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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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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This paper has the directive significance for improving GPS positioning precision and expanding the GPS application fields in precise engineering surveying.

通过文章介绍，在精密工程测量中必将对GPS定位精度提升及扩展GPS的应用领域有一定的指导作用。

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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.

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