Aeronomic radio spectrometry with calibration by signals from virtual sources - O. M. Korolov; Yu. V. Karelin; O. V. Antiufieiev; V. M. Shulha; V. V. Myshenko; D. L. Chechotkin; D. V. Shulha; O. M. Patoka; K. V. Marynko (Radio Physics and Radio Astronomy, 2022)