Results 131 to 140 of about 1,162 (172)

Periodicity as a Universal Measurand Enabling Traceable Nanoscale Dimensional Metrology

Lupi FF, Murataj I, Altmann K, Arslan BG, Baruffaldi D, Boarino L, Bortolini C, Bozat O, Buajarern J, Cara E, Celano U, Chen H, Ciesielski R, Clifford C, Chiarcos R, De Wolf P, Giovannozzi A, Gollwitzer C, Grazianetti C, Kim DK, Klapetek P, Kline RJ, Laus M, Lin F, Marini M, Martella C, Menghini M, Caligaris FO, Pedraz P, Singh S, Singh SP, Soltwisch V, Su C, Su C, Tawale JS, Torre B, Valtr M, Vladar A, Wood S, Cabral V, Milano G.   +40 more
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The influence of antenna height on microwave propagation in evaporation duct

Global Oceans 2020: Singapore – U.S. Gulf Coast, 2020
In this paper, the influence of antenna height on microwave propagation in evaporation duct is investigated, both from numerical simulation and experimental observation. Comparisons of microwave propagation with different antenna heights under different conditions, such as different evaporation duct heights (EDHs) and signal frequencies, are presented.
Yang Shi, Kunde Yang, Shuwen Wang
exaly   +2 more sources

An Evaporation Duct Height Prediction Method Based on Deep Learning

IEEE Geoscience and Remote Sensing Letters, 2018
An evaporation duct is a particular atmospheric duct that is crucial for marine vessel communication, and one of the most significant indexes to assess it is evaporation duct height (EDH). In this letter, we propose a new method based on a multilayer perceptron (MLP), a classic network in deep learning, to predict the EDH.
Yinglun Li, Xiaoyu Zhu, Jincai Li
exaly   +2 more sources

A Passive Technique to Monitor Evaporation Duct Height Using Coastal GNSS-R

IEEE Geoscience and Remote Sensing Letters, 2011
We report on a coastal experiment to monitor evaporation duct height (EDH) using GPS-L1 signals scattered from the sea surface. The campaign was carried out in the South China Sea and was focused on the development of an EDH inversion technique. A high-sensitivity delay-mapping receiver was built for this purpose to collect and process direct and ...
Zhao-Wei Zhao, Hong-Guang Wang
exaly   +2 more sources

A method of estimating the distribution of evaporation duct height from statistical meteorological parameters

2019 International Applied Computational Electromagnetics Society Symposium - China (ACES), 2019
To estimate the distribution of the evaporation duct height in some marine areas whose original meteorological data is not open, a calculation method from statistical meteorological parameters is presented. 10000 sets of data are randomly generated from the mean and variance of meteorological parameters firstly, then the data whose Air-Sea temperature ...
Tian Shusen, Liu Tao
exaly   +2 more sources

A Fully Coherent Array for Evaporation Duct Height Estimation at Coastal Boundaries

2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 2021
The Coherent Vertical Array (CoVA) system has been designed to be used during the Coastal Land-Air-Sea Interactions (CLASI) mission for evaporation duct height (EDH) estimation by measuring the grazing angle of the incident, ducted signal. High angular resolution and phase coherence is needed in the CoVA system due to the ducted signal having a narrow ...
Joe Vinci, Caglar Yardim, Joel T Johnson, Mark Andrews   +3 more
openaire   +1 more source

Determination of evaporation duct heights by an inverse method

SPIE Proceedings, 2007
The detection and tracking of naval targets, including low RCS objects like inflatable boats requires a thorough knowledge of the propagation properties of the maritime boundary layer. Models are in existence, which allow a prediction of the propagation factor using the parabolic equation algorithm.
R. Douvenot, V. Fabbro, C. Bourlier, J. Saillard, H.-H. Fuchs, H. Essen, J. Förster   +6 more
openaire   +1 more source

Determination of the evaporation duct height from standard meteorological data

Izvestiya, Atmospheric and Oceanic Physics, 2007
Four models used for evaluating the height of the evaporation duct from measured atmospheric pressure, water and air temperatures, and air humidity are considered.The calculated results are compared with the duct heights measured during two oceanographic expeditions in the tropical zone of the Atlantic Ocean and the equatorial zone of the Indian Ocean.
V. K. Ivanov, V. N. Shalyapin, Yu. V. Levadnyi   +2 more
openaire   +1 more source

Retrieving evaporation duct heights from measured propagation factors

IET International Conference on Radar Systems 2007, 2007
The knowledge of refractivity is very important for coverage prediction. This problem is common above sea, where the particular atmospheric conditions lead to atmospheric ducts which strongly modify the range of the radar compared to the standard atmosphere coverage. The most common duct which is almost always present is the evaporation duct.
R. Douvenot, V. Fabbro, H.H. Fuchs, H. Essen, C. Bourlier, J. Saillard, Y. Hurtaud   +6 more
openaire   +2 more sources