摘要
针对无人机下行单全向天线系统,依据无人机环境特点,建立并分析了基于圆筒散射三维几何传播信道模型。根据方位角非全向散射特性和俯仰角非对称分布特点,结合无人机实际飞行参数特点,推导出简化的闭环时频相关函数,结果表明简化后的时频相关特性与地面控制站俯仰角分布无关。而方位角分布对时频相关特性影响较大,通过仿真进行了验证和时频相关特性影响因素分析。
According to the of characteristics of surroundings of Unmanned Aerial Vehicle(UAV)in wideband Single-Input Single-Output(SISO)down-link channel,we present a three-dimensional(3D)geometrically based cylinder scattering model(GBCSM)with line of sight,specular and diffuse components.A terse closed-loop joint time-frequency correlation function is derived for the three-dimensional non-isotropic scattering environment and asymmetrical characteristic based on the flight parameters in practice.The simplified function shows that the correlation characteristic is only affected by non-isotropic scattering of the azimuth.Simulations indicate the feasibility and validity of the simplification.The affecting factors of time-frequency correlation are analyzed in the simulation.
出处
《无线电工程》
2010年第12期7-11,共5页
Radio Engineering
