The Flight Characteristics of The Flight Characteristics of Unmanned Aircraft Systems Unmanned Aircraft Systems Presentation created by Leonid Sopizhenko student of SE 107 group
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1. The Flight Characteristics ofThe Flight Characteristics of
Unmanned Aircraft SystemsUnmanned Aircraft Systems Presentation
created by Leonid Sopizhenko student of SE 107 group
2. Introduction Development of unmanned air vehicles has been
greatly accelerated in the past decade. Major aerospace
organizations have seen the flexibility of application of such
vehicles in a military or battle field situations. This will
inevitably do away with the high casualties associated with
conflict scenarios. There are three groups of UAV: 1. High altitude
and long endurance (HALE). 2. Medium altitude and long endurance
(MALE). 3. Tactical role referred to as TUAV.
3. UAVs TypesUAVs Types Target and decoyTarget and decoy -
providing ground and aerial gunnery a- providing ground and aerial
gunnery a target that simulates an enemy aircraft or missiletarget
that simulates an enemy aircraft or missile
ReconnaissanceReconnaissance - providing battlefield intelligence-
providing battlefield intelligence CombatCombat - providing attack
capability for high-risk missions- providing attack capability for
high-risk missions Research and developmentResearch and development
- used to further develop- used to further develop UAV technologies
to be integrated into field deployed UAVUAV technologies to be
integrated into field deployed UAV aircraftaircraft Civil and
Commercial UAVsCivil and Commercial UAVs - UAVs specifically
designed- UAVs specifically designed for civil and commercial
applicationsfor civil and commercial applications
4. Flight characteristics of UAVs Flight characteristics of
UAVs typically divided by several groups: 1)Flight control
2)Navigation 3)Propulsion 4)Payloads 5)Launch and recovery
6)Communication 7)Air traffic management
5. Flight control Typically a UAV is operated by: 1- A flight
control (designated pilot). 2- A payload control (sensor operator).
3- A command control (mission controller). 4- A maintenance control
(ground crew).
6. Navigation Unmanned air vehicles usually incorporate global
positioning satellite (GPS) systems for navigation. These systems
use pre-programmed way points which can be modified by the mission
controller allowing for quick and effective mission changes. Such a
system however suffers from the need for 3-d digital maps of the
global terrain which itself can be a technological barrier.
7. Scheme of transfer information by drone to the
receiver.
8. Propulsion Piston or electric engines are commonly observed
on UAVs. Turboprop and turbojet engines are more suited to HALE and
MALE types of UAV. There are new innovations in the area of UAV
propulsion especially focused on improving UAV endurance. Such
innovations for example, regenerative fuel cells, solar and nuclear
power are envisaged to give long operational life for the
UAVs.
9. Scheme of turbojet engine The fuel-air mixture is injected
into the combustion chamber, where it is a constant burning. Formed
during combustion gas under very high pressure is released through
the nozzle outwards, creating the reactive power and causing the
rocket motor, and with it the rocket to move in the opposite
direction.
10. Payloads Most aircraft payloads can also be carried by
UAVs. The restrictions here more to a scaling problem the size of
the payload and the corresponding availability of a UAV to
transport it. For TUAVs miniaturization of payloads has already
been researched where payloads have been appropriately scaled down.
Micro-UAVs are currently being research for military use.
11. Launch and recovery A runway or flat open site is used for
both the launch and recovery of HALE and MALE types of UAV. In such
cases no pre-flight assembly of the UAV is required. For TUAVs a
RATO (rocket assisted) system or a catapult system (from a rail) is
used for take-off. The recovery of such UAVs is performed using an
airbag or parachute. Other methods of launching UAVs include air
launching from under an aircraft wing, helicopter launching or even
VTOL (vertical take-off and landing).
12. For large UAVs we must use special catapult.Also for little
UAVs we can use catapult or launch it with help of special
slingshot or manually
13. Communication Modern day UAVs use dedicated control link
interfaces between vehicle and operator controller. This may
include satellite UHF (or Ku) bands for both long range and short
range.A failure mode has to be built into the UAV to allow for
control link failure and enabling it to operate autonomous if
required. The Ku band is the 1218 GHz portion of the
electromagnetic spectrum in the microwave range of frequencies. The
C band is the 4-8 GHz portion of the electromagnetic spectrum in
the microwave range of frequencies.
14. Communication between UAV and ground receiver
15. Air Traffic Management The issue of air traffic management
for UAVs lags well behind the actual developments and capabilities
of the UAVs. As such there are no rules which have been exclusively
specified for UAV air traffic management. The UAVs themselves have
been built to a high quality standard
16. Conclusions The future of UAVs definitely looks bright and
eventful. Given the current conflicts worldwide, UAVs have a
definite part to play from a military perspective. The rest of the
world however contributes very little to UAV research and
development. It is expected that the military will hence drive the
UAV requirements for 20-30 years before a shift to the civilian
sector.