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A method of concealed underwater acoustic communication imitating whale calls based on adaptive interference cancellation

A technology for interference cancellation and underwater acoustic communication, which is applied in ultrasonic/acoustic/infrasonic transmission systems, transmission noise suppression, electrical components, etc., can solve the problems of lack of safety and concealment, and achieve concealment and safety. The effect of high reliability and improved concealment

Active Publication Date: 2018-05-18
HARBIN ENG UNIV
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Problems solved by technology

[0002] The traditional concealed underwater acoustic communication method is to introduce the communication signal into the underwater acoustic environment in the form of "noise", but this method has certain shortcomings, that is, passive sonar can still detect this "noise" by using long-time integration detection. Noise", so this method does not have absolute security and concealment

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  • A method of concealed underwater acoustic communication imitating whale calls based on adaptive interference cancellation
  • A method of concealed underwater acoustic communication imitating whale calls based on adaptive interference cancellation
  • A method of concealed underwater acoustic communication imitating whale calls based on adaptive interference cancellation

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Embodiment Construction

[0051] The present invention will be further described below with reference to the accompanying drawings.

[0052] The invention discloses a concealed underwater acoustic communication method based on self-adaptive interference cancellation. From the perspective of bionic camouflage, the present invention utilizes the auditory masking effect of human ears to realize concealed communication. At the transmitting end, the source information is modulated into a direct sequence spread spectrum signal, and mixed with the real whale call signal to form a bionic communication signal, which is sent to the underwater acoustic channel. Among them, the whale's call signal is not only used as the synchronization signal in the communication signal, but also as the masking signal of the spread spectrum signal. At the receiving end, the adaptive interference cancellation method is used to separate the whale call signal and the spread spectrum signal in the time domain. Starting from the per...

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Abstract

The invention belongs to the technical field of underwater sound communication and particularly relates to a whale-sound-imitating covert underwater sound communication method based on self-adaptive interference cancellation. The method comprises steps as follows: a proper whale sound signal is selected, the time frequency characteristic of the whale sound signal is analyzed, and a proper time frequency interval is selected for spread spectrum signal concealment; digital information source information is modulated into a direct sequence spread spectrum signal, and the frequency range of the spread spectrum signal is required to be within the frequency band range of the whale sound signal; the spread frequency signal produced in step (2) and the whale sound signal selected in step (1) are summed up to form a bionic communication signal and the like. The whale-sound-imitating covert underwater sound communication method based on self-adaptive interference cancellation is simple, easy to implement, high in reliability and capable of guaranteeing the covert property and safety of communication information and well meeting the requirement of a covert underwater sound communication system.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to a concealed underwater acoustic communication method based on adaptive interference cancellation for imitating whale calls. Background technique [0002] The traditional covert underwater acoustic communication method is to introduce the communication signal into the underwater acoustic environment in the form of "noise", but this method has certain shortcomings, that is, passive sonar can still detect this kind of "noise" using long-term integral detection. noise”, so this method does not have absolute security and concealment. In order to improve the concealment of the traditional concealment method, the present invention hides the spread spectrum signal of the low sound source level in the appropriate time-frequency distribution interval of the whale call signal of the high sound source level from the perspective of the human auditory mask...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B11/00H04B13/02H04B15/00
CPCH04B11/00H04B13/02H04B15/00
Inventor 刘凇佐乔钢马天龙王梦佳聂东虎马璐尹艳玲周锋孙宗鑫
Owner HARBIN ENG UNIV
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