But delays and inefficiencies in air travel are due in large part to an outdated traffic-control system that still relies on slow, ground-based radar stations and repetitive voice communication.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

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Based on the study of radar signal processing technology and algorithm, a new signal processing system for ground PD radar is proposed in this paper.

本文在研究雷达信号处理技术和算法的基础上，设计了一种地面PD雷达信号处理系统方案。

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This paper presents a project of modularization design for ground radar full digital servo system based on CAN bus.

介绍了一种基于CAN总线的地面雷达全数字伺服系统模块化设计方案。

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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

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