scholarly journals Variation in the Polarization Loss Factor in an Unmanned Aerial Vehicle Jamming Link Due to the Attitude Change

2021 ◽  
Vol 11 (22) ◽  
pp. 10725
Author(s):  
Kiin Kim ◽  
Chiho Lee ◽  
Hojun Kim ◽  
Kyungtae Park ◽  
Kangwook Kim
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Attitude Change ◽  
Loss Factor ◽  
Rotation Axis ◽  
Vertical Plane ◽  
Main Interest ◽  
Height Difference ◽  
Omnidirectional Antenna ◽  
Small Uav ◽  
Aerial Vehicle

A method to analyze the variation of the jamming power received by an unmanned aerial vehicle (UAV) receiver according to the change in the attitude of the small UAV is presented. The main interest of the study is in the variation of the polarization loss factor (PLF) in the UAV jamming link due to attitude change, which may be caused by the wind or intended movement. The attitude change is modeled by a combination of three successive rotations using roll, pitch, and yaw, which are defined as UAV rotations. The proposed method is applied to a jamming link, where a small UAV with an omnidirectional antenna is jammed by a jammer antenna on the ground. The method is applied to a plane ground and over a simulated terrain. The variation of the PLF according to the change of UAV attitude may be higher than the generally expected PLF at locations where the height difference between the UAV and the jammer is large, and near the locations where the jammer is located close to the vertical plane containing the rotation axis when the attitude change is represented by one rotation.

scholarly journals Identification of a simplified mathematical model of an unmanned aerial vehicle

2020 ◽  
pp. 26-33
Author(s):  
A. A. Lobaty ◽  
Y. F. Yatsyna ◽  
S. S. Prohorovith ◽  
Y. A. Hvitko
Keyword(s):  
Mathematical Model ◽  
Transfer Function ◽  
Unmanned Aerial Vehicle ◽  
Center Of Mass ◽  
Experimental Studies ◽  
Vertical Plane ◽  
Parametric Identification ◽  
Ease Of Use ◽  
Aerial Vehicle ◽  
Discrete Values

The problem of determining the shape and parameters of a mathematical model in the form of a transfer function for the movement of an unmanned aerial vehicle (UAV) in the vertical plane of space is solved. The angle of deviation of the Elevator is considered as the input signal, and the pitch angle of the UAV is considered as the output signal. We use the results of experimental studies of UAV flight, which are considered as known values of input and output signals under specified flight conditions. The measured discrete values of the experimental results are approximated by a fourth-order polynomial based on regression analysis for ease of use in identification. The analytical substantiation of the need to apply the methods of linearization of the mathematical model of UAV movement and the accepted assumptions for obtaining differential equations of UAV movement relative to the center of mass, allowing to synthesize the required transfer function of the corresponding element of the UAV control system. The results of computer modeling confirmed the validity of the synthesized mathematical model obtained on the basis of structural and parametric identification. This approach can be used to obtain simplified mathematical models that are used to solve problems of synthesis and optimization of control systems not only for UAVS, but also for other dynamic objects.

The Research of Geometric Rectification of Aerial Image for Miniature Unmanned Aerial Vehicle

2013 ◽  
Vol 392 ◽  
pp. 257-260
Author(s):  
Xiao Gang Liu ◽  
Jin Li Li
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Attitude Change ◽  
Aerial Imagery ◽  
Geometric Distortion ◽  
Aerial Image ◽  
Target Area ◽  
Geometric Correction ◽  
Correction Model ◽  
Distortion Analysis ◽  
Aerial Vehicle

The unmanned aerial vehicle (UAV) aerial technology increasingly been widely used and attention, this paper first describes the cause of geometric distortion of aerial image, and then using Denavit-Hartenberg (D-H) theory on the flight attitude change of the UAV has led to the phenomenon of image distortion analysis, and the establishment of corresponding image geometric correction model. The terrain is relatively flat areas near a school in Guilin as an aerial target area, geometric correction processing the acquired aerial imagery, experimental results show the effectiveness of the method.

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.

Large attitude change flight of a quad tilt rotor unmanned aerial vehicle

2016 ◽  
Vol 30 (5) ◽  
pp. 326-337 ◽  
Author(s):  
Atsushi Oosedo ◽  
Satoko Abiko ◽  
Shota Narasaki ◽  
Atsushi Kuno ◽  
Atsushi Konno ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Attitude Change ◽  
Tilt Rotor ◽  
Aerial Vehicle
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