基于1.5 μm多普勒激光雷达的飞机尾涡探测技术研究

为规避尾涡威胁,保障飞行安全,研究了飞机尾涡的激光探测技术.介绍了尾涡探测基本原理,给出了激光探测方式设计和探测系统参量选择.基于设计的尾涡激光探测方案,研究了飞机尾涡回波多普勒谱与机型参量、飞行参量以及环境参量间的关系,获得了尾涡的径向速度分布规律,建立了尾涡回波多普勒谱模型,选取最佳尾涡参量估计算法用于尾涡的全面表征|通过开展A340的尾涡探测外场实验验证了激光探测尾涡的可行性和尾涡参量估计算法的有效性.研究表明,尾涡回波多普勒谱值与径向速度的三次方成反比,与涡流环量的二次方成正比.

Research on the Technique of Aircraft Wake Vortex Detection Based on 1.5 μm Doppler Lidar

In order to shun the wake vortex hazard and assure the flight security,the technique of wake vortex detection by Lidar was studied.The basic principle of wake vortex detection was introduced,and both the detection mode and the system parameters of Lidar were also given.Based on the designed scheme of wake vortex detection by Lidar,the relationships between Doppler spectrum value and the parameters of aircraft type,flight and environment were studied.The radial velocity distribution law of wake vortex was acquired,and its the Doppler spectrum model of laser echo was built.Moreover,the optimal parameters estimation algorithm was selected for wake vortex characterization.Based on the performed wake vortex detection experiment of A340,both the feasibility of wake vortex detection by Lidar and the validity of parameters estimation algorithm of wake vortex were verified.The research results show that the laser echo created of wake vortex is inversely proportional to the cube of radial velocity,but is directly proportional to the square of circulation.