Abstract: The quantity of two types of observation values are closely with each other and the additional observation values is relatively few,which are the obvious characteristics of undermine transverse adjustment.In order to improve the precision and reliability of the undermine large and control network,the dual-observation adjustment model is proposed based on the characteristics of the direct and reversed observation of undermine transverse control network and the more redundant observation required by posterior estimation.Compared with the classical adjustment models,the dual-observation adjustment model is characterized by more condition equations and easier to meet the estimation condition of posterior estimation,and then the precision can be effectively improved by determining the proper weight value by using posterior estimation.Taking the measure data of the undermine large traverse control network of a mine as the research example,the adjustment calculation is conducted,the results show that the difference between the azimuth angle adjustment values of the three known sides obtained by using the classical adjustment model and the true values are -10″,-12″,-15″respectively,the differences of the adjustment values obtained by the dual-observation adjustment model proposed in this paper and the true values are -10″m,-12″,-15″respectively,it is further indicated that the dual-observation adjustment model proposed in this paper can improve the precision and reliability of the nodes of the undermine large traverse control network by determining the reasonable weight values based on Helmert variance estimation method,therefore,it has some practical value to improve the adjustment precision of the undermine large traverse control network.

Key words: Traverse control network adjustment, Dual-observation adjustment model, Helmert variance estimation, Precision