At present, with the rapid development of high-speed railway construction, the engineering measurement accuracy requirements are increasingly high. The engineering surveying control network provides benchmark for datum plane measurement, and control network with high precision is one of the key technologies to ensure the success of high-speed railway construction. In order to meet the safety requirements of high-speed railway, GPS is used to build high-speed railway CP0, CPI, CPII control network, and this paper analyzes the layout principle and observation method of the three-plane control network, and then based on the GAMIT software, presents a the baseline scheme in the data processing of framework control network. On this basis, try to eliminate baseline error, select the scientific calculation software and calculation scheme, and put forward some principles and methods for the baseline network adjustment and other aspects, to improve the reliability and accuracy of baseline solution, thus improve the accuracy of the control network framework, and provide accurate and reliable initial basis for measuring plane.%目前,随着高速铁路建设的快速发展,对工程测量技术的精度要求也越来越高,工程测量控制网为平面测量提供起算基准,高精度的基准控制网是保证高速铁路成功建设的关键技术之一.为满足高速铁路的安全性要求,本文利用GPS建立高铁CP0、CPI、CPII控制网,并对三级平面控制网的布设原则及观测方法进行分析研究,然后基于GAMIT软件,提出了框架控制网数据处理中基线解算的方案.在此基础上尽量消除基线解算误差,选择科学的解算软件和解算方案,以及基线网平差等方面提出一些原则和方法,来提高基线解算的可靠性和精度,进而提高框架控制网的精度,为平面测量提供精准可靠的起算依据.
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