Initialization method and system of CP III three-dimensional control network

Abstract

The invention provides an initialization method and system of a CP III three-dimensional control network. The method comprises the steps that source coordinate system coordinates and target coordinate system coordinates of a plurality of datum points in the CP III three-dimensional control network are obtained respectively; according to the source coordinate system coordinates of the reference points, determining the source coordinate system coordinates of the fulcrums; according to the target coordinate system coordinates of the reference points, determining the target coordinate system coordinates of the fulcrums; according to the source coordinate system coordinates and the target coordinate system coordinates of the fulcrums, the source coordinate system coordinates and the target coordinate system coordinates of the plurality of reference points and the source coordinate system coordinates of the plurality of to-be-converted points, error equations of the plurality of to-be-converted points and each reference point are determined; constructing an error equation matrix according to the plurality of error equations; and according to the error equation matrix, determining target coordinate system coordinates of the plurality of to-be-converted points by using a least square method. According to the method, the calculation amount during initialization of the CP III three-dimensional control network can be reduced by constructing the error equation matrix.

Description

technical field [0001] The invention relates to the technical field of high-speed railway three-dimensional control network data processing, in particular to an initialization method and system for a CPⅢ three-dimensional control network. Background technique [0002] The CPⅢ control network is the benchmark for high-speed railway construction and operation and maintenance. Without the CPⅢ control network, the high ride comfort and high stability of the high-speed railway cannot be guaranteed. During the high-speed railway operation stage, it is necessary to retest the CPⅢ control network regularly. With the continuous increase of the mileage of high-speed railways in my country, the contradiction between the low efficiency of traditional CPⅢ control network field measurement and the daily narrow time windows of high-speed railway lines has become increasingly prominent. Therefore, it is imperative to study and establish a unified CPⅢ three-dimensional control network for th...

AI Technical Summary

Problems solved by technology

However, the CPⅢ three-dimensional control network is as long as the length of the line. Simply select three common points and use the Bursa model to perform rotation, scale transformation, and translation to complete the initialization. For high-speed railway lines with thousands of kilometers at every turn, the final coordinate conversion deviation is quite large , it is impossible to perform subsequent parameter estimation; if all the common points are selected, it is necessary to first use the three common points for initial coordinate transformation, and then use the Bursa model to obtain more accurate point coordinates through least squares estimation

Since the Bursa model is a nonlinear model, multiple iterations are required to obtain the optimal solution during the solution process. Obviously, this initialization method has a very heavy computational workload.

Images