Passive time reversal underwater sound communication method suitable for mobile platform

An underwater acoustic communication and mobile platform technology, applied in electrical components, transmission systems, etc., can solve problems such as the great impact on communication quality and the difficulty in obtaining low bit error performance, so as to improve the success rate of reception, enhance reliability, and reduce peak The effect of the ratio

Inactive Publication Date: 2011-04-20
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
View PDF3 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Literature 1 and Literature 2 study the passive time inverse spread spectrum communication method based on a single hydrophone. Invention 1 proposes an underwater space division multiple access scheme based on a single hydrophone’s passive time inverse processing. However, the theory and exp

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Passive time reversal underwater sound communication method suitable for mobile platform
  • Passive time reversal underwater sound communication method suitable for mobile platform
  • Passive time reversal underwater sound communication method suitable for mobile platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0029] 1. Transmission signal generation method

[0030] The transmission signal of the underwater acoustic communication system of the present invention includes two parts: the probe signal and the preprocessed spread spectrum signal. The probe signal has two functions, one is to enable the communication system to find the starting position of each frame signal at the receiving end, and to determine the Doppler spread ( compression) amount. In this technical field, a chirp signal or a hyperbolic FM signal is a commonly used form of synchronization signal. Second, the receiving end saves the received probe signal, and performs cross-correlation processing with the subsequently arriving information signal. The spread spectrum signal is the main part of the transmitted signal, which carries the information to be transmitted. The spread spectrum signal can be...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a passive time reversal underwater sound communication method suitable for a mobile platform, wherein at least a receiver or a sender moves, the same information frame is repeatedly emitted on different position points, and channel transfer functions on different position points have lower correlation. A receiving end carries out pretreatment, such as frame synchronization, time reversal convolution, Doppler correction and the like, to a received signal, then merges a plurality of pretreated signals received on different opposite positions, and recovers emission information by operations, such as symbol synchronization, spread spectrum sequence correlation and the like. The invention has the beneficial effects that level correlation of a underwater sound communication channel is weakened by using position changes to provide a space diversity effect for time reversal treatment; the configuration of the time reversal communication system is lowered, and for the minimum configuration, the receiving end and the sending end are needed to be provided with only one real object array element respectively. Meanwhile, the same information frame is repeatedly emitted at different time points to obtain the time diversity effect, thereby obviously improving the reliability of the underwater sound communication system in the complex environment.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, and mainly relates to a passive time-reverse underwater acoustic communication method suitable for a mobile platform. Background technique [0002] In the underwater acoustic channel, due to the influence of the interface (bottom, sea surface) reflection, the channel multi-channel extension is very serious, especially in shallow seas, the multi-channel extension may sometimes reach hundreds of milliseconds, and the inter-symbol interference generated by the multi-channel extension is underwater. One of the major obstacles to acoustic communication. [0003] Time reversal (referred to as time inversion) processing technology is an effective means developed in recent years to overcome inter-symbol interference caused by multi-path in underwater acoustic communication. According to the difference of hardware configuration and data flow direction, time reversal technology can be divi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B13/02
Inventor 张宏滔王忠康岳志杰祝献
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap