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1. 1 2 3 4
2. 13 2100Hz 27MHz 2100Hz 14
3. 21 4 1 ASA 2 FAX
4. 3 95 5 27MHz
5. 15 16 1 4 24 103
6. 2 30 4 5 1200bps 1 0 1000Hz 60
7. 24 2 5 1 10 000 10 000 30 000 30 000 50 000 50 000 HI N 10 6 25 8 33 3 p 10000F 300nn 50nnn 0500009 ENA 50 000 10 000 30 000 50 000 NA 18 22 17 2 7 66 4
8. 23 24 6 6 1 6 1 1 1 27MHz 26760kHz 26776kHz 8kHz 8 26824kHz 26832kHz 26880kHz 8kHz 7 2688kHz 26896kHz 26912kHz 26936kHz 86kHz 4 26944kHz 27524kHz 27532kHz 27556kHz 8kHz 4 27572kHz 27580kHz 8kHz 2 27628kHz 27636kHz 27668kHz 6kHz 5 27676kHz 27724kHz 27732kHz 27772kHz 8kHz 6 27780kHz 27916kHz 27940kHz 27964kHz 27828kHz 27836kHz 27852kHz 27908kHz 27932kHz 27956kHz 27980kHz 27988kHz 27860kHz 27884kHz 27892kHz 27988kHz 54 40MHz 39 08MHz 39 616MHz 8kHz 61 39 688MHz 39 928MHz 8kHz 26 150M
9. 27MHz PC 19 9 28 94 2 1
10. 21 3 14 2 T 6 1 2 6 1 2 1 1 27MHz 50Hz 40MHz 20 x 10 LAA 150MHz 10x 10 2 6kHz 3 27MHz 1W 40MHz 1W 150MHz 1W 4 20 50 o 5
11. 1 1 7 0 7 1 2 2 HK 2 123456 2 7 1 80 2123456 0 3 1 1 NG 10 FK 30 FO 60 NN 11 SG 31 OT 61 TG 12 KT 32 KM 62 GM 13 HG 33 MZ 63 1G 14 0S 34 KG 64 CB 15 NR 35 SA 65 ST 16 WK 36 NS 66 TK 17 SN 40 AM 70 YN 18 TT 41 AT 71 KN 19 OY 42 IT 72 IK 20 HS 43 YM
12. 1200bps 1 0 1000Hz 60 10dB 0 5 27MHz 40MHz 9kHz 1GHz 150MHz 9kHz 10 1200bps 1 0 1000Hz 60
13. 4 3 1
14. 1 2 2 20 3 4
15. 5 Annex 3 4 6 Annex 3 5 7 0 Y Annex 3 6 ITU T E 161 1S03791 8 Annex 4 2 38 9 55V lk 7 4 10 11
16. 165 IPR GP amp C System International AIS SOTDMA SOLAS AIS 5 ITU R ITU R Ik International Telecommunication Union Radiocommunications Sector MMS MMSI Maritime Mobile Service Identity 3 6 MSC MSC Maritime Safety Committee IMO COMSAR NAV S0LAS
17. 2 18 0 59 F 12 5kHz 62 5kHz 62 5kHz 9kHz
18. 1 7 IEC61162 9 21 3 14 2 3 2 1 AIS 14 AIS 1 No 1 2 3 4 5 8 12 14 15 18 20 21 22 23 24
19. 3 AlS AIS 4 5 AIS AIS 4 1 3 AIS 1 AIS 2000 12 SOLAS 2002 7 1 300 500 AIS AIS
20. 400m 27MHz 27MHz 3 O 7 8 O 150m 4
21. ja MA fia i az 2 4 2 22 5 on on on 1 Lian lg i dn et a Nd ao eek an a 2 1 2 1
22. 150MHz HO 2 AIS AIS AIS AIS AIS B CSTDMA AIS CSAIS SOTDMA AIS SOAIS 2 AIS CSAIS SOAIS 4 AIS AIS
23. 15 17 16 4 2 2
24. 101dBm 31dBm PER 20 101dBm 31dBm PER 209 DA 101dBm 2 PER 2096 1 50kHz 36dBm 2 100kHz 36dBm 101dBm PER 209
25. 12 IMO A 694 17 Annex 7 1 Annex 7 2 Annex 8 1 Annex 8 2 1 7 4 D 7 2 RE OWBIL REEMA RCRA 1 2 IMO A 694 17 Annex 8 3 Annex 9 IEC60945 Ed4 11 2 2 39 2 1
26. 150MHz 10kHz 5kHz 4 40MHz 50 dB 40MHz 40 dB 70 1 3 3 ae 1 40MHz 50dB 40dB 5 70 3dB 400Hz 60 8kHz 999 6 S N 50dB 1000Hz 30 3dB 400Hz 60 8kHz SINAD 12dB S N
27. G 22 He HH RSE 34 2 MM Sy KET SAE 4 1 2 OX
28. 2 1 1 19 10 25 AIS 2 2 19 12 14 AIS Class B 3 3 19 1 29 AIS 13 1 4 4 20 2 13 AIS 5 5 20 3 5
29. 2 11 MKD 2 1 AlS 12 3 AIS AIS ITU R NM 1371 3 IEC62287 1 3 1 1 18 2 25kHz 3 9600 4 CSTDMA Carrier Sense Time Division Multiple Access 5 GMSK Gaussian Minimum Sift Keying 6 0 5 NRZI Non Return to Zero Inverted 4 7 8 AIS CSAIS AIS
30. 10dB 6 1 4 2 1 3 2 70 3 70 4 3SG1 SG2
31. ON OFF 2 AIS 3 4
32. 4 15 3C 10 1 2 3 5 40 3 C 93 3 10 6 30Hz 1 2 3 2 IEC60945 Ed3 46 3 1 10 2 7 1 12 1234567 0
33. msg msg Ik message DRS NAV NAV amp Sub Committee on Safety of Navigation OK MSC NP NP New work item proposal Do TC TC lk Technical Committee DK IEC 58 2 AIS 1 AIS
34. DX DX DX DX DX DX DX Al A2 RX RX RX RX RX RX RX RX RX 7 6 5 4 3 2 1 0 P1 P2 P3 P4 P5 L1 L2 L3 L4 Al A2 P1 P2 P3 P4 P5 LI L2 1 L5 L6 L7 L8 L9 V1 V2 D1 D2 L3 L4 L5 L6 L7 L8 L9 V1 V2 S EOS ECC EOS EOS D1 D2 S EOS ECC DX DX 125 V1 V2 RXO RX7 RX D1 D2 RX0 104 RX7 111 S Al A2 ECC ECC 50 P1 lt P5 EOS 127 LI L 1 3 3 1 1 0 lt 9999 2 Al 2 A2 2 0199 Al 01 A2 99 4 2 1 0199 2 0299 3 0399 5 1 0 9999999999 2 P1 2 Ht P2 P3 2 P4 P5 2
35. 33dBm 3dBm Annex2 2 13 2 IMO MSC74 69 Annex3 7 IEC 62287 1 11 1 2 3 IU R M 1371 25kHz Annex2 2 4 2 IEC 62287 1 dBc 0 11 1 3 3 10 20 0 59 je EE 70 80 62 5 0 62 5 Fc IEC 267 06 4 4 1 12 5kHz 1 2 5W ITU R ML329 8 62 5kHz 2
36. 2 2 1 1 0 200 2 2 1 DX RX 2 Dx RSD nxt PIM 4 1 49 2 DX 6 RX 8 DX 125 RX RX7 RX0 111 104 3 DX RX 4 EOS 127 DX EOS ECC EOS EOS 4 RX EO0S ECC 2 EOS 127
37. No 13 18 19 24 7 6 1 A 2 30 B 2 3 C I TREN Se 0 default Tx 1 Tx 2 Rx 1 Rx 2 Tx 1 Rx 1 Rx 2 2 Tx 2 Rx 1 Rx 2 DSC TDMA DSC TDMA DSC DSC 2 TDMA 161 500MHz 162 025MHz 25kHz
38. 1 1 o 12 o T 2 7 1 3 A ECC 4 A 26
39. 27MHz 1 1 1 9 2 343m 96 E 1 dB u V m 5 10 33 10 38 10 43 11 07 13 16 13 24 13 37 1 10 1 10 5 p 7 2a EX 6 5 ia 5 a HX EP Mn 4 it MEJ 3 ii 2 iR 2 Ho 1 0 1 10 0 10 20 30 40 50 dB V m 2
40. 1 IEC 62287 1 6 6 1 1 6 7 1 2 3 2 IEC 62287 1 9 1 3 msg18 ITU R M 1371 3 msg24 Annex7 IEC 62287 1 6 5 1 10 2 1 1 4 1 msg18 1 msg18 10 ITU R M 1371 2 msg24 6 3 3 4 4 2 msg24 3 1 3 MSG24 DF IEC 62287 1 6 6 5 2 3
41. SG2 SG1 ZR 3dB SG2 8kHz 150MHz 20kHz 99 31 6 2 6 2 1 1 6 1 12 8 9 0 3 2 3 4 5 6 2 2 6 2 2 1 1 27MHz 20Hz
42. 3kHz RF 31dBm 5 PER 20 IEC 62287 1 RF 101dBm 11 2 5 400Hz 3kHz RF 31dBm 44 ER 6 PER 20 IEC 62287 1 RF 101dBm 11 2 6 ZR 36dB 1 50kHz m 400Hz 2 100kHz 4 3kHz en 7
43. GMSK 0 4 15 5 2W 20 2 Afc lt 10kHz 25dBW 25kHz Afc lt 62 5kHz 60dBW F 12 5kHz 62 5kHz 2 5W 62 5kHz 2 5W F T
44. IEC AIS 2001 IEC61993 2 CSAIS 2006 3 AY ITU R M 1371 2 IEC62287 1 Ed 1 TC80 IEC62287 1 Ed 2 2008 AISWG 2007 8 Ed 2 CDV CDV 2 1 2 SOAIS SOAIS CSAIS SOTDMA GP amp C System International IPR AIS AIS B CSAIS SOAIS AIS AIS AIS AtoN AIS AIS Repeater Station AIS Limited Base Sations IMO SC 2007 10 83
45. 2006 10 47 CFR Part 80 Subchapter D Safety and Special Radio Services CSAIS FCC 2 1 ITU R ITU R SG1 SDectrum management SG3 Radiowave propagation SG4 Satellite services SG5 Terrestrial Services WP5A Land mobile service excluding IMT amateur and amateur satellite service WP5B Maritime mobile service including Global Maritime Distress and Safety System GMDSS aeronautical mobile service and radiodetermination service WP5C Fixed wireless systems HF systems in the Fixed and Land Mobile Services WP5D IMT Systems SG6 Broadcasting service SG7 Science services X 2008 3 CSAIS 2 2 AlS IMO ITU R IEC 1998 05 MSC 74 69 AIS 1998 11 M 1371 AIS 2000 05 MSC 73 SOLAS V 2001 08 M 1371 1 AIS 2001 12 IEC61993 2 Ed 1 AIS 2006 03 M 1371 2 AIS B 2006 03
46. 0dBV m 6 1 Ek 2 1 109 CH FEER 11 lt 17 76 105 3dBw V m LECH 1dBV m 1dBV m 1dBV m
47. WER AIS 20 3 14 1 AIS ooa 1 1 1 2 1 3 AIS 2 AIS 2 1 gt r 2 1 1 CSAIS 1 2 SOAIS 1 3 CSAIS AIS 2 1 2 2 sonona a 2 3 ttt tee ee 2 4 ai 2 2 5 AIS 3 AIS
48. 13 No Yes 14 is Opt TE CSAIS msg18 msg24 RN msg19 16 No No 17 iia Opt No gt 36 No 2 CSAIS 143 18 Class B Yes Yes q CS 19 Class B Opt Yes en d I i er lie No gt 21 Yes No 22 Yes No 23 Yes No 24 CSAIS Yes Yes A B 2 25 63 No No 1
49. 7 3 1 1 2 1 2 3 4 18 19 Yes IEC62287 1 Opt 37 AIS KS 2 1 BR amp 1 1 2 IEC80 426 FDIS 1 IEC62287 1 7 TDMA 6 1 4 TDMA2 CH70 DSC I GNSS t 2 IMO A 694 17 Annex 3 1 3 Annex 3 2 4 Annex 3 3
50. AIS B AIS AIS B AIS AIS om z a 45 E O AIS A VHF 161 975MHz 162 025MHz mamas 1 1 AIS 1 2 AIS lze 1 AIS 2 AIS
51. 2 1 AIS IEC Simplex AISWG 2008 8 AO Scotland Edinburgh CDV Repeater Station Inland AIS 4 Limited Base Station IEC62320 4 Ed 1 IALA Recommendation A 124 IEC Repeater Station Limited Base Station 60 HHHHHHH Rec ITU R M 1371 3 71 Annex 7 Class B AIS using CSTDMA technology 1 Definition This Annex describes a Class B AIS using carrier sense TDMA CSTDMA technology subsequently referred to as Class B CS The CSTDMA technology requires that the Class B CS unit listens to the AIS network to determine if the network is free of activity and transmits only when the network is free The Class B CS unit is also required to listen for reservation me
52. AIS AIS SART 2008 2 1 2 2 6 2 1 3 CSAIS EU AIS B CS 1949 EC R amp TTE OFCOM Interface Requirement AIS CSAIS UK Interface Requirment2033 E Industry Canada Radio Standards Specification CSAIS AIS RSS 182 Maritime Radio Transmitters and Receivers in the Band 156 162 5MHz VHF 1 FCC CSAIS
53. 59 3 AIS 1 AIS IEC62320 1 Ed 1 IEC62320 1 Ed 1 2007 2 AIS Class A CSAIS PI 18 BSH Bundesamt fur Seeschifffart und Hydrographie AISWG IEC62320 100 PAS 2 AIS AtoN Aids to Navigation Station IEC62320 2 Ed 2 2007 8 AISMG1 AIS Aton FDIS Final Document for International Standard TC80 3 AIS Repeater Station IEC62320 3 Ed 1 IEC Non ship AIS Repeater Station IALA Recommendation A 124 Repeater Station Simplex Duplex 2 Duplex
54. MMSI Maritime Mobile Service Identity 1 TDMA 2 TDMA 1 DSC DSC 13 GNSS 7 1 AIS A Seg eis
55. 25 6 1 2 27 6 1 3 sraa 29 6 1 4 oron 29 6 2 39 6 2 1 noro 32 6 2 2 32 623 or ra a W pate ara EN aa 39 6 2 4 orooro a 32 V 33 1 34 2 MA 35 1 AIS 36 2 AIS 38 3 47 4 49 1 a Re Te EA ae ee ee ie See ee ce ee 56 2 59 3 AIS 60 4 ITU R M 1371 3 61 5 IEO62287 1
56. 50km 55km 2 27MHzDSB km 1 dB V m dB V m 10 41 20 32 30 25 40 20 19 50 16 18 8 90 6 100 4 60km 8 20 10 D m
57. AIS 2 1 AIS 1 1 AIS Automatic Identification System A AIS SOLAS AIS AIS AIS AIS AIS Sik AIS AIS
58. Signal generator A Receiver under test Message measuring test set Combiner Signal generator B IEC 270 06 Figure 13 Measurement arrangement with two generators The measurement procedure shall be as follows a two generators A and B shall be connected to the receiver via a combining network b the wanted signal provided by signal generator A shall be at the nominal frequency of the receiver and shall be modulated to generate test signal number 5 c the unwanted signal provided by generator B shall also be at the nominal frequency of the receiver Generator B shall be modulated to generate test signal number 4 either continuously or in the same time period as that used by generator A for test signal number 5 The content of the wanted and unwanted signals shall not be synchronised d the level of the wanted signal from generator A shall be adjusted to 101 dBm e the level of the unwanted signal from generator B shall be adjusted to 111 dBm f the message measuring test set shall be monitored and the packet error rate PER observed 87 62287 1 IEC 2006 E 61 g the measurement shall be repeated for displacements of the unwanted signal of 1 kHz11 from the nominal frequency of the receiver and the PER again observed h the test shall be carried out on the lowest TDMA frequency declared by the manufacturer and AIS 2 162 025 MHz 11 2 3 3 Required
59. 1 107dBm RF PER 20 IEC 62287 1 11 2 1 2 77dBm 7dBm RF 77dBm PER 2 IEC 62287 1 7dBm PER 10 11 2 2 3 PER 20 IEC 62287 1 RF 101dBm 11 2 3 RF 101dBm 4 PER 20 IEC 62287 1 RF 101dBm 11 2 4 400Hz
60. 11 1dBV m 106 27524MHz 0 1 2 3 4 5 6 7 B 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 27 524MHz 100 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 21 22 23 90 0 80 0 60 0 108 27 524MHz 100 0 90 0 0 1 2 3 4 5 6 7 8 9 10
61. 2 27MHz 1mW 40MHz 1mW 60dB 150MHz 100 uW 6 27MHz 50 uW 40MHz 50 W 150MHz 50 uW 6 1 2 2 1 4nW 2 amp 7 ki ER ms 10V J 70 10uV 20dBuV 93dBm 1 1000Hz30 10uV 20dBuV 93dBm SINAD Signal to Noise and Distortion 20dB 3
62. 5 BBV 104 7 27524kHz 1 27MHz bizs 1 19 11 28 14 12 7 7 19 12 12 14 20 1 18 9 2 2496 3 27MHz 4 5 27 524MHz 1 4 1 8 8kHz E3 0dB u V m
63. PER 20 IEC 62287 1 RF 101dBm 11 2 7 500kHz 23dBm 1MHz 23dBm 1 2MHz 23dBm 5MHz 15dBm 10MHz 15dBm 8 UTTD 5 eB SNS BIRO 5B 9kHz 1GHz 2nW 57dBm AF IEC 62287 1 1GHz 4GHz 20nW 47dBm 11 3 1 45 4 1 15C 35 C IEC62287 1 20 75 8 2 1 B 3 2 10 3 55 3 10 1 2 3
64. 50dB 0 3ms 3dB 0 3ms 3 TDMA TDMA DSC TDMA TDMA DSC 107dBm PER 209 77dBm 7dBm PER e 77dBm PER 2 7dBm PER 10 101dBm 101dBm PER 20
65. 64 62287 1 IEC 2006 E 11 2 5 6 Required results At any frequency separated from the nominal frequency of the receiver by two channels or more the spurious responses shall not result in a PER of greater than 20 11 2 6 Intermodulation response rejection 11 2 6 1 Definition The intermodulation response rejection is the capability of the receiver to receive a wanted modulated signal without exceeding a given degradation due to the presence of two close spaced unwanted signals with a specific frequency relationship to the wanted signal frequency 11 2 6 2 Method of test Signal generator Signal s Receiver Message generator Combiner under measuring B test test set Signal generator IEC 272 06 Figure 15 Measurement arrangement for intermodulation The measurement procedure shall be as follows a three signal generators shall be connected to the receiver via a combining network b the wanted signal provided by signal generator A shall be at the nominal frequency of the receiver and shall be modulated to generate test signal number 5 c the unwanted signal from generator B shall be unmodulated d the unwanted signal from generator C shall be frequency modulated with a 400 Hz sine wave giving a deviation of 3 kHz e the signal level from generator A wanted shall be set for 101 dBm at the receiver input f the signal level from generators B and C shall be set for 36 dBm at t
66. 10 0 1mW 101 25m 11 12 1 ID 0 5 3 45 102 SN
67. IMO ITU IEC IEC I International Electrotechnical Commission 1908 1 1 1953 JISC TC Technical Committee TC18 TC18 SC18A TC80 IMO IMO International Maritime Organization 1958 33 IMCO Inter Governmental Maritime Consultative Organization 1982 57
68. 40MHz 20 x 10 LAA 150MHz 10x 10 2 6 1 2 1 6 2 2 2 6 1 2 2 6 2 3 6 1 3 6 2 4 6 1 4 32 V AIS R 33 1 24 xir EY Dili St xi HA
69. 1 1 10 11dB 10 97 10 14 15dB u V m 6 1200bps
70. 20 2bit 20 2bit sm 27524kHz foe aoe sae MABE ooo rows 7 EE PF oo a foo ame oe SRS Sol 55 1 SOLAS 1914 SOLAS 1974 F SOLAS E ml 2 BIIT BIIT Built In Integrity Test
71. 50dB 6 1 3 1 10 Bee 2 10 SO CO SRA ChE lt HET OC a i uk at f 3 Rii 35 C 95 4 15 6 1 4 ASE 26 1MHz 28MHz 29 7MHz 41MHz 146MHz 162 0375MHz 29 6 1 1 2 3 4 1 10
72. CDV CDV Ik Committee Draft for Vote CDV 2 3 1 4 COMSAR COMSAR Sub Committee on Radiocommunications and Search and Rescue MSC DGNSS DGNSS Differential Global Navigation Satellite System MR GNSS 56 FDIS FDIS Final Draft International Standard 2 GNSS GNSS Global Navigation Satellite System GPS GLONASS IALA IALA International Association of Marine Aids to Navigation and Lighthouse Authorities 1957
73. ECC 0 XOR 5 1 10 7 3 1 b0 b6 CH 0 127 b b9 0 b7 b9 1 ct MSB b9 b7 LSB 0 1110000000 bO b7 0 7 111 0110000100 bO b7 0 6 110 011 7 0010000111 bO b7 0 6 100 001
74. 10 F 3dB 1 50dB 2 TDMA S428 3 19 4 4 1 HHA ey KI 6 3 82 5 5 2 20 27MHz 40MHz 150MHz 1 2
75. 10 2 1 1 5 msg1 2 3 4 5 8 12 14 15 18 20 IEC 61993 2 21 22 23 24 6 11 10 2 40 6 DSC msg22 ITU R M 1371 Annex2 4 1 IEC62287 1 4 1 5 10 4 Annex C 3 2 4 2 TDMA 1 2 0 5kHz WR BRR ITU R M 1371 2 1 0kHz IMO MSC74 69 Annex3 7 IEC 62287 1 11 1 1 2 2 33dBm 1 5dBm ITU R M 1371 2
76. 2 5W Category D 2 62 5kHz 9kHz 10 5 1 1 0 3ms 3bits ITU R M 1371 2 0 3ms 3bits Annex2 3dB 2 12 1 IEC 62287 1 2 11 1 5 50dB 6 ITU R M 1371 Annex2 2 15 43 3 TDMA ER
77. 3 1 3 2 3 3 3 4 4 gaan 4 1 4 2 4 3 hb mm 5 5 1 5 2 i ae a wh tt a a a Ga Si E 5 3 5 4 23 6 25 eai AG OS eS SI wwie ee Ga 5 25 6 1 1
78. 5 6 AM DSB 98 7 27MHz 7 27MHz 709 809
79. oe 82 6 94 7 105 II I 50 AIS I 1 2 1 1 4 19 10 18 HEF 50 2 5 20 3 14 AIS
80. 17 2K 500kHz 23dBm 1MHz 23dBm 2MHz 23dBm OMHz 15dBm 10MHz 15dBm 2nW 3 3 1 10 2 15C 55 Es 3 40C 93 4 2 5Hz 13 2Hz lmm 10 13 2Hz 7m s 13 2Hz 100Hz 7m s 3 4 2 1 TDMA 2
81. 3 5 1 4 Short safety related messages Short safety related messages if transmitted should be in compliance with 3 12 Annex 8 and should use pre configured contents It should not be possible for the user to alter the pre configured contents 4 Note that in this case the synchronization process will not take into account distance delays 63 74 Rec ITU R M 1371 3 3 5 2 Information reporting intervals The Class B CS AIS should transmit position reports Message 18 in reporting intervals of 30s if SOG gt 2 knots 3min SOG 2 knots provided that transmission time periods are available A command received by Message 23 should override the reporting interval a reporting interval of less than 5 s is not required Static data sub messages 24A and 24B should be transmitted every 6 min in addition to and independent of the position report see 4 4 1 Message 24B should be transmitted within 1 min following Message 24A 3 5 3 Transmitter shutdown procedure An automatic transmitter shutdown should be provided in the case that a transmitter does not discontinue its transmission within 1 s of the end of its nominal transmission This procedure should be independent of the operating software 3 5 4 Static data input Means should be provided to input and verify the MMSI prior to use It should not be possible for the user to alter the MMSI once programmed 4 Technical requirements 4 1 General
82. 4 1 1 2 EOS 3 200 4 EOS ECC 5 27524kHz 2100Hz 5 6 7
83. AIS 2 2 2 2 1 ITU R M 1371 3 IEC62287 1 ITU R M 1371 CSAIS AIS AIS B AIS VHF AIS AIS A 2 IEC62287 1Ed 1 CSAIS 24 4 15 10 IMA HLT OO REHERO folk EO RRR SH Lt ODEMHASK AIS 11 1 2 2 3 I
84. AlS IV LAN SOLAS AIS
85. X AIS 3 JE RE 35 1 AIS oe No me 0 1 Yes 2 No 2 Yes No 3 ETER yes No 4 Yes No 5 Yes No i dialed 7 ia Y 7 No No 8 Yes No 9 SAR Opt No 10 UTC No No 11 UTC Opt No 12 elas das Yes i Y msg12
86. A station operating in the assigned mode should use a transmission schedule assigned by a competent authority s base station This mode is initiated by a group assignment command Message 23 The assigned mode should affect the transmission of scheduled position reports except the Tx Rx mode and the quiet time command which also affect static reports If a station receives this group assignment command and belongs to the group addressed by region and selection parameters it should enter into assigned mode which should be indicated by setting the Assigned Mode Flag to 1 To determine whether this group assignment command applies to the recipient station it should evaluate all selector fields concurrently 86 Rec ITU R M 1371 3 When commanded to a specific transmission behaviour Tx Rx mode or reporting interval the mobile station should tag it with a time out randomly selected between 4 and 8 min after the first transmission After the time out has elapsed the station should return to autonomous mode When commanded to a specific reporting rate the AIS should transmit the first position report with assigned rate after a time randomly selected between the time the Message 23 has been received and the assigned interval to avoid clustering Any individual assignment command received should take precedence over any group assignment command received i e the following cases should be applied if Message 22 is indivi
87. 0 001 L9 1 0 0001 35 12 4567N 135 34 5678E NE 0 L1 03 L2 51 L3 24 L4 56 L5 71 L6 35 L7 34 L8 56 L9 78 7 0 1kt 1 0 1024 9999 2 V1 2 V2 2 12 3kt 123 V1 01 V2 23 8 WHK 0 1 1 0 lt 3600 9999 2 D1 2 D2 2 12 3 123 D1 01 D2 23 123 4 1234 D1 12 D2 34 9 1 00 99 2 S 2 2 2 S 02 52 r d Boy OE 12945670910 BBBBBBBYYY TBBBBBBTYYB BYBBBBBYYB YYBBBBBYBY BBYBBBBYYB YBYBBBBYBY BYYBBBBYBY YYYBBBBYBB BBBYBBBYYB YBBYBBBYBY BYBYBBBYBY YYBYBBBYBB BBYYBBBYBY YBYYBBBYBB BYYYBBBYBB YYYYEBBEYY BBBBYBBYYB YEBBYBBYBY BYBBTBBYBY YYBBYBBYBB BBYBTBBYBY YBYBYBBYBB BYYBYBBYBB YYYEYBBEYY BBBYTBBYBY YBBYYBBYBB BYBYYBBYBB TTYBYTTBBBYY BBYYYBBYBB YEYYYBBEYY BYYYYBBBYY
88. D11 12 13 14 15 16 17 18 19 es 20 10 0 i 21 gt 22 0 238 80 0 60 0 50 0 2008 1 1 2008 1 2 2008 1 3 2008 1 4 2008 1 5 2008 1 6 2008 1 7 2008 1 8 2008 1 9 f 2008 1 10 2008 1 11 2008 1 12 2008 1 13 2008 1 14 2008 1 15 2008 1 16 2008 1 17 2008 1 18 109
89. Signal generator B shall be switched on and adjusted to 27 dBm at the receiver The frequency of the unwanted signal shall be varied in steps of 5 kHz over the Limited Frequency Range from LFR o to ZFRHI The frequency of any spurious response detected by an increase in either PER or BER during the search shall be recorded for use in the next measurements In the case where operation using a continuous packet stream is not possible a similar method may be used 11 2 5 5 Method of measurement at identified frequencies a b c d Two generators A and B shall be connected to the receiver via a combining network The wanted signal provided by generator A shall be at the nominal frequency of the receiver and shall be modulated to generate test signal number 5 The unwanted signal provided by generator B shall be frequency modulated with a 400 Hz sine wave giving a deviation of 3 kHz Generator B shall be at the frequency of that spurious response being considered Initially generator B unwanted shall be switched off maintaining the output impedance The signal level from generator A wanted shall be adjusted 101 dBm at the receiver Generator B shall be switched on and the level of the unwanted signal set to 31 dBm For each frequency noted during the tests over the Limited Frequency Range and the Specific Frequencies of Interest SF and SFI transmit 200 packets to the EUT and note the PER 90
90. The maximum usable sensitivity is the minimum level of signal dBm at the receiver input produced by a carrier at the nominal frequency of the receiver modulated with the typical test signal test signal 5 which will without interference produce after demodulation a data signal with a specified packet error rate PER 11 2 1 2 Method of measurement Message Signal Receiver Message generator generator under measuring test test set EC 269 06 Figure 12 Measurement arrangement The measurement procedure shall be as follows a the signal generator shall be at the nominal frequency of the receiver and shall be modulated to generate test signal number 5 b the signal level at the input of the receiver shall be set to 107 dBm c the message measuring test set shall be monitored and the packet error rate observed The PER shall be derived by the following formula PER Pry PRx PTx x100 where PRx is the number of packets received without errors PTx is the number of transmitted packets d the test shall be repeated at the nominal carrier frequency 500 Hz and the level at the input to the receiver adjusted to 104 dBm under normal conditions e the test shall be carried out on the lowest TDMA frequency declared by the manufacturer and AIS 2 162 025 MHz f repeat under extreme conditions at the nominal carrier frequency only The signal generator shall be adjusted so the level at the input to the re
91. This section covers layers 1 to 4 physical layer link layer network layer transport layer of the OSI model see Annex 2 1 4 2 Physical layer The physical layer is responsible for the transfer of a bit stream from an originator to the data link 4 2 1 Transceiver characteristics General transceiver characteristics should be as specified in Table 31 4 2 1 1 Dual channel operation The AIS should be capable of operating on two parallel channels in accordance with 4 41 Two separate TDMA receive channels or processes should be used to simultaneously receive information on two independent frequency channels One TDMA transmitter should be used to alternate TDMA transmissions on two independent frequency channels Data transmissions should default to AIS 1 and AIS 2 unless otherwise specified by a competent authority as described in 4 4 1 and 4 6 4 2 1 2 Bandwidth The Class B AIS should operate on 25 kHz channels according to Recommendation ITU R M 1084 4 and RR Appendix 18 Rec ITU R M 1371 3 75 TABLE 31 Transceiver characteristics Symbol Parameter name Value Tolerance PH RFR Regional frequencies range of frequencies within RR 161 500 Appendix 18 MHz to Full range 156 025 to 162 025 MHz is also allowed 162 025 This capability will be reflected in Message 18 PH CHS Channel spacing encoded according to RR 25 Appendix 18 with footnotes kHz Channel bandwidth PH AIS1
92. YYYYYBBBYB BBBBBYBYYB YBBBBYBYBY BYBBBYBYEY YYBBBYBYBB BBYBBYBYBY YBYBBYBYBB BYYBBYBYBB YYYBBYBBYY BBBYBYBYBY YBBYBYBYBB BYBYBYBYBB 43 44 45 46 47 4g 4g 50 51 57 53 54 55 56 57 5 59 BO BI G E B4 85 BB BT BB Bd 70 71 72 73 74 75 76 77 78 79 80 1 82 83 84 85 1 Bow OTE 12345670910 YYEYEYBEYY BBYYBYBYBB YBYYBYBBYY BYYYBYBBYY YYYYBYBBYB BBBBYYBYBY YBBBYYBYBB BYBBYYBYBB TTYTBBTTBBYT BBYBYYBYBB YBYBY YBBYY BYYBYYBBYY YYYBYYBBYB BBBYYYBYBB YBBYY YBBYY BYBYYYBBYY YYBYYYBBYB BBYYYYBBYY YEYYYYEBYE BYYYYYBBYB YYYYYYBBBY BBBBBBYYYB YBBBBBYYBY BYBBBBYYBY YYBBBBYYBB BBYBBBYYBY YBYBBBYYBB BYTYBBBYYBB TTYTBBBYTBYT BBBYBBYYBY YBBYBBYYBB BYBYBBYYBB YYTBTBBYBYT BBYYBBYYBB YBYYBBYBYY BYYYBBYBYY YYYYBBYBYB BBBBYBYYBY YBBBYBYYBB BYBBYBYYBB TTYTBBTBTBYT BBYBYBYYBB YBYBYBYBYY 10 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 114 120 121 122 123 124 125 126 127 Ey OG 123456708910 BYYBYBYBYY YYBYBYBYB BBBYYBYYBB TBBYYBTBYT BTBYTBTBYT YYEYYBYBYE BBTYYBTBYT TBTYTBTBYB BYYYYBYBYB YYYYYBYBEY BBBBBTTYBT YBBBBYYYBB BYBBBYYYBB TTYTBBBTTBYT BBYBBYYYBB TBTBBTTBYT BTTBBTTBYT TTYTBBTTBYB BBBYBYYYBB YBBYBYYBYY BYBYBYYBYY YTBYBYYBYB BBYYBYYBYY TBTYBTTBYB BTTYBTTBYB TTYTTBTTBBY BBBBYYYYBB YBBBY YYBYY BYBBYYYBYY YYTBBYTTBYB BB
93. and AIS 2 162 025 MHz 11 2 4 3 Required results The PER shall not exceed 20 11 2 5 Spurious response rejection 11 2 5 1 Definition The spurious response rejection is a measure of the capability of the receiver to receive a wanted modulated signal without exceeding a given degradation due to the presence of an unwanted modulated signal at any other frequency at which a response is obtained 11 2 5 2 Manufacturers declarations The manufacturer shall declare the following in order to calculate the Limited Frequency Range over which the initial part of the test will be performed e list of intermediate frequencies F F2 J Fy in Hz 11 which is twice the allowable transmit frequency tolerance 88 62 62287 1 IEC 2006 E e switching range of the receiver12 e frequency of the local oscillator13 at AIS 2 and at the lowest TDMA channel flon JLo 11 2 5 3 Introduction to the method of measurement The initial evaluation of the unit shall be performed over the Limited Frequency Range and shall then be performed at the frequencies identified from this test and at Specific Frequencies of Interest as defined below To determine the frequencies at which spurious responses can occur the following calculations shall be made a calculation of the Limited Frequency Range the limits of the limited frequency range LFR ZFRLoO are determined from the following calculati
94. 0 Synchronization jitter should not exceed 3 bits 312 us from the average of the received position reports That average should be calculated over a rolling 60 s period If these AIS stations are no longer received the unit should maintain synchronization for a minimum of 30 s and switch back to sync mode 2 after that Other synchronization sources fulfilling the same requirements are allowed optionally instead of the above 4 3 1 1 2 Sync mode 2 no station other than Class B CS is received In the case of a population of Class B CS stations alone in the absence of any other class of station that can be used as a synchronization source the Class B CS station should determine the start of time periods To according to its internal timing If the Class B CS unit receives an AIS station that can be used as a synchronization source being in sync mode 2 it should evaluate timing and synchronize its next transmission to this station Time periods reserved by a base station should still be respected 67 78 Rec ITU R M 1371 3 4 3 1 2 CS detection method Within a time window of 1 146 us starting at 833 us and ending at 1 979 us after the start of the time period intended for transmission To the AIS Class B CS should detect if that time period is used CS detection window NOTE 1 Signals within the first 8 bits 833 us of the time period are excluded from the decision to allow for propag
95. 55 Beginning of data TE 25 729 247 Beginning of end buffer nominal end of transmission assuming 0 bit stuffing Tr 26 042 250 Nominal end of ramp down power reaches 50 dBc To 26 667 256 End of time period start of next time period 73 84 Rec ITU R M 1371 3 4 3 2 5 Long transmission packets Autonomous transmissions are limited to one time period When responding to an interrogation by a base station for Message 19 the response may occupy two time periods 4 3 2 6 Error detection and control Error detection and control should be handled using the CRC polynomial as described in 4 3 2 2 7 CRC errors should result in no further action by the Class B CS 4 3 3 Link sub layer 3 link management entity LME The LME controls the operation of the DLS MAC and the physical layer 4 3 3 1 Access algorithm for scheduled transmissions The Class B CS should use a CSTDMA access using transmission periods which are synchronized to periods of RF activity on the VDL The access algorithm is defined by the following parameters in Table 38 TABLE 38 Access parameters Term Description Value Reporting interval RI Reporting interval as specified in 3 5 2 5s 10 min Nominal transmission time Nominal time period for transmission defined by NTT RI Transmission interval TI Time interval of possible transmission periods TI or 10 8 centred around NTT whichever is less Candid
96. AIS 1 default channel 1 2 087 MHz 161 975 3 ppm PH AIS2 AIS 2 default channel 2 2 088 MHz 162 025 3 ppm PH BR Bit rate bit s 9 600 50 ppm PH TS Training sequence bits 24 GMSK transmitter BT product 0 4 GMSK receiver BT product 0 5 GMSK modulation index 0 5 See Recommendation ITU R M 1084 Annex 4 2 In some Regions the competent authority may not require DSC functionality 4 2 1 2 Bandwidth The Class B AIS should operate on 25 kHz channels according to Recommendation ITU R M 1084 4 and RR Appendix 18 4 2 1 3 Modulation scheme The modulation scheme is bandwidth adapted frequency modulated Gaussian filtered minimum shift keying GMSK FM The NRZI encoded data should be GMSK coded before frequency modulating the transmitter 4 2 1 4 Training sequence Data transmission should begin with a 24 bit demodulator training sequence preamble consisting of one segment synchronization This segment should consist of alternating zeros and ones 0101 This sequence always starts with a 0 4 2 1 5 Data encoding The NRZI waveform is used for data encoding The waveform is specified as giving a change in the level when a zero 0 is encountered in the bit stream Forward error correction interleaving or bit scrambling is not used 4 2 1 6 DSC operation The Class B CS AIS should be capable of receiving DSC channel management commands It should either have a dedicated receive process o
97. CSAIS ITU R M 1371 3 IEC62287 1 Ed 1 CSAIS AIS FAH AS 2 AIS 2 1 2 1 1 1 2 CSAIS ITU R ITU ITU R ITU R Necommendation AIS 1998 ITU R M 1371 CSAIS CSAIS Annex 7 M 1371 1 2006 2 ITU R M 1371 2 2007 3 M 1371 3 IEC IEC
98. IEC62287 1 Ed 1 AIS B 2007 02 IEC62320 1 Ed 1 AIS 2007 06 M 1371 3 2007 08 AISWG1 AIS AtoN FDIS 2007 10 MSC 83 AIS SART 2008 08 AISWGO1 AIS Repeater Station CDV 2 3 AIS Technical characteristics for a universal ITU R M 1371 1998 11 shipborne automatic identification system using time division multiple access in the VHF maritime Superseded mobile band Technical characteristics for a universal ITU R M 1371 1 shipborne automatic identification system using 2001 08 time division multiple access in the VHF maritime Super seded ITU mobile band Technical characteristics for a universal ITU R M 1371 2 l aa Np shipborne automatic identification system using 2006 03 f re En time division multiple access in the VHF maritime Super seded mobile band ITU R M 1371 3 Technical characteristics for an automatic 2007 06 identification system using time division In force multiple access in the VHF maritime mobile band PERFORMANCE STANDARDS FOR AN UNIVERSAL SHIPBORNE IMO MSC74 69 Annex3 IMO AUTOMATIC IDENTIFICATION SYSTEM AIS IMO MSC246 83 PERFORMANCE STANDARDS FOR AIS SART Part2 Class A shipborne equi
99. as used in reference to 4 3 1 2 USED VDL has been identified as used in reference to 4 3 1 2 UNAVAILABLE time periods should be indicated as UNAVAILABLE if they are reserved by base stations using Message 20 regardless of their range 69 80 Rec ITU R M 1371 3 Time periods indicated as UNAVAILABLE should not be considered as a candidate time period for use by own station and may be used again after a time out The time out should be 3 min if not specified or as specified in Message 20 4 3 2 Link sub layer 2 data link service DLS The DLS sub layer provides methods for data link activation and release data transfer or error detection and control 4 3 2 1 Data link activation and release Based on the MAC sub layer the DLS will listen activate or release the data link Activation and release should be in accordance with 4 3 1 4 4 3 2 2 Data transfer Data transfer should use a bit oriented protocol which is based on the high level data link control HDLC as specified by ISO IEC 3309 1993 Definition of packet structure Information packets I Packets should be used with the exception that the control field is omitted see Fig 38 FIGURE 38 Transmission packet Traini St 1371 38 4 3 2 2 1 Bit stuffing The bit stream should be subject to bit stuffing This means that if five consecutive ones 1 s are found in the output bit stream a zero should be inserted T
100. band emissions 11 3 2 2 Method of measurement The transmitter shall be connected to a 50 Q power attenuator The output of the power attenuator shall be connected to a measuring receiver If possible the measurement shall be made with the transmitter unmodulated If this is not possible the transmitter shall be modulated by test signal number 4 If possible the modulation should be continuous for the duration of the measurement The measurement shall be made over a frequency range from 9 kHz to 4 GHz excluding the channel on which the transmitter is operating and its adjacent channels The resolution bandwidth of the measuring instrument shall be the smallest bandwidth available which is greater than the spectral width of the spurious component being measured This shall be considered to be achieved when the next highest bandwidth causes less than 1 dB increase in amplitude Positive peak detection maximum hold shall be selected on the spectrum analyser used for this measurement 93 6 1 27MHz
101. continuous mode An autonomous and continuous mode for operation in all areas transmitting Message 18 for scheduled position reporting and Message 24 for static data The Class B CS AIS should be able to receive and process messages at any time except during time periods of own transmission 2 1 2 2 Assigned mode An assigned mode for operation in an area subject to a competent authority responsible for traffic monitoring such that the reporting interval silent mode and or transceiver behaviour may be set remotely by that authority using group assignment by Message 23 or 61 72 Rec ITU R M 1371 3 time periods are reserved by Message 20 see 3 18 Annex 8 2 1 2 3 Interrogation mode A polling or controlled mode where the Class B CS AIS responds to interrogations for Messages 18 and 24 from a Class A AIS or a base station A base station interrogation for Message 19 specifying transmission offset should also be answered An interrogation overrides a silent period defined by Message 23 see 3 21 Annex 8 A Class B CS AIS should not interrogate other stations 3 Performance requirements 3 1 Composition The B CS AIS should comprise A communication processor capable of operating in a part of the VHF maritime mobile service band in support of short range VHF applications At least one transmitter and three receiving processes two for TDMA and one for
102. related broadcast 3 12 Optional Optional Transmit with predefined text only see 4 3 3 7 To Assigned mode command 3 21 DGNSS broadcast binary 3 15 Optional message Class B CS should respond to interrogations for Message 18 and Message 24 It should also respond to interrogations for Message 19 by a base station Message 23 is applicable to the CS A Class B CS AIS should indicate 1 for 18 Standard Class B 3 16 Optional Y equipment position report CS in flag bit 143 Extended Class B 3 17 Optional Y Transmit ONLY as equipment position report response on base station interrogation aa Use of that function may be different in certain regions Aids to navigation report 3 19 22 Channel management 3 20 Yes message es Group assignment 32 Class B CS static data 3 22 Part A and Part B 6 13 14 15 17 20 Data link management 3 18 Yes message 23 4 25 Single slot binary 3 23 Optional message 2 Mult slot binary message No with Communications State a Reserved for future use Receive and process in this table means functionality visible for the user e g output to an interface or display For synchronization it is necessary to receive and internally process messages according to 4 3 1 1 this applies to Messages 1 2 3 4 18 19 78 No No No es es No No No No Yes No No No R
103. s specification h testing shall be repeated under extreme test conditions 11 1 4 3 Required results Peak frequency deviation at various points within the data frame shall comply with Table 22 These limits apply to both the positive and negative modulation peaks Bit 0 is defined as the first bit of the training sequence 84 58 62287 1 IEC 2006 E Table 22 Peak frequency deviation versus time Measurement period from Test signal 2 Test signal 3 centre to centre of each bit Bit 0 to bit 1 Bit 2 to bit 3 2 400 480 Hz Bit 4 to bit 31 2 400 240 Hz 2 400 480 Hz 2 400 240 Hz 2400 480 Hz Bit 32 to bit 199 1 740 175 Hz 1 740 350 Hz 2 400 240 Hz 2 400 480 Hz 11 1 5 Transmitter output power versus time function 11 1 5 1 Definition Transmitter output power versus time function is a combination of the transmitter delay attack time release time and transmission duration referring to Figure 3 where a transmitter delay 7 is the time between the start of the candidate transmission time period and the time when the transmission power exceeds 50 dBc b transmitter attack time Tg Ta is the time between the transmit power exceeding 50 dBc and the moment when the transmit power has reached a level 1 dB below the measured steady state power Pss and maintains a level within 1 5 1 dB from P thereafter c transmitter release time TE Tg is the time between the end fl
104. 0 2 10 3 4 eae EN 27MHz 27524kHz pig
105. 73 TY 21 YG 44 MG 74 GF 22 EH 50 FS 75 AC 23 KA 51 HK 80 zm JT A dl Jm HH dl SO 24 TO 52 ON 90 ME 25 KO 53 1 2 0 1 2 3 4 5 6 7 8 9 4 2 7 19 2123456 0 KN2 123456 KN 19 2123456 0 2 7 7 60 0123456 2 123456 60 0123456 2 2 7 7 01 0000001 7 48
106. DSC on channel 70 The DSC process may use the receiving resources on a time share basis as described in 4 2 1 6 Outside the DSC receiving periods the two TDMA receiving processes should work independently and simultaneously on AIS channels A and B3 A means for automatic channel switching in the maritime mobile band by Message 22 and DSC Message 22 should have precedence Manual channel switching should not be provided An internal GNSS position sensor which provides a resolution of one ten thousandth of a minute of arc and uses the WGS 84 datum see 3 3 3 2 Operating frequency channels The Class B CS AIS should operate at least on the frequency channels with 25 kHz bandwidth in the range from 161 500 MHz to 162 025 MHz of the RR Appendix 18 and in accordance with Recommendation ITU R M 1084 Annex 4 The DSC receiving process should be tuned to channel 70 The Class B CS AIS should automatically revert to receive only mode on the channels AIS1 and AIS2 when commanded to operate at frequency channels outside its operating range and or bandwidth 3 3 Internal GNSS receiver for position reporting The Class B CS AIS should have an internal GNSS receiver as source for position COG SOG The internal GNSS receiver may be capable of being differentially corrected e g by evaluation of Message 17 2 Note that because Message 19 is a message occupying two time periods this requires the reservation of
107. EC62287 1 CSAIS AIS AIS IEC61162 PC CSAIS 2 2 4 CSAIS IEC62287 1 2 HAZ AIS 2 2 5 AIS AIS
108. Hz 157 93MHz 158 09MHz 158 17MHz 158 49MHz 158 57MHz 158 81MHz 158 85MHz 158 89MHz 159 21MHz 2 A2D 4 MSK Ol NRZ ml Du SS at dig h ar 25 6 1 200 2 400 7 1 200 1 200Hz 1 800Hz 2 400 1 200Hz 1 800Hz 8 70 100 9 7 Z o
109. TBTTTBYT TBYTBTTTBYB BYTTBYTTBYB TTYTTBTTTBBT BBBYYYYBYY TBBYYTTBYB BTBYTTTBYB TTYTBTTTTBBY BBTYYTTBYB TBTYTTTBBT BYTTTTTTBBY TTYTTTTTTBBB 53 1 4 Fil ms 0 166 6 333 3 500 666 6 833 3 1000 1166 6 1333 3 1500 1666 6 1200bps bit 0 200 400 600 800 1000 1200 1400 1600 1800 2000 db hh ob hin nn 06s E JE DP PS F I A K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 s lc pe ee epee a ae som Py 4 oon WERT Ps rom amras K women Pr sora enee eo iezbt REES for aoe F A come a Pr soe oo rome E0S ECC 54 2 ms 0 83 3 166 6 250 333 3 416 6 500 583 3 666 6 1200bps bit 0 100 200 300 400 500 600 700 800 1 ae DP PS F I L V D S EOS P 0 2S gt 600bit 90 2bit eee u 10 4bit 60 80bit V 20 2bit 10 2bit ay
110. V m s xt sec V m s 20 x 1852m 3600 10 29m 10 29 x 10 102 9m 50m 100m 150m 200m 1 HAHA D m E 100 150 200 250 300 100 2 3cm 4cm 5cm m dB V m dB V m dB V m dB V m 50 46 6 45 2 47 7 49 7 100 34 5 33 3 35 8 37 7 150 30 1 26 3 28 8 30 7 200 25 5 21 3 23 8 25 7 250 21 1 17 4 19 9 21 8 300 17 3 14 2 16 7 18 7 9 24 dB V m 200m 0 1mW
111. ag being transmitted and the moment when the transmitter output power has reduced to a level 50 dB below P and remains below this level thereafter d transmission duration Tp 7A is the time from when power exceeds 50 dBc to when the power returns to and stays below 50 dBc 11 1 5 2 Method of measurement a The measurement shall be carried out by transmitting test signal number 2 note that this test signal generates one additional stuffing bit within its CRC portion b The EUT shall be connected to a spectrum analyser A resolution bandwidth of 1 MHz video bandwidth of 1 MHz and a sample detector shall be used for this measurement The analyser shall be in zero span mode for this measurement c For the purposes of this test the EUT shall be equipped with a test signal SYNC indicating the start of each time period that it intends to transmit into This will be used as a trigger source for the spectrum analyser The SYNC signal shall be aligned to the nominal start time 79 of the transmission time period d Tests shall be performed on the lowest operating frequency on which the EUT can transmit according to the manufacturer s specification and AIS 2 162 025 MHz 11 1 5 3 Required result The transmitter power shall remain within the mask shown in Figure 3 and associated timings given in Table 6 85 62287 1 IEC 2006 E 59 11 2 TDMA receivers see 7 2 3 11 2 1 Sensitivity 11 2 1 1 Definition
112. ate period CP Time period where a transmission attempt is made excluding time periods indicated unavailable Number of CP in TI 10 The CSTDMA algorithm should follow the rules given below see Fig 41 1 Randomly define 10 CP in the TI 2 Starting with the first CP in TI test for CS 4 3 1 2 and transmit if the status of CP is unused otherwise wait for the next CP 3 Transmission should be abandoned if all 10 CPs are used 4 3 3 2 Access algorithm for unscheduled transmissions Unscheduled transmissions except responses to interrogations by a base station should be performed by assigning a nominal transmission time within 25 s of the request and should use the access algorithm described in 4 3 2 1 If the option to process Message 12 is implemented an acknowledgement Message 13 should be transmitted in response to Message 12 on the same channel with up to 3 repetitions of the access algorithm if needed Rec ITU R M 1371 3 85 FIGURE 41 Example of CSTDMA access a A a a NTT 0 5TI NTT 0 5TI RI NTT Time period of status used Time period used of own transmission 1371 41 4 3 3 3 Modes of operation There should be three modes of operation Autonomous default mode Assigned Interrogation 4 3 3 3 1 Autonomous A station operating autonomously should determine its own schedule for the transmission of its position reports 4 3 3 3 2 Assigned
113. ation delays and ramp down periods of other units The Class B CS AIS should not transmit on any time period in which during the CS detection window a signal level greater than the CS detection threshold 4 3 1 3 is detected The transmission of a CSTDMA packet should commence 20 bits Ta 2 083 us To after the nominal start of the time period see Fig 36 FIGURE 36 Carrier sense timing Rx signal level Example of incoming RF Threshold level Time us CS detection 4 1371 36 4 3 1 3 CS detection threshold The CS detection threshold should be determined over a rolling 60 s interval on each Rx channel separately The threshold should be determined by measuring the minimum energy level representing the background noise plus an offset of 10 dB The minimum CS detection threshold should be 107 dBm and background noise should be tracked for a range of at least 30 dB which results in a maximum threshold level of 7 dBm 6 4 3 1 4 VDL access The transmitter should begin transmission by turning on the RF power immediately after the duration of the carrier sense window 74 The transmitter should be turned off after the last bit of the transmission packet has left the transmitting unit nominal transmission end Tg assuming no bit stuffing The access to the medium is performed as shown in Fig 37 and Table 34 6 The following example is compliant with the requirement Sample th
114. bed in 4 3 2 2 5 4 3 2 2 9 End buffer bit stuffing 4 bits Rec ITU R M 1371 3 83 The probability of 4 bits of bit stuffing is only 5 greater than that of 3 bits refer to Annex 2 3 2 2 8 1 ramp down 3 bits distance delay 2 bits A buffer value of 2 bits is reserved for a distance delay equivalent to 30 NM for own transmission A repeater delay is not applicable duplex repeater environment is not supported 4 3 2 3 Summary of the transmission packet The data packet is summarized as shown in Table 36 TABLE 36 Summary of the transmission packet Action Bits Explanation Start buffer CS delay 20 70 to TA in Fig 41 Ramp up 3 TA to TB in Fig 41 Training sequence 24 Necessary for synchronization Start flag 8 In accordance with HDLC 7Eh Data 168 Default CRC 16 In accordance with HDLC End flag 8 In accordance with HDLC 7Eh End buffer Bit stuffing Ramp down 3 Distance delay 2 Total 256 4 3 2 4 Transmission timing Table 37 and Fig 40 show the timing of the default transmission packet one time division TABLE 37 Transmission timing T n Time us bit Description To 0 0 Start of time division beginning of start buffer Ta 2 083 20 Start of transmission RF power is applied Tg 2 396 23 End of start buffer RF power and frequency stabilization time beginning of training sequence Tc 4 896 47 Beginning of start flag Tp 5 729
115. ceiver is 101 dBm 11 2 1 3 Required results The PER shall not exceed 20 11 2 2 Error behaviour at high input levels 11 2 2 1 Definition The error behaviour performance at high input levels noise free operation is defined in the same manner as for the measurement of the maximum usable sensitivity when the level of the wanted signal is significantly above the maximum wanted sensitivity 86 60 62287 1 IEC 2006 E 11 2 2 2 Method of measurement The measurement configuration for receiver sensitivity 11 2 1 shall be used The signal generator shall be at the nominal frequency of the receiver and shall be modulated to generate test signal number 5 The test shall be carried out on the lowest TDMA frequency declared by the manufacturer and AIS 2 162 025 MHz The message measuring test set shall be monitored and the packet error rate observed a The level of the input signal shall be adjusted to a level of 77 dBm b The level of the input signal shall be adjusted to a level of 7 dBm 11 2 2 3 Required results The PER shall not exceed 2 under a and 10 under b 11 2 3 Co channel rejection 11 2 3 1 Definition The co channel rejection is a measure of the capability of the receiver to receive a wanted modulated signal without exceeding a given degradation due to the presence of an unwanted modulated signal both signals being at the nominal frequency of the receiver 11 2 3 2 Method of measurement
116. dually addressed the Tx Rx mode field setting of Message 22 should take precedence over the Tx Rx mode field setting of Message 23 if Message 22 with regional settings is received the Tx Rx mode field setting of Message 23 should take precedence over the Tx Rx mode field setting of Message 22 In the case of Tx Rx mode field the receiving station reverts to its previous Tx Rx mode regional operating setting after the Message 23 assignment has expired When a Class B CS station receives a quiet time command it should continue to schedule NTT periods but should not transmit Messages 18 and 24 on either channel for the time commanded Interrogations should be answered during the quiet period Transmissions of safety related messages may still be possible After the quiet time has elapsed transmissions should be resumed using the transmission schedule as maintained during the quiet period Subsequent quiet time commands received during the first commanded quiet time should be ignored The quiet time command should override a reporting rate command 4 3 3 3 3 Interrogation mode A station should automatically respond to interrogation messages Message 15 from an AIS station see Table 62 Annex 8 Operation in the interrogation mode should not conflict with operation in the other two modes The response should be transmitted on the channel where the Interrogation message was received If interrogated for Message 18 or 24 with no of
117. e VHF data link The method used should be TDMA 4 3 1 1 Synchronization Synchronization should be used to determine the nominal start of the CS time period To 5 In some regions the competent authority may not require DSC functionality 6 Rec ITU R M 1371 3 77 TABLE 33 Receiver parameters Receiver parameters Values Results Wanted signal Unwanted signal s Sensitivity 20 per 107 dBm 104 dBm at 500 Hz offset Error at high input levels 2 per 77 dBm 10 per 7 dBm Co channel rejection 20 per 101 dBm 111 dBm 111 dBm at 1 kHz offset Adjacent channel selectivity 20 per 101 dBm 31 dBm Spurious response rejection 20 per 101 dBm 31 dBm 50 MHz 520 MHz Intermodulation response rejection 20 per 101 dBm 36 dBm Blocking and desensitization 20 per 101 dBm 23 dBm lt 5 MHz 15 dBm gt 5 MHz Spurious emissions 57dBm 9 kHz 1 GHz 47 dBm 1 GHz 4 GHz 4 3 1 1 1 Sync mode 1 AIS stations other than Class B CS are received If signals from other AIS stations complying with Annex 2 are received the Class B CS should synchronize its time periods to their scheduled position reports suitable account should be taken of the propagation delays from the individual stations This applies to message types 1 2 3 4 18 and 19 as far as they are providing position data and have not been repeated repeat indicator
118. e RF signal strength at a rate gt 1 kHz average the samples over a sliding 20 ms period and over a 4 s interval determine the minimum period value Maintain a history of 15 such intervals The minimum of all 15 intervals is the background level Add a fixed 10 dB offset to give the CS detection threshold 68 Rec ITU R M 1371 3 FIGURE 37 Power versus time mask 1 5 dB Pa A 1 dB 3 dB 50 dB N N Tg Tr Training sequence Data Data Data 1371 37 TABLE 34 Definition of timings for Fig 37 Reference bits Time Definition ms Toto Ta 0 0 Start of candidate transmission time period Power should not exceed 50 dB of P T to Ts 20 2 083 Begin of upramping Ts Tay 23 2 396 Power should reach within 1 5 or 3 dB of P Tp 25 2 604 Power should reach within 1 5 or 1 dB of Pss Tz plus 1 248 25 833 Power should still remain within 1 5 or 1 dB of P stuffing bit Tr plus 1 251 26 146 Power should reach 50 dB of steady state RF output stuffing bit power P J and stay below this There should be no modulation of the RF after the termination of transmission Tg until the power has reached zero and next time period begins To 4 3 The VDL state is based on the result of the carrier sense detection see 4 3 1 2 for a time period 15 VDL state A VDL time period can be in one of the following states FREE time period is available and has not been identified
119. e periods in Table 42 This selection should be swapped between the two receive processes TABLE 42 DSC monitoring times Minutes past UTC hour 05 30 05 59 06 30 06 59 20 30 20 59 21 30 21 59 35 30 35 59 36 30 36 59 50 30 50 59 51 30 51 59 If the AIS is utilizing this time sharing method to receive DSC AIS transmissions should still be performed during this period In order to accomplish the CS algorithm the AIS receivers channel 81 5 62287 1 IEC 2006 E 55 10 9 4 1 2 Required results The interface shall be compliant with IEC 61162 series protocol and the manufacturer s documentation of interface hardware 11 Physical tests 11 1 TDMA transmitter see 7 2 2 11 1 1 Frequency error 11 1 1 1 Definition The frequency error of the transmitter is the difference between the measured carrier frequency in the absence of modulation of the transmitter and its required frequency 11 1 1 2 Method of measurement a The carrier frequency shall be measured in the absence of modulation b Tests shall be performed on the lowest operating frequency on which the EUT can transmit according to the manufacturer s specification and AIS 2 162 025 MHz c The measurement shall be made under normal and extreme test conditions 11 1 1 3 Required results The frequency error shall not exceed 0 5 kHz under normal and 1 kHz under extreme test conditions 11 1 2 Ca
120. ec ITU R M 1371 3 89 4 3 3 7 Use of safety related message Message 14 optional The data contents of Message 14 if implemented should be predefined and the transmission should not exceed one time period Table 40 specifies the maximum number of data bits used for Message 14 and is based on the assumption that the theoretical maximum of stuffing bits will be needed TABLE 40 Number of data bits for use with Message 14 Number of time Maximum data bits Stuffing bits Total buffer bits periods 1 136 36 56 The Class B CS AIS should only accept the initiation of a Message 14 once a minute by a user manual input Automatic repetition is not allowed The Message 14 may have precedence over Message 18 4 4 Network layer The network layer should be used for establishing and maintaining channel connections management of priority assignments of messages distribution of transmission packets between channels data link congestion resolution 4 4 1 Dual channel operation The normal default mode of operation should be a two channel operating mode where the AIS simultaneously receives on both channels A and B in parallel The DSC process may use the receiving resources on a time share basis as described in 4 6 Outside the DSC receiving periods the two TDMA receiving processes should work independently and simultaneously on channels A and B For periodic repeated messages the transmission
121. ed above is shown in Figure 10 dBc 80 62 5 0 62 5 IEC 267 06 Figure 10 Emission mask 83 62287 1 IEC 2006 E 57 11 1 4 Modulation accuracy 11 1 4 1 Definition The modulation accuracy is the measurement of the peak frequency deviation of the transmitter modulation and the correct implementation of the GMSK BT filtering 11 1 4 2 Method of measurement Configuration A Transmitter RF signal under test analyser i i i H i H Te H Trigger device a Configuration B Power Test Storage attenuator discriminator oscilloscope Transmitter under test IEC 26806 Figure 11 Measurement arrangement for modulation accuracy The measurement procedure shall be as follows a the equipment shall be connected in either configuration A or configuration B as shown The trigger device is optional if the equipment is capable of synchronising to the transmitted bursts b the transmitter shall be tuned to AIS 2 162 025 MHz c the transmitter shall be modulated with test signal number 2 d the deviation from the carrier frequency shall be measured as a function of time e the transmitter shall be modulated with test signal number 3 f the deviation from the carrier frequency shall be measured as a function of time g measurements shall be repeated at the lowest frequency on which the EUT can transmit according to the manufacturer
122. entering Step A to B or leaving Step C to D a transitional zone the Class B CS AIS should continue to evaluate the CS threshold taking into account the noise level of the old channel initially and the new channel as time progresses It should continuously transmit on frequency 1 and frequency 3 in Step B with the required rate maintaining its schedule 4 4 3 Distribution of transmission packets 4 4 3 1 A competent authority may assign reporting intervals to any mobile station by transmitting group assignment Message 23 An assigned reporting interval should have precedence over the nominal reporting rate a reporting interval of less than 5 s is not required Assigned reporting intervals The Class B CS should react on next shorter next longer commands only once until time out 4 4 4 Data link congestion resolution The Class B CS AIS access algorithm as described in 4 3 3 1 guarantees that the time period intended for transmission does not interfere with transmissions made by stations complying with Annex 2 Additional congestion resolution methods are not required and should not be used 4 5 The transport layer should be responsible for Transport layer converting data into transmission packets of correct size sequencing of data packets interfacing protocol to upper layers 4 5 1 A transmission packet is an internal representation of some information which can ultimately be communicated t
123. fil 8002123456 P1 80 P2 02 P3 12 P4 34 P5 56 6 E RE 1 10000 N S EW 0 3 9 1 90 00 00005 lt 90 00 0000N 180 00 0000W lt 180 00 0000E 2 L1 10 NE 0 NW 1 SE 2 SW 3 9 Li 1 10 L2 10 REOR 1 L2 1 10 L3 10 1 L3 1 0 1 L4 10 0 01 L4 1 0 001 L5 10 0 0001 L5 1 100 51 L6 10 10 L6 1 1 L7 10 10 L7 1 1 L8 10 0 1 L8 1 0 01 L9 10
124. fset specified in Message 15 the response should be transmitted within 30 s using the access algorithm as described in 4 3 3 2 If no free candidate period has been found one transmission retry should be performed after 30 s If interrogated by a base station with an offset given in Message 15 the response should be transmitted in the specified time period without applying the access algorithm as described in 4 3 3 2 An interrogation for Message 19 should only be responded to if the interrogation Message 15 contains an offset to the time period in which the response should be transmitted Interrogations for the same message received before own response has been transmitted may be ignored 7 Because of the time out assignments may be reissued by the competent authority as needed If a Message 23 commanding a reporting interval of 6 or 10 min is not refreshed by the base station the assigned station will resume normal operation after time out and thus not establish the assigned rate 8 This can only be done by a base station The base station will reserve time periods by Message 20 prior to interrogation 76 Rec ITU R M 1371 3 87 4 3 3 4 Initialization At power on a station should monitor the TDMA channels for one 1 minute to synchronize on received VDL transmissions 4 3 1 1 and to determine the CS detection threshold level 4 3 1 3 The first autonomous transmission should always be the scheduled position rep
125. g sequence The training sequence should be a bit pattern consisting of alternating 0 s and 1 s 010101010 Twenty four bits of preamble are transmitted prior to sending the flag This bit pattern is modified due to the NRZI mode used by the communication circuit See Fig 39 FIGURE 39 Training sequence a Unmodified bit pattern b Modified bit pattern by NRZI 1371 39 82 Rec ITU R M 1371 3 4 3 2 2 5 Start flag The start flag should be 8 bits long and consists of a standard HDLC flag It is used to detect the start of a transmission packet The