“地-电离层”波导结构中媒质变化对VLF电波场强的影响  

Influence of medium parameter variation on VLF electric field in the earth-ionosphere waveguide

作　　者：蒲玉蓉[1] 辛楠 李毅 席晓莉[1] PU Yurong;XIN Nan;LI Yi;XI Xiaoli(School of Automation and Information Engineering,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安理工大学自动化与信息工程学院

出　　处：《西安理工大学学报》2019年第4期427-433,共7页Journal of Xi'an University of Technology

基　　金：中央军委装备预研领域基金资助项目(6140518020205);国家自然科学基金资助项目(61771389);陕西省自然科学基础研究计划资助项目(2016JQ4003)

摘　　要：甚低频(VLF)无线电波被广泛应用于超远程导航与通信,而其传播信道内电离层与地层媒质的复杂非均匀变化成为影响其传播特性的主要因素。本文采用二维球坐标时域有限差分(FDTD)方法,结合基于GPU的并行加速策略,仿真分析了电离层参数变化、地质类型改变等对电波传播性能的影响。同时,针对“地-电离层”波导中媒质的突变不均匀性,采用局部复杂区域的非均匀网格剖分技术,仿真分析了跨昼夜路径以及陆海混合路径下的甚低频电波传播特性,在保证计算精度的同时,大大减少计算机消耗、缩短计算时间。The very low frequency(VLF)radio waves are widely used in ultra-long-range navigation and communication,with the complexity and non-uniformity of ionospheric and earth’s medium in the propagation channel being the main factors affecting the VLF wave propagation properties.In this paper,the 2-D spherical coordinates finite-difference time-domain(FDTD)method with the parallel acceleration strategy based on GPU is proposed.The effects of ionospheric variations and different geological types on radio wave propagation are analyzed.Besides,the characteristics of the VLF wave propagation in the day-to-night path and land-sea mixed path are analyzed by using the non-uniform meshing technique in the mutant complex region of the ground-ionosphere waveguide,which not only ensures the accuracy of the calculation but also greatly reduces the consumption of computer and the calculation time.

关 键 词：FDTD方法 非均匀网格 GPU并行技术 甚低频电波传播 

分 类 号：TN[电子电信]