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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  • Abstract
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Problems solved by technology

Thus seriously affecting the quality of underwater acoustic communication
Although OQPSK has improved (elimin

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

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

[0051] As shown in Figure 1(a), the source signal and the PN sequence modulo 2 add to achieve spread spectrum modulation. Then this spread spectrum modulated signal is modulated by MSK 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 the local MSK modulator to achieve local PN code synchronization and carrier synchronization. The local PN code is modulated by the local MSK and coherently despread with the received signal. Then the synchronization signal is sent to the low-pass filter, and the despread signal is low-pass filtered to realize the demodulation and the signal output will obtain the desired received information. Spread spectrum communication parameters are selected according to t...

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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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