Effect of coherent Doppler lidar pulse shape on the performance of maximum likelihood discrete spectral peak estimation

2021 ◽  
Author(s):  
Xuyang Jing ◽  
Xianglong Hao ◽  
Ran Song ◽  
Chi Wu
Keyword(s):  
Maximum Likelihood ◽  
Pulse Shape ◽  
Spectral Peak ◽  
Doppler Lidar ◽  
Coherent Doppler Lidar

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.

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 Low-Level Wind Shear Identification along the Glide Path at BCIA by the Pulsed Coherent Doppler Lidar

Atmosphere ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 50
Author(s):  
Hongwei Zhang ◽  
Xiaoying Liu ◽  
Qichao Wang ◽  
Jianjun Zhang ◽  
Zhiqiang He ◽  
...  
Keyword(s):  
Wind Shear ◽  
Vertical Direction ◽  
Small Scale ◽  
Observation Data ◽  
Doppler Lidar ◽  
Low Level ◽  
Glide Path ◽  
Coherent Doppler Lidar ◽  
Scanning Strategies ◽  
Meteorological Phenomenon

Low-level wind shear is usually to be a rapidly changing meteorological phenomenon that cannot be ignored in aviation security service by affecting the air speed of landing and take-off aircrafts. The lidar team in Ocean University of China (OUC) carried out the long term particular researches on the low-level wind shear identification and regional wind shear inducement search at Beijing Capital International Airport (BCIA) from 2015 to 2020 by operating several pulsed coherent Doppler lidar (PCDL) systems. On account of the improved glide path scanning strategy and virtual multiple wind anemometers based on the rang height indicator (RHI) modes, the small-scale meteorological phenomenon along the glide path and/or runway center line direction can be captured. In this paper, the device configuration, scanning strategies, and results of the observation data are proposed. The algorithms to identify the low-level wind shear based on the reconstructed headwind profiles data have been tested and proved based on the lidar data obtained from December 2018 to January 2019. High spatial resolution observation data at vertical direction are utilized to study the regional wind shear inducement at the 36L end of BCIA under strong northwest wind conditions.

Compact all-fiber pulsed coherent Doppler lidar system for wind sensing

2007 ◽  
Vol 46 (11) ◽  
pp. 1953 ◽  
Author(s):  
S. Kameyama ◽  
T. Ando ◽  
K. Asaka ◽  
Y. Hirano ◽  
S. Wadaka
Keyword(s):  
Doppler Lidar ◽  
Lidar System ◽  
Coherent Doppler Lidar
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