基于微物理特性的三维低空风切变雷达回波仿真

Microphysics-based radar signal simulation for the three-dimensional low altitude wind shear

低空风切变是一种危险性非常高的恶劣天气现象,对民航飞机起飞和着陆阶段的航行安全威胁最大。由于其具有发生突然、持续时间较短、影响强度大和危险性高等特点,使得真实的雷达回波数据难以轻易获取。在分析风切变目标微物理特性的基础上,利用计算流体力学的仿真方法建立三维风场模型,在对非均匀的原始风场数据进行预处理之后,依据民航装机使用的机载气象雷达设备设置扫描参数,利用逐脉冲撒点仿真法实现高保真的三维低空风切变雷达回波仿真。仿真结果表明,雷达回波数据可真实地反映出风切变信号的气象特征,仿真过程设计合理,仿真数据有效可靠。

As in landing or takeoff, approach or takeoff, low altitude wind shear is one of the most danger- ous weather phenomenon to the aviation safety. Due to the characteristics of suddenness, short duration, heavy intensity and high hazard, it is difficult to obtain the real radar data of the wind shear. Based on the terminal ar- ea simulation system （TASS） model and combined with microphysical property of wind shear, a 3D wind field model is proposed by using the computational fluid dynamics method. After the preprocessing of the original non uniform wind field data, the scanning parameters are set up in accordance with the real airborne weather radar, the sprinkle point method is used to implement low altitude wind shear high-fidelity 3D signal simulation. Results of simu- lation prove that the proposed method can provide effective and reliable simulation data, which can veritably reflect the meteorological characteristics of the wind shear echo signals, and the design of the simulation process is reasonable.