基于直角坐标变换模型的CPⅢ平面控制网平差  

Adjustment of CPⅢ plane control network based on coordinate transformation model

作　　者：李建章[1] 李培天[1] 杨学超[1] 

机构地区：[1]兰州交通大学测绘地理信息学院,兰州730070

出　　处：《工程勘察》2013年第5期81-84,共4页Geotechnical Investigation & Surveying

摘　　要：传统的CPⅢ平面控制网平差以方位和距离作为观测值,采用Helmet验后方差估计定权。本文以测站点和观测点间基线向量作为虚拟观测值,利用最小范数二次无偏估计定权,基于二维直角坐标变换模型实现CPⅢ平面控制网平差。为了比较二维直角坐标变换方法和传统方法精度的高低,利用程序对多套模拟观测数据进行了解算,由误差分布图可知,二维直角坐标变换方法和传统方法达到了同等的精度。In traditional adjustment method of CPIII horizontal control network observation data are angles and distances, and their weights are determined by the Helmet method. In this paper, CPⅢ plane control network adjustment is done based on two-dimensional cartesian coordinate transformation model and the MINQUE is used to determine the weights of observations which are the baseline vectors from the observation sites to target points. In order to compare accuracy of adjustment between the two-dimensional cartesian coordinate transformation method and traditional method, a program is used to calculate several sets of simulated observation data. By the distribution of errors, we know that two-dimensional cartesian coordinate transformation method can achieve the same accuracy of traditional adjustment method.

关 键 词：CPⅢ平面控制网 直角坐标变换模型 最小范数二次无偏估计 

分 类 号：TU198[建筑科学—建筑理论] P209[天文地球—测绘科学与技术]