Research On Network RTK Algorithm In Carrier Phase Of Global Navigation And Positioning System

In 1990s,GNSS RTK network technology as a new technology has been widely applied.Because of its wide range of operations,high precision,good stability and so on,it has a wide range of applications and areas.Due to the short measuring distance(usually in the 10?15km),the measurement of environmental requirements and other issues in traditional RTK technology.People propose the concept of network RTK.The network RTK technique is based on an algorithm proposed on carrier phase observations.And the network RTK solve the problem of the short measuring distance,real time dynamic measurement under the centimeter,level positioning accuracy and other issues.In this paper,We introduce the composition principle and algorithm of network RTK system.We discuss the cycle slip detection and repair in carrier phase and the determination of ambiguity.We analyze three main algorithms of network RTK technology and use these algorithms to judge the positioning accuracy.Through the experimental results.We analyze the effects of altitude,rmedium and long baseline,satellite geometry and initial coordinates of the station on the positioning accuracy.In this paper,we discuss these following aspects,and obtain these corresponding conclusions:1.Based on the analysis of the basic principles of GNSS network RTK technology,we understand the various combination layers of the system and its application,study the establishment of the error model in the data,discuss the carrier phase in the cycle of the detection and repair,understand the determination of ambiguity throughout the week.2.We study the interpolation method,the linear combination method,the virtual base station method principle,and use the North Compass equipment equipment to obtain data.With three points as the base station and a point as a mobile station.We use the above three algorithms to calculate the rover coordinates,analyze the results and verify the accuracy and reliability of the algorithm.3.We adopt the base station data,analysis the effects of medium.length baseline?satellite geometry?initial position of the rover on positioning accuracy.The paper gives an analysis of the coordinates of the baseline length,the difference between the different cut.off angle on the DOP and the initial position.