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A method and device for underwater acoustic communication

A technology of underwater acoustic communication and useful signals, which is applied in the field of underwater acoustic communication, can solve problems such as the multipath effect of underwater acoustic signal environment complexity, and achieve the effect of improving transmission efficiency

Active Publication Date: 2022-02-25
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an underwater acoustic communication method and its device, which aims to solve the technical problem that the underwater acoustic signal is affected by the complexity of the environment and the multipath effect when propagating in the ocean

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  • A method and device for underwater acoustic communication
  • A method and device for underwater acoustic communication
  • A method and device for underwater acoustic communication

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Embodiment 1

[0023] figure 1 The implementation process of the underwater acoustic communication method provided by Embodiment 1 of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0024] Among them, QPSK is Quadrature Phase Shift Keying; FPGA is Field Programmable Logic Gate Array; SIMO is Single Input Multiple Output (Single Input Multiple Output); OFDM is Orthogonal Frequency Division Multiplexing; BPSK is Binary Phase Shift Keying (Binary Phase Shift Keying) ); LMF is a linear frequency modulation signal (Linear Frequency Modulation); ARM is an embedded microprocessor system; FRFT is a fractional Fourier transform; the IQ modulator is a quadrature carrier modulator;

[0025] like figure 1 , 3 Shown, a kind of underwater acoustic communication method, the data packet frame structure in the communication transmission of this method comprises: preamble, synch...

Embodiment 2

[0061] figure 2 A schematic structural diagram of the underwater acoustic communication device provided by Embodiment 1 of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0062] like figure 2 , 3 As shown, an underwater acoustic communication device, the data packet frame structure in the communication transmission of the device includes: a preamble, a synchronization code and a data code; a guard interval is set between the preamble and the synchronization code; the The preamble is used as the basis for the receiving end to judge the arrival of the useful signal and prepare to receive data; the synchronization code uses a chirp signal with the same modulation frequency as the data code and a different center frequency as the useful signal arrival time T0 and received in the fractional domain. a synchronous detection signal of an optimum order ...

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Abstract

The present invention relates to an underwater acoustic communication method and its device. The data packet frame structure in the communication transmission includes: a preamble, a synchronization code and a data code; a guard interval is set between the preamble and the synchronization code; the The method utilizes the different impact response environments of linear frequency modulation signals in different frequency bands, and obtains the mapping relationship corresponding to the characteristics of the impulse response in the frequency bands. Four groups of LMF signals with different center frequencies and the same modulation frequency are represented by quadrature phase shift keying (QPSK) modulation. Different symbols are used for signal transmission, and the carrier signal of each center frequency can represent two bits of binary information to improve transmission efficiency; its underwater acoustic communication device also has the above-mentioned technical effects.

Description

technical field [0001] The invention relates to a method for underwater acoustic communication, in particular to a method for multi-node data communication in a SIMO underwater acoustic channel. Background technique [0002] In seawater, due to the serious absorption and attenuation of electromagnetic waves and light waves propagating in water, sound waves are currently the main way of propagating in water. The propagation of sound waves in seawater will have a large attenuation due to various factors, and the underwater acoustic channel is complex and changeable. , with the Doppler shift effect. In underwater acoustic communication, due to the influence of the reflection and refraction of sound waves on the water surface and bottom, it often causes multipath effects at the receiving end. In addition, when realizing high-speed communication, the limited channel bandwidth and multi-channel transmission of signals will cause very serious intersymbol interference, resulting in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B13/02H04L1/00H04L27/20
CPCH04B13/02H04L1/0009H04L27/20Y02D30/70H04B11/00H04L5/0048H04L27/22H04L27/2602H04L27/2634H04L27/103H04L27/2639H04L27/0014H04L27/2605
Inventor 胡耀星赵春蕾徐锡强
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI