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Satellite Tech (Orbits (GEO (Geostationary Orbit, Geosynchronous, over…
Satellite Tech
Orbits
LEO
Lower Earth Orbit, dist of 200 - 2k kms from earth surface
Majority of satellites, intl space station in this orbit
Not geosynchronous, network of satellites req for observation, most satellites orbit earth in 90min*
Closer to earth; Applic: spy satellites, remote sensing, communication satellites
Concern of space debris,8.5k objects >10mm in leo,
2mm more than 1 mn objects
SSPO
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Near polar Orbit with earth as centre, will pass through any given point on earth in the same local solar time
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GEO
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Geosynchronous, over equator, stationary to earth
Application dish tv, antenna direction change not practical
One satellite gives 42% coverage, 3 satellites can give for whole globe
Earth's elliptical shape, pull of Sun & Moon cause drift from path, fuel for station keeping, amount of fuel determines satellite life
Due to large dist delay of about half second in communication, eg: anchor to reporter, qn to rch reporter quarter second, answer back quarter sec
HEO
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Two focal points, earth centre & ellipse focal point
Two imp points perigree closest to earth & apogree farthest to earth, perigree faster, apogree earth gravitational field lower hence slower
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