But delays and inefficiencies in air travel are due in large part to an outdated traffic-controlsystem that still relies on slow, ground-based radar stations and repetitive voice communication.
NextGen is the FAA's long-term plan to replace the current radar-based air-traffic-controlsystem with one that operates using satellites and a global positioning system.
联邦航空管理局的长期规划是用凭借卫星和全球定位系统的次世代体系替换现有的依靠雷达的空中交管系统。
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In the project of Air TrafficControlSystem Integrated Testing Tool, I have been mainly in charge of designing and developing for the multi-radar testing data simulative software by myself.