| 摘要: |
| 天波通信利用电磁波在电离层反射实现无线信号的超视距传输，其通信质量与射频装备工作时的电离层状态密切相关。针对传统频域天波仿真模型在波形失真、传输时延和多径时延等时域特征分析上的不足，提出了一种基于抛物方程时域的天波通信链路仿真分析方法。该方法在建立电离层折射指数模型的基础上，采用带内采样和多频点扫描计算的方式，由分步傅里叶变换算法计算收发位置间的信道频率响应，然后基于信道传递函数与脉冲频谱函数，联合傅里叶综合与相关函数法，得到天波传输的波形和多径时延等时域信息。通过与射线追踪法对比，说明了该方法的可行性。利用该方法，对天波通信链路进行了定量计算与分析。结果表明，天波信号衰减、时延和多径效应与工作频段、工作时段以及收发位置密切相关。仿真结果可为短波通信系统的设计论证和效果评估提供参考。 |
| 关键词: 高频电磁波 天波通信 通信链路仿真 抛物方程 多径时延 |
| DOI：10.20079/j.issn.1001-893x.240323001 |
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| 基金项目: |
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| A Parabolic Equation Method for Simulation Analysis of Sky-wave Communication Links in Time-domain |
| ZHANG Dongmin |
| (1.Southwest China Institute of Electronic Technology,Chengdu 610036,China;2.National Key Laboratory of Complex Aviation System Simulation,Chengdu 610036,China) |
| Abstract: |
| The wireless link quality of sky-wave communication is closely related to the ionosphere condition during the operation of radio frequency equipment.A modeling method of high-frequency sky-wave propagation in the time-domain based on a parabolic equation is proposed.On the basis of establishing an atmospheric refractive index to take into account the refraction and attenuation of electromagnetic waves,the channel frequency response between the receiving and transmitting positions is obtained by a split-step Fourier transform algorithm and a method of frequency scanning within the bandwidth.Then,the characteristic parameters of sky-wave propagation are obtained by methods of Fourier synthesis and correlation function.Compared with the traditional version,this method supports the time-domain analysis of pulse waveform,propagation delay,and multipath delay.The feasibility of this method is demonstrated by comparing it with the ray tracing method.The presented method is applied to analyze the transmission characteristics of sky-wave communication links.The simulation results show that the attenuation,delay,and multipath effects of sky-wave signals are closely related to the operating frequency band,operating period,and spatial location.This study can provide technical reference for the demonstration and design of shortwave communication systems. |
| Key words: high frequency electromagnetic wave sky-wave communication communication link simulation parabolic equation multipath delay |
《电讯技术》编辑部 