Features of evaluating the accuracy for the results of phase measurements by means of satellite receivers

The article considers the main sources of errors when performing geodetic measurements by satellite methods, including: satellite ephemeris errors leading to inaccurate calculation of satellite coordinates at the time of measurements; change in the speed of propagation of electromagnetic waves in the troposphere and ionosphere, as well as short-term changes in the speed of propagation of radio waves (fluctuations); a change in the phase of the received signal caused by the reception of waves reflected from surrounding objects; deviations of wavelengths of carrier frequencies from the nominal value; noise of electronic units of receivers. In addition, the accuracy of calculating the determined quantities is affected by the number and location of satellites in the sky. The ways of reducing the influence of such sources of errors as: errors caused by the noise of the electronic units of the receivers and the noise of the troposphere and ionosphere (fluctuations of the refractive index of media); errors of the influence of reflected signals from surrounding objects. It is shown that the main attention should be paid to the analysis of the influence of changes in the propagation velocity of electromagnetic waves in the troposphere and ionosphere, the influence of satellite ephemeris errors, as well as taking into account the deviation of carrier frequency wavelengths from the nominal value, which will make it possible to develop a rigorous assessment of the accuracy of the determined quantities when performing geodetic measurements by satellite methods.