Radar tracking of the shuttle, like the final accurate ground-based navigation, had not yet begun.

对航天飞机的雷达追踪，如最后精确的陆基导航，还没有开始。

youdao

Its new missile-defence scheme, when deployed, should be bigger and better than the now-cancelled programme of ground-based interceptors in Poland and a radar in the Czech Republic.

新的导弹防御计划一旦部署，将会比已取消的在波兰建立地基拦截导弹和在捷克建雷达要来的更大更好。

youdao

But delays and inefficiencies in air travel are due in large part to an outdated traffic-control system that still relies on slow, ground-based radar stations and repetitive voice communication.

不过航空运输延迟和低效的主要原因还是过时的空中交通管制——一套依靠地面控制、反应迟缓的雷达站和不断重复的语音通讯建立起来的体系。

youdao

He says this is one reason he recommended scrapping plans to build a sophisticated radar system in the Czech Republic and installing ground-based interceptors in Poland.

VOA: standard.2009.09.17

The Bush-era program would have placed ground-based interceptors in Poland and a radar station in the Czech Republic to counter any long-range nuclear threat posed by Iran.

VOA: standard.2009.09.24

Under his plan the large centralized radar facility proposed for the Czech Republic will not be needed, nor will the earlier generation of ground-based interceptors planned for Poland.

VOA: standard.2009.09.17

Every commercial flight that takes off from the United States is currently monitored by a radar-based ground system that has been in place since WWII.

BBC: The futurist: The US�� new air traffic control system

What is ground-based radar telling us about the missiles?

FORBES: Of Day-Trading And Thermonuclear War

He has now also delayed funding for ground-based interceptor and radar sites in Poland and the Czech Republic for defense against Iranian missile launchers.

FORBES: Move up http://i.forbesimg.com t Move down