飞机尾流的雷达回波Doppler特性分析

尾流的形状大小及强度等主要由飞机飞行重量、飞行速度及机翼结构等参数决定.在湿性大气条件下,尾流对电磁波的散射主要是由尾流系统中微粒的Bayleigh散射造成的,通过分析尾流粒子模型的速度谱,得到了尾涡速度谱与Doppler速度之间的关系,这一特性与大气环境中湍流的特性有明显区别,可为飞机尾流的雷达探测和定位问题提供理论依据,并可指导雷达设计,从而引导飞行器规避飞机尾流,减少飞行事故的发生.

Analysis of the Doppler Characteristic of Radar Echo of Aircraft Wake Vortices

The shape and size of wake vortices are depanded on the parameter such as weight,rate and aerofoil structure etc of the aircraft.Under the wet atmosphere conditions,the wake vortex scattering is caused by Rayleigh particles in the wake vortices system.The relation between the speed spectrum of wake vortex and Doppler speed is obtained from analyzing speed spectrum of model of wake vortex particles.which is obviously different from the characteristic of onflow in the atmosphere.It provides the detection and orientation of aero wake vortices with a theoretic basis.It is also helpful for designing radars to guide the aerocraft to avoid aero wake vortices and reduce the occurrence of aero accide.