Preliminary set of analysis for the assessment of wind turbines which are in the line‐of‐sight of radar, navigation and communications systems

2014 ◽  
Vol 8 (5) ◽  
pp. 415-424 ◽  
Author(s):  
Ug˘ur Saynak ◽  
S¸amil Karahan ◽  
Ahmet Faruk Coşkun ◽  
Senem Makal Yücedağ ◽  
Sultan Aldırmaz ◽  
...  
Keyword(s):  
Wind Turbines ◽  
Line Of Sight ◽  
Communications Systems ◽  
Radar Navigation

scholarly journals IRS-Assisted UAV Communications with Imperfect Phase Compensation

2020 ◽  
Author(s):  
Arafat Al-Dweik ◽  
MOHAMMAD AHMAD Al-Jarrah ◽  
Emad Alsusa ◽  
Mohamed-Slim Alouini ◽  
Youssef Iraqi
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Channel Model ◽  
Phase Error ◽  
Propagation Path ◽  
Line Of Sight ◽  
Rician Fading ◽  
Phase Compensation ◽  
Communications Systems ◽  
Von Mises ◽  
Reflecting Surfaces

<div>This work presents a performance analysis on unmanned aerial vehicles (UAVs) assisted wireless</div><div>communications systems, where one of the UAVs supports intelligent reflecting surfaces (IRS). As the</div><div>estimation and compensation of the end-to-end phase for each propagation path is prone to errors, imperfect</div><div>phase compensation at the IRS is taken into consideration. The performance is derived in terms of symbol</div><div>error rate (SER) and outage probability, where the phase error is modeled using the von Mises distribution.</div><div>The air-to-air (A2A) channel for</div><div>each propagation path is modeled as a single dominant line-of-sight (LoS) component, and the results are</div><div>compared to the Rician channel model. The obtained results reveal that the considered A2A model can be</div><div>used to accurately represent the A2A channel with Rician fading.</div>

scholarly journals IRS-Assisted UAV Communications with Imperfect Phase Compensation

2020 ◽  
Author(s):  
Arafat Al-Dweik ◽  
MOHAMMAD AHMAD Al-Jarrah ◽  
Emad Alsusa ◽  
Mohamed-Slim Alouini ◽  
Youssef Iraqi
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Channel Model ◽  
Phase Error ◽  
Propagation Path ◽  
Line Of Sight ◽  
Rician Fading ◽  
Phase Compensation ◽  
Communications Systems ◽  
Von Mises ◽  
Reflecting Surfaces

<div>This work presents a performance analysis on unmanned aerial vehicles (UAVs) assisted wireless</div><div>communications systems, where one of the UAVs supports intelligent reflecting surfaces (IRS). As the</div><div>estimation and compensation of the end-to-end phase for each propagation path is prone to errors, imperfect</div><div>phase compensation at the IRS is taken into consideration. The performance is derived in terms of symbol</div><div>error rate (SER) and outage probability, where the phase error is modeled using the von Mises distribution.</div><div>The air-to-air (A2A) channel for</div><div>each propagation path is modeled as a single dominant line-of-sight (LoS) component, and the results are</div><div>compared to the Rician channel model. The obtained results reveal that the considered A2A model can be</div><div>used to accurately represent the A2A channel with Rician fading.</div>

Variation of the amount of hydrogen along the galactic ridge

1967 ◽  
Vol 31 ◽  
pp. 171-172
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Surface Brightness ◽  
Milky Way ◽  
Neutral Hydrogen ◽  
Line Of Sight ◽  
Optical Surface ◽  
Hydrogen Density ◽  
Continuous Radiation ◽  
Galactic Longitude

The integralNHof neutral-hydrogen density along the line of sight is determined from the Kootwijk and Sydney surveys. The run ofNHwith galactic longitude agrees well with that of thermal continuous radiation and that of the optical surface brightness of the Milky Way.

Structuring, Motions and Shapes of Corona Emission Line Profiles

1994 ◽  
Vol 144 ◽  
pp. 421-426
Author(s):  
N. F. Tyagun
Keyword(s):  
Emission Line ◽  
Filling Factor ◽  
Direct Relationship ◽  
Coronal Plasma ◽  
Line Of Sight ◽  
Line Profiles ◽  
The Difference ◽  
Yellow Line ◽  
Red Line

AbstractThe interrelationship of half-widths and intensities for the red, green and yellow lines is considered. This is a direct relationship for the green and yellow line and an inverse one for the red line. The difference in the relationships of half-widths and intensities for different lines appears to be due to substantially dissimilar structuring and to a set of line-of-sight motions in ”hot“ and ”cold“ corona regions.When diagnosing the coronal plasma, one cannot neglect the filling factor - each line has such a factor of its own.

HUMAN LIMITATIONS OF LINE OF SIGHT MISSILES DURING LIMITED VISIBILITY.

1968 ◽  
Author(s):  
ANDREW J. ECKLES ◽  
THOMAS A. GARRY ◽  
WILLIAM C. MULLEN
Keyword(s):  
Line Of Sight ◽  
Limited Visibility

Development of the algorithm for the selection of a wind generator-based autonomous power supply system

2019 ◽  
Vol 2 (1) ◽  
pp. 8-16 ◽  
Author(s):  
P. A. Khlyupin ◽  
G. N. Ispulaeva
Keyword(s):  
Wind Turbines ◽  
Power Supply ◽  
Alternative Energy ◽  
Power Supply System ◽  
Supply System ◽  
Power Generators ◽  
Energy Devices ◽  
Wind Generator ◽  
Alternative Energy Sources ◽  
Selection Of

Introduction: The co-authors provide an overview of the main types of wind turbines and power generators installed into wind energy devices, as well as advanced technological solutions. The co-authors have identified the principal strengths and weaknesses of existing wind power generators, if applied as alternative energy sources. The co-authors have proven the need to develop an algorithm for the selection of a wind generator-based autonomous power supply system in the course of designing windmill farms in Russia. Methods: The co-authors have analyzed several types of wind turbines and power generators. Results and discussions: The algorithm for the selection of a wind generator-based autonomous power supply system is presented as a first approximation. Conclusion: The emerging algorithm enables designers to develop an effective wind generator-based autonomous power supply system.

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