Abstract

During the process of the National Spatial Coordinate System construction, theoverarching GNSS network (temporarily called the GNSSnetwork tier A) is very important.The measured values of the GNSS network tier A play a role as the measured residua lvalue, therefore, after pairing adjustment based on the coincided points, the accuracy of the geodetic heights of the ground points were improved - this is one of the very important requirements to set the premise for the construction of the National Spatial Coordinate System. This paper presents the theoretical basis of pairing adjustment of the GNSS network into the National Space Coordinates System, and empirical calculations. The results ofempirical calculations showed that, the accuracy of the geodetic heights were improved up to 4 times, after performing the pairing adjustment.m