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ASM signal frame header detection method and frame header detector for very high frequency data exchange system

A technology of data exchange and detection method, applied in the direction of digital transmission system, transmission system, electrical components, etc., which can solve the problems of not participating in communication and being unable to know the time modulation and coding method of the ASM signal sent by the ship

Active Publication Date: 2019-10-29
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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Problems solved by technology

[0005] 2) The UAV is only for reconnaissance and does not participate in the communication in the self-organizing time division multiplexing area, so it is impossible to know the time when each ship sends the ASM signal and the corresponding modulation and coding method

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  • ASM signal frame header detection method and frame header detector for very high frequency data exchange system
  • ASM signal frame header detection method and frame header detector for very high frequency data exchange system
  • ASM signal frame header detection method and frame header detector for very high frequency data exchange system

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[0045] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] Such as figure 1 As shown, the present invention provides a kind of very high frequency data exchange system ASM (Application Specific Message) signal frame header detection method, comprising:

[0047] Step S1, preprocessing the received signal: firstly, determine the truncated length of the received signal according to the frame header structure characteristics of the ASM signal, and then determine that the length of the local modulation compensation signal is the same as the truncated length of the received signal according to the modulation characteristics of the ASM signal, and Multiply the intercepted signal intercepted according to the interception length of the received signal and the local modulation compensation s...

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Abstract

The invention provides an ASM signal frame header detection method and a frame header detector for a very high frequency data exchange system. The ASM signal frame header detection method comprises the following steps: preprocessing a received signal; carrying out single ASM signal frame header detection by utilizing the pre-processed signal; and carrying out continuous ASM signal frame header detection according to the frame header structure characteristics. The method has the technical characteristic of constant false alarm rate detection, and is beneficial to air non-coordinated communication ASM signal reconnaissance.

Description

technical field [0001] The invention relates to a method for detecting a frame header of an ASM signal in a VHF data exchange system and a frame header detector. Background technique [0002] With the great success of the application of the automatic identification system (AIS) and the continuous development of AIS functions, the network load of AIS is getting bigger and bigger, which damages the original concept of collision avoidance of AIS. In order to ensure the performance of AIS, the WP5B group of the International Telecommunication Union and the E-NAV group of the International Association of Navigational Aids and Aids to Navigation Aids held a meeting to discuss the technical solutions and development directions of the next-generation AIS—Very High Frequency Data Exchange System (VDES). On the basis of guaranteeing the highest priority of AIS, organizations such as the International Maritime Organization and the International Telecommunication Union separate the Appl...

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Application Information

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IPC IPC(8): H04L1/00H04L29/06H04L29/08
CPCH04L1/0036H04L67/12H04L69/06
Inventor 周昊苏刘柳周雷郭颖林博鑫
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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