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Link access method for AIS (Automatic Identification System) Class B shipborne responder

An access method and link technology, applied in the information field, can solve problems such as limited flexibility in sending messages, achieve the effects of enhancing practical value, meeting communication needs, and enhancing flexibility

Active Publication Date: 2013-10-02
CHENGDUSCEON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming that the current AIS Class B "CS" shipborne transponder adopts the link access scheme of CSTDMA to cause the flexibility of sending messages to be limited, and to provide a link of AIS Class B shipborne transponder access method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] This example adopts the link access method of the AIS Class B shipborne transponder described in the present invention.

[0028] First, the system is turned on and silent for at least one minute, receives messages from external ships, and establishes a time slot table, and then keeps the real-time update of the time slot table according to the received messages. The time slot table includes the attributes of the own ship's time slot table and the time slot table of external ships At this time, because the ship's AIS Class B onboard transponder is silent, only the time slot table attributes of external ships are in the time slot table at this time. When the ship is about to start sending periodic messages or random messages, add The time slot table attribute of the own ship, and then judge whether to send periodic messages, if it is necessary to send periodic messages, use CSTDMA link access technology, and determine the start time of each transmission cycle of the ship a...

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PUM

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Abstract

The invention relates to an information technology. The invention aims at solving the problem that message sending flexibility is limited because the existing AIS (Automatic Identification System) Class B 'CS (client-server)' shipborne responder adopts a CSTDMA (Carrier Sense Time Division Multiple Access) link access scheme. The invention provides a link access method for an AIS Class B shipborne responder, wherein the technical scheme of the invention is as follows: an RATDMA (Random Access Time Division Multiple Access) link access technology and a CSTDMA link access technology are combined in the AIS Class B 'CS' shipborne responder. The method has the beneficial effect that the flexibility of the equipment in practical application is enhanced, and the method is suitable for AIS Class B 'CS' shipborne responder systems.

Description

technical field [0001] The invention relates to information technology, in particular to the technology of AIS shipborne transponder. Background technique [0002] AIS (Automatic Identification System, ship automatic identification system) is a new type of navigation aid system and equipment, which can be used for communication and auxiliary navigation systems between shore ships or ship-shore or ship-to-ship for communication and command of water traffic. It provides a new and effective means for ship navigation safety and navigation management. It is based on the relevant monitoring technology of radio transponders, which can be used for precise tracking of ships and other vehicles, so as to make up for the traditional radar monitoring in automatically identifying targets and obtaining navigation trends. Insufficient information and other aspects can assist or replace radar monitoring. Due to the advanced nature of AIS technology, ease of use and economy, AIS technology ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
Inventor 周密谢永锋
Owner CHENGDUSCEON TECH
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