Results 141 to 150 of about 1,162 (172)

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

The short-term forecasting of evaporation duct height (EDH) based on ARIMA model

Multimedia Tools and Applications, 2016
The short-term prediction of EDH time series plays an exceedingly important role in several fields such as communications, navigation and so on. In this paper, an application of autoregressive integrated moving average (ARIMA) for short-term forecasting of EDH time series is presented.
Shaobo Yang, Sihui Liu, Xingfei Li, Ying Zhong, Xin He, Chao Wu   +5 more
openaire   +1 more source

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)
Qingfang Jiang
exaly   +2 more sources

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

X-band beacon-receiver array evaporation duct height estimation

2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015
Radiowave propagation in the marine atmospheric boundary layer (MABL) remains a subject of research interest given the potential utility of the ducting propagation mechanism. Ducting propagation is highly dependent on atmospheric conditions; experiments that combine propagation measurements with detailed atmospheric characterization can offer ...
Jonathan Pozderac, Joel Johnson, Caglar Yardim   +2 more
openaire   +1 more source

The Surface Evaporative Duct Height Product: An Evaluation

1987
Abstract : The existence of a surface evaporative duct has many serious operational implications. One of the most serious and obvious implications is that the extended range of the radar will allow distant hostile units to detect the radar(and to be detected by the radar).
openaire   +1 more source

A simple method to determine evaporation duct height in the sea surface boundary layer

Radio Science, 1992
A formulation to determine the evaporation duct height in the sea surface boundary layer is presented. This formulation is based upon the theory of similarity of Monin Obukhov by using analytical solutions currently used in the field of numerical weather prediction.
Luc Musson‐Genon, Sylvie Gauthier, Eric Bruth   +2 more
openaire   +1 more source

On analyzing space-time distribution of evaporation duct height over the global ocean

Acta Oceanologica Sinica, 2016
The statistical features of the evaporation duct over the global ocean were comprehensively investigated with reanalysis data sets from the National Centers for Environmental Prediction. These data sets have time and spatial resolutions of 1 h and 0.313°×0.312°, respectively.
Kunde Yang, Qi Zhang, Yang Shi, Zhengyao He, Bo Lei, Yina Han   +5 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

A Short-term Evaporation Duct Height Prediction Method Using EMD and Parameter Optimized SVR

2020 IEEE International Conference on Systems, Man, and Cybernetics (SMC), 2020
Evaporation duct often appears in the near ground layer close to the sea surface, and it is an important factor affecting the performance of shore based, ship borne or low altitude airborne radar and communication systems. Mastering the information of evaporation duct in advance can effectively avoid the electromagnetic wave loss caused by the ...
Shuai Zhao, Meng Zhang, Qingjian Ni, Yanbo Mai, Yuhui Wang 0002, Chenxin Shen   +5 more
openaire   +1 more source