An improved method for optimal selection of candidate time slots in ais systems

Abstract

The invention belongs to the technical field of information processing. It is realized by AIS protocol stack terminal equipment, which is composed of AIS protocol stack core processor, external AIS time slot selection parameter input interface module and AIS radio frequency transceiver module, and the power supply module provides power for AIS protocol stack terminal equipment. Wherein, the external AIS time slot selection parameter input interface module receives parameter data of various message packages and message lengths to determine and influence time slot selection parameters. The core processor of the AIS protocol stack is the key of the present invention, which executes the improved time slot selection model and algorithm designed by the present invention, and performs AIS message encapsulation. The AIS radio frequency mode transceiver module is responsible for establishing the AIS VDL (VHF Data Link—VHF? Data? Link) link to exchange information with other AIS terminal equipment.

Description

technical field [0001] The invention relates to a method for optimally selecting a candidate time slot of an AIS system, in particular to an improved method for optimally selecting a candidate time slot for an AIS system; it belongs to the technical field of information processing. Background technique [0002] In the international AIS (ship automatic identification system - Automatic Identification System) technical standard, it is stipulated that the AIS channel is divided into 2250 channels per minute on the 87B (161.975MHz) and 88B (162.025MHz) dedicated maritime VHF (Very High Frequency) channels. Time slots, using the TDMA (Time Division Multiple Access - TimeDivisionMultipleAccess) communication system to exchange and identify digital information between ships to achieve the purpose of collision avoidance. In order to enable all kinds of terminal equipment to independently form a network on the above channels to realize the mutual exchange of information, the internat...

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Problems solved by technology

However, when using the above algorithm to select the initial candidate time slots, the number of consecutive candidate time slots is designed to be gradually scanned from ≥ 4 until the required candidate time slots are obtained; this not only wastes a lot of time for scanning and selection, but also the selected candidate time slots may Wasteful, since most AIS messages are single-slot messages

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