Radio Wave Propagation Characteristics And Analysis Software Development In Troposphere Based On Split Step Wavelet Method

The tropospheric scattering propagation has the advantages of beyond-line-of-sight,large capacity and high reliability,and has a wide application prospect in military and civil fields.However,due to the influence of atmospheric dynamics and thermodynamics,the tropospheric refraction index exhibits time-varying and space-varying characteristics.In addition,reflection,diffraction and refraction are interwoven together,making tropospheric scattering propagation very complicated.Aiming at the complexity of tropospheric wave propagation,and which is very important for the design and optimization of wireless communication systems.A method for analyzing the tropospheric wave propagation characteristics based on split step wavelet method is proposed.In order to more flexible selection of parameters,the analysis software is developed in the Matlab environment.the main work is carried out as follows.First,based on the advantage of wavelet analysis of space-time variation,the method of analyzing the propagation characteristics of tropospheric radio waves by split step wavelet is studied.secondly,the waveguide structure of the troposphere and several atmospheric refractive index models are analyzed.According to the basic theory of propagation loss of radio waves in the troposphere,the propagation loss of the electric wave is calculated.And then using Matlab software,the tropospheric radio wave propagation analysis software and the graphical user interface(GUI)are developed.Finally,using the developed software,the wave propagation loss of the standard environment and the evaporation duct environment are numerically analyzed.Moreover,the Split Step Wavelet Method(SSWM)and Split Step Fourier Transform(SSFT)are compared,and the numerical results are consistent.The results show that the softwore is simple to operate,flexible input and selection parameters,and the visual output of electromagnetic propagation on a two-dimensional plane of height-propagation distance are presented:the propagation loss is closely related to the antenna height and elevation angle.The smaller the antenna elevation angle,the smaller the propagation loss.The larger the antenna height,the smaller the propagation loss.In addition,the propagation loss in an evaporation duct environment is smaller than that in a standard atmospheric environment.