Variants of ray ionospheric radiotomography (RT) are considered: the phase RT based on measuring the absolute phase or the total electron content and the phase-difference RT based on measuring the phase-difference RT based on measuring the phase difference or Doppler frequency. The phase technique is shown to give poor results with typical errors in determining the absolute phase. The previously developed technique of the phase-difference RT is presented.
Abstract. A number of radio tomography schemes of the ionosphere and near-space environment (Earth's magnetosphere, plasmasphere, and protonosphere) are analyzed by utilizing multisatellite systems. A new approach to space-time tomography is proposed. It is shown that application of high orbital systems of Global Positioning System and Global Navigation Satellite System type with ground-based receivers is promising in the case of space-time tomography. Computer simulation results showed the possibility of realizing radio tomography of the near-space environment with the help of some multisatellite systems.
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