轨道测量控制网包含GPS控制网、精密导线控制网和高程控制网。本文介绍了合肥市轨道交通3号线GPS控制网的基准设计、网的布设情况，通过对布网、外业观测和内业数据处理的分析，该项目数据处理方法合理，主要精度指标满足规范要求，可以作为合肥市轨道交通3号线施工的平面测绘基准，并对GPS技术在城市轨道控制测量中的应用总结了几点经验。%Surveying control network for metro include GPS control network ,precise-traverse net and elevation con-trol network.The paper introduced the datum design and layout of GPS control network .Through the analysis of net de-ployment ,field observation and data processing ,the major accuracy can meet the requirements of specification with rea-sonable data processing mothod ,this project can be used as surveying datum for line NO .3 Hefei rail transit .The paper put forward a little of experience about using GPS eechnology in the urban metro control survey .
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