Satellites
Last updated
Last updated
Elliptical or circular orbits.
Complete rotation time depends on distance satellite-earth.
Inclination: angle between orbit and equator.
Elevation: angle between satellite and horizon.
LOS (Line Of Sight) to the satellite is necessary for connection.
high elevation needed, less absorption due to obstacles.
Uplink: connection base station - satellite.
Downlink: connection satellite - base station.
Typically separated frequencies for uplink and downlink
transponder used for sending/receiving and shifting of frequencies.
transparent transponder: only shift of frequencies.
regenerative transponder: additionally signal regeneration.