scholarly journals Characterization of Aircraft Wake Vortices by Airborne Coherent Doppler Lidar

2007 ◽  
Vol 44 (3) ◽  
pp. 799-805 ◽  
Author(s):  
Stephan Rahm ◽  
Igor Smalikho ◽  
Friedrich Köpp
Keyword(s):  
Doppler Lidar ◽  
Wake Vortices ◽  
Coherent Doppler Lidar ◽  
Aircraft Wake

scholarly journals Characterization of aircraft dynamic wake vortices and atmospheric turbulence by coherent doppler lidar

2018 ◽  
Vol 176 ◽  
pp. 06001 ◽  
Author(s):  
Songhua Wu ◽  
Xiaochun Zhai ◽  
Bingyi Liu ◽  
Jintao Liu
Keyword(s):  
Atmospheric Turbulence ◽  
Temporal Evolution ◽  
Ground Effect ◽  
Doppler Lidar ◽  
Wake Vortices ◽  
International Airport ◽  
Coherent Doppler Lidar ◽  
Evolution Characteristics ◽  
Key Characteristics

Field observations for the wake vortices by Coherent Doppler Lidar (CDL) have been carried out at the Beijing Capital International Airport (BCIA) and Tianjin Binhai International Airport (TBIA) to investigate the wake vortices evolution characteristics and the near-ground effect. This paper introduces the dynamic wake vortices and atmospheric turbulence monitoring technique, successfully demonstrating that the CDL can capture the key characteristics of wake vortices in real-time, including wake vortices intensity, spatial-temporal evolution and so forth.

Characterization of turbulent wake of wind turbine by coherent Doppler lidar

2014 ◽  
Author(s):  
Songhua Wu ◽  
Jiaping Yin ◽  
Bingyi Liu ◽  
Jintao Liu ◽  
Rongzhong Li ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbulent Wake ◽  
Doppler Lidar ◽  
Coherent Doppler Lidar

scholarly journals Signal to Noise Ratio Characterization of Coherent Doppler Lidar Backscattered Signals

2016 ◽  
Vol 119 ◽  
pp. 17014 ◽  
Author(s):  
Sameh Abdelazim ◽  
David Santoro ◽  
Mark Arend ◽  
Fred Moshary ◽  
Sam Ahmed
Keyword(s):  
Signal To Noise Ratio ◽  
Doppler Lidar ◽  
Signal To Noise ◽  
Coherent Doppler Lidar ◽  
Noise Ratio ◽  
Backscattered Signals

Characterization of a Coherent Doppler Lidar for Operation Onboard Aerial and Space Vehicles

2019 ◽  
Author(s):  
Farzin Amzajerdian ◽  
Glenn D. Hines ◽  
Diego F. Pierrottet ◽  
Aram Gragossian ◽  
Bruce W. Barnes ◽  
...  
Keyword(s):  
Space Vehicles ◽  
Doppler Lidar ◽  
Coherent Doppler Lidar

scholarly journals Measurement of Aircraft Wake Vortices Using Doppler LIDAR

2008 ◽  
Vol 3 (4) ◽  
pp. 488-499 ◽  
Author(s):  
Takeshi OGASAWARA ◽  
Takashi MISAKA ◽  
Toshihiro OGAWA ◽  
Shigeru OBAYASHI ◽  
Izumi YAMADA
Keyword(s):  
Doppler Lidar ◽  
Wake Vortices ◽  
Aircraft Wake

scholarly journals Maximum Likelihood Estimates of Vortex Parameters from Simulated Coherent Doppler Lidar Data

2005 ◽  
Vol 22 (2) ◽  
pp. 117-130 ◽  
Author(s):  
Rod Frehlich ◽  
Robert Sharman
Keyword(s):  
Maximum Likelihood ◽  
Pulse Repetition Frequency ◽  
Estimation Error ◽  
Standard Condition ◽  
Vortex Pair ◽  
Maximum Likelihood Estimates ◽  
Lidar Data ◽  
Doppler Lidar ◽  
Wake Vortices ◽  
Coherent Doppler Lidar

Abstract The performance of pulsed coherent Doppler lidar in estimating aircraft trailing wake vortices by scanning across the aircraft flight track is evaluated using Monte Carlo lidar simulations of a simple vortex pair in both a nonturbulent and turbulent environment. The performance estimates are based on maximum likelihood estimates of aircraft wake vortex parameters and provide a measure of the ability of the lidar to detect and track wake vortices under the best possible conditions. Two aircraft types are considered: the Boeing 737 and the Boeing 747. Rigorous error analyses are produced by comparing the estimated parameters from numerical simulations of raw lidar data with the known input parameters of the simulation. It is shown that the probability density functions for the estimates are approximately Gaussian and the bias is very small. The main source of the bias was determined to be the movement of the vortex during the lidar scan. The estimation error is increased by the effects of a background turbulent velocity field. The trade-off between lidar pulse energy and pulse repetition frequency for the standard condition of constant laser power is also presented. It is shown that these maximum likelihood estimates provide accurate detection and tracking of the key vortex parameters for a simple vortex model, with and without background turbulence.

Axial Detection of Aircraft Wake Vortices Using Doppler Lidar

2002 ◽  
Vol 39 (5) ◽  
pp. 850-861 ◽  
Author(s):  
Michael Keane ◽  
Daniel Buckton ◽  
Michael Redfern ◽  
Christoph Bollig ◽  
Carsten Wedekind ◽  
...  
Keyword(s):  
Doppler Lidar ◽  
Wake Vortices ◽  
Aircraft Wake
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