IEC 61993-2:2012

Maritime navigation and radiocommunication equipment and systems - Automatic identification systems (AIS) - Part 2: Class A shipborne equipment of the automatic identification system (AIS) - Operational and performance requirements, methods of test and required test results

IEC 61993-2:2012(E) specifies the minimum operational and performance requirements, methods of testing and required test results conforming to performance standards adopted by the IMO in Resolution MSC.74(69), Annex 3, Shipborne Automatic Identification System. This standard incorporates the applicable technical characteristics of Class A shipborne equipment included in Recommendation ITU-R M.1371-4 and takes into account the ITU Radio Regulations, where applicable. In addition, it takes account of IMO Resolution A.694(17) to which IEC 60945 is associated. When a requirement in this standard is different from IEC 60945, the requirement of this standard takes precedence. This International Standard also specifies the minimum requirements both for the means to input and display data and for the interfaces to other equipment suitable to be used as means of input and display data. This second edition cancels and replaces the first edition, published in 2001. This edition constitutes a technical revision.

General Information

• Status: Published
• Publication Date: 18-Oct-2012
• ICS: 33.120.10 - Coaxial cables. Waveguides
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: TC 80 - Maritime navigation and radiocommunication equipment and systems
• Drafting Committee: WG 15 - TC 80/WG 15
• Current Stage: DELPUB - Deleted Publication
• Start Date: 19-Jul-2018
• Completion Date: 26-Oct-2025

Relations

• Revised: IEC 61993-2:2018 - Maritime navigation and radiocommunication equipment and systems - Automatic identification systems (AIS) - Part 2: Class A shipborne equipment of the automatic identification system (AIS) - Operational and performance requirements, methods of test and required test results
• Effective Date: 05-Sep-2023
• Revises: IEC 61993-2:2001 - Maritime navigation and radiocommunication equipment and systems - Automatic identification systems (AIS) - Part 2: Class A shipborne equipment of the universal automatic identification system (AIS) - Operational and performance requirements, methods of test and required test results
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61993-2 ®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
Maritime navigation and radiocommunication equipment and systems –
Automatic identification systems (AIS)
Part 2: Class A shipborne equipment of the automatic identification system (AIS) –
Operational and performance requirements, methods of test and required test
results
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IEC 61993-2 ®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
Maritime navigation and radiocommunication equipment and systems –

Automatic identification systems (AIS)

Part 2: Class A shipborne equipment of the automatic identification system (AIS) –

Operational and performance requirements, methods of test and required test

results
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XF
ICS 47.020.70 ISBN 978-2-83220-416-0

– 2 – 61993-2 © IEC:2012(E)
CONTENTS
FOREWORD . 9

INTRODUCTION . 11

1 Scope . 12

2 Normative references . 12

3 Abbreviations . 13

4 General requirements . 14

4.1 General . 14

4.1.1 Overview . 14
4.1.2 General requirements . 14
4.1.3 Capabilities of the AIS . 15
4.1.4 Additional requirements . 15
4.1.5 Transmitter shutdown procedure. 15
4.1.6 Quality assurance . 15
4.2 Modes of operation . 15
4.3 Manuals . 15
4.4 Marking and identification . 16
5 Other requirements. 16
5.1 Environmental, power supply, special purpose and safety requirements . 16
5.2 Display of information . 16
6 Performance requirements . 16
6.1 Composition . 16
6.2 Time and position . 17
6.2.1 Source for UTC . 17
6.2.2 Source for AIS position reporting . 17
6.3 User interface . 17
6.4 Identification. 18
6.5 Information . 18
6.5.1 Information provided by the AIS . 18
6.5.2 Information reporting intervals . 19
6.5.3 Ship reporting capacity . 19
6.6 Event log . 20
6.7 Permissible initialization period . 20

6.8 Power supply . 20
6.9 Technical characteristics . 20
6.10 Alarms and indications, fall-back arrangements . 20
6.10.1 Built-in test equipment . 20
6.10.2 Alarm messages . 21
6.10.3 Status messages . 23
6.11 Display, input and output . 26
6.11.1 Minimum keyboard and display (MKD) . 26
6.11.2 Communication test . 28
6.11.3 Alarms and status information . 29
6.11.4 Data protection . 29
6.11.5 Distance calculation . 29
6.12 Protection from invalid controls . 30
7 Technical requirements . 30

61993-2 © IEC:2012(E) – 3 –
7.1 General . 30

7.2 Physical layer . 30

7.2.1 General . 31

7.2.2 Transmitter parameters . 31

7.2.3 Receiver parameters . 32

7.3 Link layer . 32

7.3.1 General . 32

7.3.2 Link sublayer 1: Medium Access Control (MAC) . 33

7.3.3 Link sublayer 2: Data Link Service (DLS) . 33

7.3.4 Link sublayer 3 – Link Management Entity (LME) . 33

7.4 Network layer . 35
7.4.1 General . 35
7.4.2 Management of regional operating settings . 35
7.5 Transport layer . 37
7.6 Presentation interface . 37
7.6.1 General . 37
7.6.2 Automatic input of sensor data . 38
7.6.3 High speed input/output ports . 38
7.6.4 Long-range communication ports . 41
7.6.5 BIIT alarm output . 43
8 Long-range applications . 43
8.1 General . 43
8.2 Long-range application by two-way interface . 43
8.2.1 General . 43
8.2.2 Interrogations and responses . 44
8.2.3 Manual and automatic response . 44
8.2.4 Data formats and contents . 44
8.2.5 Addressing AIS-units . 44
8.3 Long-range application by broadcast . 45
9 Test conditions . 45
9.1 Normal and extreme test conditions. 45
9.1.1 Normal test conditions . 45
9.1.2 Extreme test conditions . 45
9.2 Standard test environment. 46
9.3 Additional test arrangements . 46

9.3.1 Arrangements for test signals applied to the receiver input . 46
9.3.2 Encoder for receiver measurements . 46
9.3.3 Waiver for receivers . 46
9.3.4 Impedance. 47
9.3.5 Artificial antenna (dummy load) . 47
9.3.6 Facilities for access . 47
9.3.7 Modes of operation of the transmitter . 47
9.4 Common test conditions for protection from invalid controls . 47
9.5 Measurement uncertainties . 47
10 Test signals . 48
10.1 Standard test signal number 1 (DSC) . 48
10.2 Standard test signal number 2 (TDMA) . 48
10.3 Standard test signal number 3 (TDMA) . 48
10.4 Standard test signal number 4 (PRBS) . 48

– 4 – 61993-2 © IEC:2012(E)
10.5 Standard test signal number 5 (PRBS) . 48

11 Power supply, special purpose and safety tests . 49

12 Environmental tests . 49

13 EMC tests. 50

14 Operational tests . 50

14.1 Identification and operating modes . 50

14.1.1 Autonomous mode . 50

14.1.2 Assigned mode . 51

14.1.3 Polled mode . 51

14.1.4 Addressed operation. 52
14.1.5 Broadcast operation . 52
14.1.6 Multiple slot messages . 53
14.2 Information . 53
14.2.1 Information provided by the AIS . 54
14.2.2 Reporting intervals . 54
14.3 Event log . 55
14.3.1 Method of measurement . 56
14.3.2 Required results . 56
14.4 Initialization period . 56
14.4.1 Method of measurement . 56
14.4.2 Required results . 56
14.5 Technical characteristics . 56
14.5.1 Channel selection . 56
14.5.2 Transceiver protection . 57
14.5.3 Automatic power setting . 57
14.6 Alarms and indicators, fall-back arrangements . 57
14.6.1 Loss of power supply . 57
14.6.2 Monitoring of functions and integrity . 57
14.6.3 Monitoring of sensor data . 59
14.7 Display, input and output . 62
14.7.1 Data input/output facilities . 62
14.7.2 Initiate message transmission . 62
14.7.3 Communication test . 63
14.7.4 System control. 63
14.7.5 Display of received targets . 64
14.7.6 Display of position quality . 65
14.7.7 Display of targets if optional filter is implemented . 65
14.7.8 Display of received safety related messages . 66
14.7.9 Presentation of navigation information . 66
15 Physical tests . 66
15.1 TDMA transmitter . 67
15.1.1 Frequency error . 67
15.1.2 Carrier power . 67
15.1.3 Slotted transmission spectrum . 68
15.1.4 Modulation accuracy . 69
15.1.5 Transmitter output power characteristics . 69
15.2 TDMA receivers . 70
15.2.1 Sensitivity . 70

61993-2 © IEC:2012(E) – 5 –
15.2.2 Error behaviour at high input levels . 71

15.2.3 Co-channel rejection . 71

15.2.4 Adjacent channel selectivity . 72

15.2.5 Spurious response rejection . 72

15.2.6 Intermodulation response rejection and blocking . 75

15.2.7 Transmit to receive switching time . 76

15.2.8 Immunity to out-of-band energy . 77

15.3 Conducted spurious emissions . 77

15.3.1 Spurious emissions from the transmitter . 77

15.3.2 Spurious emissions from the receiver . 78

16 Specific tests of link layer . 78
16.1 TDMA synchronisation. 78
16.1.1 Synchronisation test using UTC . 78
16.1.2 Synchronisation test using UTC with repeated messages . 79
16.1.3 Synchronisation test without UTC, semaphore . 79
16.1.4 Synchronisation test without UTC . 80
16.1.5 Reception of un-synchronised messages . 80
16.2 Time division (frame format) . 80
16.2.1 Method of measurement . 80
16.2.2 Required results . 80
16.3 Synchronisation and jitter accuracy . 81
16.3.1 Definition . 81
16.3.2 Method of measurement . 81
16.3.3 Required results . 81
16.4 Data encoding (bit stuffing) . 81
16.4.1 Method of measurement . 81
16.4.2 Required results . 81
16.5 Frame check sequence . 81
16.5.1 Method of measurement . 81
16.5.2 Required results . 81
16.6 Slot allocation (channel access protocols) . 82
16.6.1 Network entry . 82
16.6.2 Autonomous scheduled transmissions (SOTDMA) . 82
16.6.3 Autonomous scheduled transmissions (ITDMA) . 82
16.6.4 Safety related/binary message transmission . 83

16.6.5 Transmission of Message 5 (ITDMA) . 83
16.6.6 Assigned operation . 83
16.6.7 Group assignment . 84
16.6.8 Fixed allocated transmissions (FATDMA) . 88
16.6.9 Randomisation of message transmissions . 88
16.7 Message formats . 88
16.7.1 Received messages . 88
16.7.2 Transmitted messages. 89
17 Specific tests of network layer . 89
17.1 Dual channel operation – Alternate transmissions . 89
17.1.1 Method of measurement . 89
17.1.2 Required results . 89
17.2 Regional area designation by VDL message . 89
17.2.1 Method of measurement . 89

– 6 – 61993-2 © IEC:2012(E)
17.2.2 Required results . 90

17.3 Regional area designation by serial message . 90

17.4 Regional area designation with lost position . 91

17.4.1 Method of measurement . 91

17.4.2 Required results . 91

17.5 Power setting . 91

17.5.1 Method of measurement . 91

17.5.2 Required results . 91

17.6 Message priority handling . 91

17.6.1 Method of measurement . 91

17.6.2 Required results . 91
17.7 Slot reuse and FATDMA reservations . 91
17.7.1 Method of measurement . 91
17.7.2 Required results . 92
17.8 Management of received regional operating settings . 92
17.8.1 Test for replacement or erasure of dated or remote regional
operating settings . 92
17.8.2 Test of correct input via presentation interface or MKD . 93
17.8.3 Test of addressed telecommand . 94
17.8.4 Test for invalid regional operating areas . 94
17.9 Continuation of autonomous mode reporting interval . 95
17.9.1 Method of test . 95
17.9.2 Required results . 95
18 Specific tests of transport layer . 95
18.1 Addressed messages . 95
18.1.1 Transmission . 95
18.1.2 Acknowledgement . 95
18.1.3 Transmission retry . 95
18.1.4 Acknowledgement of addressed safety related messages . 96
18.1.5 Behaviour of NavStatus 14 reception . 96
18.2 Interrogation responses . 96
18.2.1 Method of measurement . 96
18.2.2 Required results . 96
19 Specific presentation interface tests . 97
19.1 General . 97

19.2 Checking manufacturer's documentation . 97
19.3 Electrical test . 97
19.3.1 Method of test . 97
19.3.2 Required results . 97
19.4 Test of input sensor interface performance . 97
19.4.1 Method of measurement . 97
19.4.2 Required results . 98
19.5 Test of sensor input . 98
19.5.1 Test of GNS input . 98
19.5.2 Test of RMC input. 98
19.5.3 Test of DTM input . 99
19.5.4 Test of GBS input . 99
19.5.5 Test of VBW input. 100
19.5.6 Test of VTG input . 100

61993-2 © IEC:2012(E) – 7 –
19.5.7 Test of HDT/THS input . 101

19.5.8 Test of ROT input . 101

19.5.9 Test of different inputs . 102

19.5.10 Test of multiple inputs . 102

19.6 Test of high speed output . 103

19.6.1 Method of measurement . 103

19.6.2 Required results . 103

19.7 High speed output interface performance . 103

19.7.1 Method of measurement . 103

19.7.2 Required results . 103

19.8 Output of undefined VDL messages . 103
19.8.1 Method of measurement . 103
19.8.2 Required results . 103
19.9 Test of high speed input . 103
19.9.1 Method of measurement . 103
19.9.2 Required results . 104
20 Long-range functionality tests . 104
20.1 Long-range application by two-way interface . 104
20.1.1 LR interrogation . 104
20.1.2 LR "all ships" interrogation . 104
20.1.3 Consecutive LR “all ships” interrogations . 105
20.2 Long-range application by broadcast . 105
20.2.1 Long-range broadcast . 105
20.2.2 Multiple assignment operation . 106
Annex A (informative) Block diagram of AIS . 108
Annex B (normative) AIS interface overview (see Table 13) . 109
Annex C (informative) Block diagram of standard test environment . 110
Annex D (normative) DSC functionality . 111
Annex E (informative) Optional PI port sentences . 117
Annex F (informative) Alarm handling . 121
Annex G (normative) Calculation of area size and distance . 122
Annex H (normative) Transmission of binary Messages 25 and 26 . 125
Bibliography . 129

Figure 1 – OSI layer model . 30
Figure 2 – Power versus time characteristics . 31
Figure 3 – Format for repeating four-packet cluster . 48
Figure 4 – Measurement arrangement for frequency error . 67
Figure 5 – Measurement arrangement for carrier power . 67
Figure 6 – Emission mask for slotted transmission . 68
Figure 7 – Measurement arrangement for modulation accuracy . 69
Figure 8 – Measurement arrangement . 70
Figure 9 – Measurement arrangement with two generators . 71
Figure 10 – SINAD or PER/BER measuring equipment . 74
Figure 11 – Test set-up . 75
Figure 12 – Transmit to receive switching time measurement setup . 76

– 8 – 61993-2 © IEC:2012(E)
Figure 13 – Regional area scenario . 90

Figure D.1 – Measurement arrangement for inter-modulation . 114

Table 1 – Information reporting intervals for autonomous mode . 19

Table 2 – Integrity alarm conditions signalled using ALR sentence formatter . 22

Table 3 – Sensor status indications signalled using TXT sentence formatter . 23

Table 4 – Position sensor fallback conditions . 24

Table 5 – Use of accuracy (PA) flag . 25

Table 6 – ROT sensor fallback conditions . 26
Table 7 – Message display on MKD . 27
Table 8 – Position quality . 28
Table 9 – Transmitter parameters . 31
Table 10 – Power versus time characteristics . 32
Table 11 – Receiver parameters . 32
Table 12 – Use of VDL messages . 33
Table 13 – Presentation interface access . 37
Table 14 – IEC 61162-1 sensor sentences . 38
Table 15 – AIS High-speed input data and formats . 39
Table 16 – AIS high-speed output data and formats . 40
Table 17 – AIS Long-range communications input data and formats . 42
Table 18 – LR output data formats . 43
Table 19 – LR data types . 44
Table 20 – Content of first two packets . 49
Table 21 – Fixed PRS data derived from Recommendation ITU-T O.153. 49
Table 22 – Peak frequency deviation versus time . 69
Table 23 – Tests to be performed . 76
Table 24 – Primary channels for each region . 90
Table E.1 – Property identifier . 118
Table G.1 – Coordinate points . 122

61993-2 © IEC:2012(E) – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
MARITIME NAVIGATION AND
RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS –

AUTOMATIC IDENTIFICATION SYSTEMS (AIS)

Part 2: Class A shipborne equipment of the automatic identification

system (AIS) – Operational and performance requirements, methods of

test and required test results

FOREWORD
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International Standard IEC 61993-2 has been prepared by IEC technical committee 80:
Maritime navigation and radiocommunication equipment and systems.
This second edition cancels and replaces the first edition, published in 2001. This edition
constitutes a technical revision.
This edition includes the following technical changes with respect to the previous edition:
It incorporates the technical characteristics included in Recommendation ITU-R M.1371-4
which was published in 2010. New technical characteristics result in sundry clarifications to
the requirements and the ability to handle five new messages – Messages 23, 24, 25, 26
and 27.
...