关键词: 测量控制系统;高程控制网;平面控制网;测量精度;测量等级;滇中引水工程;

Abstract: The Water Diversion Project in Central Yunnan (WDPCY) is characterized by large measuring area, high average altitude and large height difference change, which is the largest long-distance plateau water diversion project in China. The layout of construction control network in water conservancy projects is the foundation and basis of the project construction. The accuracy of the construction control network directly affects the measurement accuracy of water conservancy channels and buildings. Using the error theoretical analysis and simulation calculation method, the accuracy and grade of elevation control network and horizontal control network of the Water Diversion Project in Central Yunnan were analyzed. Through valuation calculation, the necessity of Sun Moon gravity correction of the elevation control network of the Water Diversion Project in Central Yunnan was analyzed. The results showed that the first level elevation control network of the Water Diversion Project in Central Yunnan should use the second-order leveling control network and then use the third-order leveling control network for encryption, and there was no need to correct the Sun Moon gravity of the elevation control network. The first level horizontal control network should adopt national level B GNSS network, and use the second-class horizontal network of water conservancy and hydropower as encryption. The research results provided theoretical support for the design and establishment of survey control system in Water Diversion Project in Central Yunnan, and served the construction of national major water conservancy projects with high precision.

Key words: survey control system; elevation control network; horizontal control network; survey precision; survey grade; Water Diversion Project in Central Yunnan