汽化激光致声跨界通信的三维数值特性  

Three-dimensional numerical characteristics of optical-to-acoustic transboundary communication in vaporization mechanism

作　　者：李恪 梁家平 姚瑶 张杨 宗思光[3] 刘涛[3] Li Ke;Liang Jiaping;Yao Yao;Zhang Yang;Zong Siguang;Liu Tao(Engineering College,Shantou University,Shantou 515063,China;Naval Research Institute,Beijing 100161,China;Electronic Engineering College,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]汕头大学工学院,广东汕头515063 [2]海军研究院,北京100161 [3]海军工程大学电子工程学院,湖北武汉430033

出　　处：《红外与激光工程》2023年第11期278-290,共13页Infrared and Laser Engineering

摘　　要：激光致声技术可以将空气中的激光信号转化为水下的水声信号,将两种最佳信道高效地结合起来,从而解决空中-水下跨界通信问题。为了提高激光致声跨界通信的保密性和光声转化效率,采用了数值计算方法对不同条件下,激光在海面三维散射特性和透射特性进行了研究。首先,为了提高仿真计算的准确性,建立了三维激光海面散射场的数学模型。其次,采用数值计算方法求解三维激光海面散射的表面积分方程,并根据入射光波的特点,对入射界面进行强、弱区划分,以提高计算效率。最后,通过室内模拟试验对仿真结果进行了验证。研究结果表明,入射角度对于汽化激光致声通信的保密性和效率有着重要的影响,为后续的系统设计和相关应用研究提供了有意义的参考。Objective Due to the strong attenuation of electromagnetic waves by seawater and the complex and variable characteristics of ocean acoustic channels,a single communication method can not meet the long-distance communication needs of aerial platforms for underwater targets.Optical-to-acoustic technology can convert laser signals in the atmosphere into underwater acoustic signals,combining two optimal channels to overcome the bottleneck problems,that is,large attenuation of single electromagnetic waves in water and strong divergence in the atmosphere.And this technology does not require sound waves to be transmitted remotely through underwater channels,resulting in minimal interference to the signal and extremely high transmission efficiency.However,different incident angles play an important role in the photoacoustic conversion efficiency and confidentiality of air-underwater transboundary communication.And vaporization mechanism is more feasible than other mechanisms.Therefore,it is necessary to use numerical calculation methods to study the three-dimensional scattering characteristics of laser on rough sea surfaces at different sea conditions and incidence angles,in order to improve the confidentiality of optical-to-acoustic transboundary communication in vaporization mechanism and accurately grasp the variation characteristics of laser transmission energy intensity with incidence angle.Methods To improve the accuracy of simulation results,mathematical model of three-dimensional laser scattering field on sea surface was established(Fig.1).To enhance the calculation efficiency,three-dimensional surface integral equation of laser on sea surface was solved with preconditioned conjugate gradient method.And the interface was divided into strong zone and weak zone according to the characteristics of incident light wave to enhance the computing efficiency(Fig.2).And different rough surface in different sea state are simulated(Fig.3).In order to obtain the three-dimensional energy distribution characteristics of the las

关 键 词：跨界通信 激光致声 预条件共轭梯度法 汽化机制 数值特性 转换效率 

分 类 号：P714.3[天文地球—海洋科学]