短波信道模型改进及功率预测方法

Method of HF Channel Modeling and Field Strength Predicting

针对短波信道的多径、多普勒频移、多普勒扩展等特点,介绍了Watterson模型、ITS模型并分析了其优缺点,提出了可以体现短波通信不同天波和地波损耗的分段信道模型。在此基础上,分别从地波和天波两方面研究了损耗特点和基本天波传播参数,提出了地波和天波的场强和功率预测方法。数值仿真表明,该场强预测结果能够反映不同场景下的场强、功率与经纬度变化关系,同时能够根据接收点场强、功率反演发射点位置,对短波信道建模研究起到指导作用。

According to the characteristics of multipath,Doppler frequency shift and Doppler spread of shortwave channel,Watterson model and ITS model are introduced and their advantages and disadvantages are analyzed.A segmented channel model that can reflect different sky-wave and ground-wave losses in shortwave communication is proposed.On this basis,the loss characteristics of ground wave and sky wave are studied respectively,the basic sky wave propagation parameters are studied,and the field strength and power prediction method of ground wave and sky wave is proposed.Numerical simulations show that the field strength prediction results in this paper can reflect the relationship between the field strength,power and latitude and longitude in different scenarios,and at the same time,the position of the transmitter point can be inverted according to the field strength and power of the receiving point,which plays a guiding role in the research on shortwave channel modeling.