A new micro-positioning control system using PZT for ultra-precision grinding was designed. The functions of this system include measure, compensate, drive, etc.

介绍了一种最新开发的面向精密磨床的压电陶瓷驱动微进给控制系统，该系统是一个驱动、检测和补偿为一体的闭环系统。

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NextGen is the FAA's long-term plan to replace the current radar-based air-traffic-control system 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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Under the OSSS contract, Harris provided operations, maintenance and support services to the Air Force Satellite Control network and Global Positioning System ground networks.

根据这份OSSS合同，哈里斯公司为美国空军卫星控制网络和GPS地面网络提供了运行、维护和支持服务。

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The report calls for accelerating the use of the global positioning satellite system (GPS) in U.S. airspace and ultimately linking GPS and the air traffic control system to provide better and safer separation for planes flying in the United States.

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Among its most recent products include a watch than can receive global positioning system location information, one that doubles as a TV remote control, and one that plays MP3 digital music files.

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