激光诱导声波的跳时隙水下数据传输方法  

Underwater Time Slot-Hopping Data Transmission Based on Laser-Induced Acoustic Waves

作　　者：廖欣[1,2] 蒋红艳 何宁[1,2] Liao Xin;Jiang Hongyan;He Ning(School of Information and Commsonication,Grilin Unitrrsity of Electronic Technology,Guilin 541004,Guangei,China;Guangxi Key Laborutory of Wireless Broadbund Communication and Sigual Proessing,Guilin 541004,Guangxi,China)

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 [2]广西无线宽带通信与信号处理重点实验室,广西桂林541004

出　　处：《中国激光》2022年第18期104-111,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(61961008);广西无线宽带通信与信号处理重点实验室主任基金(GXKL06200127)。

摘　　要：针对跨介质无线通信信道的约束影响,依据大气与海洋环境通信特点,提出一种利用激光诱导声波实现跨介质的跳时隙脉冲位置调制(PPM)水下通信的信号传输方法。研究光声效应机理,分析激光声源在水下的时频特性,采用无线光通信与水声通信技术的融合机制,合理选择跳时隙类型组合编码调制,有效提高信息传输可靠性及安全性。基于脉冲激光声源建立空中到水下的跳时隙PPM通信链路,通过现场可编程门阵列(FPGA)完成编解码,实现了字节组帧的信息传输测试。实验测试结果证明:以脉冲激光作用水介质激发的声波通信,可进行远程指定水域的激光致声控制,将光视距通信转换为水下任意位置目标通信,大大提高了通信作业的灵活性和主动性,可用于空中到水下的跨介质通信。Objective Aiming at the constraints in cross-medium wireless communication and according to the characteristics of atmospheric and oceanic communication,the laser-induced acoustic communication adopting time slot-hopping pulse position modulation(PPM)is proposed to achieve cross-medium signal transmission.The mechanism of optoacoustic effect is studied.Meanwhile,the time-and frequency-domain characteristics of the laser-induced sound in the underwater conditions are analyzed.Combining atmospheric optical wireless communication with underwater acoustic communication and reasonably selecting time slot combination for hopping,the reliability and security for information transmission can be effectively improved.Based on the pulsed laser-induced sound,a time slot-hopping PPM communication link from air to underwater is established,where field programmable gate array(FPGA)is adopted to achieve coding and decoding.Tests for information transmission by frames are accomplished.Note that each frame has one-byte data.Using time slot-hopping technology can effectively reduce the interception probability of the transmitted signal.Methods The interaction of laser pulse with gas,liquid and solid can induce acoustic waves.Firstly,according to the basic theory of laser-induced acoustic waves in liquid,including the effects of laser characteristics,liquid characteristics and incidence angle on optoacoustic energy conversion efficiency as well as excitation mechanism,a technical methodology for cross-medium communication from air to water is introduced in this paper,where the pulsating acoustic source radiates radially outward in the form of spherical wave(Fig.1).Subsquently,the PPM format with variable time slots is used.Framing with two pilot pulses and one-byte data,three frames with different time slots are presented(Fig.3).Finally,the coding and decoding of time slot-hopping PPM is achieved by FPGA,and then the experimental test platform based on laser-induced acoustic waves is established for data transmission and analysis(Fi

关 键 词：激光光学 光声效应 激光诱导声波 跳时隙 字节组帧 导频码 

分 类 号：TN249[电子电信—物理电子学]