云雾中飞机尾流毫米波雷达多普勒特性研究

The millimeter band doppler characteristics of wake vortices in cloudy and foggy

构建了尾流中云雾滴运动微分方程,通过求解运动方程得到了尾流中云雾滴的运动轨迹、速度分布等特性.分析了尾流中云雾滴的密度分布特性,并以典型的W波段雷达为例,分析了云雾中尾流的探测距离.在此基础上,提出了一种云雾中尾流雷达多普勒特性模拟方法,得到了典型毫米波雷达空间分辨率和观测视角下云雾中尾流的多普勒特性.研究结果表明,云雾中尾流毫米波雷达回波调制了丰富的尾流速度场信息,可为航空安全提供特征支撑.

The differential equations of motion of the cloud droplets in wake vortices were derived. The trajectory and velocity distribution of cloud droplets in wake vortices were obtained by solving the equations of motion. Referring to the parameters of the typical W band millimeter-wave radar, the maximum detection range of wake vortex was analyzed. Then a methodology to simulate the radar Doppler characteristics of wake vortices in cloud was proposed, and the Doppler characteristics of wake vortices in cloud under typical resolution conditions were simulated. The simulation resuits show that Doppler characteristics of wake vortices in cloud are consistent with the velocity characteristics of wake vortices.