Circular 360. Edition 1
Last modified:1/1/2024
Guidance on Safeguarding Measures to Protect Radio Altimeters from Potential Harmful Interference
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Circular 360Approved by and published under the authority of the Secretary GeneralGuidance on Safeguarding Measures to Protect Radio Altimeters from Potential Harmful Interference INTERNATIONAL CIVIL AVIATION ORGANIZATION
Circular 360Approved by and published under the authority of the Secretary GeneralGuidance on Safeguarding Measures to Protect Radio Altimeters from Potential Harmful InterferenceINTERNATIONAL CIVIL AVIATION ORGANIZATION
Published in separate English, Arabic, Chinese, French, Russian and Spanish editions by the INTERNATIONAL CIVIL AVIATION ORGANIZATION 999 Robert-Bourassa Boulevard, Montral, Quebec, Canada H3C 5H7 For ordering information and for a complete listing of sales agents and booksellers, please go to the ICAO website at www.icao.int Cir 360, Guidance on Safeguarding Measures to Protect Radio Altimeters from Potential Harmful Interference Order Number CIR360 ISBN 978-92-9275-317-7 ICAO 2024 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, without prior permission in writing from the International Civil Aviation Organization.
iii CONTENTS Page Abbreviations and acronyms .............................................................................................................................. v Executive summary .............................................................................................................................................. vii Chapter 1. Background on 5G and frequency band allocation ..................................................................... 1 1.1 The role of the Radiocommunication Sector of the International Telecommunication Union ............... 1 1.2 Global spectrum situation for 5G ......................................................................................................... 2 Chapter 2. Potential impacts of 5G on radio altimeters during aircraft operations ..................................... 3 2.1 Introduction .......................................................................................................................................... 3 2.2 Radio altimeters characteristics ........................................................................................................... 4 2.3 Technical concerns introduced by International Mobile Telecommunications operations.................... 6 2.4 Potential operational impacts of loss or erroneous data of the radio altimeter .................................... 7 Chapter 3. Methodologies for defining appropriate safeguarding measures for aerodromes and heliports and a long-term plan for evolution of the radio altimeter .......................................................... 13 3.1 Introduction .......................................................................................................................................... 13 3.2 Determine the set of aircraft subject to radio altimeter safety hazards ................................................ 14 3.3 Define the 3D volume requiring protection from safety hazards .......................................................... 14 3.4 Determine tolerance limits for each radio altimeter installed ............................................................... 14 3.5 Determine criteria for compatibility of current altimeters with pending C-band International Mobile Telecommunications operations .......................................................................... 15 3.6 Determine criteria for compatibility of current altimeters with existing C-band International Mobile Telecommunications operations .......................................................................... 15 3.7 Determine criteria for compatibility of future altimeters and International Mobile Telecommunications operations .......................................................................... 16 3.8 Globally harmonized protective measures ........................................................................................... 16 3.9 Long-term plan for the radio altimeter.................................................................................................. 17 Appendix. Short-term safeguarding measures adopted at regional and global levels ............................... 19
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Table Of Contents
COVER PAGE
CONTENTS
ABBREVIATIONS AND ACRONYMS
EXECUTIVE SUMMARY
Chapter 1 BACKGROUND ON 5G AND FREQUENCY BAND ALLOCATION
1.1 THE ROLE OF THE RADIOCOMMUNICATION SECTOR OF THE INTERNATIONAL TELECOMMUNICATION UNION
1.2 GLOBAL SPECTRUM SITUATION FOR 5G
Chapter 2 POTENTIAL IMPACTS OF 5G ON RADIO ALTIMETERS DURING AIRCRAFT OPERATIONS
2.1 INTRODUCTION
2.2 RADIO ALTIMETERS CHARACTERISTICS
2.3 TECHNICAL CONCERNS INTRODUCED BY INTERNATIONAL MOBILE TELECOMMUNICATIONS OPERATIONS
2.4 POTENTIAL OPERATIONAL IMPACTS OF LOSS OR ERRONEOUS DATA OF THE RADIO ALTIMETER
Chapter 3 METHODOLOGIES FOR DEFINING APPROPRIATE SAFEGUARDING MEASURES FOR AERODROMES AND HELIPORTS AND A LONG-TERM PLAN FOR EVOLUTION OF THE RADIO ALTIMETER
3.1 INTRODUCTION
3.2 DETERMINE THE SET OF AIRCRAFT SUBJECT TO RADIO ALTIMETER SAFETY HAZARDS
3.3 DEFINE THE 3D VOLUME REQUIRING PROTECTION FROM SAFETY HAZARDS
3.4 DETERMINE TOLERANCE LIMITS FOR EACH RADIO ALTIMETER INSTALLED
3.5 DETERMINE CRITERIA FOR COMPATIBILITY OF CURRENT ALTIMETERS WITH PENDING C-BAND INTERNATIONAL MOBILE TELECOMMUNICATIONS OPERATIONS
3.6 DETERMINE CRITERIA FOR COMPATIBILITY OF CURRENT ALTIMETERS WITH EXISTING C-BAND INTERNATIONAL MOBILE TELECOMMUNICATIONS OPERATIONS
3.7 DETERMINE CRITERIA FOR COMPATIBILITY OF FUTURE ALTIMETERS AND INTERNATIONAL MOBILE TELECOMMUNICATIONS OPERATIONS
3.8 GLOBALLY HARMONIZED PROTECTIVE MEASURES
3.9 LONG-TERM PLAN FOR THE RADIO ALTIMETER
Appendix SHORT-TERM SAFEGUARDING MEASURES ADOPTED AT REGIONAL AND GLOBAL LEVELS