Application Research Of Three-Dimensional Adjustment Technology In High-Speed Railway Track Control Network

In recent years,with the improvement of total stations’measuring accuracy.it is a trend that to establish three-dimensional engineering control network by three-dimensional adjustment which using the horizontal direction,slope distance and zenith distance got by total station. There are some deficiencies that the plane and vertical control network built separately of traditional high-speed railway track control network (CPIII).This thesis will researchs on three-dimensional adjustment and precision evaluation for CPIII, so as to achieve the goal that establish vertical control network not by leveling.For this goal,this thesis researchs on the three-dimensional adjustment of CPIII network,mainly related to the content of the following three parts:Firstly,the feasibility of CPIII three-dimensional adjustment is analyzed by analysing CPIII features and measurement characteristics.Studies on the theory of CPIII three-dimensional adjustment,deduces the method of calculating unknown parameters’ approximation which suitable for CPIII three-dimensional adjustment,establishes out error equations of horizontal direction,slope distance and zenith distance,gives out the method of establishing the weight for three types of observations,analyses the impact of the adjustment caused by the atmospheric refraction and vertical deflection.Secondly,designs the function and calculation process of the three-dimensional adjustment software,develops the three-dimensional adjustment and precision evaluation software for CPIII.This thesis makes the theoretical research come true by using C#programming language.CPIII TDAS software has the common functions which meet the three-dimensional adjustment,such as project management,data pre-processing,network adjustment calculation and graphical display.Thirdly,this thesis does three-dimensional adjustment calculation for CPIII data by using the self-software CPIII TDAS and compares adjustment results with the results done by other software certified with authoritative departments,has verified the correctness of the three-dimensional adjustment’s theoretical research and software development.Statistics and analysis the impact of three-dimensional adjustment by experience weighting and Helmert variance weighting,trying to find out the right weighting method for CPIII three-dimensional adjustment.