VRS Algorithm Research And Analysis Of Positioning Accuracy

With the application of GPS technology becomes more extensive,a variety of uses Continuous operation Reference Station (CORS) have been completed. To a permanent monitoring network (stations) systems, as well as various types of wide area differential GPS system, as represented by the reference station has been gradually on the broad coverage of the continent into a regional or even global network.Along with the rapid development of the Internet, regional and worldwide exchange of information and data has become Very easy, This emerged from many of the GPS base stations constitutes a network service system GPS technology has become the latest trend. because of wide coverage, high positioning accuracy, high reliability, The Virtual Reference Station (VRS) technology become one of the most popular network RTK technology, It is mainly use the station original observation data base on network,Then it would simulate a group of reference station data(including the reference station GPS coordinates and carrier phase observations) in real-time at the vicinity of mobile station. Implementation of the"reconstruction and simulation of the reference station data", and providing high-precision navigation and positioning information in real-time.This article is to study such Virtual Reference Station (VRS) technology. First of all, It Carried out the needs for VRS Technology from the development of GPS positioning technology,the Categories of the network RTK technology as well as the classification of the studying status at home and abroad. Second the paper describes the component of VRS system and its working principle, on this basis,an analysis of VRS positioning system of mathematical models and some of the key technologies were given out. Then the impact of VRS positioning of the main systematic errors (such as satellite ephemeris errors, clock errors, ionospheric and tropospheric delay effects, as well as multi-path error) were set out separately. Fouth,the paper deducted the interpolation methods and getting correction methods of VRS technology.Finally tested the positioning accuracy of VRS from a specific experiment,The positioning accuracy of test point were distribution, there's no large error and it has high reliability in common.