使用卫星链路提供车载Wi-Fi

　　使用卫星链路提供车载Wi-Fi

　　卫星链接现在可以让飞机上的Wi-Fi实时、随时浏览，但这项技术仍处于初级阶段。在飞行的Wi-Fi现在可以访问约40%的美国航班和国际长途航班通过公司，如汉莎航空公司，Emirates和卡塔尔航空公司。挪威和土耳其航空公司免费提供这项服务，而斯堪的纳维亚航空公司正在对一些飞机进行测试。然而，带宽是明显有限的时刻。

　　有几个不同的拓扑结构和架构，可以用来提供数据的飞机座椅，但重点是减少重量和功率，以尽量减少燃料成本增加这个功能。一些运营商，如在美国使用3G地面发射机连接到飞机的戈戈，它可以让设备如手机和宽带的网卡的接收信号直接加在飞机一个接收器，但有限的带宽约为3 Mbit / s的整个飞机没有国际使用。Gogo目前推出了其atg-4技术，采用双调制解调器和定向天线来提高链接到9.8兆位/秒的最大理论，但它仍然是局限于大陆美国。

　　Others have been implementing links through geostationary satellites with the Ka-band （12-18 GHz） receivers， but this similarly has low bandwidth and requires a satellite receiver on-board coupled with a Wi-Fi transceiver that can handle multiple channels. Lufthansa‘s FlyNet system claims download speeds to the aircraft of up to 50 Mbit/s， but this can mean as little as 1 Mbit/s to the seat. Similarly， Panasonic Avionics and GoGo have teamed up with European satellite operator SES to boost in-flight connectivity for passengers on trans-Atlantic flights using Ku-band links from the newly launched SES-6 satellite.

　　The development of this equipment needs to focus on weight and power consumption to be acceptable to airline operators. The new systems also have to meet safety approvals in all the countries where the airline operates and demonstrate that the use of the equipment does not affect the avionics systems.

　　The next generation of Ka-band （26.5-40 GHz） satellite transponders is now being used to provide high-speed broadband links to aircraft. Satellite operator ViaSat says it can guarantee 12 Mbit/s to the seat using this technology， and the cost of providing the bandwidth over satellite links could fall by as much as a factor of five as it rolls out in volume.