Костиря , О.О., Гризо, А.А., Додух, О.М. and Нарєжній, О.П. 2023. Improvement of Mathematical Models with Time-Shift of Two- and Tri-Fragment Signals with Non-Linear Frequency Modulation. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia. 93 (Sep. 2023), 22-30. DOI:https://doi.org/10.20535/RADAP.2023.93.22-30.