The manual covers the physical foundations of the operation of radar systems and complexes. Methods of measuring coordinates of moving and stationary objects are considered. The basics of statistical theory of radar are considered, which make it possible to assess potential radars when measuring and resolving parameters of processed signals. The textbook is intended for students of the Faculty of Radio Engineering, studying in the specialty 210601.65 "Radioelectronic Systems and Complexes," studying the discipline "Fundamentals of the Theory of Radar Systems" in the 8th semester.