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摘要: 飞机尾流是飞机飞行时在其后方产生的一对反向旋转的强烈湍流，对后续飞机飞行安全具有重大影响，其探测已成为制约机场容量增长和影响空中交通安全管理的瓶颈，亟需发展飞机尾流雷达探测和监视的技术与系统。该文构建了基于激光雷达探测的飞机尾流特征参数反演系统，可基于实测数据反演得到尾流涡心位置和速度环量等特征参数。同时构建了尾流动力学、散射特性与雷达回波仿真模块，可实现参数反演算法的性能评估。该系统的参数反演性能优良，运行稳定，可为机场安全管控提供有效技术手段，为飞机尾流的短时行为预测、危害评估和动态间隔标准制定等提供基础支撑。Abstract: Aircraft wake are a couple of counter-rotating vortices generated by a flying aircraft, which can be very hazardous to a follower aircraft. The detection of it is regarded as a key issue for airport capacity improvement and air traffic safety management. To this end, we constructed a Lidar detection based aircraft wake vortex parameter-retrieval system, which can be used to retrieve the vortex-core positions and circulations from detected data. Furthermore, dynamics, scattering and Lidar echo simulation modules were built to validate the parameter-retrieval algorithms. Results show that the proposed system performs well and runs steadily, which can serve as a good tool for aircraft wake vortex characterization, prediction, and is very helpful to establish dynamic wake separation in air traffic management.
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Key words:
- Lidar /
- Aircraft wake vortex /
- Parameter-retrieval /
- Detection
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图 1 飞机尾流特征参数反演系统流程图
Figure 1. Flow chart of aircraft wake vortex parameter-retrieval system
图 5 飞机尾流左右涡心回波数据示意图
Figure 5. Velocity distribution of the left and right wake vortices
图 6 Gabor滤波后幅度二维分布图
Figure 6. Two-dimensional amplitude distribution after Gabor filter
图 7 多普勒速度极差随径向距离的变化
Figure 7. Variation of Doppler velocity range along radial distance
图 10 左涡心径向距离上的两个探测单元速度分解
Figure 10. Velocity analysis of two detection units above and below the left vortex core
图 13 飞机尾流多普勒速度和涡心轨迹的时间演化
Figure 13. Evolution of wake vortex Doppler velocity and vortex-core trajectory
图 15 飞机尾流速度环量的理论与估计值对比
Figure 15. Comparison of wake vortex theory and estimated circulation
图 16 香港机场飞机尾流激光雷达探测示意图
Figure 16. Lidar detection scene at Hongkong international airport
图 17 飞机尾流速度环量估计方法设置
Figure 17. Interface of wake vortex circulation estimation algorithm
图 18 飞机尾流实测数据涡心位置演化
Figure 18. Retrieval results of wake vortex core trajectory from detected data
图 19 飞机尾流实测数据速度环量估计
Figure 19. Retrieval results of wake vortex circulations from detected data
表 1 激光雷达仿真参数
Table 1. Simulation parameters of the Lidar
主要参数 量值 雷达波长(μm) 1.54 脉冲宽度(ns) 170 采样率(MHz) 50 脉冲积累数 1500 信号噪声比(dB) –5 FFT点数 1024 距离门宽度(m) 21 
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表 2 香港国际机场探测激光雷达参数
Table 2. Parameters of Lidar used to detect at Hongkong international airport
主要参数 量值 雷达波长(μm) 1.54 脉冲宽度(ns) 200 脉冲重复频率(kHz) 20 探测距离(m) [50, 6000] 俯仰角(°) 0.83～10.77 距离门宽度(m) 25
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