摘要
微波在低层大气传输过程中,由于折射,射线将发生弯曲,因此在模拟微波传输轨迹时,必须对电波传输进行折射修正。文章首先介绍了折射率的计算模式和方法,折射率的计算基于具体地区的低层大气气象数据,进而依据球面几何定理和电波传输理论建立了模拟微波低层大气传播轨迹的数学模型,该模型通过对地心夹角等分,将射线轨迹分为若干个段,并分别计算出各段对应点的经纬度和高度。最后根据测得的气象数据利用MATLAB对射线轨迹进行了仿真,从而说明该模型的有效性。
<Abstrcat>When the microwave is propagating in atmosphere, the path curves due to the effect of atmospheric refraction. So the refraction must be considered when the microwave propagation path is simulated. First the method of the refractive index calculation is produced in this paper, which is based on the weather data in some area. Then based on sphere geometry theorem and electric wave propagation theory, the propagation path model of the microwave in lower atmosphere is built. The propagation path of the microwave is divided into some sections by the share of geocentric separation angle and the longitude,latitude and altitude of every separation point are worked out in the model. Finally the radial trace is simulated using MATLAB according to the measured weather data. So the validity of the method is proved with the simulation result.
出处
《计算机仿真》
CSCD
2005年第5期52-55,共4页
Computer Simulation
基金
国家863计划资助项目(2003AA833030)
关键词
微波
大气折射率
传播轨迹
数值仿真
Microwave
Atmospheric refraction index
Propagation path
Numeric simulation
