GNSS high precision velocity determination model considering satellite non-circular orbit correction

The calculation formula of satellite non-circular orbit correction and the processing strategy of high-precision velocity determination considering this correction were introduced.Observations of 12 IGS stations distributed around the world were used to evaluate the influence of the correction.The results show that the accuracy of velocity determination method based on carrier phase difference improve by 8％, 9％ and 10％ in E, N and U after correction, respectively and the accuracy of three-dimensional velocity is corrected from 9.9 mm／s to 8.9 mm／s.For the raw Doppler velocity determination method, the correction values of E and N are the same as the carrier phase difference method,and the correction value of U is about half of the carrier phase difference method.