Doppler Orbitography and Radio-positioning Integrated by Satellite (CORS) observations from 37 Global Navigation Satellite System (GNSS) stations located in the Western Ukraine area were processed using Bernese Processing Engine module (BPE) of Bernese GNSS Software version 5.2 for a time span of about 2.5 years. To get a better agreement for constrains, the IGS stations closest to the surrounding area of study were chosen with fixed coordinates of ITRF2008 at epoch 2005.0.
The influence of the time length of observations, vector length and minimum height of the satellites above horizon for the determination of vertical component of GPS measurements was investigated. The GPS method vas derived. The accuracy for the determination of the elevation between GPS method and classic leveling was compared.