Abstract:The temperature of GNSS monument and the bedrock can be influenced by surface air temperature changes, which results in thermoelastic deformation and accumulates as displacement of GNSS station. The quantity analysis on thermoelastic effect is important in separating accurately the signals and noises in coordinate time series of GNSS reference stations. In this paper, based on correlation theory of elastic mechanics and thermoelastic mechanics, we give the analytical solution thermoelastic deformation of axisymmetric monument under one-dimensional temperature field. Results suggest that the vertical displacement of monument is dependent on the Poisson's ratio, thermal expansion coefficient, temperature difference and the height of the monument and bedrock. We propose a more rigorous thermoelastic effect model, with the vertical displacement of GNSS station caused by temperature changes being considered in three parts: the displacement of aboveground part of the monument, underground part of that, and the bedrock. We compare the difference between the proposed model and literature results.