Infrared and Laser Engineering, Volume. 52, Issue 11, 20230160(2023)
Optimization of aircraft wake vortex inversion algorithm near ground based on Doppler lidar
Figures & Tables(21)
Fig. 2. The enhancement of broadening effect under the influence of wake vortex
Fig. 5. Schematic diagram of focalization principle in region. (a) Radial wind speed diagram; (b) Spectrum width diagram
Fig. 9. (a) Site observation of Chengdu Shuangliu International Airport; (b) Observation scheme diagram
Fig. 10. The diagram of observation results. (a) Radial wind speed diagram; (b) Spectrum width diagram
Fig. 11. Radial distance solution of wake vortex. (a) Radial wind speed method; (b) Variation curve of the maximum spectral width with the lidar distance; (c) Fast identification method
Fig. 12. Regional focus result diagram. (a) Radial wind speed diagram; (b) Spectrum width diagram
Fig. 13. The maximum (minimum) velocity envelope. (a) Left vortex core distance library; (b) Right vortex core distance library
Fig. 14. The identification results of the wake vortex position. (a) Radial wind speed diagram; (b) Spectrum width diagram
Fig. 15. Circulation correction results and corresponding B-H model fitting
Fig. 17. Chengdu Shuangliu Airport Flight Information (2018.09.07)
Fig. 18. Statistical comparison chart of method results before and after optimization
Table 1. Validation conditions and discrimination methods
View tableView in ArticleTable 1. Validation conditions and discrimination methods
Verification conditions Judgment method Proximity verification There is no region between the identified two vortex core positions that conforms to the characteristics of the wake vortex Similarity verification The ratio of DR value at the position of two vortex cores should be within a certain range Size verification The number of elevation angles with high broadening at the identified two vortex cores should be greater than a certain value
Table 2. Main technical indexes of 3D scanning coherent Doppler lidar
View tableView in ArticleTable 2. Main technical indexes of 3D scanning coherent Doppler lidar
Parameter Technical parameter Parameter Technical parameter Wavelength/μm 1.55 Speed range/m·s−1 ±37.5 Sampling frequency/GHz 1 Speed accuracy/m·s−1 ≤0.1 Pulse repetition frequency/kHz 10 Scanning servo accuracy/(°) 0.1 Pulse energy/μJ 150 Scanning speed/(°)·s−1 1-50 Pulse width/ns 100-400 Data refresh rate/Hz 1-10 Radial detection range/m 45-6 000 Power/W <300 Radial distance resolution/m 15-60 Weight/kg <90
Table 3. Cause analysis of abnormal identification
View tableView in ArticleTable 3. Cause analysis of abnormal identification
Error type Cause Concrete analysis Misreporting (93 cases) Dissipation Low strength (18 cases) Radial velocity component of wake vortex is close to background wind speed Unpaired (34 cases) There is only one vortex in the scanning range Low strength (31cases) Tangential velocity is close to background wind speed Interference Crosswind interference (1 cases) Due to cross wind interference, the maximum (minimum) radial velocity found is independent of the wake vortex, and the characteristics of the wake vortex rotation are not correctly identified Ground interference (2 cases) Due to the decrease of wind speed at the ground, the maximum (minimum) radial wind speed is not related to the wake vortex, and the characteristics of wake vortex rotation are not correctly identified Occlusion (3 cases) Covered by aircraft, wake vortex feature destroyed, recognition failed Wake vortex distortion (3 cases) Failed secondary verification Wind speed data anomalies (1 case) Abnormal data at wake vortex position, resulting in failure to distinguish properly False alarm (2 cases) Data anomalies (2 cases) Existence of similar wake vortex structure by interpolation of some abnormal data
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Rongchuan Zhang, Xiaoye Wang, Hongwei Zhang, Xiaoying Liu, Xitao Wang, Shengguang Qin, Jiaping Yin, Qichao Wang, Songhua Wu. Optimization of aircraft wake vortex inversion algorithm near ground based on Doppler lidar[J]. Infrared and Laser Engineering, 2023, 52(11): 20230160
Paper Information
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Received: Mar. 22, 2023
Accepted: --
Published Online: Jan. 8, 2024
The Author Email: Zhang Hongwei (.Zhanghongwei8944@ouc.edu.cn)
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