Results 131 to 140 of about 492 (181)
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Measuring the Atmospheric Boundary Layer Parameters With a Coherent Doppler Lidar
Russian Meteorology and Hydrology, 2022Coherent Doppler lidars are traditionally used to measure wind speed in the atmospheric boundary layer. However, in addition to wind speed data, coherent Doppler lidars are a source of information on the distribution of the aerosol particle concentration in the atmosphere, which makes it possible to measure the height of the planetary boundary layer ...
Maxim Konyaev
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Coherent Doppler Lidar Measurements of Winds in the Weak Signal Regime
Applied Optics, 1997In the weak signal regime coherent Doppler lidar velocity estimates are characterized by a localized distribution around the true mean velocity and a uniform distribution of random outliers over the velocity search space. The performance of velocity estimators is defined by the standard deviation of the good estimates around the true mean velocity and ...
Rod Frehlich, S W Henderson, R Frehlich
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Optical single-sideband modulation for a coherent Doppler lidar
Optics Letters, 2022The first, to the best of our knowledge, implementation of optical single-sideband modulation (OSSBM) in coherent Doppler lidar (CDL) is demonstrated for use with short pulse widths. It is shown that by providing more bandwidth through a higher intermediate frequency (IF), the OSSBM CDL addresses cross talk between the IF and baseband spectra, reducing
Sean Wolfe +3 more
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Calibration of the reflectance of hard targets for a coherent Doppler lidar
Applied Optics, 1987During the summer of 1986 some preliminary experiments were performed to measure the reflectivity of hard targets used to calibrate a coherent Doppler lidar. The experiments were performed in an integrating sphere with the sample uniformly and normally irradiated. In this way both bihemispherical and directional-hemispherical reflectance were measured.
R, Anderson, J W, Bilbro
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All-fiber coherent Doppler lidar
SPIE Proceedings, 2016The paper sums up the principles of construction of all-fiber Doppler coherent wind lidars, which can be divided into two classes by the method of signal conversion: homodyne and heterodyne. Lidars of the first class, usually, with continuous-wave probing radiation employ the direct conversion of the signal, when the carrier frequency coincides with ...
V. A. Banakh, I. A. Razenkov
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Velocity retrieval for coherent Doppler lidar
International Journal of Remote Sensing, 2012Coherent Doppler light detection and ranging (lidar) measures a component of atmospheric wind motion in the direction of the lidar beam. However, velocity vectors are needed in order to obtain more complete knowledge of flow fields in the atmospheric boundary layer (ABL).
Shantanu Kongara +3 more
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Development of coherent Doppler lidar at CRL
SPIE Proceedings, 2003Global wind profiling with a space-borne Doppler lidar is expected to bring big progress in the studies on global climate change and Numerical Weather Prediction. A feasibility study has been done for an eye-safe 2micron coherent Doppler lidar aiming at demonstration of the technology onboard the Japanese Experiment module of the International Space ...
Kohei Mizutani +6 more
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Characterization of pulsed coherent Doppler LIDAR with the speckle effect
Applied Optics, 1994The relationships among heterodyne efficiency γ, number of speckle cells M, and the ratio of receiver area to coherence area S(R)/S(C) for a pulsed coherent laser radar (CLR) are written through the use of mutual coherence functions. It is shown that numerical values for S(R)/S(C) that follow Goodman's definition [J. W.
A, Dabas, P H, Flamant, P, Salamitou
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Coherent Doppler Lidar Using Optical Single Sideband Modulation
2022 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2022This paper presents the first implementation of Coherent Doppler LiDAR using an Optical Single Sideband Modulator. Experiments show that range resolution and Doppler shift estimates are greatly improved over the traditionally used AOM.
Sean Wolfe +3 more
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Coherent Doppler lidar signal spectrum with wind turbulence
Applied Optics, 1999The 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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