This paper studies effects of random anisotropic ionospheric irregularities on the residual error of dual-frequency GNSS measurements. For this purpose, in the phase path equation we take into account second- and third-order corrections associated with geomagnetic effects and ray path bending in the presence of random irregularities respectively. We also examine the influence of the orientation of ionospheric irregularities along geomagnetic field lines (the so-called anisotropy of irregularities) on the third-order residual error of dual-frequency measurements. We simulate the residual error to investigate the conditions under which this effect becomes most significant.
We develop an approach that uses simultaneous measurements of pseudo-distances from two GNSS navigation satellites made with a single-frequency receiver for an hour period to perform local correction of an ionospheric background model for current situation. Within the analytical component of a single-layer ionospheric model, we conduct a comparative analysis of the degree of influence of variations in the basic parameters of vertical electron density profile on pseudo-distance variations. We have established that critical frequency variations make the most significant contribution. Also important, however, is the consideration of electron density variations at heights well above the maximum. We present principles of the proposed correction method.
We study peculiarities of GNSS phase fluctuations caused by anisotropic irregularities. We have found regions with a higher level of phase variance and analyzed its causes.
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