DIN EN 62320-3-2015 Maritime navigation and radiocommunication equipment and systems - Automatic identification systems (AIS) - Part 3 Repeater stations - Minimum operational and p.pdf
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1、November 2015DEUTSCHE NORM DKE Deutsche Kommission Elektrotechnik Elektronik Informationstechnik in DIN und VDEDIN-Normenstelle Schiffs- und Meerestechnik (NSMT)Preisgruppe 36DIN Deutsches Institut fr Normung e. V. Jede Art der Vervielfltigung, auch auszugsweise, nur mit Genehmigung des DIN Deutsche
2、s Institut fr Normung e. V., Berlin, gestattet.ICS 47.020.70!%Cw1 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. When insufficient free
3、slots are available, and there are slots that contain energy levels that exceed a free slot without a decodable message, then they shall be considered “garbled slots”. The algorithm shall then select “garbled slots” according to the lowest energy level first. Intentional slot reuse, in accordance wi
4、th Recommendation ITU-R M.1371 shall be performed after free and “garbled slots” are exhausted. 4.4 Message scheduling (See 6.6) 22 DIN EN 62320-3:2015-11 EN 62320-3:2015 4.4.1 Station report A repeater station has to identify itself by transmitting a repeater status report using Message 26 every 6
5、min by default (value shall be configurable within 60 min), alternating between channel A and B. The access scheme shall preferably be ITDMA or SOTDMA where possible. FATDMA or RATDMA may be used, depending on the reporting interval. If the access scheme is configured as depending on the reporting i
6、nterval the following access scheme shall be used: 1 min and 7 min: RATDMA In all cases FATDMA slots shall be used, if available. If the repeater station is not programmed with a valid identifier (MMSI) or is not configured to transmit a repeater status report then all repeating functions shall be d
7、isabled. If the repeater station is configured to disable all repeating functions, the repeater status report transmission is not required. If the repeater station is integrated into a base station or an AIS AtoN station, the repeater station shall have its own MMSI in accordance with Recommendation
8、 ITU-R M.585. 4.4.2 Repeater station identification message structure Table 6 defines the contents of the Message 26 which identifies the repeater station on the VDL. If the repeater station is built into a base station or an AIS AtoN, this message transmission is also required. 23 DIN EN 62320-3:20
9、15-11 EN 62320-3:2015 Table 6 Contents of Message 26 used for repeater station identification Parameter Number of bits Description Message ID 6 Always 26 Repeat indicator 2 Always 0 Source ID 30 The ID shall be as defined in 4.4.1 Destination indicator 1 Always 0 = Broadcast Binary data flag 1 Alway
10、s 1 = Structured message Application identifier 16 DAC = 995, FI = 0 Longitude 28 Longitude in 1/10 000 min (180, East = positive (as per 2s complement), West = negative (as per 2s complement); 181= (6791AC0h) = not available = default) Latitude 27 Latitude in 1/10 000 min (90, North = positive (as
11、per 2scomplement), South = negative (as per 2s complement); 91 = (3412140h) = not available = default) Alarm status 16 See Table 7 Messages repeated in last frame 9 0 to 400 messages Spare 12 Not used. Shall be set to zero. Reserved for future use. Communication state selector 1 0 = SOTDMA communica
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