铁路CPⅡ和CPⅢ控制网同步测量与联合平差方法研究

Study on Synchronous Measurement and Combined Adjustment for Railway CPⅡand CPⅢControl Networks

为解决在多联、多跨连续纵向连接特殊梁体结构及特殊铁路轨道控制网测量时,快速准确获取CPⅢ控制点平面坐标的难题。传统CPⅡ和CPⅢ网采用不同的测量方式,由于观测的时间不同步,必然存在两次对中整平误差。研究采用CPⅡ与CPⅢ同步测量的方法,在满足GNSS观测和全站仪联测的任意位置摆设脚架的情况下,可节省CPⅡ埋桩费用;在安装的同时连接GNSS天线和棱镜的工装,可以减少两次对中整平误差。GNSS接收机观测CPⅡ与全站仪边角交会测量CPⅢ同步进行,以联测的起算点进行联合平差计算,能够满足相应级控制网等级的测量要求,提高了内外业工作效率,可在以后轨道控制网测量时推广应用。

The purpose of this paper is to solve the difficulty in obtaining the plane coordinates of CPⅢcontrol points quickly and accurately when measuring special beam structures and special railway track control networks with multi-connection and multi-span continuous longitudinal connections.According to the traditional mode,different measurement methods are adopted for CPⅡand CPⅢnetworks,so that there must be two alignment errors since the observation times are not synchronized.Synchronous measurement of CPⅡand CPⅢcontrol networks can save the cost of CPⅡpile burying under the condition that the tripod is arranged at any position meeting the requirements of GNSS observation and total station joint measurement.At the same time of installation,the GNSS antenna and prism toolings are connected,so as to reduce the two alignment errors.The observation of CPⅡby the GNSS receiver and the linear-angular intersection survey of CPⅢby the total station are carried out simultaneously,and the combined adjustment calculation is carried out with the starting point of the joint survey,which can meet the survey requirements of the corresponding level of the control network,improve the work efficiency of office and fieldwork,and can be popularized and applied in the future survey of the track control network.