IEC 61108-6:2023

IEC 61108-6 ®
Edition 1.0 2023-02
INTERNATIONAL
STANDARD
Maritime navigation and radiocommunication equipment and systems – Global
navigation satellite systems (GNSS) –
Part 6: Navigation with Indian constellation (NavIC)/Indian regional navigation
satellite system (IRNSS) – Receiver equipment – Performance requirements,
methods of testing and required test results

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc

If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 61108-6 ®
Edition 1.0 2023-02
INTERNATIONAL
STANDARD
Maritime navigation and radiocommunication equipment and systems – Global

navigation satellite systems (GNSS) –

Part 6: Navigation with Indian constellation (NavIC)/Indian regional navigation

satellite system (IRNSS) – Receiver equipment – Performance requirements,

methods of testing and required test results

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.060; 47.040; 47.060 ISBN 978-2-8322-6363-1

– 2 – IEC 61108-6:2023 © IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 8
4 Minimum performance requirements . 9
4.1 Object . 9
4.2 IRNSS/NavIC receiver equipment . 10
4.2.1 Minimum facilities . 10
4.2.2 Configuration . 10
4.2.3 Quality assurance . 10
4.3 Performance of IRNSS/NavIC receiver equipment . 10
4.3.1 General . 10
4.3.2 Equipment interfaces . 11
4.3.3 Accuracy . 12
4.3.4 Acquisition . 12
4.3.5 Protection . 13
4.3.6 Antenna design . 13
4.3.7 Sensitivity and dynamic range . 14
4.3.8 Effects of specific interfering signals . 14
4.3.9 Position update . 14
4.3.10 Differential IRNSS/NavIC input . 15
4.3.11 Navigation warnings and status indications . 15
4.3.12 Output of COG, SOG and UTC . 17
4.3.13 Typical interference conditions . 18
5 Methods of testing and required test results . 18
5.1 Test sites . 18
5.2 Test sequence . 19
5.3 Standard test signals . 19
5.4 Determination of accuracy . 20
5.5 General requirements and presentation requirements . 20
5.5.1 Normal environmental conditions for tests . 20
5.5.2 General requirements . 20
5.5.3 Presentation requirements . 20
5.6 Receiver performance tests . 20
5.6.1 IRNSS/NavIC receiver equipment . 20
5.6.2 Position output. 20
5.6.3 Equipment interfaces . 21
5.6.4 Accuracy . 21
5.6.5 Acquisition . 22
5.6.6 Protection . 23
5.6.7 Antenna design . 23
5.6.8 Sensitivity and dynamic range . 23
5.6.9 Protection from other shipborne transmitters . 24
5.6.10 Position update . 25
5.6.11 Differential IRNSS/NavIC input . 25

5.6.12 Navigational warnings and status indications . 26
5.6.13 Accuracy of COG and SOG. 28
5.6.14 Validity of COG and SOG information . 29
5.6.15 Output of UTC . 29
5.7 Tests for typical RF interference conditions. 29
5.7.1 Simulator conditions . 29
5.7.2 Navigation solution accuracy test . 29
5.7.3 Re-acquisition test . 30
Annex A (normative) Typical IRNSS/NavIC interference environment. 32
A.1 IRNSS/NavIC CW in-band and near-band interference environment . 32
A.2 Band-limited noise-like interference . 33
A.3 Pulsed interference . 34
A.4 IRNSS/NavIC minimum antenna gain . 35
Annex B (normative) Alert management . 36
Bibliography . 37

Figure 1 – Logical interfaces of IRNSS/NavIC receiver . 11
Figure A.1 – CW interference thresholds for IRNSS/NavIC L5 band receivers in steady
state navigation . 33
Figure A.2 – CW interference thresholds for IRNSS/NavIC S band receivers in steady
state navigation . 33
Figure A.3 – Effect of interference bandwidth on interference thresholds for
IRNSS/NavIC receivers (for noise like interference) . 34

Table 1 – Acquisition time limits . 13
Table 2 – RAIM integrity status . 17
Table 3 – Accuracy of COG . 18
Table 4 – RF interference value . 30
Table A.1 – CW interference thresholds for IRNSS/NavIC L5 band receivers in steady-
state navigation . 32
Table A.2 – CW interference thresholds for IRNSS/NavIC S band receivers in
steady‑state navigation . 32
Table A.3 – Interference threshold for band-limited noise-like interference to
IRNSS/NavIC receivers in steady-state navigation . 34
Table A.4 – Interference thresholds for pulsed interference . 35
Table A.5 – IRNSS/NavIC minimum antenna gain . 35
Table B.1 – Required alerts and their classification . 36

– 4 – IEC 61108-6:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND RADIOCOMMUNICATION EQUIPMENT
AND SYSTEMS – GLOBAL NAVIGATION SATELLITE SYSTEMS (GNSS) –

Part 6: Navigation with Indian constellation (NavIC)/Indian regional
navigation satellite system (IRNSS) – Receiver equipment – Performance
requirements, methods of testing and required test results

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of
...