The Research And Application Of Vrs Technology

Virtual Reference Station (VRS) technique, which integrates computer-network management technology, internet technology, wireless communication technology and GPS technology, combines the most advanced multi-reference stations network RTK algorithms and represents the research direction of the new generation of positioning technology following the Conventional RTK technology. The fundamental principle of VRS is to establish the multi-reference stations on the ground and to utilize each observation information comprehensively, and then to correct the errors which are correlated with distance by the precise error model, to produce a virtual reference station close to the user which does not exist in fact. According to user station and Virtual Reference Station we can form the differences of short base-line or ultra short base-line. So the user can use the differential information received for positioning. Comparing with the conventional RTK, VRS technology has not only improved the precision of positioning and navigation but also expanded the effective coverage of GPS service.On the basis of the introduction to the development of GPS technology, this paper depicts the composition and principle of VRS system in detail, including its composition, principle, workflow, key technology and advantage; Secondly the system's main error sources according to the influence value have been discussed.It specified multi-error resource problem which need be resolved in VRS surveying. The paper deducted interpolation methods, getting corrections methods, and established mathematics model of VRS based on the principle of VRS with the double difference between revivers and satellites, the resolved baseline resolution, basic quality assess. In contrast with Trimble VRS model, the paper telled briefly Trimble VRS model, and compared with them, so pointed out the advantages and disadvantages of the paper VRS model. Fifthly, the paper specified the technology design and reliability of VRS. Lastly, the paper testified the positionprecision, initialization time and reliability of VRS with a foreign test for VRS.