摘要
在采用Helmert方差分量估计对三维控制网进行平差时,如果观测值带有粗差,参数估计则会受到影响,造成平差结果失真,无法得到准确的参数估值。将基于IGGⅢ模型建立抗差Helmert方差分量估计模型应用于平差计算中,并采集三维控制网数据进行实验。结果表明,抗差Helmert方差分量估计模型可以合理确定不同类观测值权比,抑制粗差影响,提高平差精度与可靠性。
Helmert parameter method of variance component estimation in adjustment of three-dimensional control network can be greatly influenced by the observations with outliers,which will result in the inaccurate paramater estimation.Robust helmert method of variance component estimation based on the model of IGGⅢ will be established by applying the model to the adjustment calculation,and experimenting with the three-dimensional control of network data.The results show that the robust helmert method of variance component estimation can reasonably determine the right ratio of different types of observations,effectively decrease the influence of the outliers and improve the accuracy and reliability of the three dimensional adjustment.
出处
《黑龙江工程学院学报》
CAS
2015年第3期9-11,32,共4页
Journal of Heilongjiang Institute of Technology
