海气信道下激光致声下行水声通信系统探讨  

Research on underwater acoustic communication of laser acoustic downlink through air-sea transmission channel

作　　者：黄灵鹭[1] 何宁[1] 冯太琴[1] 何志毅[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《激光与红外》2014年第9期972-976,共5页Laser & Infrared

基　　金：国家自然科学基金(No.61077036)资助项目

摘　　要：构建1.064μm脉冲激光致声水声通信系统,依据激光致声机理,研究激光脉冲能量与声能量关系,分析水下致声信号特征和传输特性,针对水下噪声信号与致声信号的频谱特性,采用滤波方法从频域进行了有效分离。通过理论分析和实验验证,结果表明声波转换能量与激光脉冲能量成正比,选择不同的光学结构可获得不同的致声能量,采用基频可调的ASK编码方式可实现数字信息的有效传送,为海洋通信提供新的技术途径。An underwater acoustic communication system of 1.064 μm pulse laser is established.According to the mechanism of laser acoustic,the relationship between the laser pulse energy and the acoustic energy is studied,and the characteristics of laser acoustic signal and transmission under water are analyzed.Aiming at the spectrum charac-teristics of noise signal and laser acoustic signal,filtering method is used for effective signal separation in frequency domain.Theoretical analysis and experimental results show that acoustic energy increases with the increase of laser pulse energy,and different optical structures can obtain different acoustic energy.Frequency adjustable ASK code modulation can realize the effective transmission of digital information,which provides a new technical method for ma-rine communications.

关 键 词：激光致声 海气信道 水声通信 基频可调 ASK 编码 

分 类 号：O426.3[理学—声学]