Aerospace & Defense Technology - May 2021 - 30

Tech Briefs

station on wireless performance within
mesh network. Decentralized mesh
networking topology indirectl y supports UAV communication through an
intermediate UAV. Altitude creates unstable network performance because of
UAV speed and movement in free
space that affect the antenna orientation, which in turn affects perform-

ance in this network. In order to reinforce the strength of ground forces,
and support front line missions, it is
necessary to maintain the connectivity of UAVs and the continuous transmission of information between UAVs
and the ground station; it is therefore
critical to understand what UAV altitude enhances network performance

and minimizes mobile ad hoc network
(MANET) latency.
This work was done by Abdulkarim Rashed
T. Aljaber for the Naval Postgraduate School.
For more information, download the
Technical Support Package (free white
paper) at www.aerodefensetech.com/tsp
under the Unmanned Vehicles & Robotics
category. NPS-001

Investigation of Flight Dynamics and Controls for a SolarTracker-Mounted UAV
Optimizing solar panel orientation with regards to the sun while minimizing power consumed by the
tracking device could result in more efficient UAV power systems.
Air Force Research Laboratory, Unit 45002, APO AP 96338-5002

U

nmanned Aerial Vehicles (UAVs)
have been widely used to carry cameras, sensors or products for applications
such as mapping, frame monitoring,
goods delivery, entertainment and more.
The most common UAVs are powered by
battery only, which limits the duration
of operation. However, current batteries
of the system depending on vehicle, payload, and wind conditions enable only
flights up to 30 min for quadrotors,
which can limit the usage of these UAVs
for long time missions and experiments.

Battery powered electric UAVs suffer
from uncertainties in estimating the remaining charge and hence, most flight
plans are highly conservative in nature.
Batteries also decrease in capacity with
time and usage during operating. The
output current plays a big role in determining the losses inside a battery and is
an important parameter to consider
when analyzing battery performance.
For a long-time mission like large farm
observation or border monitoring, a
UAV must return to its recharging sta-

Solar Panel

(7)

(6))

(4))

(5)

(2)
(3)

(1)

Parallel Mechanism

30

www.aerodefensetech.com

Cov

ToC

tion, which limits its operation range. A
technology of energy supply which
makes a UAV operate longer and be able
to recharge anywhere during its mission
would be an advantage for continuous
operation.
Solar energy systems have emerged as
a viable source of renewable energy over
the past two or three decades and are
now widely used in a variety of industrial and domestic applications. Such
systems are designed to collect the energy from the sunlight and convert it
into electrical power. Solar trackers are
defined as devices which have the role
of improving efficiency by keeping the
solar panel perpendicular to the sun
rays. The first automated solar tracking
system was proposed by Mcfee.
There are two types of solar tracker:
single-axis trackers and dual-axis
tacker. Solar trackers with one axis
have much better performance than
fixed systems, but two-axis systems
allow optimal tracking of the sun's
path, since they keep the orientation
of the collectors perpendicular to the
solar radiation at any time in any season. The main challenge of these kinds
of devices is that they have to consume
a certain amount of energy in order to
move the collectors following the sun
trajectory.
Dual axis solar trackers have been of interest for many researchers, and a number of techniques have been developed to
obtain better efficiency with the desired
Aerospace & Defense Technology, May 2021


http://www.aerodefensetech.com/tsp http://www.aerodefensetech.com http://www.abpi.net/ntbpdfclicks/l.php?202105ADTNAV

Aerospace & Defense Technology - May 2021

Table of Contents for the Digital Edition of Aerospace & Defense Technology - May 2021

Aerospace & Defense Technology - May 2021 - Intro
Aerospace & Defense Technology - May 2021 - Sponsor
Aerospace & Defense Technology - May 2021 - Cov1
Aerospace & Defense Technology - May 2021 - Cov2
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Aerospace & Defense Technology - May 2021 - Cov3
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