Results 21 to 30 of about 8,875 (115)

Comparison of CML Rainfall Data against Rain Gauges and Disdrometers in a Mountainous Environment

Sensors, 2022
Despite the several sources of inaccuracy, commercial microwave links (CML) have been recently exploited to estimate the average rainfall intensity along the radio path from signal attenuation.
Roberto Nebuloni, Greta Cazzaniga, Michele D’Amico, Cristina Deidda, Carlo De Michele   +4 more
doaj   +1 more source

Microwave harmonic generation in fiber-optical links

Journal of Telecommunications and Information Technology, 2002
Optical transmission of microwave (MW) and millimeter-wave (MMW) signals has become an intensive research area in the last decade. There is a growing interest in optical processing of MW signals [1, 2], phased array applications [3] and wireless ...
Attila Hilt
doaj   +1 more source

Low-loss microwave photonics links using hollow core fibres

Light: Science & Applications, 2022
We demonstrate analogue photonics links using hollow-core fibres, showing they significantly surpass the performance of standard fibre analogue links in every metrics of link gain, noise figure, and dynamic range.
Xi Zhang, Zitong Feng, David Marpaung, Eric Numkam Fokoua, Hesham Sakr, John Richard Hayes, Francesco Poletti, David John Richardson, Radan Slavík   +8 more
doaj   +1 more source

Microwave Frequency Dissemination over a 250 km Fiber Link with Stability at the 10⁻¹⁸ Level

Photonics, 2023
In this paper, a microwave phase compensation scheme is adopted. It utilizes microwave signals of different frequencies for round-trip signal transmission over a 250 km fiber optic link to mitigate the impact of parasitic reflections.
Shaoshao Yu, Wenyu Zhao, Wenxiang Xue, Shougang Zhang   +3 more
doaj   +1 more source

Measuring rainfall using microwave links: the influence of temporal sampling [PDF]

Atmospheric Measurement Techniques
Terrestrial microwave links are increasingly being used to estimate path-averaged precipitation by determining the attenuation caused by rainfall along the link path, mostly with commercial microwave links from cellular telecommunication networks ...
L. D. van der Valk, M. Coenders-Gerrits, R. W. Hut, A. Overeem, A. Overeem, B. Walraven, R. Uijlenhoet   +6 more
doaj   +1 more source

Microwave Photonic Links and Transversal Microwave Photonic Applications

Electromagnetic Science
With the help of photonic techniques, microwave photonic links (MPLs) have remarkable advantages in terms of generating, transmitting, and processing analog or microwave signals with high frequency or wide bandwidth relative to traditional electrical ...
Yunping Bai, Zhihui Liu, Mengmeng Duan, Jiaxue Feng, Xixi Xiong, Kelei Wei, Kainan Wu, Xiyao Jia, Ruilin Liao, Yuhang Song, Edwin Yue Bun Pun, Sha Zhu, Xingyuan Xu, Ning Hua Zhu, Kun Xu   +14 more
doaj   +1 more source

First Daily Mapping of Surface Moisture from Cellular Network Data and Comparison with Both Observations/ECMWF Product

Geophysical Research Letters, 2018
Air‐moisture maps were generated based on commercial microwave links data over N. Israel and compared for the first time to European Centre for Medium‐Range Weather Forecasts (ECMWF) ERA‐Interim maps for April 2017.
P. Alpert, Y. Rubin
doaj   +1 more source

Low complexity single-layer neural network for enhanced rainfall estimation using microwave links

Journal of Hydroinformatics, 2023
A low complexity accurate model for precipitation estimation is crucial for monitoring several hydrological and water resource applications. Based on the R-k empirical power-law relation described by the P.838-3 ITU recommendation, rainfall rate can be ...
Ali Daher, Hassan Al Sakka, Alain Khaled Chaaban   +2 more
doaj   +1 more source

Estimating raindrop size distributions using microwave link measurements: potential and limitations [PDF]

Atmospheric Measurement Techniques, 2020
We present a novel method of using two or three collocated microwave link instruments to estimate the three parameters of a gamma raindrop size distribution (DSD) model.
T. C. van Leth, H. Leijnse, A. Overeem, A. Overeem, R. Uijlenhoet   +4 more
doaj   +1 more source

Experimental Study of Detecting Rainfall Using Microwave Links: Classification of Wet and Dry Periods

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
To improve the accuracy of rainfall estimation by microwave links, this article presents a method for classifying wet and dry periods based on the support vector machine (SVM).
Kun Song, Xichuan Liu, Mingzhong Zou, Ding Zhou, Haonan Wu, Feng Ji   +5 more
doaj   +1 more source