The Research And Application Of Free From Leveling Measurement Technology Of Intelligent Total Station

In the routine total station survey process,before the formal observation,it is generally necessary to carry on the neutralization leveling operation.With the improvement of modern surveying technology and the continuous development of high-speed railway surveying technology,some traditional surveying habits have been broken.For example,total station and free station in high-speed railway precision survey do not need to be calibrated.In some practical work,leveling the total station is time-consuming and laborious,which affects the measuring efficiency.In view of this,this paper studies the free from leveling measurement technology of intelligent total station,the main research contents include the following points:Firstly,through the observation experiment on the measurement accuracy of 3D observation value under the condition of total station unevenness,it is verified that the precision of the oblique distance measured by the intelligent total station in free from leveling state is higher.the observation of total station in the state of leveling and free from leveling has little effect on the accuracy of oblique distance observation.At the same time,according to the verification experiment of 3D coordinate calculation model when the total station is not leveling survey,the three-dimensional coordinate calculation model of total station in the state of unevenness is verified.Secondly,the related algorithms for measuring the three-dimension rear distance intersection of the total station are studied.The geometric elimination method and the analytic elimination method are introduced to solve the approximate coordinates of the three-dimension rear distance intersection point,and the adjustment algorithm and accuracy evaluation model are derived.Finally,the experimental data are used to verify the above algorithm.At the same time,the adjustment results of two elimination methods are compared and analyzed.Thirdly,the measurement and data processing method of the free measuring station with the total station unevenness is proposed.Instead of the rotation matrix in the spatial coordinate transformation model,the Rodrigo matrix is used to solve the coordinate transformation parameters directly.Coordinate transformation from unknown coordinates to engineering independent coordinates system in station center coordinate system is realized.At the same time,through the comparison of the results of Rodrigo matrix spatial coordinate transformation model and Bursa spatial coordinate transformation model based on experimental data,it is concluded that the spatial coordinate transformation model based on Rodrigo matrix can be applied to the spatial coordinate transformation of any rotation angle,and the conversion accuracy is high.Fourthly,under the premise of the existing track ride comfort detection technology and method,this paper introduces the application thought and method of the free from leveling survey technology of total station in detecting track ride comfort.The relationship calculation model of instrument center coordinate and track midline coordinate of total station and the calculation method of 3D measured coordinates on the top of the rail are deduced.