B.D. Manuilov - Dr.Sc. (Eng.), Professor, Leading Researcher, FRPC «RNIIRS» M.B. Manuilov - Dr.Sc. (Phys.-Math.), PROFESSor, Southern Federal University D.V. Reznichenko - Engineer 2 cat., FRPC «RNIIRS» S.A. Strelchenko - Leading Engineer, FRPC «RNIIRS» V.B. Chernykh - Leader of Group, FRPC «RNIIRS»

A method for obtaining of the radio images of extended objects is proposed. The method is based on the frequency dependence of the axially-symmetric Fresnel-zone plate focusing behavior. The transmitting (Tx) antenna is placed on the axis of the imaging system within the opaque first Fresnel-zone before the axially symmetric Fresnel-zone plate lens. The beam-width of Tx antenna should correspond to the angular sector of the monitoring coverage and the signal bandwidth should correspond to the longitudinal depth of the monitoring coverage. The receiver matrix is placed on the focal surface of the axially-symmetric lens. So the reflected signals for the various points of the object cross-section are received simultaneously in focal receiver matrix. On the other hand, the signals of various frequencies are used for varying the distance between the observed cross-section of the object and the receiver matrix. The mathematical model of the focusing system based on binary Fresnel-zone plate lens is developed. The example of a technical implementation of the proposed method is considered. The potential characteristics of the suggested technique are evaluated numerically.