A Seminar On Geostationary Satellite

A seminar on Geostationary Satellite

presented by Arani Ali Khan ECE:6th sem; Batch:X; Roll:1018

WHAT IS GEOSTATIONARY SATELLITE ? 

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Geostationary satellites are positioned at an exact height above the earth (about 36000 Km). At this height they rotate around the earth at the same speed as the earth rotates around its axis, so in effect remaining stationary above a point on the earth (normally directly overhead the equator). As they remain stationary they are ideal for use as communications satellites and also for remote imaging as they can repeatedly scan the same points on the earth beneath them. Polar Orbiting satellites by comparison have a much lower orbit, moving around the earth fairly rapidly, and scanning different areas of the earth at relatively infrequent periods

Motion of Geostationary Satellite around EARTH

Focusing of a particular position on earth

Derivation of radius of orbit

Communication satellite in a stationary orbit

Receiver which point to a geostationary satellite

A stationary satellite and orbit

Position of receivers at different location of earth

Problem of Geostationary Satellite 

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Sun outages affect a geostationary satellite Geostationary satellites are fantastic means of communication except for one little problem called SUN OUTAGES. These sun outages happen during March and September when the sun passes the equator.

How Sunoutages happen?

SUN OUTAGE 

During the spring and fall equinoxes, the sun also passes close to this plane. As seen from the ground, the sun seems to pass behind the satellites once per day. During the time when both the satellite and the sun are in the ground station's field of view, the RF noise energy from the sun can overpower the signal from the satellite. It is this loss or degradation of communications traffic from the satellite that is referred to as sun fade, sun transit or sun outage

Diagram of SUN OUTAGE

Some pictures of earth from geostationary satellite