随机模型对GPS网平差结果的影响

指出根据观测数据对随机模型验后估计的意义，介绍随机模型验后估计的理论和方法及GPS基线网平差的数学模型，研究用方差分量估计与非负估计方法对不同时段不同分区的方差协方差矩阵进行估计，以评定基线观测值的质量，同时研究它对参数估计的影响，算例的计算结果表明，方差分量估计正确与否对GPS网平差结果的影响可达6mm。因此，在GPS网平差中，合理估计方差分量并定权对改善平差结果具有积极意义。

Influence of stochastic model on adjustment results of GPS network

This paper points out the meaning of posteriority estimation of stochastic model based on the observation data.It introduces some methods of posteriority estimation of stochastic model and the mathematical model of baseline network adjustment.At the same time it studies on the estimation methods by means of variance components estimation and non-negative estimation on the variance-covariance matrix of dissimilar time and different area so as to assess the quality of baseline observation.It also researches its influence on parameter estimation of variance components estimation.The example indicates whether the variance components estimation is right or not will affect the adjustment result of GPS network of 6 mm.So it has active significance in order to improve the adjustment results of GPS network if we can estimate the variance components reasonably and give it a right weight.