Results 11 to 20 of about 928,348 (261)

Atmospheric turbulence forecasting using two-stage variational mode decomposition and autoregression towards free-space optical data-transmission link

Frontiers in Physics, 2022
Free space optical communication (FSOC) is a promising technology for satellite-to-earth communication systems, where vector beams, especially orbital angular momentum (OAM), can further increase the capacity of the optical link.
Yalin Li, Lang Li, Lang Li, Lang Li, Yingchi Guo, Yingchi Guo, Yingchi Guo, Hongqun Zhang, Shiyao Fu, Shiyao Fu, Shiyao Fu, Chunqing Gao, Chunqing Gao, Chunqing Gao, Ci Yin   +14 more
doaj   +1 more source

Beam Properties of a Partially Coherent Beam Propagating Horizontally in Atmospheric Turbulence

Photonics, 2023
This study explored the impact of atmospheric turbulence on partially coherent light propagation. Atmospheric turbulence causes random modulation of the intensity and phase of light, resulting in a speckle pattern in the far field.
Zengyan Wu, Zhejun Feng, Shubing Ye, Baoming Song, Runxi Wei, Chaoran Yu   +5 more
doaj   +1 more source

Propagation Properties of an Astigmatic Cos-Gaussian Beam through Turbulent Atmosphere [PDF]

E3S Web of Conferences, 2021
We use the extended Huygens-Fresnel integral to investigate the propagation properties of a cos-Gaussian beam (cosGB) with astigmatism in atmospheric turbulence.
Zhu Kaicheng, Ma Xiaolei, Gao Chang, Ren Dengjuan, Zhu Jie   +4 more
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Evaluating time domain reflectometry and coaxial impedance sensors for soil observations by the U.S. Climate Reference Network

Vadose Zone Journal, 2020
The objective of this study was to evaluate the performance of two commercial‐grade electromagnetic sensors in measuring soil water content for the U.S. Climate Reference Network (USCRN). One sensor was a 50‐MHz coaxial impedance dielectric sensor (model
Timothy B. Wilson, Howard J. Diamond, John Kochendorfer, Tilden P. Meyers, Mark Hall, Nancy W. Casey, C. Bruce Baker, Ronald Leeper, Michael A. Palecki   +8 more
doaj   +1 more source

The effect of atmospheric turbulence on the performance of the free space optical communications [PDF]

, 2008
In free space optical (FSO) communication links, atmospheric turbulence has a significant impact on the quality of a laser beam propagating through the atmosphere.
Ghassemlooy, Zabih, A. Chaman Motlagh, Z. Ghassemlooy, Ahmadi, Vahid, Chaman Motlagh, Abolfazl, V. Ahmadi, Abedi, Kambiz, K. Abedi   +7 more
core   +1 more source

Ergodicity test of the eddy-covariance technique [PDF]

Atmospheric Chemistry and Physics, 2015
The ergodic hypothesis is a basic hypothesis typically invoked in atmospheric surface layer (ASL) experiments. The ergodic theorem of stationary random processes is introduced to analyse and verify the ergodicity of atmospheric turbulence measured using ...
J. Chen, Y. Hu, Y. Yu, S. Lü
doaj   +1 more source

Effects of Atmospheric Coherent Time on Inverse Synthetic Aperture Ladar Imaging through Atmospheric Turbulence

Remote Sensing, 2023
Inverse synthetic aperture ladar (ISAL) can achieve high-resolution images for long-range moving targets, while its performance is affected by atmospheric turbulence.
Azezigul Abdukirim, Yichong Ren, Zhiwei Tao, Shiwei Liu, Yanling Li, Hanling Deng, Ruizhong Rao   +6 more
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Performance of BPSK subcarrier intensity modulation free-space optical communications using a log-normal atmospheric turbulence model [PDF]

, 2010
In this paper, we present simulation results for the bit error rate (BER) performance and the fading penalty of a BPSK - subcarrier intensity modulation (BPSK-SIM) free-space optical (FSO) communication link in a log-normal atmospheric turbulence model ...
S. S. Muhammad, Z. Ghassemlooy, E. Leitgeb, Tang, Xuan, Muhammad, Sajid Sheikh, S. Rajbhandari, Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, W. O. Popoola, Kandus, Gorazd, Leitgeb, Erich, Rajbhandari, Sujan, X. Tang, G. Kandus   +13 more
core   +1 more source

Testing and development of transfer functions for weighing precipitation gauges in WMO-SPICE [PDF]

Hydrology and Earth System Sciences, 2018
Weighing precipitation gauges are used widely for the measurement of all forms of precipitation, and are typically more accurate than tipping-bucket precipitation gauges.
J. Kochendorfer, R. Nitu, R. Nitu, M. Wolff, E. Mekis, R. Rasmussen, B. Baker, M. E. Earle, A. Reverdin, K. Wong, C. D. Smith, D. Yang, Y.-A. Roulet, T. Meyers, S. Buisan, K. Isaksen, R. Brækkan, S. Landolt, A. Jachcik   +18 more
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Correction: Lee, T. R., et al. On the Use of Rotary-Wing Aircraft to Sample Near-Surface Thermodynamic Fields: Results from Recent Field Campaigns. Sensors 2019, 19(1), 10

Sensors, 2019
The authors wish to make the following correction to this paper [...]
Temple R. Lee, Michael Buban, Edward Dumas, C. Bruce Baker   +3 more
doaj   +1 more source