非线性时变机载雷达微下击暴流目标回波建模与算法设计

Modeling and algorithm design of the nonlinear time-varying airborne radar microburst target

为了有效分析微下击暴流产生机理以及在非对称风场条件下微下击暴流的风速估计和回波谱,利用网格划分法的基本原理,结合多普勒效应建立了微下击暴流目标回波数学模型,并提出了一种机载雷达微下击暴流信号的处理算法.在非对称风场情形下仿真分析了顺风、偏风、侧风以及逆风时微下击暴流的风速估计以及功率谱.仿真结果表明,在不同距离门上的顺风、逆风、侧风以及偏风的风速变化符合微下击暴流的特征,非对称风场下的微下击暴流雨回波三维功率谱分布与非对称风场中的径向速度分布一致.

In order to analyze generating mechanism of and echo spectrum under asymmetric wind field. The microburst wind shear and wind speed estimation mathematical model of wind shear target echo is established by using mesh generation, combined with Doppler effect, the airborne radar wind shear signal processing algorithm is presented. The wind speed estimation and the rain echo power spectrum are simulated under following wind, partial wind, cross wind and against the wind. The simulation results showed that wind-speed alterations is suitable for the actual wind characteristic under following wind, partial wind, cross wind and against the wind in different range gates. Asymmetric three-dimensional wind shear off the wind rain echo power spectrum distribution with asymmetric wind field in the radial velocity distribution the three-dimensional rain echo power spectrum distribution of wind shear is consistent with the radial velocity distribution under asymmetric field wind.