Updated: Sep 18, 2020

๐ฅSATCOM๐ฅ
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โ๏ธโ๏ธ๐A satellite data unit (SDU) is an avionics device installed in an aircraft that allows air/ground communication with a satellite network.
โ๏ธโ๏ธ๐It is an integral part of an aircraft's SATCOM (satellite communications).
โ๏ธโ๏ธ๐The device connects with a satellite with radio frequency (RF) communication and the satellite then connects to a ground station.
โ๏ธโ๏ธ๐It maintains an update of ground stations in the aircraft's current area and the order of preference for selection of which ground station to use which thus guides the choice of satellite.
โ๏ธโ๏ธ๐It is also used to offer Internet services to passengers in flight.
โ๏ธโ๏ธ๐The SATCOM system uses aircraft supplied navigational position data to electronically or mechanically steer the antenna so it can orient itself toward the satellite in use.
โ๏ธโ๏ธ๐As the aircraft moves out of the optimum communication position with one satellite, the SATCOM automatically switches to the next best satellite
