权的确定方法在核电施工控制测量中的应用探讨

Discussions about How to Determine Weight in NPP's Construction Control Surveying

在精密工程测量中,确定非同类观测值之间权的正确比例关系,对提高平差成果的质量具有重要意义。针对核电施工控制测量中,普遍采用高精度全站仪建立边角网、测量数据平差处理时按经验定权的现状,将Helmert验后方差定权引入核电测量数据处理,结合实际工程算例,阐明了二种定权方法之间的关系;克服了观测值先验精度与观测实际不符时定权不准确的不足;根据法方程及Helmert估算公式的特点,对工程中有效运用Helmert验后方差估计方法,进行了探讨。

It＇s important to determine the proper proportion of different sorts of observations＇ weight in order to improve the calculation quality during high precision engineering surveying.Set up a triangulateration control network with high accuracy electronic total station is commonly used in nuclear power plant（NPP） projects and observations are adjusted with experienced weight within which the observations＇ deviation come from experience instead of the practical conditions.So Helmert variation estimation has been suggested to process the data instead of the traditional method and the relationship between them has been shown by an example which comes from a real project,and some beneficial suggestions are also given in order to use the latter more efficiently.