Underwater acoustic communication method based on virtual time reversal mirror M element bionic signal coding

A technology of virtual time reversal and signal encoding, applied in electrical components, ultrasonic/sonic/infrasonic transmission systems, transmission systems, etc., to achieve good communication concealment, enhanced multi-path resistance, and strong communication concealment effects

Inactive Publication Date: 2013-11-20
HARBIN ENG UNIV
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Problems solved by technology

At present, there are few studies on the application of dolphi

Method used

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  • Underwater acoustic communication method based on virtual time reversal mirror M element bionic signal coding
  • Underwater acoustic communication method based on virtual time reversal mirror M element bionic signal coding
  • Underwater acoustic communication method based on virtual time reversal mirror M element bionic signal coding

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Embodiment Construction

[0026] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0027] combine Figure 8 , the technical solution of the present invention comprises the following steps.

[0028] On the transmitter side:

[0029] (1) Serial-to-parallel conversion of the binary information bit stream;

[0030] (2) Select a dolphin Whistles signal output through the signal code selector;

[0031] (3) Add a synchronization code before encoding the signal to generate a frame signal, and the synchronization code uses a section of Whistles signal;

[0032] (4) After the frame signal is amplified by power, it is transmitted through the transducer.

[0033] On the receiving end:

[0034] (1) Firstly, channel equalization is performed on the signal received by the hydrophone, and the channel equalization adopts virtual time reversal mirror technology;

[0035] (2) Synchronize the signal after channel equalization to determine the time base at whi...

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Abstract

The invention provides an underwater acoustic communication method based on virtual time reversal mirror M element bionic signal coding. The method comprises the steps that (1) binary information bit streams are subjected to serial-parallel conversion; (2) a dolphin whistles signal is selected for output through a signal code selector; (3) synchronous codes are added before coding signals, and one frame signal is generated; (4) the frame signal is subjected to power amplification and is transmitted out by an energy converter; (5) signals received by a hydrophone are firstly subjected to channel equalization; (6) the signals subjected to the channel equalization are synchronized for determining the signal start time base, and in addition, the coding signals are intercepted through the time base; (7) the coding signals are sent into M replica correlators, and the decoding is carried out according to the maximum value of output results of the correlators; and (8) the information is subjected to parallel-serial conversion and reduction, and sequences are sent. The underwater acoustic communication method has the advantages that the gain processing and anti-multipath capability is higher, bionic signals cannot be easily intercepted, and good communication concealment is realized; and the underwater acoustic communication method is particularly suitable for platforms with higher communication concealment requirements.

Description

technical field [0001] The invention relates to an underwater acoustic communication method, more precisely, an underwater acoustic communication method based on virtual time-reversal mirror M-element bionic signal coding. Background technique [0002] With the development of modern detection technology, the requirements for concealment of underwater acoustic communication are constantly increasing. Bionics is a method that can be used for concealed underwater acoustic communication. Different from simply reducing the signal-to-noise ratio, bionics uses signals that naturally exist in the underwater acoustic environment as modulation waveforms. Such signals can be sent by marine mammals such as dolphins and whales. sound. At present, there are few studies on the application of dolphin Whistles signals to underwater acoustic communication coding. [0003] M-ary spread spectrum communication uses a spread spectrum code sequence selector to map multiple information bits into ...

Claims

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Application Information

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IPC IPC(8): H04B13/02H04B11/00
Inventor 殷敬伟韩笑杜鹏宇张晓
Owner HARBIN ENG UNIV
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