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Frame header detection method and frame header detector for asm signal in vhf data exchange system

A technology of data exchange and detection method, applied in the direction of digital transmission system, transmission system, device dedicated to receiver, etc., can solve the problem of not participating in communication, unable to know the time modulation and coding method of ship sending ASM signal, etc.

Active Publication Date: 2021-08-10
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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  • Frame header detection method and frame header detector for asm signal in vhf data exchange system
  • Frame header detection method and frame header detector for asm signal in vhf data exchange system
  • Frame header detection method and frame header detector for asm signal in vhf 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] like 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 sign...

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Abstract

The invention provides a method for detecting the frame header of an ASM signal in a VHF data exchange system and a frame header detector, comprising: preprocessing the received signal; using the preprocessed signal to perform a single ASM signal frame header detection; according to the frame header structure The feature performs continuous ASM signal frame header detection. The invention has the technical characteristics of constant false alarm detection, and is beneficial to the reconnaissance of air non-coordinated communication ASM signals.

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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Patent Type & Authority Patents(China)
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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