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A multi-carrier underwater acoustic communication method suitable for deep sea channels

An underwater acoustic communication and multi-carrier technology, which is applied in the modulation carrier system, multi-frequency code system, transmission monitoring, etc., can solve the problem of low transmission rate

Inactive Publication Date: 2021-05-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct sequence spread spectrum technology has strong anti-interference performance, but its transmission rate is low

Method used

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  • A multi-carrier underwater acoustic communication method suitable for deep sea channels
  • A multi-carrier underwater acoustic communication method suitable for deep sea channels
  • A multi-carrier underwater acoustic communication method suitable for deep sea channels

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Experimental program
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Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0058] Step 1: In the present invention, the ocean is divided into a surface isothermal layer, a thermocline and a deep-sea isothermal layer, the surface isothermal layer and the deep-sea isothermal layer are positive sonic gradient water layers, and the thermocline is a negative sonic gradient water layer, wherein the surface isothermal The layer is the depth of 0-100 meters in the ocean, the thermocline is the depth of 100-300 meters, and the deep-sea isothermal layer is the depth below 300 meters. The sea depth is taken as H, and the sound source is placed at the depth h. The change of H, the negative gradient of sound velocity and the positive gradient of sound velocity on the upper and lower sides of the channel axis respectively, the horizontal transmission distance is s, the track of the sound ray bends when propagating, the sound ray path only tr...

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Abstract

The invention provides a multi-carrier underwater acoustic communication method suitable for deep-sea channels, and relates to the field of underwater acoustic communication. The invention calculates the amplitude attenuation coefficient caused by wave front expansion and the amplitude caused by sound absorption when sound waves propagate in the ocean Attenuation coefficient and other parameters, establish a two-path channel model for transmission in the convergence area, and use this model to carry out communication simulation; the deep sea acoustic channel two-path model established by the present invention not only simplifies the channel model, but also can truly reflect the characteristics of the underwater acoustic channel Characteristics, through MC‑DS‑CDMA system simulation, the experimental results show that in the harsh underwater acoustic channel environment, the system has good characteristics, can achieve relatively robust communication, the system transmission efficiency is high, and the bit error rate meets the actual engineering application needs and can be applied in practice.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an underwater acoustic communication method suitable for deep sea channels. Background technique [0002] As the development of marine resources has received more and more attention from governments in recent years, the application demand for underwater acoustic communication has continued to increase. The attenuation of high-frequency signals by the ocean medium is serious, resulting in a narrow transmission bandwidth; the transmission speed of sound waves in the ocean is slow, and the relative movement of the transceiver leads to a large Doppler frequency deviation of the received signal. The complex and changeable marine environment leads to the characteristics of time-varying, space-varying, strong multipath interference, Doppler and other characteristics of underwater acoustic channels. All of these have brought great challenges to underwater communication d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B13/02H04L27/26H04B17/391H04B1/707
CPCH04B1/707H04B13/02H04L27/2601H04B17/3912
Inventor 樊养余展海玲吕国云王剑书王敏庆刘洋王菲
Owner NORTHWESTERN POLYTECHNICAL UNIV
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