To meet the requirement of precise GPS positioning in vehicle management system, and also to consider the development in the future, this paper introduces differential GPS projects.

为了适应现时特种车辆管理系统对车辆GPS定位的精度的需要，并考虑到未来的发展趋势，对差分gps方案进行了介绍。

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Sputnik - the first artificial satellite - is launched by the Soviet Union on October 4, 1957, as a global positioning system for precise weapon delivery and paves the way for GPS as we know it today.

1957年10月4日，苏联发射了首颗人造卫星“斯普特尼克”作为精准武器的全球定位系统，为我们今天所知的GPS铺平了道路。

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GPS receiver can use the fictitious GPS signal to conduct precise positioning.

GPS接收机可以利用这一虚拟的GPS信号进行精密定位。

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For example, researchers in Arizona are using real-time kinematic global positioning systems, an ultra-precise version of GPS that can measure positions with sub-inch accuracy levels, to control weeds in cotton fields with steel cultivators.

FORBES: American Agriculture's 'Sputnik Moment'

Ultimately, the Compass Navigation System could be used worldwide to provide precise positioning data for the Chinese military similar to information already produced by the U.S. GPS for military field commanders.

CENTERFORSECURITYPOLICY: 2007: A Chinese space odyssey