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PRELIMINARY PROCESSING OF DATA FROM A SATELLITE NAVIGATION RECEIVER IN THE PROBLEM OF THREE-DIMENSIONAL UPPER IONOSPHERE TOMOGRAPHY

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The problem of three-dimensional tomography of the upper ionosphere based on the signals of global navigation satellite systems obtained by the navigation receiver of a low-orbit satellite is considered. A method for preliminary processing of data from a satellite navigation receiver is presented, which consists in predicting the coordinates of the centers of mass of a low-orbiting satellite and navigation satellites, estimating the total electron content of the ionosphere with subsequent rejection of emissions, and also choosing a reconstruction area. The technique was tested with data obtained from the navigation receiver of the spacecraft from the FormoSat-7/COSMIC-2 meteorological satellite constellation. The results of the total electron content estimation make it possible to apply the algorithm for the continuous solution of the problem of three-dimensional tomography of the ionosphere, which, in turn, allows us to estimate the electron concentration of the ionosphere in the upper ionosphere.

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