Abstract
With the continuous operation of reference stations for various purposes, the system has been built one after another. The network RTK (carrier real-time dynamic positioning technology) composed of multi-base stations has emerged, which solves the limitation of conventional RTK. Although some of these systematic errors can be weakened by the model, their residual can not be ignored. Conventional RTK has some problems in practical application. Differential technology can only eliminate common errors between reference stations and user stations under certain conditions. The emergence of VRS (Virtual Reference Station) technology in network RTK has greatly improved the effective distance of RTK technology. The VRS is characterized by continuous operation of multiple reference station networks and long-distance high-precision real-time positioning. While ensuring that the distance between the base stations cannot be too long and the user’s positioning accuracy is at the same time. Also consider the range of user operations that the system can cover.
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