Transcript ch_07 - WordPress.com

Ahlam ah-shebah
433925207
Communication systems
(2)
CT 1401
The satellite
What Is a Satellite?
A satellite is a moon, planet or machine
that orbits a planet or star. For example,
Earth is a satellite because it orbits the
sun
Why satellite
• http://www.onastra.com/2169/why-satellite
Short History of Satellite Communication:
_ 1945 Arthur C. Clarke publishes an essay.
_ “Extra Terrestrial Relays“.
_ 1957 First satellite SPUTNIK.
_ 1960 First reflecting communication satellite
ECHO.
_ 1963 First geostationary satellite SYNCOM.
_ 1965 First commercial geostationary satellite.
Definition satellite
Satellites are specifically made for
telecommunication purpose. They are used
for mobile applications such as
communication to ships, vehicles, planes,
hand-held terminals and for TV and radio
broadcasting.
They are responsible for providing these
services to an assigned region (area) on the
earth. The power and bandwidth of these
satellites depend upon the preferred size of
the footprint, complexity of the traffic control
protocol schemes and the cost of ground
satellite.
The naming of satellite
Arabs were the first to use the word in
astronomy satellite denote the space objects
that follow the other in its orbit, satellite of
the Earth, satellites and collected folk style
and origin of Stella, which came out one after
consecutive one. The style and flocked tears
any means continued. The word Arab satellite
entered the English language through Latin
and French languages ​to become (in English:
Satellite)
The advantages of satellite:
Flexible (if transparent transponders)
Easy to install new circuits
Circuit costs independent of distance
Broadcast possibilities
Temporary applications (restoration)
Niche applications
Mobile applications (especially "fill-in")
The disadvantages of satellite:
Large up front capital costs (space segment
and launch)
Terrestrial break even distance expanding
(now approx. size of Europe)
Interference and propagation
Congestion of frequencies and orbit.
Divide the satellites according to
their applications to:
1 -Communications satellites which are
used in the transmission of-information
Uses satellite communications and is
often the most prevalent
.
2- Satellites broadcast space which are
used in broadcast television channels
and radio wide variety of programming
would be made available to DBS
subscribers over the set-aside capacity,
including distance learning, children’s
educational programming, and medical,
historical, and scientific However.
3- Satellite of Meteorology, The purpose of this
module is to examine Earth observing satellites and
their capabilities in greater detail, focusing on two
satellite orbital groups in particular; Geostationary
Operational Environmental Satellites (GOES) and
Polar Orbiting Environmental Satellites (POES).
Finally, this module will demonstrate how to
interpret visible, infrared and water vapor channel
satellite images
4 -Satellites and military is an artificial
satellite used for a military purpose. The
most common missions are intelligence
gathering, navigation and military
communications. The first military satellites
were photographic reconnaissance
missions.
5 -Scientific satellites Certain satellites are
important for scientific research. These satellites
gather data for scientific analysis. This includes
observations of the atmosphere of our planet, the
stars, the sun and other parts of space. states that
earth orbiting satellites can observe celestial objects
without the interference from the Earth's
atmosphere These satellites are able to record data
without the interference of gases, lights, and
magnetic fields produced on earth.
Additional information
Preparation satellites
Their number is so massive and still
increasing by types and needs her.
A simplified explanation of how it
works
https://www.youtube.com/watch?v=
uEe5GMzcupw
https://www.youtube.com/watch?v=
54MSV2B399o