Path integration (PI) method for the parameter-retrieval of aircraft wake vortex by Lidar

被引:20
作者
Li, Jianbing [1 ]
Shen, Chun [1 ]
Gao, Hang [1 ]
Chan, P. W. [2 ]
Hon, K. K. [2 ]
Wang, Xuesong [1 ]
机构
[1] Natl Univ Def Technol, Coll Elect Sci & Technol, State Key Lab Complex Electromagnet Environm Effe, Changsha 410073, Hunan, Peoples R China
[2] Hong Kong Observ, 134A Nathan Rd, Hong Kong 999077, Peoples R China
基金
中国国家自然科学基金; 湖南省自然科学基金;
关键词
CIRCULATION RETRIEVAL; RAINY CONDITION; VORTICES; RADAR;
D O I
10.1364/OE.382968
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Aircraft wake is a pair of strong counter-rotating vortices generated behind a flying aircraft. It might be very hazardous to a following aircraft and the real-time detection of it is of great interest in aviation safety field. Vortex-core positions and velocity circulations, which respectively represent the location and strength of a wake, are two characteristic parameters that have attracted the main attention in wake vortex detection. This paper introduces a new algorithm, the Path Integration (PI) method, to retrieve the characteristic parameters of wake vortex. The method uses Doppler velocity distribution to locate the vortex-core positions, and the integration of Doppler velocity along a LOS (line-of-sight) is derived as a linear expression about the circulations. From this expression, the circulations can be solved with the least square method. Moreover, an vortex-core position adjusting method is proposed to compensate the compressing and expanding effects of wake vortex caused by the scanning of Lidar beam. Basically, the use of Doppler velocity integration can improve the method's adaptability in turbulence environment and mitigate the impact of noise. Numerical examples and field detection data from Hong Kong international airport and Tsingtao Liuting airport have well verified the good performance of the method, in terms of both accuracy and efficiency. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码:4286 / 4306
页数:21
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