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===Satellite Link===
===Satellite Link===
A satellite data unit (SDU) manufactured by [[Thales Group|Thales]] and branded ''TopConnect'' establishes a [[Backhaul (telecommunications)|backhaul link]] to the ground through Inmarsat's [[SwiftBroadband]] [[Geostationary orbit|geostationary]] [[satellite constellation]] operating in the [[L band]] around 1500 MHz which allows the use of electronically steerable antennas mounted atop the aircraft fuselage and encased within a fiberglass, RF-transparent radome
A satellite data unit (SDU) manufactured by [[Thales Group|Thales]] and branded ''TopConnect'' establishes a [[Backhaul (telecommunications)|backhaul link]] to the ground through Inmarsat's [[SwiftBroadband]] [[Geostationary orbit|geostationary]] [[satellite constellation]] operating in the [[L band]] around 1500 MHz which allows the use of electronically steerable antennas mounted atop the aircraft fuselage and encased within a fiberglass, RF-transparent radome
that have a low profile compared to systems operating in the [[Ku band|K<sub>u</sub> band]] or [[Ka band|K<sub>a</sub> band]] which today still require mechanically steerable antennas with a significantly higher profile. Thus drag and fuel costs are reduced llowing economical operation even on smaller aircraft like business or regional jets.
that have a low profile compared to systems operating in the [[Ku band|K<sub>u</sub> band]] or [[Ka band|K<sub>a</sub> band]] which today still require mechanically steerable antennas with a significantly higher profile. Thus drag and fuel costs are reduced allowing economical operation even on smaller aircraft like business or regional jets.
Inmarsat's SwiftBroadband system covers much of the planet except for the polar regions above −82 and below +82 degrees latitude and currently provides symmetric data rates of up to 432 kbit/s per channel dependent on signal quality and overall load on the satellite's spotbeam serving the corresponding geographical area. Currently the Thales SDU can bond two channels resulting in a maximum bandwidth of 864 kbit/s.
Inmarsat's SwiftBroadband system covers much of the planet except for the polar regions above −82 and below +82 degrees latitude and currently provides symmetric data rates of up to 432 kbit/s per channel dependent on signal quality and overall load on the satellite's spotbeam serving the corresponding geographical area. Currently the Thales SDU can bond two channels resulting in a maximum bandwidth of 864 kbit/s.


Revision as of 07:26, 21 January 2013

OnAir
Company typePrivate
IndustryTelecommunication, Technology, Aviation
Founded2005
HeadquartersGeneva, Switzerland
Websitewww.onair.aero

Incorporated in February 2005, OnAir is a joint venture with SITA and Airbus. OnAir is headquartered in Geneva, Switzerland, and has operations in Seattle and Montreal and sales offices in London, Kuala Lumpur and Dubai.

OnAir enables airline and cruise ship passengers to use their mobile phones and laptops for calls, text messaging, emails and Internet browsing.

By April 2012, OnAir’s services were available on over 26 customers, including 16 airlines flying over five continents.

Services

OnAir offers three services which aircraft operators can order together or separately:

  • Internet OnAir is a Wi-Fi network which offers Internet access at broadband speed to passengers
  • Mobile OnAir is a cellphone service which offers mobile telephony, SMS and narrowband Internet access (56 kbit/s) and so allows passengers to make and receive calls on their mobile phones, send and receive text messages and emails and use the Internet. Airlines can restrict usage of these services at discretion enabling them to ban voice calls and allow only SMS and Internet access instead. Lufthansa is one airline following this restrictive approach due to passengers' alleged desire for quiet during flights.[1]
  • Link OnAir' is a managed network service that allows airlines to use the IP-based satellite connection used by the aforementioned services for other applications, such as supplying in-flight entertainment systems with news content or Internet access and providing mission-critical information and communication services to air crews.

All three services share the same satellite connection to the ground.

OnAir was the first company to provide integrated GSM and inflight wifi services, with Oman Air as the launch airline in March 2010.

OnAir’s technology has been certified for use on many types of aircraft – both private and commercial jets including Boeing and Airbus – for short and long haul. In most cases, it is available for linefit or retrofit.

Technology

typical location of satellite antenna radome

OnAir's onboard system is based on a Wi-Fi access point and/or a GSM picocell connected to the ground through a satellite link. All onboard equipment, except for the satellite antenna, fits into a hand-luggage compartment.

A satellite data unit (SDU) manufactured by Thales and branded TopConnect establishes a backhaul link to the ground through Inmarsat's SwiftBroadband geostationary satellite constellation operating in the L band around 1500 MHz which allows the use of electronically steerable antennas mounted atop the aircraft fuselage and encased within a fiberglass, RF-transparent radome that have a low profile compared to systems operating in the Ku band or Ka band which today still require mechanically steerable antennas with a significantly higher profile. Thus drag and fuel costs are reduced allowing economical operation even on smaller aircraft like business or regional jets. Inmarsat's SwiftBroadband system covers much of the planet except for the polar regions above −82 and below +82 degrees latitude and currently provides symmetric data rates of up to 432 kbit/s per channel dependent on signal quality and overall load on the satellite's spotbeam serving the corresponding geographical area. Currently the Thales SDU can bond two channels resulting in a maximum bandwidth of 864 kbit/s.

90% of the onboard equipment can be used with any radio link, for example other satellite networks or a direct air-to-ground link. There is also a clear upgrade path from SwiftBroadband to Inmarsat's Global Xpress system, a constellation of three Ka band satellites which will come on stream in 2014-2015 and will globally provide downlink bandwidths of up to 50 Mbit/s. OnAir was appointed as distribution partner for Inmarsat's Global Xpress service in November 2011.[2]

Onboard Server

A server installed onboard manages the satellite connection and routes the data traffic while also compressing and decompressing all data transmitted, including GSM phone calls that are recoded using the AMR codec which reduces bandwidth while maintaining a voice quality virtually indistinguishable from the native GSM codec.

Wi-Fi Network

Broadband Internet access (Internet OnAir) is provided by Wi-Fi access points. In order to access OnAir's Wi-Fi Internet service (Internet OnAir) passengers need to bring a Wi-Fi compatible device. Access can usually be purchased on board.

GSM Network

A picocell operating according to the GSM-1800 standard provides a GSM network (Mobile OnAir) enabling voice telephony, SMS and narrowband Internet access (GPRS). The GSM signal is distributed by a leaky line antenna, essentially a coaxial cable with a slotted shielding through which RF signals are radiated. This coaxial cable is installed above the ceiling panels along the whole aircraft cabin and provides a uniform linear coverage of the aircraft cabin at very low radiation power levels. In order to prevent handsets from connecting to terrestrial networks which would lead to high transmission power levels a so-called network control unit (NCU) installed onboard generates a broadband noise floor which is being emitted through the existing leaky line antenna masking reception of terrestrial mobile networks within the aircraft. These measures ensure that handsets can only connect to the onboard GSM network and will then operate with the lowest possible transmission power level (GSM-1800 power control level 15, nominal output power of 0 dBm) which results in significantly lower radiation levels than those experienced on average when using a mobile phone with terrestrial networks on the ground. The GSM network is being realized based on Monaco Telecom's core network. It uses the MCC / MNC tuple 901-15 assigned to SITA, one of OnAir's two owners, in March 2005.[3]

Passenger Equipment Compatibility

OnAir's inflight cellphone service (Mobile OnAir) requires a mobile phone supporting the GSM-1800 standard, also called DCS (Digital Cellular Service), which most modern GSM phones support as well as a SIM card from a network operator having a roaming agreement with Monaco Telcom. So-called quad-band handsets always support GSM-1800 and so are compatible with Mobile OnAir.

IFE Connectivity

The system can also provide IP-based connectivity to existing in-flight entertainment systems which allows news content to be fed in and messaging services as well as Internet access to be offered on in-seat units.

Customers

OnAir's customers which have been publicly announced are:

Airlines:

Cruise ship operators:

Private jet operators and VIP:

See also

References

  1. ^ Focus (22 September 2011). "Lufthansa: Ja zur SMS im Flieger, nein zu Telefonaten". Focus. Retrieved 14 July 2012.
  2. ^ OnAir (29 November 2011). "OnAir selected by Inmarsat as Global Xpress Distribution Partner" (PDF). OnAir. Retrieved 14 July 2012.
  3. ^ http://www.itu.int/dms_pub/itu-t/opb/sp/T-SP-OB.832-2005-PDF-E.pdf
  4. ^ [1]
  5. ^ "FARNBOROUGH: Emirates to fit 90 A380s with OnAir connectivity". Retrieved 2010-07-21.

Bibliography

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