Results 191 to 200 of about 12,338 (223)

Doppler lidar for tropospheric wind measurements

SPIE Proceedings, 1992
A ground-based Doppler wind lidar for tropospheric wind speed measurement is being developed for environmental applications such as pollutants distribution studies and climatology investigations preceding the choice of sites for power plants and factories. This paper gives a short overview on specifications and design concepts of the system and reports
Enrico Galletti, Emanuele S. Stucchi, Alberto Marzorati   +2 more
openaire   +1 more source

Dual-frequency Doppler-lidar method of wind measurement

Applied Optics, 1980
In this new method [dual-frequency Doppler-lidar (DFDL)] of remote wind sensing, two optical beams of unlike frequency are superimposed in the sensed volume. The velocity information is obtained from the difference in the Doppler shifts of light scattered from the two beams by aerosols moving with the air.
W L, Eberhard, R M, Schotland
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Coherent Doppler lidar signal spectrum with wind turbulence

Applied Optics, 1999
The average signal spectrum (periodogram) for coherent Doppler lidar is calculated for a turbulent wind field. Simple approximations are compared with the exact calculation. The effects of random errors in the zero velocity reference, the effects of averaging spectral estimates by use of multiple lidar pulses, and the effects of the range dependence of
R, Frehlich, L, Cornman
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Validation of wind profiles measured with incoherent Doppler lidar

Applied Optics, 1997
A high-resolution incoherent Doppler lidar has been constructed at the University of Michigan Space Physics Research Laboratory. The primary purpose of this lidar is to measure vertical profiles of the horizontal wind field with high spatial and temporal resolution. In mid-1994 a rawinsonde system was used to assess the performance of the lidar.
M J, McGill, W R, Skinner, T D, Irgang
openaire   +2 more sources

Wind Variability Measured by Doppler Lidar

Journal of Applied Meteorology, 1989
Abstract Wind power spectral density measured in the lower and middle troposphere under zonal flow conditions is consistent with a −5/3 slope to frequencies as high as 10−2 Hz. By conversion of frequency to a spatial coordinate it is found that a satellite-borne lidar when averaging such winds over a 300 km grid scale would measure the synoptic-scale ...
openaire   +1 more source

Simulation of wind profiles from a space-borne Doppler wind lidar

Quarterly Journal of the Royal Meteorological Society, 2003
AbstractThe importance of wind observations for meteorological analysis has been recognized for many years. The current global observing system lacks a uniform distribution of tropospheric wind measurements, especially in the tropics and southern hemisphere, and over the northern‐hemisphere oceans.
G. J. Marseille, A. Stoffelen
openaire   +1 more source

The Doppler Wind and Temperature System of the Alomar Lidar

Conference on Lasers and Electro-Optics Europe, 1996
The Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR) at Andoya, Norway (69° N. 16°E. von Zahn and Rees, 1994), is a complex multi-instrument facility using lidars, radars and passive IR and Visible-wavelength instruments to study the complex behaviour of the Arctic Stratosphere and Mesosphere (von Cossart et al 1995).
D. Rees, M. Vyssogorets, P-E Nilsen, I. Gandham, David Rees   +4 more
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Intercomparison of Doppler Wind Lidar Velocity Measurements

Optical Remote Sensing, 2003
Three collocated Doppler Wind Lidars (DWLs) were used to measure winds during a demonstration campaign in New Hampshire September 2000. Corresponding line-of-sight (LOS) velocities determined by pairs of DWLs realized good agreement under clear sky conditions with random differences that increase as a function of decreasing signal strength.
M.K. Rama Varma Raja, James G. Yoe, R. Michael Hardesty, W. Allen Brewer, Berrien Moore, James Ryan, Paul Hays, Carl Nardell, Bruce Gentry, Michelle Day, Kenneth Rancourt   +10 more
openaire   +1 more source

Measurement of a wind field with an airborne continuous-wave Doppler lidar

Optics Letters, 1995
An airborne homodyne conical scanning Doppler lidar for the measurement of a wind field has been built and was operated in a first test flight in May 1994. The design of the optic is described, and the single steps of the signal-processing chain to calculate an average wind are discussed. The results of a flight over Lake Ammersee are presented and are
openaire   +3 more sources

Airborne Doppler Lidar Wind Field Measurements

Topical Meeting on Optical Remote Sensing of the Atmosphere, 1985
Pulsed and continous-wave coherent lidar are being used in airborne measurements to determine mesoscale wind fields and atmospheric backscatter. This paper describes recent measurements as well as future plans.
openaire   +1 more source