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A camouflaged communication signal recognition method based on time delay difference coding imitating cetacean calls

A time-delay difference coding and recognition method technology, applied in speech recognition, speech analysis, instruments, etc., can solve the problems that the parameters and characteristics of bionic covert communication signals cannot be determined, and it is difficult to distinguish bionic covert communication signals

Active Publication Date: 2022-07-19
TIANJIN UNIV
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Problems solved by technology

Therefore, using the traditional signal recognition method, without knowing the cetacean sound database used by the enemy, it is impossible to determine the specific parameters and characteristics of the bionic covert communication signal, and it is difficult to distinguish between real cetacean calls and fake cetacean calls. Biomimetic Covert Communication Signals of Animal Sounds

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  • A camouflaged communication signal recognition method based on time delay difference coding imitating cetacean calls
  • A camouflaged communication signal recognition method based on time delay difference coding imitating cetacean calls
  • A camouflaged communication signal recognition method based on time delay difference coding imitating cetacean calls

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[0052] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0053] The purpose of the present invention is to provide a camouflaged communication signal identification method based on time-delay difference coding that imitates cetacean calls, which can locate the center point position of click / whistle call pulses in the cetacean sound signal through a double-threshold endpoint detection algorithm, and calculate the call The delay difference between the sound pulses and the probability density function distribution of the delay difference are calculated to identify the delay difference encoding bionic covert communication underwater acoustic signal that distinguishes the real whale sound signal and the camouflaged cetacean call.

[0054] Th...

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Abstract

The invention discloses a method for identifying a camouflaged communication signal based on time-delay difference coding imitating cetacean calls. The start point and end point of the signal call pulse; and calculate the center position of the call pulse; (2) Calculate the difference between the time points corresponding to the center points of each two adjacent call pulses to obtain the center points of two adjacent call pulses (3) Arrange all the obtained delay differences in ascending order, and calculate the probability density function of the delay difference; (4) Delineate the dense distribution area of ​​the time delay; (5) Statistics The delay difference probability density and P in the dense distribution area of ​​delay difference a , set the probability density threshold P T , if P a <P T It is recognized as a real whale sound signal; if P a >P T Then it is determined that it is a time-delay difference encoded bionic covert communication signal.

Description

technical field [0001] The invention belongs to the field of underwater acoustic signal processing, in particular to a method for identifying a camouflaged communication signal imitating cetacean calls based on time delay difference coding. Background technique [0002] In 2001, the U.S. Naval Research Office was inspired by the camouflage of many creatures in nature, and put forward a new concept of bionic covert communication in its annual technical report. The core idea is to use or imitate the ocean through bionic technology. The cetacean calls that widely exist in China are used as communication signals to deceive the enemy, making it filter out the real communication signal as the noise of marine animals produced by cetaceans, so as to camouflage itself. Realize the concealment of communication. As a covert underwater acoustic communication technology with great potential, bionic covert communication technology has become a new research trend in recent years, and is a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L17/26G10L15/04G10L19/20G10L21/0308G10L25/45
CPCG10L17/26G10L15/04G10L19/20G10L21/0308G10L25/45
Inventor 蒋佳佳苗宇段发阶傅骁王宪全李春月孙中波崔锦东乔飞
Owner TIANJIN UNIV
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