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satelites

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by

Amel Krouma

on 17 August 2016

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Transcript of satelites

A Earth Station sends message in GHz range. (Uplink)

Satellite Receive and retransmit signals back. (Downlink)

Other Earth Stations receive message in useful strength area. (Footprint)
photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Satellites
Satellites Overview
1-
History
2-
How Satellites Work
3-
Low-Earth-Orbit (LEOs)
4-
Global Positioning System (GPS)
5-
How do satellites get into space?
6-
How do we repair satellites in space?
1-History
The first artificial satellite Sputnik I was launched by the USSR in October 4, 1957

It was January 1958, before a Jupiter rocket successfully launched Explorer 1, the first American satellite. 

In July 1963 the Hughes Aircraft Corporation launched the experimental Syncom 2 for NASA, the world's first geosynchronous communications satellite
.
Questions ???
2-How satellites work ?


Advantages:
Reduces transmission delay
Eliminates need for bulky receiving equipment.
Disadvantages:
Smaller coverage area.
Shorter life span (5-8 yrs.) than GEOs (10 yrs).
4-GPS: What is it ?
3-Low-Earth-Orbit (LEO)
5-How do satellites get into space?
GPS: How it works
Satellites are reference points for locations on Earth.
==> Use satellites in space as reference points for locations on earth.

GPS satellites use a "triangulate" system.

Triangulation ==> measure distance and find out position from three satellites position .
GPS: Who Uses GPS ?
GPS has a variety of applications:
Land: diverse uses; ex. surveying, recreational. Etc

Sea: navigation by recreational boaters, commercial fishermen, and professional mariners

Air: navigation by general aviation and commercial aircraft
A constellation of 24 satellites

They are constantly moving, making two complete orbits in less than 24 hours.
Altitude (375-1000 miles)
Revolution time: 90 min - 3 hours.
speed stability: 7.8 km/s
Little LEOs Applications
Vehicle tracking.
Environmental monitoring and two-way data communication.
Used for technology devices such as high-speed, high-bandwidth data communications, and video conferencing.
Classification: LEO
Orbit: 375 miles, 600 km.
Revolution time: 100 min.
Speed: 17,000 miles/hr
Hubble Telescope
Evidence that planets orbit stars other than the Sun was obtained for the first time with Hubble.
Delta II Launch Vehicle
STS-31 lifts off, carrying Hubble into orbit.
A satellite is sent into space on top of a rocket. When a satellite is put into space, we say that it is “launched.”
Ariane launch Vehicle
6-How do we repair satellites in space
Satellites are expensive, are not safe from failure and have a life limited by the capabilities of their fuel tank.
Sources
http://www.telesatellite.net/sur-les-transpondeurs/la-nasa-veut-pouvoir-ravitailler-et-reparer-les-satellites-dans-lespace/
searchNetworking.com Definitions - Satellite
http://fr.wikipedia.org/wiki/T%C3%A9lescope_spatial_Hubble
The satellite(as Hubble) is visited by astronauts operating from space shuttles to correct malfunctions and install new equipment.
Can we correct satellites by robots?
Conclusion
Araouki
Farah
Full transcript