| Orbit control network (CPⅢ) provides plane and elevation benchmark for track laying and operating maintenance of high speed railway. In the measurement of high speed railway engineering (hereinafter referred to as the "specification") on the CPⅢ accuracy characteristics of control network, net shape and observation method, adjustment calculation method as the main research object, the CPⅢ part in need of improvement are discussed. Put forward to the method of improving the CPⅢ field observation efficiency and precision. Through the analysis of the characteristics of CPⅢ observation data and the data processing method, design The adjustment program. This article main research content is as follows:First, the observation of CPⅢ plane control network method and observation were analyzed. CPⅢ plane net accuracy requirement is high, the observation time is tight, using free station measure marginal intersection method, generally every move station about120meters, can meet the requirements of high-precision control network, and high efficiency. But difficult under the condition of every station can only move around60meters, the efficiency is low. In view of the difficult conditions control network observation efficiency is low, in this paper, the existing network shape changes, and puts forward a new observation form, to some extent improve the efficiency of the observation.Second, CPⅢ elevation control survey are analyzed using the general method and observation. Existing CPⅢ leveling generally one-way leveling network structure with rectangular ring network observation, can meet the requirements of the accuracy of the CPⅢ elevation, but still have room to improve efficiency. From improve the measurement efficiency and reduce labor intensity observer’s point of view, put forward the X and Z structure network observation.Third, respectively, the comprehensive analysis of the CPⅢ plane control network and elevation control network adjustment principles and methods. Introduced from the results of observation data to the whole process. In plane control network, the content including observation data preprocessing, observation of side length value of the two correction calculation, general coordinate calculation method, the error equation of column, observations of fixed weight method, the accuracy of the evaluation result.Fourth, the CPIII control network probes into the problems in the process of data processing. Combining with the characteristics of computer principle of peace, discussed the CPIII suitable for computer control network adjustment method. Introduces the history of highest law and its application in CPIII control network adjustment, the control network adjustment process optimization method, additional system parameter adjustment method of gross error detection methods and their applications in the adjustment.Fifth, according to the data processing method of this paper are introduced of plane and vertical adjustment program, verify its validity and practicability. Combining with the relevant data processing theory is introduced in this paper, the measured data of CPIII plane net adjustment result was analyzed, and results show that the side length of error calculation formula of different influence on adjustment results can be ignored, right to shall adopt Helmert variance component estimation at the same time, the reasonable evaluation of the quality of the monitoring results. |
