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海事の国際的動向に関する調査研究事業報告書(海上安全) 別冊 AISの国際的動向に関する調査研究

 事業名 海事の国際的動向に関する調査研究
 団体名 日本海難防止協会 注目度注目度5


別添4
St. Lawrence Seaway AIS Data Messaging
Formats and Specifications
Harmonized with U.S. Coast Guard PAWSS
AIS Messages
Revision 4.0A
May 9, 2002
 
Developed for the:
Saint Lawrence Seaway Development Corporation
Saint Lawrence Seaway Management Corporation
 
By:
U.S. Department of Transportation
John A. Volpe Transportation systems center
55 Broadway
Cambridge, MA 02142 別添4
 
Revision History
Document Version Description
1.0 (all versions) Internal draft, Not publicly released
2.0 (all versions) Internal draft, Not publicly released
3.0 (all versions) Initial draft release, Seaway specific messages
4.0 (April 25, 2002) Revised all messages to harmonize with USCG PAWSS AIS messages
4.0A (May 9, 2002) Corrections:
Page 6, changed text to read "If there is more than six station readings,・・・
Section 7, Page 15, Main table - corrected bit count on table
Section 7.2, Page 16, Example - corrected Function ID in example
Section 8.1 , Page 18, Example - Corrected Function ID in Example
Section 9, Page 19, put the two reserved bits between App ID and Function ID
Section 12, Page 21 , Hydro message - corrected spare bit count from 14 to 16
Section 12. Page 23, Revised Vessel Procession Order Message 2
 
1 Introduction
1.1 Message Structure
 
 All Saint Lawrence Seaway AIS messages defined in this specification (except for the safety related text messages in Section 10) are transmitted as either Broadcast or Addressed Binary messages. The message data formats defined in the following sections make up the "binary data" parameter of ITU-R M.1371 messages 6 and 8. A description of the proposed AIS sentence formats used to interface to the AIS transponder presentation port is found in Annex B of IEC 61993-2 or IEC PAS 6112-100.
 
 Messages transmitted within the border of the United States shall have a Designated Area Code (DAC) of 366. A DAC of 316 shall be used for transmissions that originate within the border of Canada.
 
 Except for the safety related messages, as discussed in Section 10, the Function Identifier (FI) for all transmitted Seaway messages shall be:
 
Function Message Type Function Identifier (FI)
Metrological and Hydrological 1
Vessel/Lock Scheduling 2
Seaway Specific Messages 32
 
 Individual message types shall be identified by the Message ID field following the Application Identifier.
 
1.2 Broadcast Intervals
 
 Each individual Seaway message has an assigned update interval established by the Seaway Traffic Management System (TMS). However, the AIS network may elect to retransmit any messages, system resources permitting, at more frequent intervals.
 
1.3 Location Fields
 
 All binary messages include a location field (latitude and longitude in WGS-84 datum). The position designates the general or specific area for which the message data is applicable. For example, weather information messages specify the location of the actual weather sensor used as the data source. The position field for some message types may define an arbitrary point in the vicinity of the applicable area. For example, a lockage order message will include a latitude and longitude near the lock, but not necessary at center of the lock chamber.
 
 The location fields are intended to provide a reference point for the data in the messages so that the information may be represented geographically with appropriate symbology. How this data is represented on electronic chart display systems is left to the discretion of the developers (at least until an agreed upon standard is developed for "marine information object" display).
 
2 Common Message Fields
 The following message fields are commonly found in more than one Seaway messages.
 
2.1 Application Identifier
 
Parameter Number of bits Description
Designated Area Code 10 The Designated Area Code will be 366 for the United States or 316 for Canada depending on the location of transmitter. Refer to Section 1.1 for description
Function Identifier 6 Function Identifier, See Section 1.1
Total number of bits 16  
 
2.2 UTC Time
 
Parameter Number of bits Description
Month 4 Month of year (01 - 12 Month); 0 = not available; 13-15 not used
Day 5 Day of month (01 - 31 Days); 0 = not available
Hours 5 UTC Hours (0-23), 24 = not available, 25-31 not used
Minutes 6 UTC Minutes (0-59), 60 = not available, 61-63 not used
Total number of bits 20  
 
 All time-referenced information, including month, day and time of sensor reading observations, will be expressed in Coordinated Universal Time (UTC).
 
Example: May 29, 12:34AM
 
Month Day Hour Minute
0 1 0 1 1 1 1 0 1 0 0 0 0 0 1 0 0 0 1 0
5 29 00 34







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更新日: 2019年6月8日

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