水利水电技术（中英文）

全站仪自动化监测系统采用的极坐标差分法是以参考点作为基准，对同期各观测值按比例进行改正，因此测站点、定向点、参考点是否稳定可靠，直接关系到监测结果优劣。为有效解决这一问题，在项目实施过程中，首先对大坝外部安全监测控制网历年复测成果进行统计分析；然后在自动化系统改造前、后分别对平面监测控制网各进行一次复测；最后根据复测成果，利用假设检验理论，对监测网各网点的稳定性分别做出评价，以明了网点的跨年度变化以及自动化监测设施建造可能产生的施工扰动影响。综合上述三项分析结果找出最为可靠、稳定的网点，以确定监测网适宜的起算基准点和平差模型，并对最新一期观测数据重新计算处理。上述方法一方面保障了自动化系统改造后部分网点作为定向点或参考点坐标应用的正确性；另一方面，网点作为后视点也保证了通过多点后方交会方式观测系统测站点坐标的准确性，从而获得系统正确的监测成果，也使电站安全监测数据在改造前、后能够顺序衔接、平稳过渡。

The polar coordinate difference method adopted by the automatic monitoring system of the total station is to take the reference point as the benchmark and correct the observation values in the same period in proportion. Therefore, whether the survey station, orientation point and reference point are stable and reliable is directly related to the quality of the monitoring results. In order to solve this problem, this article first conducts a statistical analysis of the retest results of the dam external safety monitoring and control network over the years in the process of project implementation. Secondly, retests the plane monitoring and control network before and after the transformation of the automation system. According to the retest results and the hypothesis test theory, the stability of each network point of the monitoring network is evaluated respectively to study the inter annual change of the network point and the possible construction disturbance impact caused by the construction of automatic monitoring facilities. Based on the above three analysis results, this paper finds out the most reliable and stable network point, determines the appropriate starting datum point and adjustment model of the monitoring network, recalculates and processes the latest observation data. On the one hand, it ensures the correctness of the coordinate application of some network points as directional points or reference points after the transformation of the automation system. On the other hand, the net point as a back point of view, which also ensures the accuracy of the survey station coordinates measured by the Multipoint resection method, so as to obtain the correct monitoring results, and enable the sequential connection and smooth transition of the safety monitoring data of the power station before and after the transformation.