For the formation control of Autonomous Underwater Vehicles(AUV),the advantage and shortcoming of several different formation control method is analyzed,and a new formation control method that possesses both the advantage of Leader-Follower formation control and Virtual Structure formation control based on virtual reference point(VRP) is proposed for AUV in this paper.

To construct virtual reference consultation system has become one of the important tasks of libraries.

This paper introduces the communication protocols in VRS technology and analyzes the use of each protocol.

VRS(Virtual Reference Station) represents GPS-RTK Technology,whose appearance would unitize all the surveying and mapping work in an area.

A new network RTK technology,called augmentation reference station(ARS),which characterizes multiple-baseline difference-positioning technology with the real-time observations of the multiple stations,is proposed under analyzing the shortcomings of VRS and MAC.

Construction and Research of Virtual Reference Station;

The Virtual Reference Station(VRS) s components,principle of operation and its advantages were discussed.

In order to realize precision positioning based on network difference, an method for calculating difference correction message of NRTK was proposed by virtual reference station technique.

The virtual reference station (VRS) is an efficient method for the network users to perform RTK positioning.

Virtual Reference Station (VRS) technique, which integrates computer-network management technology, internet technolog.

In some hyperboles, statements that concern a counterfactual reference point of the pragmatic scale implicate propositions about the target point.