SIST EN 302 842-3 V1.4.1:2015

EUROPEAN STANDARD
VHF air-ground and air-air Digital Link (VDL)
Mode 4 radio equipment;
Technical characteristics and methods of measurement
for aeronautical mobile (airborne) equipment;
Part 3: Additional broadcast aspects

2 ETSI EN 302 842-3 V1.4.1 (2015-04)

Reference
REN/AERO-00019-3
Keywords
aeronautical, digital, radio, testing, VHF
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3 ETSI EN 302 842-3 V1.4.1 (2015-04)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 6
1 Scope . 7
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 8
3 Definitions and abbreviations . 9
3.1 Definitions . 9
3.1.1 Basic reference model definitions . 9
3.1.2 Service conventions definitions . 9
3.1.3 General definitio ns . 9
3.1.4 Definition of bit order . 10
3.2 Abbreviations . 10
4 General description of VDL Mode 4 broadcast services . 12
4.1 General . 12
4.2 Automatic Dependent Surveillance-Broadcast (ADS-B) . 12
4.3 Traffic Information Service-Broadcast (TIS-B) . 13
4.4 Flight Information Service-Broadcast (FIS-B) . 14
4.5 GNSS Augmentation Service-Broadcast (GNS-B) . 15
5 Minimum performance specification under standard test conditions . 16
5.1 Requirements for ADS-B . 16
5.1.1 Information Field Formats . 16
5.1.2 ADS-B Request . 26
5.1.2.1 ADS-B request format. 26
5.1.2.2 Sleep Mode . 26
5.1.2.3 Automatic Selection of Variable Information Fields . 26
5.1.3 Default ADS-B Reporting . 29
5.1.4 ADS-B Procedures . 29
5.1.5 CTRL Parameters . 31
5.1.5.1 Directory of Service (DOS) message . 31
5.1.5.2 Channel Management Parameter . 32
5.1.6 Definitions for Compact Position Reporting . 42
5.1.6.1 Information Field Offset Encoding . 42
5.1.6.2 Information Field Offset Decoding . 44
5.1.6.3 Patch ID Encoding . 45
5.1.6.4 Patch Id Decoding . 45
5.1.7 Encoding of UDATA (udid) . 46
5.2 Requirements for TIS-B . 46
5.2.1 Traffic Information Volume (TIV) . 46
5.2.2 Void . 46
5.2.3 Message format . 46
5.2.4 Management message . 47
5.2.5 Aircraft target messages (airborne TIV) . 49
5.2.6 Aircraft target messages (ground TIV) . 51
5.2.7 Ground vehicle target messages (ground TIV) . 52
5.2.8 TIS-B offset encoding . 53
5.3 Requirements for FIS-B . 56
5.3.1 Message format for received FIS-B messages . 56
5.3.2 Meteorological Aerodrome Report (METAR) message . 57
5.3.3 Special Observations and Reports (SPECI) message . 64
5.3.4 Automatic Terminal Information Service (ATIS) message . 65
5.3.5 Runway Condition (RCN) message . 67
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4 ETSI EN 302 842-3 V1.4.1 (2015-04)
5.3.6 SIGnificant METeorological Information (SIGMET) message . 71
5.3.7 Temporary Segregated Areas (TSA) message . 72
5.3.8 FIS-B report request message . 75
5.3.9 Void . 76
5.3.9a Airborne system functions . 76
5.3.9a.1 Transmission of requests . 76
5.3.9a.2 Differentiation between reports . 76
5.4 Requirements for GNSS Augmentation Service Broadcast (GNS-B) message . 77
5.4.1 Message format . 77
5.4.2 Message Type 1 . 78
5.4.3 Message Type 2 . 81
5.4.4 Message Type 4 . 84
5.4.5 CRC Calculation . 90
5.4.5.1 GNS-B CRC . 90
5.4.5.2 FAS CRC . 90
5.4.5.3 Ephemeris CRC . 91
6 General design requirements . 91
7 Protocol test procedures . 91
7.1 General . 91
7.2 Required test rig . 92
7.3 Protocol test-suite description methodology . 92
7.4 Detailed protocol test procedures . 92
7.4.1 Test-suite overview . 92
7.4.2 Declarations . 95
7.4.3 Constraints . 96
7.4.3.1 Abbreviations . 96
7.4.3.1.1 Subfield mnemonics . 96
7.4.3.1.2 Station addresses and positions . 99
7.4.3.1.3 Tables of values for use in CPR test cases . 100
7.4.3.1.4 Tables of values for use in content checking test cases . 112
7.4.3.1.5 VDL4 Burst formats . 146
7.4.3.2 Test cases . 180
7.4.3.2.1 Test case macros . 181
7.4.3.2.2 Test case descriptions . 182
Annex A (informative): Cross reference matrix . 261
Annex B (informative): Bibliography . 271
History . 272

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5 ETSI EN 302 842-3 V1.4.1 (2015-04)
Intellectual Property Rights
IPRs essential or potentially essential to the present document 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 (http://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.
Foreword
This European Standard (EN) has been produced by ETSI Technical Committee Aeronautics (AERO).
The present document is part 3 of a multi-part deliverable covering the VHF air-ground and air-air Digital Link (VDL)
Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne)
equipment, as identified below:
Part 1: "Physical layer";
Part 2: "General description and data link layer";
Part 3: "Additional broadcast aspects";
Part 4: "Point-to-point functions".
The present document is accompanied by an equivalent ground-based standard, ETSI EN 301 842 [i.7] parts 1 to 5,
covering the VHF air-ground Data Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of
measurement for ground-based equipment.
NOTE: Minimum Operational Performance Specifications (MOPS) are also being developed for VDL Mode 4.
EUROCAE have previously published Interim MOPS for VDL Mode 4 [i.6] which are a sub set of ETSI
EN 302 842-1 [1], ETSI EN 302 842-2 [2], ETSI EN 302 842-3 (the present document) and ETSI
EN 302 842-4 [3]. ETSI EN 302 842-1 [1], ETSI EN 302 842-2 [2], ETSI EN 302 842-3 (the present
document) and ETSI EN 302 842-4 [3] comply with the requirements of CEC Mandate M/318 [i.8].

National transposition dates
Date of adoption of this EN: 6 April 2015
Date of latest announcement of this EN (doa): 31 July 2015
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 January 2016
Date of withdrawal of any conflicting National Standard (dow): 31 January 2017

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.
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6 ETSI EN 302 842-3 V1.4.1 (2015-04)
Introduction
The present document states the technical specifications for Very High Frequency (VHF) Digital Link (VDL) Mode 4
aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air communications
operating in the VHF band, using Gaussian Filtered Frequency Shift Keying (GFSK) modulation with 25 kHz channel
spacing and capable of tuning to any of the 25 kHz channels from 112,000 MHz to 136,975 MHz as defined in ICAO
VDL SARPs [i.2].
The present document may be used to produce tests for the assessment of the performance of the equipment. The
performance of the equipment submitted for type testing should be representative of the performance of the
corresponding production model.
The present document has been written on the assumption that:
• the type test measurements will be performed only once, in an accredited test laboratory and the measurements
accepted by the various authorities in order to grant type approval;
• if equipment available on the market is required to be checked it will be tested in accordance with the methods
of measurement specified in the present document or a documented alternative approved by the certifying
authority;
• equipment complies with ETSI EN 302 842-1 [1] and ETSI EN 302 842-2 [2].
NOTE: The present document has been produced with a view to maintaining consistency of numbering with the
equivalent standard for ground equipment (ETSI EN 301 842 [i.7] parts 1 to 4). Where requirements are
the same, they have been given the same number. Some new airborne requirements have been inserted
between requirements that were sequential in ETSI EN 301 842 [i.7] parts 1 to 4. This has led to a
non-standard form of numbering for new requirements in some places.
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7 ETSI EN 302 842-3 V1.4.1 (2015-04)
1 Scope
The present document applies to the following radio equipment types:
• Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters,
transceivers and receivers for air-ground and air-air communications operating in the VHF band, using
Gaussian Filtered Frequency Shift Keying (GFSK) modulation with 25 kHz channel spacing and capable of
tuning to any of the 25 kHz channels from 112,000 MHz to 136,975 MHz as defined in ICAO VDL
SARPs [i.2].
The present document provides part 3 of the technical specifications.
The present document is designed to ensure that equipment certified to it will be compatible with the relevant ICAO
VDL SARPs [i.2] and ICAO VDL4 Technical Manual [i.1].
Manufacturers should note that in future the tuning range for the transmitter and the receiver may also cover any 25 kHz
channel from 108,000 MHz to 111,975 MHz.
The present document applies to "aeronautical mobile (airborne and in some cases ground vehicles)" equipment which
will hereinafter be referred to as "mobile" equipment.
The scope of the present document is limited to mobile stations. The equivalent specification for ground stations is
ETSI EN 301 842 [i.7].
A description of the scope of the VDL Mode 4 system is provided in part 2 of these technical specifications
(see ETSI EN 302 842-2 [2], clause 1).
ETSI EN 302 842-1 [1] deals with tests of the physical layer. ETSI EN 302 842-2 [2] deals with tests of the link layer
sufficient to support broadcast functionality including requirements and tests sufficient to recognize and respond to
transmissions associated with point-to-point communication. The present document provides technical specifications
for a VDL Mode 4 mobile transceiver supporting a full Automatic Dependent Surveillance-Broadcast (ADS-B)
capability and, optionally, the additional functionality of either, or a combination of, the following services:
• Traffic Information Service-Broadcast (TIS-B);
• Flight Information Service-Broadcast (FIS-B);
• GNSS Augmentation Service-Broadcast (GNS-B).
The TIS-B, FIS-B, or GNS-B reception processing functionality in the airborne equipment is expected to be provided
by a TIS-B, FIS-B or GNS-B processor, which could be contained within the VDL Mode 4 transceiver, but could also
be housed in a separate physical unit. Therefore to support TIS-B, FIS-B or GNS-B message reception, the minimum
functionality demanded of a basic VDL Mode 4 airborne transceiver unit (i.e. one that does not have a TIS-B, FIS-B or
GNS-B processor housed within it) is to pass to the TIS-B, FIS-B or GNS-B processor, all TIS-B, FIS-B or GNS-B
messages received.
As the measured values of equipment performance may be a function of the method of measurement, standard test
conditions and methods of test are recommended in the present document.
The present document is organized as follows:
• clause 2 provides references to relevant documents;
• clause 3 provides general definitions, abbreviations and symbols used;
• clause 4 describes the VDL Mode 4 mobile station functionality to support ADS-B, TIS-B, FIS-B and GNS-B;
• clause 5 provides performance specifications for the VDL Mode 4 mobile station supporting ADS-B, TIS-B,
FIS-B and GNS-B Services;
• clause 6 provides general design requirements;
• clause 7 provides protocol tests which emphasis the ADS-B, TIS-B, FIS-B and GNS-B functions of the
system;
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8 ETSI EN 302 842-3 V1.4.1 (2015-04)
• annex A provides a detailed cross-reference to the relevant requirements contained in ICAO VDL4
Technical Manual [i.1];
• annex B provides a Bibliography.
Note that the system can support a very wide range of functions. It is not practical to provide specific tests for all
aspects of functionality. The approach used is to provide detailed tests for the core functionality to support ADS-B,
FIS-B, TIS-B and GNS-B focusing on the system requirements which, if wrongly implemented, could cause a
deterioration in the service offered by other VDL Mode 4 stations.
Mandating and Recommendation Phrases
a) "Shall":
- The use of the word "Shall" indicates a mandated criterion; i.e. compliance with the particular procedure
or specification is mandatory and no alternative may be applied.
b) "Should":
- The use of the word "Should" (and phrases such as "It is recommended that.", etc.) indicates that though
the procedure or criterion is regarded as the preferred option, alternative procedures, specifications or
criteria may be applied, provided that the manufacturer, installer or tester can provide information or data
to adequately support and justify the alternative.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 302 842-1 (V1.3.1): "VHF air-ground and air-air Digital Link (VDL) Mode 4 radio
equipment; Technical characteristics and methods of measurement for aeronautical mobile
(airborne) equipment; Part 1: Physical layer".
[2] ETSI EN 302 842-2 (V1.4.1): "VHF air-ground and air-air Digital Link (VDL) Mode 4 radio
equipment; Technical characteristics and methods of measurement for aeronautical mobile
(airborne) equipment; Part 2: General description and data link layer".
[3] ETSI EN 302 842-4 (V1.3.1): "VHF air-ground and air-air Digital Link (VDL) Mode 4 radio
equipment; Technical characteristics and methods of measurement for aeronautical mobile
(airborne) equipment; Part 4: Point-to-point functions".
[4] WMO Publication No. 306: "Manual on Codes Vol 1.1, Part A".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
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9 ETSI EN 302 842-3 V1.4.1 (2015-04)
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ICAO Doc 9816 (First Edition 2004): "Manual on VHF Digital Link (VDL) Mode 4 - Part 2:
Detailed Technical Specifications".
[i.2] ICAO Annex 10 to the Convention on International Civil Aviation: "Aeronautical
Telecommunications, Volume III: Communication Systems, Part I: Digital Data Communication
Systems, chapter 6", including Amendment 88 (applicable 14/11/13).
[i.3] RTCA DO-242A: "Minimum Aviation System Performance Standards for Automatic Dependent
Surveillance Broadcast (ADS-B)".
[i.4] Amendments 76 and 77 to Volume I of Annex 10 to the Convention on International Civil
Aviation, International Civil Aviation Organization: Appendix B-B2, 3.6 "Ground-based
augmentation system (GBAS)".
NOTE: http://www.icao.int.
[i.5] EUROCAE ED-114A: "Minimum Operational Performance Specification for Global Navigation
Satellite Ground Based Augmentation System Ground Equipment to Support Category I
Operations".
NOTE: http://www.eurocae.net.
[i.6] EUROCAE ED-108A: "MOPS for VDL Mode 4 Aircraft Transceiver for ADS-B", July 2001.
[i.7] ETSI EN 301 842 (all parts): "VHF air-ground Digital Link (VDL) Mode 4 radio equipment;
Technical characteristics and methods of measurement for ground-based equipment".
[i.8] CEC Mandate M/318: "Mandate to CEN/CENELEC/ETSI for standardisation in the field of air
traffic management systems and Galileo local components".
3 Definitions and abbreviations
3.1 Definitions
3.1.1 Basic reference model definitions
See ETSI EN 302 842-2 [2], clause 3.1.1.
3.1.2 Service conventions definitions
See ETSI EN 302 842-2 [2], clause 3.1.2.
3.1.3 General definitions
For the purposes of the present document, the terms and definitions given in ETSI EN 302 842-1 [1], clause 3.1.3,
ETSI EN 302 842-2 [2], clause 3.1.3 and the following apply:
Automatic Dependent Surveillance-Broadcast (ADS-B): surveillance application transmitting parameters, such as
position, track, ground speed and time via a broadcast mode data link for use by any air and ground users requiring it
NOTE: ADS-B is a surveillance service based on aircraft self-determination of position/velocity/time and
automatic, periodic, broadcast of this information along with auxiliary data such as aircraft identity (ID),
intent information and communications control parameters, etc. ADS-B is intended to support multiple
high-level applications and associated services such as cockpit display of traffic information, traffic alert
and collision avoidance functionality, enhanced traffic management in the air and on the ground, search
and rescue support and others.
Automatic Terminal Information Service (ATIS): report generated by a ground station that includes weather
conditions, operating procedures, runways and approaches in use, and any other information that may affect the
departure, runway and landing phase of flight
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10 ETSI EN 302 842-3 V1.4.1 (2015-04)
Flight Information Service-Broadcast (FIS-B): uplink broadcast application providing local airborne traffic with
information
GNSS augmentation Service-Broadcast (GNS-B): uplink broadcast application providing aircraft with GNSS
augmentation and integrity data
METeorological Aerodrome Report (METAR): report generated by a ground station that broadcasts meteorological
conditions at aerodromes, officially recoded and communicated at regular intervals
SIGnificant METeorological Information (SIGMET): report generated by a ground station that broadcasts
information about weather phenomena that may have an impact on aircraft at subsonic, transonic and supersonic
cruising levels including thunderstorms, cyclones, turbulence and icing
SPECIal observations and reports (SPECI): report generated by a ground station that is issued when meteorological
conditions change sufficiently to affect aviation operations
NOTE: The SPECI report contains the same information as a METAR.
Traffic Information Service-Broadcast (TIS-B): uplink surveillance service that derives traffic information from one
or more ground surveillance sources and broadcasts that information to suitably equipped aircraft or surface vehicles
Traffic Information Volume (TIV): volume of airspace for which surveillance information is provided for all targets
NOTE: Inside the TIV, a pilot knows he can rely on the surveillance picture presented to him; outside the TIV,
ADS-B reports may be received but TIS-B reports may not be available.
3.1.4 Definition of bit order
In the tables included in the present document to illustrate the format of bursts, the following order is implied:
a) bit order in each burst subfield are indicated by subscript numbers. Bit 1 indicates the least significant bit; and
b) bits are transmitted octet by octet, starting with the first octet in each table, and within each octet the rightmost
bit (as shown in the tables) is transmitted first.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACAS Airborne Collision Avoidance System
ADS Automatic Dependent Surveillance
ADS-B Automatic Dependent Surveillance-Broadcast
ATC Air Traffic Control
ATIS Automatic Terminal Information Service
ATM Air Traffic Management
BND Big Negative Dither
CCI Co-Channel Interference
CDTI Cockpit Display of Traffic Information
CPR Compact Position Reporting
CRC Cyclic Redundancy Code
CSA Call Segment Association
CTRL ConTRoL
dB deciBel
DFPAP Delta Flight Path Alignment Point
DLPDU Data Link Protocol Data Unit
DLS Data Link Service
DOS Directory Of Services
DT Directed Timeout
EGNOS European Geostationary Navigation Overlay Service
EPU Estimated Position Uncertainty
EUROCAE EURopean Organization for Civil Aviation Equipment
FAS Final Approach Segment
FIR Flight Information Region
FIS Flight Information Service
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11 ETSI EN 302 842-3 V1.4.1 (2015-04)
FIS-B Flight Information Service-Broadcast
FPAP Flight Path Alignment Point
fpm feet per minute
fps feet per second
FTP Fictitious Threshold Point
GBAS Ground-Based Augmentation System
GCID GNS-B Continuity / Integrity Designator
GFSK Gaussian Filtered Frequency Shift Keying
GLONASS GLObal NAvigation Satellite System (Russian system)
GNS-B GNSS augmentation Service-Broadcast
GNSS Global Navigation Satellite System
GPA Glide Path Angle
GPS Global Positioning System
GRAS Ground-based Regional Augmentation System
GSC Global Signalling Channel
hex hexadecimal
IA International Alphabet
IA-5 International Alphabet-5
ICAO International Civil Aviation Organization
ID IDentity
ILS Instrument Landing System
INFO INFOrmation (DLPDU)
IRVR Instrumented RVR
LSB Least Significant Bit
LTP Landing Threshold Point
MASPS Minimum Aviation System Performance Standards
MEDUP MEDiterranean Update Programme
METAR METeorological Aerodrome Report
MLS Microwave Landing System
MOPS Minimum Operational Performance Specification
ms milliseconds
MSAS Multi-functional Satellite Augmentation System
MSB Most Significant Bit
NAC Network Access Credentials
NDB Non-Directional Beacon
NEAN North European ADS-B Network
NES Network End System
NIC Navigation Integrity Category
NM Nautical Mile
NTM NT1 Test Mode/Network Traffic Management
NUP NEAN Update Programme
PCO Point of Control and Observation
PRN Pseudo Random Noise
RCM Remote Command Message
RCN Runway Condition
RF Radio Frequency
RR Receiver Position Vector
RVR Routing Verification Result
SARPs Standards And Recommended Practices
SBAS Space-Based Augmentation System
SIGMET SIGnificant METeorological information
SIL Surveillance Integrity Level
SPECI SPECIal observations and reports
SPI Special Position Indicator
SST Sea Surface Temperature
SVQ State Vector Quality
TBD To Be Defined
TCH Threshold Crossing Height
TCP Trajectory Change Point
TIS Traffic Information Service
TIS-B Traffic Information Service-Broadcast
TIV Traffic Information Volume
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12 ETSI EN 302 842-3 V1.4.1 (2015-04)
TSA Temporary Segregated Areas
TV Transmission Volume
TWR Tower
UCTRL Unacknowledged ConTRoL data broadcast (DLPDU)
UTC Universal Time Coordinated
VDF VHF Direction Finding
VDL VHF Digital Link
VEPU Vertical Estimated Position Uncertainty
VHF Very High Frequency
VOR VHF Omnidirectional Radio
VSS VDL Mode 4 Specific Services
WAAS Wide Area Augmentation System
WGS World Geodetic System
NOTE: As in WGS-84: World Geodetic System 1984.
WMO World Meteorological Organization
XOR Exclusive OR
4 General description of VDL Mode 4 broadcast
services
4.1 General
A description of VDL Mode 4 is provided in clause 4.1 of ETSI EN 302 842-2 [2]. This clause provides a description of
the assumptions made in the derivation of the requirements for the VDL Mode 4 mobile station.
In most respects, the VDL Mode 4 mobile station follows the provisions of the ICAO standards material for VDL
Mode 4. Within the ICAO standard, there are some requirements that apply explicitly only to ground stations. A number
of other requirements will also not apply because of the assumed services provided by the mobile station. The assumed
services provided by the mobile station and the impact on the requirements are summarized in the rest of clause 4.
The scope of the present document is for a mobile station supporting broadcast applications. Hence the ability to
support point-to-point communication is not included in the present document. Those requirements are presented in
ETSI EN 302 842-4 [3].
Note that, although certain protocols will not be used by the mobile station, the ability to recognize the use by mobiles
of these protocols and to respond in a consistent manner is a mobile station requirement and is included in the present
document.
4.2 Automatic Dependent Surveillance-Broadcast (ADS-B)
Automatic Dependent Surveillance-Broadcast (ADS-B) is a surveillance application in which aircraft, vehicles and
ground stations broadcast their identity, position, velocity, time, intent and other information, enabling other aircraft,
vehicles and ground stations to develop a surveillance picture.
ADS-B relies on the regular and frequent transmission of position reports via a broadcast data link. The position reports
are sent periodically by the aircraft with no intervention from the ground. Position reports may be received by any
recipient in range of the transmitting aircraft. Recipients may be other aircraft, ground vehicles or fixed ground sites.
ADS-B offers data delivery from aircraft-to-aircraft or from aircraft-to-ground. Transmitting data directly from
air-to-air means that there is no need for a ground infrastructure to be present for airborne surveillance to be performed.
By using position reports received from surrounding aircraft, a traffic surveillance picture can be generated in the
cockpits of all of the aircraft. This potentially allows new applications or new manoeuvres to be performed by pilots.
The transmitting aircraft does not know which, if any, recipients are receiving and processing the position reports.
Unlike a point-to-point link, position reports are not acknowledged. The concept with ADS-B is that position reports are
transmitted so frequently that the loss of a small number of position reports is not operationally significant.
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13 ETSI EN 302 842-3 V1.4.1 (2015-04)
ADS-B messages are broadcast and received by appropriately equipped participant subsystems. ADS-B subsystems
include aircraft, vehicles and ground subsystems. The capabilities of participant subsystems will vary based upon class
of equipage. The ADS-B aircraft subsystem interacts with other onboard systems such as pilot display equipment and
the aircraft navigation system. The ADS-B ground subsystem interacts with other ground systems such as ATM
applications and controller display processing equipment.
If received by a data acquisition unit, the position report will be processed with other surveillance data and may be
forwarded to a controller/pilot display.
Airborne VDL Mode 4 stations supporting full ADS-B capability:
• Receive and process the ADS-B reports from other aircraft, vehicles and ground stations, passing the received
data to a surveillance server.
• Transmit ADS-B reports at the required regular intervals (or more frequently) and including required and
possibly some optional information.
Figure 4.1 illustrates the context for the airborne station supporting ADS-B functions.

Other VDL
Mode 4 Stations
Broadcast Broadcast
Aircraft
Surveillance VDL Mode 4
and Display Airborne Station
with full ADS-B
Server
Figure 4.1: Airborne station supporting ADS-B functions
A VDL Mode 4 airborne station supporting ADS-B receives broadcast ADS-B reports and passes on the data to a
surveillance processor. A VDL Mode 4 airborne station supporting ADS-B may also receive data for transmission and
instructions for transmission rates from the surveillance processor.
The requirements for ADS-B are taken from the ICAO VDL 4 Technical Manual [i.1].
4.3 Traffic Information Service-Broadcast (TIS-B)
Traffic Information Service-Broadcast (TIS-B) is a surveillance service that derives traffic information from one or
more ground surveillance sources and broadcasts that information to suitably equipped aircraft or surface vehicles.
The purpose of TIS-B is to complement the surveillance information provided from ADS-B aircraft to ensure that a full
surveillance picture is available to airborne systems.
The TIS-B service is provided within an area known as the Traffic Information Volume (TIV), which is the volume of
airspace for which surveillance information is provided for all targets. Inside the TIV, a pilot knows he can rely on the
surveillance picture presented to him; outside the TIV, ADS-B reports may be received but TIS-B reports may not be
available.
A TIS-B service either provides a "full surveillance picture" or a "gap filler service". For the full surveillance picture,
information is provided on all targets. The "gap filler service" information is only provided for targets which do not
support ADS-B via VDL Mode 4.
A VDL Mode 4 airborne station supporting TIS-B receives two main sorts of message:
a) Management Messages: which contain information about the TIS-B service and the TIV.
ETSI
14 ETSI EN 302 842-3 V1.4.1 (2015-04)
b) Target Messages: which contain information about aircraft or ground vehicle targets.
Figure 4.2 illustrates the context for the airborne station supporting TIS-B.

Other VDL
Mode 4 Stations
TIS-B Broadcast
Broadcast
Aircraft
Surveillance and VDL Mode 4
Display Server Airborne Station
including TIS-B
Figure 4.2: Airborne station supporting TIS-B functions
A VDL Mode 4 airborne station supporting TIS-B receives broadcast TIS-B reports and passes on the data to a
surveillance processor that includes TIS-B processing capability. The present document therefore includes requirements
that apply to the part of the airborne equipment involved in TIS-B data processing, but this is not necessarily contained
within the VDL Mode 4 airborne station.
The requirements for TIS-B are taken from the TIS-B Service Description produced by the Mediterranean UpDate and
Nean Update programmes (MEDUP and NUP). Eurocontrol TIS-B Requirements have been taken into account in the
development of the present requirements.
4.4 Flight Information Service-Broadcast (FIS-B)
Flight Information Service-Broadcast (FIS-B) is an uplink broadcast application providing local traffic with
information.
The following message types are supported:
a) METeorological Aerodrome Report (METAR): report indicating meteorological conditions at aerodromes,
officially recoded and communicated at regular intervals. Intermediate observations are also recorded and
communicated when meteorological conditions change sufficiently to affect aviation operations (see SPECI).
b) Automatic Terminal Information Service (ATIS): report indicating weather conditions, operating procedures,
runways and approaches in use, and any other information that may affect the departure, runway and landing
phase of flight.
c) Runway Condition (RCN): report including information about the current runway visual range conditions and
any other runway condition that may affect the departure, runway and landing phases of flight.
d) SIGnificant METeorological information (SIGMET): report broadcasting information about weather
phenomena which may have an impact on aircraft at subsonic, transonic and supersonic cruising levels
including thunderstorms, cyclones, turbulence and icing.
e) SPECIal observations and reports (SPECI): report generated when meteorological conditions change
sufficientl
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment;Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment; Part 3: Additional broadcast aspects49.090On-board equipment and instruments33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:EN 302 842-3 V1.4.1SIST EN 302 842-3 V1.4.1:2015en,fr,de01-oktober-2015SIST EN 302 842-3 V1.4.1:2015SLOVENSKI
STANDARD
EUROPEAN STANDARD SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)2
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ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)3 Contents Intellectual Property Rights . 5 Foreword . 5 Modal verbs terminology . 5 Introduction . 6 1 Scope . 7 2 References . 8 2.1 Normative references . 8 2.2 Informative references . 8 3 Definitions and abbreviations . 9 3.1 Definitions . 9 3.1.1 Basic reference model definitions . 9 3.1.2 Service conventions definitions . 9 3.1.3 General definitions . 9 3.1.4 Definition of bit order . 10 3.2 Abbreviations . 10 4 General description of VDL Mode 4 broadcast services . 12 4.1 General . 12 4.2 Automatic Dependent Surveillance-Broadcast (ADS-B) . 12 4.3 Traffic Information Service-Broadcast (TIS-B) . 13 4.4 Flight Information Service-Broadcast (FIS-B) . 14 4.5 GNSS Augmentation Service-Broadcast (GNS-B) . 15 5 Minimum performance specification under standard test conditions . 16 5.1 Requirements for ADS-B . 16 5.1.1 Information Field Formats . 16 5.1.2 ADS-B Request . 26 5.1.2.1 ADS-B request format. 26 5.1.2.2 Sleep Mode . 26 5.1.2.3 Automatic Selection of Variable Information Fields . 26 5.1.3 Default ADS-B Reporting . 29 5.1.4 ADS-B Procedures . 29 5.1.5 CTRL Parameters . 31 5.1.5.1 Directory of Service (DOS) message . 31 5.1.5.2 Channel Management Parameter . 32 5.1.6 Definitions for Compact Position Reporting . 42 5.1.6.1 Information Field Offset Encoding . 42 5.1.6.2 Information Field Offset Decoding . 44 5.1.6.3 Patch ID Encoding . 45 5.1.6.4 Patch Id Decoding . 45 5.1.7 Encoding of UDATA (udid) . 46 5.2 Requirements for TIS-B . 46 5.2.1 Traffic Information Volume (TIV) . 46 5.2.2 Void . 46 5.2.3 Message format . 46 5.2.4 Management message . 47 5.2.5 Aircraft target messages (airborne TIV) . 49 5.2.6 Aircraft target messages (ground TIV) . 51 5.2.7 Ground vehicle target messages (ground TIV) . 52 5.2.8 TIS-B offset encoding . 53 5.3 Requirements for FIS-B . 56 5.3.1 Message format for received FIS-B messages . 56 5.3.2 Meteorological Aerodrome Report (METAR) message . 57 5.3.3 Special Observations and Reports (SPECI) message . 64 5.3.4 Automatic Terminal Information Service (ATIS) message . 65 5.3.5 Runway Condition (RCN) message . 67 SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)4 5.3.6 SIGnificant METeorological Information (SIGMET) message . 71 5.3.7 Temporary Segregated Areas (TSA) message . 72 5.3.8 FIS-B report request message . 75 5.3.9 Void . 76 5.3.9a Airborne system functions . 76 5.3.9a.1 Transmission of requests . 76 5.3.9a.2 Differentiation between reports . 76 5.4 Requirements for GNSS Augmentation Service Broadcast (GNS-B) message . 77 5.4.1 Message format . 77 5.4.2 Message Type 1 . 78 5.4.3 Message Type 2 . 81 5.4.4 Message Type 4 . 84 5.4.5 CRC Calculation . 90 5.4.5.1 GNS-B CRC . 90 5.4.5.2 FAS CRC . 90 5.4.5.3 Ephemeris CRC . 91 6 General design requirements . 91 7 Protocol test procedures . 91 7.1 General . 91 7.2 Required test rig . 92 7.3 Protocol test-suite description methodology . 92 7.4 Detailed protocol test procedures . 92 7.4.1 Test-suite overview . 92 7.4.2 Declarations . 95 7.4.3 Constraints . 96 7.4.3.1 Abbreviations . 96 7.4.3.1.1 Subfield mnemonics . 96 7.4.3.1.2 Station addresses and positions . 99 7.4.3.1.3 Tables of values for use in CPR test cases . 100 7.4.3.1.4 Tables of values for use in content checking test cases . 112 7.4.3.1.5 VDL4 Burst formats . 146 7.4.3.2 Test cases . 180 7.4.3.2.1 Test case macros . 181 7.4.3.2.2 Test case descriptions . 182 Annex A (informative): Cross reference matrix . 261 Annex B (informative): Bibliography . 271 History . 272
ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)5 Intellectual Property Rights IPRs essential or potentially essential to the present document 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 (http://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. Foreword This European Standard (EN) has been produced by ETSI Technical Committee Aeronautics (AERO). The present document is part 3 of a multi-part deliverable covering the VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment, as identified below: Part 1: "Physical layer"; Part 2: "General description and data link layer"; Part 3: "Additional broadcast aspects"; Part 4: "Point-to-point functions". The present document is accompanied by an equivalent ground-based standard, ETSI EN 301 842 [i.7] parts 1 to 5, covering the VHF air-ground Data Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment. NOTE: Minimum Operational Performance Specifications (MOPS) are also being developed for VDL Mode 4. EUROCAE have previously published Interim MOPS for VDL Mode 4 [i.6] which are a sub set of ETSI EN 302 842-1 [1], ETSI EN 302 842-2 [2], ETSI EN 302 842-3 (the present document) and ETSI EN 302 842-4 [3]. ETSI EN 302 842-1 [1], ETSI EN 302 842-2 [2], ETSI EN 302 842-3 (the present document) and ETSI EN 302 842-4 [3] comply with the requirements of CEC Mandate M/318 [i.8].
National transposition dates Date of adoption of this EN: 6 April 2015 Date of latest announcement of this EN (doa): 31 July 2015 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 January 2016 Date of withdrawal of any conflicting National Standard (dow): 31 January 2017
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. SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)6 Introduction The present document states the technical specifications for Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air communications operating in the VHF band, using Gaussian Filtered Frequency Shift Keying (GFSK) modulation with 25 kHz channel spacing and capable of tuning to any of the 25 kHz channels from 112,000 MHz to 136,975 MHz as defined in ICAO VDL SARPs [i.2]. The present document may be used to produce tests for the assessment of the performance of the equipment. The performance of the equipment submitted for type testing should be representative of the performance of the corresponding production model. The present document has been written on the assumption that: • the type test measurements will be performed only once, in an accredited test laboratory and the measurements accepted by the various authorities in order to grant type approval; • if equipment available on the market is required to be checked it will be tested in accordance with the methods of measurement specified in the present document or a documented alternative approved by the certifying authority; • equipment complies with ETSI EN 302 842-1 [1] and ETSI EN 302 842-2 [2]. NOTE: The present document has been produced with a view to maintaining consistency of numbering with the equivalent standard for ground equipment (ETSI EN 301 842 [i.7] parts 1 to 4). Where requirements are the same, they have been given the same number. Some new airborne requirements have been inserted between requirements that were sequential in ETSI EN 301 842 [i.7] parts 1 to 4. This has led to a non-standard form of numbering for new requirements in some places. SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)7 1 Scope The present document applies to the following radio equipment types: • Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air communications operating in the VHF band, using Gaussian Filtered Frequency Shift Keying (GFSK) modulation with 25 kHz channel spacing and capable of tuning to any of the 25 kHz channels from 112,000 MHz to 136,975 MHz as defined in ICAO VDL SARPs [i.2]. The present document provides part 3 of the technical specifications. The present document is designed to ensure that equipment certified to it will be compatible with the relevant ICAO VDL SARPs [i.2] and ICAO VDL4 Technical Manual [i.1]. Manufacturers should note that in future the tuning range for the transmitter and the receiver may also cover any 25 kHz channel from 108,000 MHz to 111,975 MHz. The present document applies to "aeronautical mobile (airborne and in some cases ground vehicles)" equipment which will hereinafter be referred to as "mobile" equipment.
The scope of the present document is limited to mobile stations. The equivalent specification for ground stations is ETSI EN 301 842 [i.7]. A description of the scope of the VDL Mode 4 system is provided in part 2 of these technical specifications (see ETSI EN 302 842-2 [2], clause 1). ETSI EN 302 842-1 [1] deals with tests of the physical layer. ETSI EN 302 842-2 [2] deals with tests of the link layer sufficient to support broadcast functionality including requirements and tests sufficient to recognize and respond to transmissions associated with point-to-point communication. The present document provides technical specifications for a VDL Mode 4 mobile transceiver supporting a full Automatic Dependent Surveillance-Broadcast (ADS-B) capability and, optionally, the additional functionality of either, or a combination of, the following services: • Traffic Information Service-Broadcast (TIS-B); • Flight Information Service-Broadcast (FIS-B); • GNSS Augmentation Service-Broadcast (GNS-B). The TIS-B, FIS-B, or GNS-B reception processing functionality in the airborne equipment is expected to be provided by a TIS-B, FIS-B or GNS-B processor, which could be contained within the VDL Mode 4 transceiver, but could also be housed in a separate physical unit. Therefore to support TIS-B, FIS-B or GNS-B message reception, the minimum functionality demanded of a basic VDL Mode 4 airborne transceiver unit (i.e. one that does not have a TIS-B, FIS-B or GNS-B processor housed within it) is to pass to the TIS-B, FIS-B or GNS-B processor, all TIS-B, FIS-B or GNS-B messages received.
As the measured values of equipment performance may be a function of the method of measurement, standard test conditions and methods of test are recommended in the present document. The present document is organized as follows: • clause 2 provides references to relevant documents; • clause 3 provides general definitions, abbreviations and symbols used; • clause 4 describes the VDL Mode 4 mobile station functionality to support ADS-B, TIS-B, FIS-B and GNS-B; • clause 5 provides performance specifications for the VDL Mode 4 mobile station supporting ADS-B, TIS-B, FIS-B and GNS-B Services; • clause 6 provides general design requirements; • clause 7 provides protocol tests which emphasis the ADS-B, TIS-B, FIS-B and GNS-B functions of the system; SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)8 • annex A provides a detailed cross-reference to the relevant requirements contained in ICAO VDL4 Technical Manual [i.1]; • annex B provides a Bibliography. Note that the system can support a very wide range of functions. It is not practical to provide specific tests for all aspects of functionality. The approach used is to provide detailed tests for the core functionality to support ADS-B, FIS-B, TIS-B and GNS-B focusing on the system requirements which, if wrongly implemented, could cause a deterioration in the service offered by other VDL Mode 4 stations. Mandating and Recommendation Phrases a) "Shall": - The use of the word "Shall" indicates a mandated criterion; i.e. compliance with the particular procedure or specification is mandatory and no alternative may be applied. b) "Should": - The use of the word "Should" (and phrases such as "It is recommended that.", etc.) indicates that though the procedure or criterion is regarded as the preferred option, alternative procedures, specifications or criteria may be applied, provided that the manufacturer, installer or tester can provide information or data to adequately support and justify the alternative. 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. [1] ETSI EN 302 842-1 (V1.3.1): "VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment; Part 1: Physical layer". [2] ETSI EN 302 842-2 (V1.4.1): "VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment; Part 2: General description and data link layer". [3] ETSI EN 302 842-4 (V1.3.1): "VHF air-ground and air-air Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for aeronautical mobile (airborne) equipment; Part 4: Point-to-point functions". [4] WMO Publication No. 306: "Manual on Codes Vol 1.1, Part A". 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)9 The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. [i.1] ICAO Doc 9816 (First Edition 2004): "Manual on VHF Digital Link (VDL) Mode 4 - Part 2: Detailed Technical Specifications". [i.2] ICAO Annex 10 to the Convention on International Civil Aviation: "Aeronautical Telecommunications, Volume III: Communication Systems, Part I: Digital Data Communication Systems, chapter 6", including Amendment 88 (applicable 14/11/13). [i.3] RTCA DO-242A: "Minimum Aviation System Performance Standards for Automatic Dependent Surveillance Broadcast (ADS-B)". [i.4] Amendments 76 and 77 to Volume I of Annex 10 to the Convention on International Civil Aviation, International Civil Aviation Organization: Appendix B-B2, 3.6 "Ground-based augmentation system (GBAS)". NOTE: http://www.icao.int. [i.5] EUROCAE ED-114A: "Minimum Operational Performance Specification for Global Navigation Satellite Ground Based Augmentation System Ground Equipment to Support Category I Operations". NOTE: http://www.eurocae.net. [i.6] EUROCAE ED-108A: "MOPS for VDL Mode 4 Aircraft Transceiver for ADS-B", July 2001. [i.7] ETSI EN 301 842 (all parts): "VHF air-ground Digital Link (VDL) Mode 4 radio equipment; Technical characteristics and methods of measurement for ground-based equipment". [i.8] CEC Mandate M/318: "Mandate to CEN/CENELEC/ETSI for standardisation in the field of air traffic management systems and Galileo local components". 3 Definitions and abbreviations 3.1 Definitions 3.1.1 Basic reference model definitions See ETSI EN 302 842-2 [2], clause 3.1.1. 3.1.2 Service conventions definitions See ETSI EN 302 842-2 [2], clause 3.1.2. 3.1.3 General definitions For the purposes of the present document, the terms and definitions given in ETSI EN 302 842-1 [1], clause 3.1.3, ETSI EN 302 842-2 [2], clause 3.1.3 and the following apply: Automatic Dependent Surveillance-Broadcast (ADS-B): surveillance application transmitting parameters, such as position, track, ground speed and time via a broadcast mode data link for use by any air and ground users requiring it NOTE: ADS-B is a surveillance service based on aircraft self-determination of position/velocity/time and automatic, periodic, broadcast of this information along with auxiliary data such as aircraft identity (ID), intent information and communications control parameters, etc. ADS-B is intended to support multiple high-level applications and associated services such as cockpit display of traffic information, traffic alert and collision avoidance functionality, enhanced traffic management in the air and on the ground, search and rescue support and others. Automatic Terminal Information Service (ATIS): report generated by a ground station that includes weather conditions, operating procedures, runways and approaches in use, and any other information that may affect the departure, runway and landing phase of flight SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)10 Flight Information Service-Broadcast (FIS-B): uplink broadcast application providing local airborne traffic with information GNSS augmentation Service-Broadcast (GNS-B): uplink broadcast application providing aircraft with GNSS augmentation and integrity data METeorological Aerodrome Report (METAR): report generated by a ground station that broadcasts meteorological conditions at aerodromes, officially recoded and communicated at regular intervals SIGnificant METeorological Information (SIGMET): report generated by a ground station that broadcasts information about weather phenomena that may have an impact on aircraft at subsonic, transonic and supersonic cruising levels including thunderstorms, cyclones, turbulence and icing SPECIal observations and reports (SPECI): report generated by a ground station that is issued when meteorological conditions change sufficiently to affect aviation operations NOTE: The SPECI report contains the same information as a METAR. Traffic Information Service-Broadcast (TIS-B): uplink surveillance service that derives traffic information from one or more ground surveillance sources and broadcasts that information to suitably equipped aircraft or surface vehicles Traffic Information Volume (TIV): volume of airspace for which surveillance information is provided for all targets NOTE: Inside the TIV, a pilot knows he can rely on the surveillance picture presented to him; outside the TIV, ADS-B reports may be received but TIS-B reports may not be available. 3.1.4 Definition of bit order In the tables included in the present document to illustrate the format of bursts, the following order is implied: a) bit order in each burst subfield are indicated by subscript numbers. Bit 1 indicates the least significant bit; and b) bits are transmitted octet by octet, starting with the first octet in each table, and within each octet the rightmost bit (as shown in the tables) is transmitted first. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ACAS Airborne Collision Avoidance System ADS Automatic Dependent Surveillance ADS-B Automatic Dependent Surveillance-Broadcast ATC Air Traffic Control ATIS Automatic Terminal Information Service ATM Air Traffic Management BND Big Negative Dither CCI Co-Channel Interference CDTI Cockpit Display of Traffic Information CPR Compact Position Reporting CRC Cyclic Redundancy Code CSA Call Segment Association CTRL ConTRoL dB deciBel DFPAP Delta Flight Path Alignment Point DLPDU Data Link Protocol Data Unit DLS Data Link Service DOS Directory Of Services DT Directed Timeout EGNOS European Geostationary Navigation Overlay Service EPU Estimated Position Uncertainty EUROCAE EURopean Organization for Civil Aviation Equipment FAS Final Approach Segment FIR Flight Information Region FIS Flight Information Service SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)11 FIS-B Flight Information Service-Broadcast FPAP Flight Path Alignment Point fpm feet per minute fps feet per second FTP Fictitious Threshold Point GBAS Ground-Based Augmentation System GCID GNS-B Continuity / Integrity Designator GFSK Gaussian Filtered Frequency Shift Keying GLONASS GLObal NAvigation Satellite System (Russian system) GNS-B GNSS augmentation Service-Broadcast GNSS Global Navigation Satellite System GPA Glide Path Angle GPS Global Positioning System GRAS Ground-based Regional Augmentation System GSC Global Signalling Channel hex hexadecimal IA International Alphabet IA-5 International Alphabet-5 ICAO International Civil Aviation Organization ID IDentity ILS Instrument Landing System INFO INFOrmation (DLPDU) IRVR Instrumented RVR LSB Least Significant Bit LTP Landing Threshold Point MASPS Minimum Aviation System Performance Standards MEDUP MEDiterranean Update Programme METAR METeorological Aerodrome Report MLS Microwave Landing System MOPS Minimum Operational Performance Specification ms milliseconds MSAS Multi-functional Satellite Augmentation System MSB Most Significant Bit NAC Network Access Credentials NDB Non-Directional Beacon NEAN North European ADS-B Network NES Network End System NIC Navigation Integrity Category NM Nautical Mile NTM NT1 Test Mode/Network Traffic Management
NUP NEAN Update Programme PCO Point of Control and Observation PRN Pseudo Random Noise RCM Remote Command Message RCN Runway Condition RF Radio Frequency RR Receiver Position Vector RVR Routing Verification Result SARPs Standards And Recommended Practices SBAS Space-Based Augmentation System SIGMET SIGnificant METeorological information SIL Surveillance Integrity Level SPECI SPECIal observations and reports SPI Special Position Indicator SST Sea Surface Temperature SVQ State Vector Quality TBD To Be Defined TCH Threshold Crossing Height TCP Trajectory Change Point TIS Traffic Information Service TIS-B Traffic Information Service-Broadcast TIV Traffic Information Volume SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)12 TSA Temporary Segregated Areas TV Transmission Volume TWR Tower UCTRL Unacknowledged ConTRoL data broadcast (DLPDU) UTC Universal Time Coordinated VDF VHF Direction Finding VDL VHF Digital Link VEPU Vertical Estimated Position Uncertainty VHF Very High Frequency VOR VHF Omnidirectional Radio VSS VDL Mode 4 Specific Services WAAS Wide Area Augmentation System WGS World Geodetic System NOTE: As in WGS-84: World Geodetic System 1984. WMO World Meteorological Organization XOR Exclusive OR 4 General description of VDL Mode 4 broadcast services 4.1 General A description of VDL Mode 4 is provided in clause 4.1 of ETSI EN 302 842-2 [2]. This clause provides a description of the assumptions made in the derivation of the requirements for the VDL Mode 4 mobile station. In most respects, the VDL Mode 4 mobile station follows the provisions of the ICAO standards material for VDL Mode 4. Within the ICAO standard, there are some requirements that apply explicitly only to ground stations. A number of other requirements will also not apply because of the assumed services provided by the mobile station. The assumed services provided by the mobile station and the impact on the requirements are summarized in the rest of clause 4. The scope of the present document is for a mobile station supporting broadcast applications. Hence the ability to support point-to-point communication is not included in the present document. Those requirements are presented in ETSI EN 302 842-4 [3]. Note that, although certain protocols will not be used by the mobile station, the ability to recognize the use by mobiles of these protocols and to respond in a consistent manner is a mobile station requirement and is included in the present document. 4.2 Automatic Dependent Surveillance-Broadcast (ADS-B) Automatic Dependent Surveillance-Broadcast (ADS-B) is a surveillance application in which aircraft, vehicles and ground stations broadcast their identity, position, velocity, time, intent and other information, enabling other aircraft, vehicles and ground stations to develop a surveillance picture. ADS-B relies on the regular and frequent transmission of position reports via a broadcast data link. The position reports are sent periodically by the aircraft with no intervention from the ground. Position reports may be received by any recipient in range of the transmitting aircraft. Recipients may be other aircraft, ground vehicles or fixed ground sites. ADS-B offers data delivery from aircraft-to-aircraft or from aircraft-to-ground. Transmitting data directly from air-to-air means that there is no need for a ground infrastructure to be present for airborne surveillance to be performed. By using position reports received from surrounding aircraft, a traffic surveillance picture can be generated in the cockpits of all of the aircraft. This potentially allows new applications or new manoeuvres to be performed by pilots. The transmitting aircraft does not know which, if any, recipients are receiving and processing the position reports. Unlike a point-to-point link, position reports are not acknowledged. The concept with ADS-B is that position reports are transmitted so frequently that the loss of a small number of position reports is not operationally significant. SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)13 ADS-B messages are broadcast and received by appropriately equipped participant subsystems. ADS-B subsystems include aircraft, vehicles and ground subsystems. The capabilities of participant subsystems will vary based upon class of equipage. The ADS-B aircraft subsystem interacts with other onboard systems such as pilot display equipment and the aircraft navigation system. The ADS-B ground subsystem interacts with other ground systems such as ATM applications and controller display processing equipment. If received by a data acquisition unit, the position report will be processed with other surveillance data and may be forwarded to a controller/pilot display. Airborne VDL Mode 4 stations supporting full ADS-B capability: • Receive and process the ADS-B reports from other aircraft, vehicles and ground stations, passing the received data to a surveillance server. • Transmit ADS-B reports at the required regular intervals (or more frequently) and including required and possibly some optional information. Figure 4.1 illustrates the context for the airborne station supporting ADS-B functions.
VDL Mode 4 Airborne Station Surveillance and Display Server with full ADS-B Aircraft Other VDL Mode 4 Stations Broadcast Broadcast
Figure 4.1: Airborne station supporting ADS-B functions A VDL Mode 4 airborne station supporting ADS-B receives broadcast ADS-B reports and passes on the data to a surveillance processor. A VDL Mode 4 airborne station supporting ADS-B may also receive data for transmission and instructions for transmission rates from the surveillance processor.
The requirements for ADS-B are taken from the ICAO VDL 4 Technical Manual [i.1]. 4.3 Traffic Information Service-Broadcast (TIS-B) Traffic Information Service-Broadcast (TIS-B) is a surveillance service that derives traffic information from one or more ground surveillance sources and broadcasts that information to suitably equipped aircraft or surface vehicles. The purpose of TIS-B is to complement the surveillance information provided from ADS-B aircraft to ensure that a full surveillance picture is available to airborne systems. The TIS-B service is provided within an area known as the Traffic Information Volume (TIV), which is the volume of airspace for which surveillance information is provided for all targets. Inside the TIV, a pilot knows he can rely on the surveillance picture presented to him; outside the TIV, ADS-B reports may be received but TIS-B reports may not be available. A TIS-B service either provides a "full surveillance picture" or a "gap filler service". For the full surveillance picture, information is provided on all targets. The "gap filler service" information is only provided for targets which do not support ADS-B via VDL Mode 4. A VDL Mode 4 airborne station supporting TIS-B receives two main sorts of message: a) Management Messages: which contain information about the TIS-B service and the TIV. SIST EN 302 842-3 V1.4.1:2015

ETSI ETSI EN 302 842-3 V1.4.1 (2015-04)14 b) Target Messages: which contain information about aircraft or ground vehicle targets. Figure 4.2 illustrates the context for the airborne station supporting TIS-B.
VDL Mode 4 Airborne Station Surveillance and Display Server including TIS-B Aircraft Other VDL Mode 4 Stations Broadcast TIS-B Broadcast
Figure 4.2: Airborne station supporting TIS-B functions A VDL Mode 4 airborne station supporting TIS-B receives broadcast TIS-B reports and passes on the data to a surveillance processor that includes TIS-B processing capability. The present document therefore includes requirements that apply to the part of the airborne equipment involved in TIS-B data processing, but this is not necessarily contained within the VDL Mode 4 airborne station.
The requirements for TIS-B are taken from the TIS-B Service Description produced by the Mediterranean UpDate and Nean Update programmes (MEDUP and NUP). Eurocontrol TIS-B Requirements have been taken into account in the development of the present requirements. 4.4 Flight Information Service-Broadcast (FIS-B) Flight Information Service-Broadcast (FIS-B) is an uplink broadcast application providing local traffic with information. The following message types are supported: a) METeorological Aerodrome Report (METAR): report indicating meteorological conditions at aerodromes, officially recoded and communicated at regular intervals. Intermediate observations are also recorded and communicated when meteorological conditions change sufficiently to affect aviation operations (see SPECI). b) Automatic Terminal Information Service (ATIS): report indicating weather conditions, operating procedures, runways and approaches in use, and any other information that may affect the departure, runway and landing phase of flight. c) Runway Condition (RCN): report including information about the current runway visual range conditions and any other runway condition that may affect the departure, runway and landing phases of flight. d) SIGnificant METeorological information (SIGMET): report broadcasting information about weather phenomena which may have an impact on aircraft at subsonic, transonic and supersonic cruising levels including thunderstorms, cyclones, turbulence and icing. e) SPECIal observations and reports (SPECI): report generated when meteorological conditions change sufficiently to affect aviation operations. The SPECI report contains the same information as a METAR. f) Report Request: the FIS-B report request enables an aircraft to request specific FIS data. The FIS-B service is provided within a Transmission Volume (TV) which is defined as the area in which the FIS-B information ap
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