scholarly journals DIPOLE ANTENNA WITH CIRCULAR RADIATION PATTERN IN THE E-PLANE FOR VALIDATION THE INTEGRITY OF THE AIRCRAFT LANDING SYSTEMS INFORMATION

2020 ◽  
Vol 20 (4) ◽  
pp. 31-43
Author(s):  
V.V. Voitovich ◽  
◽  
Yu.V. Petrash ◽  
M.M. Belousov ◽  
E.M. Yungaitis ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Unmanned Aerial Vehicle ◽  
Free Space ◽  
Horizontal Plane ◽  
Dipole Antenna ◽  
Practical Implementation ◽  
Horizontal Polarization ◽  
Aircraft Landing ◽  
Minimum Number ◽  
Aerial Vehicle

The paper presents the results of studies of an omnidirectional dipole antenna designed for installation on an unmanned aerial vehicle of the mini-UAV category. The antenna forms a cir-cular radiation pattern in the horizontal plane with horizontal polarization of the radiated field. Irregularity of the radiation pattern of the antenna under study in free space in the horizontal plane is ±0.2 dB. The antenna contains a minimum number of elements of the feeder path. It has convenient for practical implementation design

Investigation of Shielding Materials Impact on the Effectiveness of UAV FSO Communication Systems

2014 ◽  
Vol 792 ◽  
pp. 311-315 ◽  
Author(s):  
Antonios Hatziefremidis ◽  
Vassilios Spathopoulos ◽  
Eleftherios I. Amoiralis ◽  
Marina A. Tsili
Keyword(s):  
Real Time ◽  
Unmanned Aerial Vehicle ◽  
Free Space ◽  
Communication Systems ◽  
Free Space Optics ◽  
Space Optics ◽  
Aerial Vehicle ◽  
The Relationship

The use of Free Space Optics (FSO) for Unmanned Aerial Vehicle (UAV) communication is a relatively new innovation that could become a necessity for all scenarios where real-time delivery of high daterates is essential. The present paper investigates one of the challenges being faced by this type of system, in particular the relationship between shielding materials of the protective dome and the wavelength of the emitted photons.

scholarly journals Revisiting the digital noise reduction in automatic contouring of “ice-water” objects

2020 ◽  
Vol 66 (1) ◽  
pp. 102-114
Author(s):  
K. N. Zvyagin ◽  
D. D. Maltsev
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Aerial Photography ◽  
Noise Suppression ◽  
Structural Features ◽  
Image Noise ◽  
Practical Implementation ◽  
Haar Wavelet Transform ◽  
Northern Sea Route ◽  
Aerial Vehicle ◽  
Ice Water

This work describes the practical implementation of the method for digital noise suppression during processing images containing ice information to recognize automatically the contours of «ice-water» objects during aerial photography. Images containing ice information have special characteristic structural features related to noise, e.g.granularity, glare, ice crumbs. This makes difficult or even impossible to recognize automatically the contours of ice-water objects. It is known that the success of the application of edge recognition methods depends on how much image noise is reduced. The paper discusses the construction method for the management of noise. The method is based on the sequential application of the Haar wavelet transform denoising using thresholding, clustering by k-means method. For the subsequent automatic construction of ice floes contours the Sobel operator is applied.The aim of the work is to develop a method capable to process digital images effectively that contain ice information with strong digital noise. In this work we treated the images of one-year ice containing strong digital image noise in the form of granularity and in the form of ice crumbs. A description of the features of each of the steps of the proposed method and practical application is given.As a result, the method was developed for processing images of ice information containing digital noise in absolute value commensurate with the basic data. It was noted that the use of the k-means method expands the scope. The k-rare method allows more detailed processing of ice information and distinguishes not only the contours of ice-water objects, but also the contours of ice crumbs.The conclusion formulates the main advantages of the method and the possible application of the algorithm in the process of local exploration of the ice conditions of the Northern Sea Route channel using unmanned aerial vehicle for aerial photography. The usage of unmanned aerial vehicle for aerial photography will increase the frequency of weather forecast updates and predict the appearance of ice objects at the ship’s heading. That will allow us to select the safest and most economical efficient route along the Northern Sea Route.The authors have no competing interests.

Modeling of Wing Flapping Motion

2016 ◽  
Vol 842 ◽  
pp. 132-140
Author(s):  
Tien Dat Nguyen ◽  
Subhan Sdywaliva ◽  
Taufiq Mulyanto
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Horizontal Plane ◽  
Vertical Plane ◽  
Degree Of Freedom ◽  
Pitching Motion ◽  
Flapping Motion ◽  
Aerial Vehicle ◽  
Animal World

In flying animal world, there are different flapping motions to produce lift and thrust depending on their species and size. Recent development in Unmanned Aerial Vehicle had tried to mimic flying animal. Rather than having two separate systems in providing lift and thrust, the wing upstroke and downstroke movement combined with wing twisting produce the necessary lift and thrust. Insects and some small birds have even the ability to fly hover.The present study is focused on the modeling of wing flapping motion. Instead of only accommodating flapping motion in a vertical plane and spanwise pitching motion, the model permits to include wing lead-lag motion in the horizontal plane. This more degree of freedom permit to model more complex wing flapping motion.

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