Results 161 to 170 of about 13,475 (217)

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

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

Estimating evaporation duct heights from radar sea echo

Radio Science, 2000
The evaporation duct is a downward refracting layer that results from the rapid decrease in humidity with respect to altitude occurring in the atmospheric surface layer above bodies of water. The evaporation duct affects radar detection ranges at frequencies of approximately 1 GHz and above.
L. Ted Rogers, Claude P. Hattan, Janet K. Stapleton   +2 more
openaire   +1 more source

Comparison of Evaporation Duct Height Statistics Based on Surface Bulk Measurements Over Yongxing Island

IEEE Antennas and Wireless Propagation Letters, 2023
Xiaofeng Zhao, Pinglv Yang, Fenghua Zhou, Zeming Zhou   +3 more
openalex   +2 more sources

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

CASPER West Evaporation Duct Height Inversion Using LATPROP-Radar

2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2018
Refractive atmospheric conditions at low altitudes can have a significant impact on electromagnetic signal propagation in many maritime environments. For air-sea interaction research, it is crucial to characterize atmosphere boundary layer properties, specifically in this work, by utilizing radar clutter returns caused by electromagnetic ducting ...
Joshua Compalec, Caglar Yardim, Luyao Xu, Shanka Wijesundara, Joel Johnson, Bob Burkholder, Tom Hanley, Tracy Haack, Qing Wang   +8 more
openaire   +1 more source

ON RELATIONSHIP BETWEEN EVAPORATION DUCT HEIGHT AND MICROWAVE ATTENUATION IN OVER-THE-HORIZON AREA

Telecommunications and Radio Engineering, 2012
Yurii V. Levadnyi, В. К. Иванов, V. N. Shalyapin   +2 more
openalex   +2 more sources

Statistical Distributions of Evaporation Duct Height and Strength Over Range and the Diurnal Cycle

2025 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)
Sarah E. Wessinger, Andrew J. Kammerer, David D. Flagg, Qingfang Jiang   +3 more
openalex   +2 more sources

PCR Model: Optimization of Evaporation Duct Height Prediction Based on Principal Component Regression

2020 IEEE 5th International Conference on Signal and Image Processing (ICSIP), 2020
Evaporation duct is an abnormal refraction atmospheric structure frequently appearing on the sea surface. Accurately obtaining the evaporation duct height (EDH) has significant effects on the effective application of electromagnetic system equipment. Aiming at the problems of large error and strong data dependence of current evaporation duct prediction
Wenpeng Zhao, Jun Zhao, Jincai Li, Tao Jiang, Dandan Zhao, Jingze Lu, Tengling Luo   +6 more
openaire   +1 more source

Retrieve the evaporation duct height by least-squares support vector machine algorithm

Journal of Applied Remote Sensing, 2009
The detection and tracking of naval targets, including low Radar Cross Section (RCS) objects like inflatable boats or sea skimming missiles 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.
Bourlier, Christophe, Essen, H., Fuchs, H.-H., Saillard, Joseph, Douvenot, Rémi, Fabbro, Vincent, Foerster, Joerg   +6 more
openaire   +3 more sources