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A low-intercept underwater acoustic remote control method based on time-frequency extension

A time-frequency spreading, low-interception technology, applied in multi-frequency code systems, transmission systems, electrical components, etc., can solve the problems of difficult to find communication, difficult to decode correctly, unable to match processing, etc., to achieve low instantaneous power and spectral density, Effect of large processing gain, improved low intercept performance

Inactive Publication Date: 2015-09-30
三亚哈尔滨工程大学南海创新发展基地
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  • Application Information

AI Technical Summary

Problems solved by technology

For low instantaneous power signals, it is difficult for the intercept receiver to find the existence of communication, and under the premise of unknown system parameters, it cannot be matched and processed to obtain processing gain, and it is difficult to decode correctly

Method used

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  • A low-intercept underwater acoustic remote control method based on time-frequency extension
  • A low-intercept underwater acoustic remote control method based on time-frequency extension
  • A low-intercept underwater acoustic remote control method based on time-frequency extension

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Embodiment Construction

[0022] In order to verify the performance of the system using the low-intercept underwater acoustic remote control technology, the following simulation experiments are carried out: the transmission information code is 20bit, and two 31-bit m-sequences are selected as the time-spreading code and the spreading code.

[0023] Step 1: Time-spread modulation based on subcarrier modulation

[0024] Time-spread modulation based on multi-carrier technology. First multiply the information code with the time-spreading code formed by the 31-bit m code, and then use QPSK (quadrature phase shift keying) to complete the constellation mapping, and then perform multi-carrier modulation, and the multi-carrier symbol width is 2.58ms. At this time, the time domain width of the signal is changed from 1 OFDM (Orthogonal Frequency Division Multiplexing) symbol width to 31 OFDM symbol widths, that is, 80 ms.

[0025] Step 2: Spread Spectrum Modulation

[0026] The signal obtained in step 1 is subj...

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Abstract

The invention relates to the fields of water sound communication, low-interception information transmission technologies and the like, in particular to a low-interception water sound remote control method based on time frequency expansion. The low-interception water sound remote control method based on time frequency expansion includes time expanding modulation based on the multi-carrier technology, spread spectrum modulation, spread spectrum demodulation and time expanding code modulation based on sub-carrier demodulation. The low-interception water sound remote control method has low instantaneous power and spectrum density, and an interception party difficultly finds the existence of communication. A time expanding code and a spread spectrum code are used for encrypting information, and therefore the interception party difficultly accurately demodulates the information. The large processing gain is achieved on a matched receiver, a system with the technology adopted can work normally under the low signal to noise ratio, and the low-interception performance can be further improved.

Description

technical field [0001] The invention relates to the fields of underwater acoustic communication, low-intercept information transmission technology and the like, in particular to a low-intercept underwater acoustic remote control method based on time-frequency expansion. Background technique [0002] The demand for underwater acoustic remote control technology is increasingly urgent for national defense construction and marine resource development, and the research on underwater acoustic remote control technology has also attracted much attention. Underwater acoustic remote control technology can be used to control underwater weapons. At the same time, it also has many applications in civil facilities such as offshore oil drilling platforms and underwater oil pipeline laying. Due to the special application background of underwater acoustic remote control technology, the underwater acoustic remote control technology with low probability of interception is a research hotspot. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B1/707
Inventor 王燕韩成龙付进梁国龙孟凡红范展
Owner 三亚哈尔滨工程大学南海创新发展基地
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