Geostationary satellites are commonly used for communications and weather-observation.
The typical service life expectancy of a geostationary satellite is 10-15 years.
Because geostationary satellites circle the earth at the equator, they are not able to provide coverage at the Northernmost and Southernmost latitudes.
For a satellite to be in a particular orbit, a particular velocity is required or a given height above Earth ‘r0+h’.
Telecommunications satellites remain above one given point on the Earth’s surface, so are called geostationary
broadcast television, forecast the weather.
Spy Satellites move in a polar orbit so that they can perform sweeps of the surface.
spy on enemy forces
Located along the equatorial plane.
About 36000 km above the earth
Has Geo-synchronous orbit
Period of 1436 minutes
Good coverage from remote areas
Has wide field of view ~ 50 degrees
Has low resolution
Provides continuous data ~ 15-30 min.
Not very suitable for vertical soundings
Near polar orbiting
800 to 900 km above the earth
Has Sun-synchronous orbit
Period of 101 minutes
Excellent coverage at the poles
Has relatively narrow field of view
Has high resolution
Passes vary with latitude
Very suitable for vertical soundings
GEO = Geosynchronous
LEO = Polar
These satellites are 36000 km above the surface and have R= 42,000km.
These satellites are positioned to orbit at rate of earths rotation and are always above the same part of the earth.
Used for TV broadcasts and mobile phones
Geostationary Operational Environmental Satellite geo-synchronous orbit 35,800 km above the earth
Polar-orbiting Operational Environmental Satellite sun-synchronous orbit 850 km above the earth
The GOES Spacecraft
GOES I-M DataBook
GOES I-M DataBook