Abstract
To process GPS and GLONASS measurements together, we choose the stochastic model which depends on the satellite elevation angles. We estimate the model coefficients at 17 IGS stations. The results show that the chosen model is suitable for GNSS measurements. The GPS carrier phase measurements have better accuracy than the GLONASS carrier phase measurements about 1.2 times. Meanwhile, the GLONASS code measurement error is 3.5 times lager than GPS.
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