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WiFi stands for Wireless Fidelity
Internet has became a part in one of the daily needs .Every individual has edicted to the usage of internet.In airplane,we’ve had to turn off our electronic devices, and rely instead on movies and in-flight magazines for entertainment.Connectivity is much more important .Passengers don’t just want to admire the view, or complain about a meal to their neighbor – they expect to be able to tweet about it, immediately, complete with pictures.
The in-flight Wifi services started in 2008 . In-flight Wifi is now accessible on around 40% of US flights and on international long haul flights via companies such as Lufthansa, Emirates and Qatar Airways.
How plane Wifi works ?
There are two primary methods to enable a passenger with Internet connection on an airplane: Air-to-Ground and Satellite.
ATG ( Air to Ground ) :
Air to ground mean that the people in the ground communicate with the people in the airborne vehicles .ATG are similar to cell phone towers where ground based towers sends signals to the aircraft antenna.The aircraft moves to different places ,the antenna at the bottom of aircraft receives signals from nearest towers.As the towers being changed from place to place there will be some difficulty in browsing. Planes are outfitted with the newest radio and GPS systems as well as internet and video capabilities.
Gogo Inc.is a provider of in-flight broadband Internet service and other connectivity services for commercial and business aircraft, headquartered in Chicago .Gogo has rolled out the new generation ATG-4 technology, whose bandwidth is up to 9.8 megabits per second (Mbps) per airplane
A communication satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder which creates a communication channel between a source transmitter and a receiver at different locations on Earth.A satellite data unit (SDU) is an avionics device installed in an aircraft that allows air/ground communication via a satellite network.The nearest satellite in orbit supplies the connection to the plane as the plane moves along its defined route.
The satellite networks transmit data at different bandwidths where we have two common bandwidths in in-flight connectivity are L-band and Ku-band .L-band sometimes referred to as narrowband has an operating frequency range of 1–2 GHz in the radio spectrum and has only 30 MHz allocated for use.The Ku-Band antenna is housed in a big dome-shaped “saucer” that sits on top of the plane, and similar to a rooftop TV dish on a house, this antenna has to be directed toward the transmitting satellite as the plane flies. Ku-band networks utilize 500 MHz of frequency bandwidth between 11-14.5 GHz.