use of stratellite for wireless communication, haaps technology, high altitude communication, payload models

1. STRATELLITE
SATELLITE IN STRATOSPHERE

2. CONTENTS
• Introduction to stratellite
• Construction and working
• Stratellite vs satellite
• Applications
• Advantages
• Disadvantages
• Conclusion
• References

3. INTRODUCTION TO STRATELLITE
• Stratellite is a “High Altitude Airship(HAA)”, is similar
to a satellite, but is stationed in the stratosphere
rather than in orbit.
• It is positioned approximately 13 miles above the
earth, that provides the benefits of a satellite like
remote sensing, navigation and communication.
• At an higher altitude, each Stratellite will have clear
line-of-site communications capability to an entire
major-metropolitan area as well as being able to
provide coverage across major rural areas.
• A single unit could send broadband, mobile phone
and digital television and radio signals to a large area.

4. CONSTRUCTION AND WORKING
OF STRATELLITE
• Stratellite is provided with a new steering
method which uses a hybrid electric system that
drives large, slow-turning propellers. This gives
the airship helicopter-like agility by being able
to move both up and down, and side to side.
• The outside layer, or "envelope," is made out of
a high-tech material called Spectra - Spectra
contains fiber i.e., 10 times as strong as steel of
the same weight.
• The inside layer, made from a thin but strong
polyester film called Mylar, is fitted inside the
envelope and filled with a mixture of helium
and air as helium is an inert gas and is therefore
not flammable.

5. WORKING (Cont.)
• The Helium gas expands pushing out air and lifting
the airship.
• Uses solar cells sprayed on their surface to generate
electricity.
• The generated electricity drives propellers that work
with GPS technology to keep the stratellite
stationary with respect to earth’s surface.
• Prototype airships are projected to carry payloads as
large as 4,000 pounds, and later models are
expected to carry over 20,000 pounds of radars and
other remote imaging equipment, navigational aids,
and telecommunications relays.

6. FOOTPRINTS
Uniform cellular footprint model Plural zone cellular beam model

7. STRATELLITE
AND RESISTANCE TO WIND GUSTS
The instantaneous power needed to counter the wind force exerted on an
airship is
P = (1/2) ∗ (ρ) ∗ Cd ∗ Sc ∗ v 3
Where ,
• ρ - air density
• Cd - drag coefficient
• Sc - is the airship cross sectional area
• v - instantaneous wind velocity.

8. PLATFORM ONBOARD AND
GROUND PAYLOAD
Block diagram of onboard equipment Block diagram of on the ground
equipment.

9. STRATELLITE VS
SATELLITE

11. APPLICATIONS
• In addition to voice and data, proposed
telecommunications uses include cellular, 4G/5G
mobile, MMDS, paging, fixed wireless telephony,
HDTV, real-time surveillance and OTHERS.
• Service an large area of 300,000 square-miles , which
can be used instead of thousand of towers.
• Stratellites can carry over 20,000 pounds of radars and
other remote imaging equipment, navigational aids,
and telecommunications relays.
• Stratellites are planned to remain on station for a year
at a time and will cost a one fifth as much as a
comparable satellite. Clean solar energy collection
systems with advanced wireless communication.

12. ADVANTAGES
• Two-way high speed data communication. High speed broad-band access
even in remote area.
• Decreases Signal latency
• For a country two stratellites are enough instead of thousands of towers.
• In environmental disasters telecommunication breaks down within
seconds, Re-installation of the infrastructure takes weeks or months. The
Stratellite can be used as a floating mobile telecommunication station for
all telecommunication purposes and the transmission of temporary data
communication, telecommunication and TV-programs as well as long-term
missions over metropolitan cities.

13. DISADVANTAGES
• May lead to traffic problems in stratosphere.
• Would require efficient ground control and maintenance.
• So far, this technology remains non-commercialized, and is in a prototype
stage for further developments.
• Unlike with a satellite, a stratellite is at the mercy of the weather.

14. CONCLUSION AND FUTURE SCOPE
• They minimize the cost of communication. Stratellites
present a mobile, low-cost, high-capacity alternative to
satellite relays and cell towers.
• Once the defects of Stratellites have been overcome and
become more reliable, they play a vital role in the future
generation wireless communication.
• This is a promising technology that could combine the best
of Satellite and wired Internet - fast with low latency and
hugely widespread.

15. REFERENCE
• http://en.wikipedia.org/wiki/Stratellite
• http://en.wikipedia.org/wiki/Geostationary_orbit
• http://www.techdirt.com/articles/20021223/1452217.shtml
• https://www.tahoedailytribune.com/news/company-tests-
robotic-dirigible-for-wireless-communications/
• https://www.infolotnicze.pl/2012/06/04/stratellite-uav/

16. THANK YOU