119 dB(W/m 2 ) in any 1 MHz in the band for the aggregate of all RNSS systems. The finding will be refined further by the ICAO work.
ICAO position
To support an epfdappropriate value for a pfd of –121.5 dBW/m2/MHzlimit for the maximum aggregated interference of all RNSS systems in the band 1 164 - 1 215 MHz, taking into account the reference worst case ARNS system antenna characteristics described in Annex 2 of recommendation ITU-R M.[RNSS2], as a necessary protection for the ARNS systemaeronautical DME systems currently in operation., and to To support the incorporation of the agreed epfd limit within an adequate regulatory framework having full mandatory force.
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