摘要
罗兰-C信号为载波调制的高斯脉冲,而传统方法对其传播特性预测均是基于100 kHz单频信号结果。文章采用FDTD方法计算了实际罗兰信号的时域特性,并和100 kHz连续单频信号结果进行了比较。结果显示:对于地形起伏不大的传播路径,两种信号结果吻合得很好,而对于地形起伏较大路径,脉冲信号结果与单频信号结果存在较大差异。该结果对地波传播特性工程测量与分析具有一定指导意义。
The traditional methods used to predict the propagation characteristics of Loran signal are all based on single frequency at 100 kHz,even though Loran-C signal is a carrier modulated Gaussian pulse.In this paper,FDTD method is applied to analyze the time-domain characteristics of actual Loran-C signals and the results are compared with that of single frequency.It is found that the results of the two signals match to each other only when the topography relief of the propagation path is not significant.The result of this paper provides guidance to the engineering measurements and analysis of ground wave propagation.
出处
《电波科学学报》
EI
CSCD
北大核心
2010年第2期358-362,共5页
Chinese Journal of Radio Science
基金
国家自然科学基金资助项目(No.60671035)
陕西省重点学科建设专项资金资助项目
关键词
罗兰-C
时域分析
FDTD方法
地波传播
Loran-C
time-domain analysis
FDTD method
ground-wave propagation
