摘要
为了提高海岸区域低频地波传播特性预测精度,研究了基于J.R.Wait及FDTD全波分析算法的罗兰-C信号海岸效应预测模型;对罗兰-C信号传播至海岸线时的电场幅度与相位的空间驻波状扰动现象进行了仿真比较;分析了突变和线性渐变两种陆海分界模型下,该扰动在近海岸区域的地/海面及其上空的分布规律,并指出该扰动存在波前倾斜现象。仿真分析表明:该研究进一步克服了J.R.Wait算法的局限,限定了驻波扰动变化量级与其在三维空间的分布范围,有助于同时提高罗兰-C系统在海岸区域地/海面及空中的导航授时精度。
In order to improve the prediction accuracy of the low frequency wave propagation characteristics in coastal areas, this paper makes a study of the models for predicting the coast effect in the propagation of a Loran-C signal across the coastline according to J. R. Wait and FDTDmethods and a comparison of the standing wave pattern disturbances on the electric field amplitude and phase of a Loran-C signal. The analysis of sharp and linear changes in the two coastline models, disturbance value, 3D spatial distribution and change on the earth/sea surface and in the air are carried out. The FDTD results indicate that there is a wavefront tilt phenomenon in the disturbance. The simulation study shows that the limitations of J. R. Wait algorithm can be overcome further so as to determine the standing wave change value and 3D spatial distribution range, which is helpful to improving the navigation/timing accuracy on the earth/sea surface and in the air of the seashore.
出处
《海军工程大学学报》
CAS
北大核心
2014年第6期17-21,共5页
Journal of Naval University of Engineering
基金
国家自然科学基金资助项目(61406261
61271091)
陕西省自然科学基础研究计划资助项目(2014JQ8319)
西安市科技计划资助项目(CXY1341(9))
关键词
罗兰-C
FDTD
驻波扰动
Loran-C
FDTD
standing wave pattern disturbance
