摘要
This paper numerically investigates the radio wave scattering by the artificial acoustic disturbance in the atmospheric boundary layer. The numerical model is based on the finitedifference time-domain（FDTD） method for radio wave propagation and fluid simulation for atmospheric disturbance by acoustics waves. The characteristics of radio wave scattering propagation in the artificial acoustic perturbations are investigated by this numerical model. The numerical simulation results demonstrate that the radio wave propagation scattered by acoustic scatterer has the characteristic of forward tropospheric scatter. When the radio waves are scattered, they distribute in all directions; a majority of radio waves continues to propagate along the original direction, and only a small part of the energy is scattered. For the same acoustic scatterer, if we merely change the radio wave emission elevation, the horizontal spans of forward scattering radio wave packets centers gradually decrease with the increasing of emission elevations; and the energy of wave packets increases firstly and then decreases with launching elevation, reaching the maximum at a certain angle. If we merely change the wave emitting position, the horizontal spans decrease with the increasing of emission positions, and the energy of wave packets also increases firstly and then decreases with launch position, reaching the maximum at a certain position. This approach can be very promising for atmospheric scatter communications.
This paper numerically investigates the radio wave scattering by the artificial acoustic disturbance in the atmospheric boundary layer. The numerical model is based on the finitedifference time-domain（FDTD） method for radio wave propagation and fluid simulation for atmospheric disturbance by acoustics waves. The characteristics of radio wave scattering propagation in the artificial acoustic perturbations are investigated by this numerical model. The numerical simulation results demonstrate that the radio wave propagation scattered by acoustic scatterer has the characteristic of forward tropospheric scatter. When the radio waves are scattered, they distribute in all directions; a majority of radio waves continues to propagate along the original direction, and only a small part of the energy is scattered. For the same acoustic scatterer, if we merely change the radio wave emission elevation, the horizontal spans of forward scattering radio wave packets centers gradually decrease with the increasing of emission elevations; and the energy of wave packets increases firstly and then decreases with launching elevation, reaching the maximum at a certain angle. If we merely change the wave emitting position, the horizontal spans decrease with the increasing of emission positions, and the energy of wave packets also increases firstly and then decreases with launch position, reaching the maximum at a certain position. This approach can be very promising for atmospheric scatter communications.
基金
supported by the National Natural Science Foundation of China(41204111
41574146
41774162)
作者简介
WANG Panpan was born in 1988. She receivedher B.S. degree in electronic science and technologyfrom Wuhan Donghu University in 2011. Shehas been studying for her doctor＇s degree in WuhanUniversity from 2011. Her research interests includeradio wave scattering propagation and atmosphericacoustic wave propagation.E-mail： 810463220@qq.com;ZHOU Chen was born in 1983. He received hisPh.D. degree in space physics from Wuhan Universityin 2009. He now is an associate professorin School of Electronic Information, Wuhan University.His research interests include ionospherephysics and ionosphere radio waves propagation.E-mail： chenzhou@whu.edu.cn;ZHAO Zhengyu was born in 1952. He is a professorand doctoral supervisor in School of ElectronicInformation, Wuhan University. His research interestsinclude ionosphere physics and ionosphere radiowaves propagation.E-mail： zhaozy@whu.edu.cn
