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A water sound communication method of shallow sea remote horizontal channel

A technology of underwater acoustic communication and underwater acoustic channel, applied in transmission systems, electrical components, multi-frequency code systems, etc., can solve problems affecting the quality of underwater acoustic communication, overcome multipath interference of remote underwater acoustic channels, and reduce bit errors efficiency and improve spectrum utilization

Inactive Publication Date: 2007-11-28
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus seriously affecting the quality of underwater acoustic communication
Although OQPSK has improved (eliminating 180-degree phase mutation), it still does not fundamentally solve the problem of envelope fluctuations

Method used

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  • A water sound communication method of shallow sea remote horizontal channel
  • A water sound communication method of shallow sea remote horizontal channel
  • A water sound communication method of shallow sea remote horizontal channel

Examples

Experimental program
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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0051] As shown in Figure 1(a), the source signal and PN sequence modulo 2 are added to realize spread spectrum modulation. Then the spread-spectrum modulation signal is subjected to MSK modulation to form a radio frequency transmission signal. Figure (b) shows the functional block diagram of the receiver. After the received signal is synchronized, the synchronization signal is sent to the local PN code generator and local MSK modulator to realize local PN code synchronization and carrier synchronization. Modulate the local PN code through local MSK, and despread it coherently with the received signal. Then the synchronous signal is sent to the low-pass filter, and the despread signal is demodulated by the low-pass filter to obtain the desired receiving information after the signal output. The spread spectrum communication parameters are sele...

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Abstract

The invention discloses a hydroacoustic communicating method of shallow sea remote level channel, which is characterized by the following: adopting the modulating pattern of continuous phase frequency shift keying (CPFSK) to modulate highest utility rate MSK pattern to solve envelope constant and phase mutation problem; fitting for remote shallow sea level channel; adopting coherent deexpanding pattern for communicating end to realize high-property transmission; displaying good spread-spectrum communication on the multi-path for hydroacoustic channel.

Description

technical field [0001] The invention relates to a shallow sea long-distance horizontal channel underwater acoustic communication method, more specifically, relates to a modulation and demodulation method used in shallow sea long-distance horizontal channel underwater acoustic communication, and belongs to the technical field of underwater acoustic communication. Background technique [0002] Underwater acoustic communication systems are generally divided into short-range (<1 km), medium-range (1-20 km) and long-range (20-200 km) according to the communication distance; according to channel characteristics, they can be divided into horizontal communication and vertical communication and shallow sea communication and Deep sea communication; according to communication modulation and demodulation technology, it can be divided into non-coherent communication and coherent communication. [0003] Underwater acoustic communication is in the development stage. For shallow sea lon...

Claims

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Application Information

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IPC IPC(8): H04B13/02H04B1/69H04L27/26H04B1/707
Inventor 朱刚王九九
Owner BEIJING JIAOTONG UNIV
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