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'