Influence of variance components estimation on the adjustment results of GPS network
Shaofeng Xie, Yang Hai-bing, Wang Xin-qiao, Cui Shu-zhen, Zhou Qing-shan · Journal of Guilin University of Technology · 2006
The theory and methods of posterior estimation of stochastic model and the mathematical model of GPS baseline network adjustment are introduced.The study focuses on the methods by means of variance components estimation and non-negative estimation on the variance-covariance matrix of dissimilar session and different area so as to assess the quality of baseline observation.It also researches on the influence of parameter estimation of variance components estimation.The case study indicates whether the variance components estimation is right,it will affect the adjustment result of GPS network of 6 mm,providing an active significance undoubtedly to improve the adjustment results of GPS network when estimating the variance components reasonably and a right weight.This GPS network has different variance at different session.The result of MINQUE2 method proves to be the best one.