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Method and system for reducing AIS signal aliasing

A signal and aliasing technology, which is applied in the field of communication, can solve the problems that different subnetworks cannot be guaranteed to work together, and the probability of time slot conflicts at satellite receivers increases, so as to alleviate the problem of signal aliasing, reduce the probability of time slot conflicts, and improve The effect on system reliability

Inactive Publication Date: 2016-06-01
SPACE STAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Embodiments of the present invention provide a method for reducing AIS signal aliasing based on the self-organizing time division multiple access protocol, which is used to solve the problem that the spaceborne AIS will be able to act on more independent AIS subnets. In this case, the traditional self-organizing The time division multiple access protocol cannot guarantee the cooperative work between different subnets, which leads to the problem that the probability of time slot conflict at the satellite receiver increases

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  • Method and system for reducing AIS signal aliasing

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Embodiment 1

[0038] Embodiment 1 of the present invention provides a self-organizing time-division multiple access method that reduces the aliasing probability of spaceborne AIS signals. figure 1 As shown, the processing flow chart of the method for reducing AIS signal aliasing based on the self-organizing time division multiple access protocol provided by Embodiment 1 of the present invention is as follows figure 2 As shown, the following processing steps are included:

[0039] Step S11, the terminal obtains the respective time slot reservation tables of other terminals through the listening channel;

[0040] Step S12, the terminal updates its own time slot reservation table according to the acquired time slot reservation tables of other terminals;

[0041] Step S13, the terminal encapsulates the updated time slot reservation table and sends it to the channel.

Embodiment 2

[0043] This embodiment provides a method for reducing AIS signal aliasing based on the self-organizing time division multiple access protocol, and the processing flow is as follows image 3 As shown, the following processing steps are included:

[0044] Step S21, the time for the current terminal to monitor the channel for one superframe;

[0045] Before the current terminal enters the network, it first listens to the channel for one superframe time as the first superframe period;

[0046] Step S22, the terminal obtains the respective time slot reservation tables of other terminals through the listening channel;

[0047] The terminal listens to the channel to receive node messages from other terminals in one superframe period, extracts the control signaling of other terminals from the node messages, and obtains the time slot reservation table of other terminals from the control signaling of other terminals; or the terminal listens The channel receives node messages from othe...

Embodiment 3

[0066] This embodiment provides a system for reducing AIS signal aliasing based on the self-organizing time division multiple access protocol, and its specific implementation structure is as follows Figure 6 As shown, specifically, the following modules may be included: a time slot reservation table acquisition module 51, a time slot reservation table update module 52 and a sending module 53, wherein,

[0067] Time slot reservation table acquisition module 51: it is used to enable the terminal to obtain the respective time slot reservation tables of other terminals through the listening channel;

[0068] Further, the terminal listens to the channel for one superframe period to receive node messages from other terminals, extracts control signaling of other terminals from the node messages, and obtains the time slot reservation table of other terminals from the control signaling of other terminals; or The terminal listens to the channel to receive node messages from other termi...

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Abstract

The invention provides a method and system for reducing AIS signal aliasing based on S-TDMA protocol, and the method comprises the steps that a terminal obtains the time slot reservation table of each of other terminals through a detection channel; the terminal updates the time slot reservation table of the terminal according to the obtained time slot reservation tables of other terminals; and the terminal enables the updated time slot reservation table to be packaged and transmitted to a channel. The method makes the most of information resources in the system while the method does not increase the complexity of the system, so as to solve a problem of terminal exposure / hiding, thereby solving a problem of signal aliasing caused by the increase of the coverage of the satellite-borne AIS, reducing the time slot conflict probability, and improving the reliability of the system.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for reducing AIS signal aliasing based on an ad hoc time division multiple access protocol. Background technique [0002] AIS can use VHF wireless data link and self-organizing time division multiple access technology to periodically broadcast the ship's logo, position, etc. information about the ship. [0003] The self-organizing time division multiple access protocol SOTDMA (Self-Organized Time Division Multiple Access) technology can be understood as a communication technology in which multiple users can use the same channel to send information without interfering with each other according to the time division system. The channel time is divided into fixed data frames, and a data frame contains a certain number of time slots. In AIS, the time length of a frame is one minute, which is divided into 2250 time slots; each time slot is 26.67ms. Each ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185
Inventor 李妍杨博李长德王燕石云
Owner SPACE STAR TECH CO LTD