Coordinate system transformation for deformation monitoring datum network based on robust estimation

In order to monitor the effect of underground coal mining on the main and auxiliary wells in the industry square,the GPS datum network composed of 10 points is established to provide deformation analysis datum under coordinate system in mine area for well monitoring network composed of 54 monitoring points.When the coordinate transformation parameters are solved,in order to eliminate the impact of the displacements existing in the transformation reference points,the robust estimation model and data processing flows are introduced.The quality evaluation model for transformed GPS network is also established.According to the processed results of the GPS datum network,the robust estimation model of solving transformation parameters is favorable for reserving the high precision characteristics of GPS technology.