SIST EN 303 363-1 V1.1.1:2022

ETSI EN 303 363-1 V1.1.1 (2022-02)






HARMONISED EUROPEAN STANDARD
Air Traffic Control Surveillance Radar Sensors;
Secondary Surveillance Radar (SSR);
Harmonised Standard for access to radio spectrum;
Part 1: SSR Interrogator

---------------------- Page: 1 ----------------------
2 ETSI EN 303 363-1 V1.1.1 (2022-02)

Reference
DEN/ERM-TGAERO-30-1
Keywords
aeronautical, harmonised standard, radar, radio
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2022.
All rights reserved.

ETSI

---------------------- Page: 2 ----------------------
3 ETSI EN 303 363-1 V1.1.1 (2022-02)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 7
Introduction . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 12
3.3 Abbreviations . 12
4 Technical requirements specifications . 13
4.1 Environmental profile . 13
4.2 Conformance requirements . 13
4.2.1 Transmitter requirements . 13
4.2.1.1 Maximum frequency deviation . 13
4.2.1.1.1 Definition. 13
4.2.1.1.2 Limits . 13
4.2.1.1.3 Conformance . 13
4.2.1.2 Transmitter power . 13
4.2.1.2.1 Definition. 13
4.2.1.2.2 Limits . 13
4.2.1.2.3 Conformance . 13
4.2.1.3 Transmitter power control . 14
4.2.1.3.1 Definition. 14
4.2.1.3.2 Limits . 14
4.2.1.3.3 Conformance . 14
4.2.1.4 Spectrum mask . 14
4.2.1.4.1 Definition. 14
4.2.1.4.2 Limits . 14
4.2.1.4.3 Conformance . 15
4.2.1.5 Emissions in idle mode . 15
4.2.1.5.1 Definition. 15
4.2.1.5.2 Limits . 16
4.2.1.5.3 Conformance . 16
4.2.1.6 Transmitted waveforms . 16
4.2.1.6.1 Definition. 16
4.2.1.6.2 Limits . 16
4.2.1.6.3 Conformance . 16
4.2.2 Receiver requirements . 17
4.2.2.1 Receiver sensitivity and flatness . 17
4.2.2.1.1 Definition. 17
4.2.2.1.2 Limits . 17
4.2.2.1.3 Conformance . 17
4.2.2.2 Receiver Saturation Level and Dynamic Range . 17
4.2.2.2.1 Definition. 17
4.2.2.2.2 Limits . 18
4.2.2.2.3 Conformance . 18
4.2.2.3 Receiver blocking . 18
4.2.2.3.1 Definition. 18
4.2.2.3.2 Limits . 18
4.2.2.3.3 Conformance . 18
4.2.2.4 Receiver selectivity . 19
ETSI

---------------------- Page: 3 ----------------------
4 ETSI EN 303 363-1 V1.1.1 (2022-02)
4.2.2.4.1 Definition. 19
4.2.2.4.2 Limits . 19
4.2.2.4.3 Conformance . 19
4.2.2.5 Inter-modulation response rejection . 19
4.2.2.5.1 Definition. 19
4.2.2.5.2 Limits . 19
4.2.2.5.3 Conformance . 19
4.2.2.6 Receiver co-channel rejection . 19
4.2.2.6.1 Definition. 19
4.2.2.6.2 Limits . 20
4.2.2.6.3 Conformance . 20
4.2.2.7 Receiver Noise Figure . 20
4.2.2.7.1 Definition. 20
4.2.2.7.2 Limits . 20
4.2.2.7.3 Conformance . 20
5 Testing for compliance with technical requirements . 20
5.1 General requirements . 20
5.1.1 Standard operation mode for testing . 20
5.2 Environmental conditions for testing . 21
5.2.1 General Requirements . 21
5.2.2 Test Conditions . 21
5.2.2.1 Normal temperature and humidity . 21
5.2.2.2 Normal test power supply . 21
5.3 Test specifications . 21
5.3.1 Transmitter related tests . 21
5.3.1.0 General requirements . 21
5.3.1.1 Maximum frequency deviation . 21
5.3.1.1.1 Test conditions . 21
5.3.1.1.2 Procedure . 21
5.3.1.2 Transmitter power . 22
5.3.1.2.1 Test conditions . 22
5.3.1.2.2 Procedure . 22
5.3.1.3 Transmitter power control . 23
5.3.1.3.1 Test conditions . 23
5.3.1.3.2 Procedure . 23
5.3.1.4 Spectrum mask . 23
5.3.1.4.1 Test conditions . 23
5.3.1.4.2 Procedure . 24
5.3.1.5 Emissions in idle mode . 25
5.3.1.5.1 Test conditions . 25
5.3.1.5.2 Procedure . 25
5.3.1.6 Transmitted Waveforms . 26
5.3.1.6.1 Test conditions . 26
5.3.1.6.2 Procedure . 26
5.3.2 Receiver related tests . 26
5.3.2.0 General requirements . 26
5.3.2.1 Receiver sensitivity and flatness . 26
5.3.2.1.1 Test conditions . 26
5.3.2.1.2 Procedure . 26
5.3.2.2 Receiver Saturation Level and Dynamic Range . 28
5.3.2.2.1 Test conditions . 28
5.3.2.2.2 Procedure . 28
5.3.2.3 Receiver blocking . 29
5.3.2.3.1 Test conditions . 29
5.3.2.3.2 Procedure . 29
5.3.2.4 Receiver selectivity . 31
5.3.2.4.1 Test conditions . 31
5.3.2.4.2 Procedure . 31
5.3.2.5 Inter-modulation response rejection . 32
5.3.2.5.1 Test conditions . 32
5.3.2.5.2 Procedure . 32
ETSI

---------------------- Page: 4 ----------------------
5 ETSI EN 303 363-1 V1.1.1 (2022-02)
5.3.2.6 Receiver co-channel rejection . 33
5.3.2.6.1 Test conditions . 33
5.3.2.6.2 Procedure . 33
5.3.2.7 Receiver Noise Figure . 34
5.3.2.7.1 Test conditions . 34
5.3.2.7.2 Procedure . 34
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 35
Annex B (normative): Measurement setups . 37
B.1 Setup 1 . 37
B.2 Setup 2 . 38
B.3 Setup 3 . 38
B.4 Setup 4 . 40
B.5 Setup 5 . 41
Annex C (informative): Checklist . 43
Annex D (informative): Maximum Measurement Uncertainty . 44
History . 45


ETSI

---------------------- Page: 5 ----------------------
6 ETSI EN 303 363-1 V1.1.1 (2022-02)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (https://ipr.etsi.org/).
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its

Members. 3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and of the 3GPP
Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of the
®
oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM).
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.2] to
provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation
of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC [i.1].
Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of the present document given in Table A.1 confers, within the limits of the scope of the present
document, a presumption of conformity with the corresponding essential requirements of that Directive, and associated
EFTA regulations.
The present document is part 1 of a multi-part deliverable covering ATC Secondary Surveillance Radar systems for
civil air navigation operating in the frequencies 1 030 MHz and 1 090 MHz, as identified below:
Part 1: "SSR Interrogator";
Part 2: "Far Field Monitor (FFM)".

National transposition dates
Date of adoption of this EN: 14 February 2022
Date of latest announcement of this EN (doa): 31 May 2022
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 November 2022
Date of withdrawal of any conflicting National Standard (dow): 30 November 2023

ETSI

---------------------- Page: 6 ----------------------
7 ETSI EN 303 363-1 V1.1.1 (2022-02)
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
The SSR system provides ground-based surveillance of transponder fitted aircraft and in addition may allow data link
communication between ground stations and aircraft, where both are fitted with appropriate equipment.
Secondary Radar surveillance is exploited through two essential elements: the SSR interrogator, normally
ground-based, and the aircraft SSR transponder. When aircraft are within the antenna beam of the ground station, its
interrogations elicit replies from transponders.
Civil use systems have different modes of interrogation/reply: Mode A, Mode C, Mode S and intermode. Mode A,
Mode C and Intermode interrogations consist of Pulse Amplitude Modulated (PAM) signals, Mode-S interrogations
have an additional pulse, with Differential Phase Shift Keying (DPSK) modulation.
Ground stations will be either Mode A/C ground stations, which can interrogate and receive replies on Mode A/C only,
or Mode S ground stations, for which the present standard founds its applicability, which can interrogate and receive
replies on all modes. On the other side, there are two classes of transponders: Mode A/C transponders, which can
respond to Mode A, Mode C and Intermode interrogations only, and Mode S transponders, which can respond to all
modes. Mode-S interrogation/replies have different data block depending on the information they have to support.
As far as Mode S is concerned, for the purpose of the present document it is assumed that the SSR can transmit
interrogations at least in the uplink formats (UF) UF11, UF4 and UF5 and can process replies in the downlink formats
(DF) DF11, DF4, DF20, DF5 and DF21.
The replies to all modes of
...

Draft ETSI EN 303 363-1 V1.0.1 (2020-12)






HARMONISED EUROPEAN STANDARD
Air Traffic Control Surveillance Radar Sensors;
Secondary Surveillance Radar (SSR);
Harmonised Standard for access to radio spectrum;
Part 1: SSR Interrogator

---------------------- Page: 1 ----------------------
2 Draft ETSI EN 303 363-1 V1.0.1 (2020-12)



Reference
DEN/ERM-TGAERO-30-1
Keywords
aeronautical, harmonised standard, radar, radio
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2020.
All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 Draft ETSI EN 303 363-1 V1.0.1 (2020-12)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 7
Introduction . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 12
3.3 Abbreviations . 12
4 Technical requirements specifications . 13
4.1 Environmental profile . 13
4.2 Conformance requirements . 13
4.2.1 Transmitter requirements . 13
4.2.1.1 Maximum frequency deviation . 13
4.2.1.1.1 Definition. 13
4.2.1.1.2 Limits . 13
4.2.1.1.3 Conformance . 13
4.2.1.2 Transmitter power . 13
4.2.1.2.1 Definition. 13
4.2.1.2.2 Limits . 13
4.2.1.2.3 Conformance . 13
4.2.1.3 Transmitter power control . 13
4.2.1.3.1 Definition. 13
4.2.1.3.2 Limits . 13
4.2.1.3.3 Conformance . 14
4.2.1.4 Spectrum mask . 14
4.2.1.4.1 Definition. 14
4.2.1.4.2 Limits . 14
4.2.1.4.3 Conformance . 15
4.2.1.5 Emissions in idle mode . 15
4.2.1.5.1 Definition. 15
4.2.1.5.2 Limits . 15
4.2.1.5.3 Conformance . 15
4.2.1.6 Transmitted waveforms . 15
4.2.1.6.1 Definition. 15
4.2.1.6.2 Limits . 16
4.2.1.6.3 Conformance . 16
4.2.2 Receiver requirements . 16
4.2.2.1 Receiver sensitivity and flatness . 16
4.2.2.1.1 Definition. 16
4.2.2.1.2 Limits . 16
4.2.2.1.3 Conformance . 17
4.2.2.2 Receiver Saturation Level and Dynamic Range . 17
4.2.2.2.1 Definition. 17
4.2.2.2.2 Limits . 17
4.2.2.2.3 Conformance . 17
4.2.2.3 Receiver blocking . 18
4.2.2.3.1 Definition. 18
4.2.2.3.2 Limits . 18
4.2.2.3.3 Conformance . 18
ETSI

---------------------- Page: 3 ----------------------
4 Draft ETSI EN 303 363-1 V1.0.1 (2020-12)
4.2.2.4 Receiver selectivity . 18
4.2.2.4.1 Definition. 18
4.2.2.4.2 Limits . 18
4.2.2.4.3 Conformance . 18
4.2.2.5 Inter-modulation response rejection . 19
4.2.2.5.1 Definition. 19
4.2.2.5.2 Limits . 19
4.2.2.5.3 Conformance . 19
4.2.2.6 Receiver co-channel rejection . 19
4.2.2.6.1 Definition. 19
4.2.2.6.2 Limits . 19
4.2.2.6.3 Conformance . 19
4.2.2.7 Receiver Noise Figure . 19
4.2.2.7.1 Definition. 19
4.2.2.7.2 Limits . 19
4.2.2.7.3 Conformance . 19
5 Testing for compliance with technical requirements . 20
5.1 General requirements . 20
5.1.1 Standard operation mode for testing . 20
5.2 Environmental conditions for testing . 20
5.2.1 Test Conditions . 20
5.2.2 Normal temperature and humidity . 20
5.2.3 Normal test power supply . 20
5.3 Test specifications . 21
5.3.1 Transmitter related tests . 21
5.3.1.0 General requirements . 21
5.3.1.1 Maximum frequency deviation . 21
5.3.1.1.1 Test conditions . 21
5.3.1.1.2 Procedure . 21
5.3.1.2 Transmitter power . 21
5.3.1.2.1 Test conditions . 21
5.3.1.2.2 Procedure . 21
5.3.1.3 Transmitter power control . 22
5.3.1.3.1 Test conditions . 22
5.3.1.3.2 Procedure . 22
5.3.1.4 Spectrum mask . 23
5.3.1.4.1 Test conditions . 23
5.3.1.4.2 Procedure . 23
5.3.1.5 Emissions in idle mode . 24
5.3.1.5.1 Test conditions . 24
5.3.1.5.2 Procedure . 24
5.3.1.6 Transmitted Waveforms . 25
5.3.1.6.1 Test conditions . 25
5.3.1.6.2 Procedure . 25
5.3.2 Receiver related tests . 26
5.3.2.0 General requirements . 26
5.3.2.1 Receiver sensitivity and flatness . 26
5.3.2.1.1 Test conditions . 26
5.3.2.1.2 Procedure . 26
5.3.2.2 Receiver Saturation Level and Dynamic Range . 27
5.3.2.2.1 Test conditions . 27
5.3.2.2.2 Procedure . 28
5.3.2.3 Receiver blocking . 28
5.3.2.3.1 Test conditions . 28
5.3.2.3.2 Procedure . 28
5.3.2.4 Receiver selectivity . 30
5.3.2.4.1 Test conditions . 30
5.3.2.4.2 Procedure . 30
5.3.2.5 Inter-modulation response rejection . 31
5.3.2.5.1 Test conditions . 31
5.3.2.5.2 Procedure . 31
ETSI

---------------------- Page: 4 ----------------------
5 Draft ETSI EN 303 363-1 V1.0.1 (2020-12)
5.3.2.6 Receiver co-channel rejection . 32
5.3.2.6.1 Test conditions . 32
5.3.2.6.2 Procedure . 33
5.3.2.7 Receiver Noise Figure . 33
5.3.2.7.1 Test conditions . 33
5.3.2.7.2 Procedure . 33
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 34
Annex B (normative): Measurement setups . 36
B.1 Setup 1 . 36
B.2 Setup 2 . 37
B.3 Setup 3 . 38
B.4 Setup 4 . 39
B.5 Setup 5 . 40
Annex C (informative): Checklist . 42
Annex D (informative): Maximum Measurement Uncertainty . 43
History . 44


ETSI

---------------------- Page: 5 ----------------------
6 Draft ETSI EN 303 363-1 V1.0.1 (2020-12)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM), and is now submitted for the combined Public Enquiry and Vote
phase of the ETSI standards EN Approval Procedure.
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.2] to
provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation
of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC [i.1].
Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of the present document given in Table A.1 confers, within the limits of the scope of the present
document, a presumption of conformity with the corresponding essential requirements of that Directive, and associated
EFTA regulations.
The present document is part 1 of a multi-part deliverable covering ATC Secondary Surveillance Radar systems for
civil air navigation operating in the frequencies 1 030 MHz and 1 090 MHz, as identified below:
Part 1: "SSR Interrogator";
Part 2: "Far Field Monitor (FFM)".
Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

ETSI

---------------------- Page: 6 ----------------------
7 Draft ETSI EN 303 363-1 V1.0.1 (2020-12)
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
The SSR system provides ground-based surveillance of transponder fitted aircraft and in addition may allow data link
communication between ground stations and aircraft, where both are fitted with appropriate equipment.
Secondary Radar surveillance is exploited through two essential elements: the SSR interrogator, normally
ground-based, and the aircraft SSR transponder. When aircraft are within the antenna beam of the ground station, its
interrogations elicit replies from transponders.
Civil use systems have different modes of interrogation/reply: Mode A, Mode C, Mode S and intermode. Mode A,
Mode C and Intermode interrogations consist of pulse amplitude modulated (PAM) signals, Mode-S interrogations have
an additional pulse, with differential phase keying (DPSK) modulation.
Ground stations will be either Mode A/C ground stations, which can interrogate and receive replies on Mode A/C only,
or Mode S ground stations, for which the present standard founds its applicability, which can interrogate and receive
replies on all modes. On the other side, there are two classes of transponders: Mode A/C transponders, which can
respond to Mode A, Mode C and Intermode interrogations only, and Mode S transponders, which can respond to all
modes. Mode-S interrogation/replies have different data block depending on the information they have to support.
As far as Mode S is concerned, for the purpose of the present document it is assumed that the SSR can transmit
interrogations at least in the uplink formats (UF) UF11, UF4 and UF5 and can process replies in the downlink formats
(DF) DF11, DF4, DF20, DF5 and DF21.
The replies to all modes of interrogation are used to determine aircraft 2D position by measurement of the range and
bearing of the reply. The performance towards the radar parameters are determined on the basis of the number of
correct and validated replies received and decoded, in the operating environment.
Performances are affected by interference effects, which can result in a degradation of the signal causing lost or wrong
information. RF signals on either uplink or downlink can be distorted by other overlapping RF signals, which can make
correct decoding of wanted signals impossible. The degree of degradation is a function of the channel loading.
The SSR system requires a 3 dB receiver bandwidth of approximately 8 MHz centered on 1 030 MHz and 1 090 MHz
for the airborne transponder and ground SSR receiver respectively. This bandwidth is sufficient to permit significant
co-channel interference from transmitters operating on adjacent frequencies.
This interference can be minimized by ensuring adequate frequency or spatial separation between the interfering
transmitters and the SSR receivers. In this specific case, two air traffic service systems, DME and p
...

SLOVENSKI STANDARD
oSIST prEN 303 363-1 V1.0.1:2021
01-februar-2021
Radarski senzorji za nadzor zračnega prometa - Sekundarni nadzorni radar (SSR) -
Harmonizirani standard za dostop do radijskega spektra - 1. del: Bralnik SSR
Air Traffic Control Surveillance Radar Sensors - Secondary Surveillance Radar (SSR) -
Harmonised Standard for access to radio spectrum - Part 1: SSR Interrogator
Ta slovenski standard je istoveten z: ETSI EN 303 363-1 V1.0.1 (2020-12)
ICS:
03.220.50 Zračni transport Air transport
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
oSIST prEN 303 363-1 V1.0.1:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 303 363-1 V1.0.1:2021

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oSIST prEN 303 363-1 V1.0.1:2021
Draft ETSI EN 303 363-1 V1.0.1 (2020-12)






HARMONISED EUROPEAN STANDARD
Air Traffic Control Surveillance Radar Sensors;
Secondary Surveillance Radar (SSR);
Harmonised Standard for access to radio spectrum;
Part 1: SSR Interrogator

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oSIST prEN 303 363-1 V1.0.1:2021
 2 Draft ETSI EN 303 363-1 V1.0.1 (2020-12)



Reference
DEN/ERM-TGAERO-30-1
Keywords
aeronautical, harmonised standard, radar, radio
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oSIST prEN 303 363-1 V1.0.1:2021
 3 Draft ETSI EN 303 363-1 V1.0.1 (2020-12)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 7
Introduction . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 12
3.3 Abbreviations . 12
4 Technical requirements specifications . 13
4.1 Environmental profile . 13
4.2 Conformance requirements . 13
4.2.1 Transmitter requirements . 13
4.2.1.1 Maximum frequency deviation . 13
4.2.1.1.1 Definition. 13
4.2.1.1.2 Limits . 13
4.2.1.1.3 Conformance . 13
4.2.1.2 Transmitter power . 13
4.2.1.2.1 Definition. 13
4.2.1.2.2 Limits . 13
4.2.1.2.3 Conformance . 13
4.2.1.3 Transmitter power control . 13
4.2.1.3.1 Definition. 13
4.2.1.3.2 Limits . 13
4.2.1.3.3 Conformance . 14
4.2.1.4 Spectrum mask . 14
4.2.1.4.1 Definition. 14
4.2.1.4.2 Limits . 14
4.2.1.4.3 Conformance . 15
4.2.1.5 Emissions in idle mode . 15
4.2.1.5.1 Definition. 15
4.2.1.5.2 Limits . 15
4.2.1.5.3 Conformance . 15
4.2.1.6 Transmitted waveforms . 15
4.2.1.6.1 Definition. 15
4.2.1.6.2 Limits . 16
4.2.1.6.3 Conformance . 16
4.2.2 Receiver requirements . 16
4.2.2.1 Receiver sensitivity and flatness . 16
4.2.2.1.1 Definition. 16
4.2.2.1.2 Limits . 16
4.2.2.1.3 Conformance . 17
4.2.2.2 Receiver Saturation Level and Dynamic Range . 17
4.2.2.2.1 Definition. 17
4.2.2.2.2 Limits . 17
4.2.2.2.3 Conformance . 17
4.2.2.3 Receiver blocking . 18
4.2.2.3.1 Definition. 18
4.2.2.3.2 Limits . 18
4.2.2.3.3 Conformance . 18
ETSI

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4.2.2.4 Receiver selectivity . 18
4.2.2.4.1 Definition. 18
4.2.2.4.2 Limits . 18
4.2.2.4.3 Conformance . 18
4.2.2.5 Inter-modulation response rejection . 19
4.2.2.5.1 Definition. 19
4.2.2.5.2 Limits . 19
4.2.2.5.3 Conformance . 19
4.2.2.6 Receiver co-channel rejection . 19
4.2.2.6.1 Definition. 19
4.2.2.6.2 Limits . 19
4.2.2.6.3 Conformance . 19
4.2.2.7 Receiver Noise Figure . 19
4.2.2.7.1 Definition. 19
4.2.2.7.2 Limits . 19
4.2.2.7.3 Conformance . 19
5 Testing for compliance with technical requirements . 20
5.1 General requirements . 20
5.1.1 Standard operation mode for testing . 20
5.2 Environmental conditions for testing . 20
5.2.1 Test Conditions . 20
5.2.2 Normal temperature and humidity . 20
5.2.3 Normal test power supply . 20
5.3 Test specifications . 21
5.3.1 Transmitter related tests . 21
5.3.1.0 General requirements . 21
5.3.1.1 Maximum frequency deviation . 21
5.3.1.1.1 Test conditions . 21
5.3.1.1.2 Procedure . 21
5.3.1.2 Transmitter power . 21
5.3.1.2.1 Test conditions . 21
5.3.1.2.2 Procedure . 21
5.3.1.3 Transmitter power control . 22
5.3.1.3.1 Test conditions . 22
5.3.1.3.2 Procedure . 22
5.3.1.4 Spectrum mask . 23
5.3.1.4.1 Test conditions . 23
5.3.1.4.2 Procedure . 23
5.3.1.5 Emissions in idle mode . 24
5.3.1.5.1 Test conditions . 24
5.3.1.5.2 Procedure . 24
5.3.1.6 Transmitted Waveforms . 25
5.3.1.6.1 Test conditions . 25
5.3.1.6.2 Procedure . 25
5.3.2 Receiver related tests . 26
5.3.2.0 General requirements . 26
5.3.2.1 Receiver sensitivity and flatness . 26
5.3.2.1.1 Test conditions . 26
5.3.2.1.2 Procedure . 26
5.3.2.2 Receiver Saturation Level and Dynamic Range . 27
5.3.2.2.1 Test conditions . 27
5.3.2.2.2 Procedure . 28
5.3.2.3 Receiver blocking . 28
5.3.2.3.1 Test conditions . 28
5.3.2.3.2 Procedure . 28
5.3.2.4 Receiver selectivity . 30
5.3.2.4.1 Test conditions . 30
5.3.2.4.2 Procedure . 30
5.3.2.5 Inter-modulation response rejection . 31
5.3.2.5.1 Test conditions . 31
5.3.2.5.2 Procedure . 31
ETSI

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5.3.2.6 Receiver co-channel rejection . 32
5.3.2.6.1 Test conditions . 32
5.3.2.6.2 Procedure . 33
5.3.2.7 Receiver Noise Figure . 33
5.3.2.7.1 Test conditions . 33
5.3.2.7.2 Procedure . 33
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 34
Annex B (normative): Measurement setups . 36
B.1 Setup 1 . 36
B.2 Setup 2 . 37
B.3 Setup 3 . 38
B.4 Setup 4 . 39
B.5 Setup 5 . 40
Annex C (informative): Checklist . 42
Annex D (informative): Maximum Measurement Uncertainty . 43
History . 44


ETSI

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oSIST prEN 303 363-1 V1.0.1:2021
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Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM), and is now submitted for the combined Public Enquiry and Vote
phase of the ETSI standards EN Approval Procedure.
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.2] to
provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation
of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC [i.1].
Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of the present document given in Table A.1 confers, within the limits of the scope of the present
document, a presumption of conformity with the corresponding essential requirements of that Directive, and associated
EFTA regulations.
The present document is part 1 of a multi-part deliverable covering ATC Secondary Surveillance Radar systems for
civil air navigation operating in the frequencies 1 030 MHz and 1 090 MHz, as identified below:
Part 1: "SSR Interrogator";
Part 2: "Far Field Monitor (FFM)".
Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

ETSI

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oSIST prEN 303 363-1 V1.0.1:2021
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Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
The SSR system provides ground-based surveillance of transponder fitted aircraft and in addition may allow data link
communication between ground stations and aircraft, where both are fitted with appropriate equipment.
Secondary Radar surveillance is exploited through two essential elements: the SSR interrogator, normally
ground-based, and the aircraft SSR transponder. When aircraft are within the antenna beam of the ground station, its
interrogations elicit replies from transponders.
Civil use systems have different modes of interrogation/reply: Mode A, Mode C, Mode S and intermode. Mode A,
Mode C and Intermode interrogations consist of pulse amplitude modulated (PAM) signals, Mode-S interrogations have
an additional pulse, with differential phase keying (DPSK) modulation.
Ground stations will be either Mode A/C ground stations, which can interrogate and receive replies on Mode A/C only,
or Mode S ground stations, for which the present standard founds its applicability, which can interrogate and receive
replies on all modes. On the other side, there are two classes of transponders: Mode A/C transponders, which can
respond to Mode A, Mode C and Intermode interrogations only, and Mode S transponders, which can respond to all
modes. Mode-S interrogation/replies have different data block depending on the information they have to support.
As far as Mode S is concerned, for the purpose of the present document it is assumed that the SSR can transmit
interrogations at least in the uplink formats (UF) UF11, UF4 and UF5 and can process replies in the downlink formats
(DF) DF11, DF4, DF20, DF5 and DF21.
The replies to all modes of interrogation are used to
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