Aircraft wake vortex and turbulence measurement under near-ground effect using coherent Doppler lidar

Wu, Songhua; Zhai, Xiaochun; Liu, Bingyi

doi:10.1364/oe.27.001142

Cited by 40 publications

(36 citation statements)

References 30 publications

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“…LiDAR observations indicated that continuous vortex decay was associated with strong turbulence [85] while the two-phase decay, i.e., an initial phase of moderate decay followed by a phase of rapid decay, occurred in weakly turbulence environments [86], corroborating the vortex evolution found in corresponding CFD simulations [87]. With the help of LiDAR measurements, it was found that the radii of vortex cores were almost constant during the decay process [88] and this process could be accelerated by ground effects [75]. To increase the decay rate of wake vortices, Holzäpfel et al [89] suggested installing a plate line on the ground surface.…”

Section: Aircraft Wake Vortexsupporting

confidence: 63%

“…In addition, it provides valuable information for aircraft design. Up to now, Doppler wind LiDAR is the only device recommended by the International Civil Aviation Organization (ICAO) for vortex detection in clear air [75]. Several techniques have been developed to derive the strength of wake vortices from LiDAR measurements.…”

Section: Aircraft Wake Vortexmentioning

confidence: 99%

“…For example, the bias in vortex circulation given by the maximum likelihood estimator was found to be less than 1% [80]. Since estimator-based methods take signal response functions into consideration, they are suitable for vortex identification when SNR is low [75]. To provide accurate vortex estimation in a reasonable time frame, a hybrid method was developed to use the velocity envelopes to locate aircraft wake vortices and employ the maximum likelihood algorithm to estimate the vortex circulation [81].…”

Section: Aircraft Wake Vortexmentioning

confidence: 99%

See 2 more Smart Citations

A Review of Progress and Applications of Pulsed Doppler Wind LiDARs

et al. 2019

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Doppler wind LiDAR (Light Detection And Ranging) makes use of the principle of optical Doppler shift between the reference and backscattered radiations to measure radial velocities at distances up to several kilometers above the ground. Such instruments promise some advantages, including its large scan volume, movability and provision of 3-dimensional wind measurements, as well as its relatively higher temporal and spatial resolution comparing with other measurement devices. In recent decades, Doppler LiDARs developed by scientific institutes and commercial companies have been well adopted in several real-life applications. Doppler LiDARs are installed in about a dozen airports to study aircraft-induced vortices and detect wind shears. In the wind energy industry, the Doppler LiDAR technique provides a promising alternative to in-situ techniques in wind energy assessment, turbine wake analysis and turbine control. Doppler LiDARs have also been applied in meteorological studies, such as observing boundary layers and tracking tropical cyclones. These applications demonstrate the capability of Doppler LiDARs for measuring backscatter coefficients and wind profiles. In addition, Doppler LiDAR measurements show considerable potential for validating and improving numerical models. It is expected that future development of the Doppler LiDAR technique and data processing algorithms will provide accurate measurements with high spatial and temporal resolutions under different environmental conditions.

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Section: Aircraft Wake Vortexsupporting

confidence: 63%

Section: Aircraft Wake Vortexmentioning

confidence: 99%

Section: Aircraft Wake Vortexmentioning

confidence: 99%

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A Review of Progress and Applications of Pulsed Doppler Wind LiDARs

et al. 2019

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“…The coherent Doppler lidar (CDL) basically performs wind measurements by detecting Doppler shift of the backscattered light excited by atmospheric aerosols, retrieving the line-ofsight (LOS) velocity and eventually obtaining atmospheric wind field by three-dimensional components (Reitebuch 2012;Schwiesow et al 1985Schwiesow et al , 1983Weitkamp 2006;Wu et al 2016). It is widely used for wind field measurements and atmospheric dynamics investigations (Reitebuch 2012;Reitebuch et al 2001;Smalikho 2003;Smalikho and Banakh 2017;Zhai et al 2017Zhai et al , 2018.…”

Section: Introductionmentioning

confidence: 99%

Calibration and Retrieval of Aerosol Optical Properties Measured with Coherent Doppler Lidar

Dai

Sun

et al. 2021

Journal of Atmospheric and Oceanic Technology

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A practical method for instrumental calibration and aerosol optical properties retrieval based on Coherent Doppler Lidar (CDL) and sun-photometer is presented in this paper. To verify its feasibility and accuracy, this method is applied into three field experiments in 2019 and 2020. In this method, multi-wavelength (440 nm, 670 nm, 870 nm and 1020 nm) Aerosol Optical Depth (AOD) from sun-photometer measurements are used to estimate AOD at 1550 nm and calibrate integrated CDL backscatter signal. Then, it is validated by comparing the retrieved calibrated AOD at 1550 nm from CDL signal and that from sun-photometer measurements. Well agreement between them with the correlation of 0.96, the RMSE of 0.0085 and the mean relative error of 22% is found. From the comparison results of these three experiments, sun-photometer is verified to be an effective reference instrument for the calibration of CDL return signal and the aerosol optical properties measurement with CDL is feasible. It is expected to promote the study on the aerosol flux and transport mechanism in the planetary boundary layer with the widely deployed CDLs.

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“…Coherent Doppler lidar (CDL) has been developed as a powerful tool for atmospheric wind velocity measurement, [1][2][3][4] aircraft wake-vortex hazard detection, [5][6][7] and wind turbulence measurement 8,9 with high temporal space resolution and high measurement accuracy due to its high carrier-to-noise detecting characteristics. The enabling modules for high-performance CDL system include laser transmitter, [10][11][12] balanced detection, 13,14 and weak-regime wind estimation algorithm.…”

Section: Introductionmentioning

confidence: 99%

Performance validation on an all-fiber 1.54-μm pulsed coherent Doppler lidar for wind-profile measurement

et al. 2020

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Performance validation on an all-fiber 1.54-μm pulsed coherent Doppler lidar for wind-profile measurement,"Abstract. The characteristics and capability of a homemade all-fiber 1.54-μm pulsed coherent Doppler lidar (CDL) were validated in field experiments by comparing the detection results with a collocated lidar and sounding balloons. With the range gate of 30 m and temporal resolution of 16 s at velocity-azimuth display mode, the detection capability of the CDL ranged from 0.1 to 5 km, and the time sequence and height position of this CDL were calibrated by the collocated lidar. In the intercomparison experiments with sounding balloons, the discrepancy of 30-s averaged measurement results of horizontal wind speed and wind direction was nearly 0.7 m∕s and 5.3 deg, respectively. The good agreement achieved in such a short averaged time period was a convincing case of intercomparison experiments between CDL and sounding balloon. The CDL system demonstrated good reliability and operational stability in field experiments.

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Aircraft wake vortex and turbulence measurement under near-ground effect using coherent Doppler lidar

Cited by 40 publications

References 30 publications

A Review of Progress and Applications of Pulsed Doppler Wind LiDARs

A Review of Progress and Applications of Pulsed Doppler Wind LiDARs

Calibration and Retrieval of Aerosol Optical Properties Measured with Coherent Doppler Lidar

Performance validation on an all-fiber 1.54-μm pulsed coherent Doppler lidar for wind-profile measurement

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