METHOD OF OBTAINING RADIO IMAGES OF EXTENDED OBJECTS Russian patent published in 2015 - IPC G01S13/89 

FIELD: radio engineering, communication.

SUBSTANCE: method is based on emitting probing signals and subsequently receiving reflected signals using a zone plate focused on a point of an object, the position in the longitudinal direction of which depends on frequency. Probing signals are emitted using a transmitting antenna mounted on the axis of the system within a first radioopaque Fresnel region of an axially symmetric zone plate; the beam width of the transmitting antenna corresponds to the angular sector of the monitoring zone, and the spectrum width of the emitted signal corresponds to the depth of said zone. In order to simultaneously receive signals reflected from points of the extended object, located at the same distance, a matrix of receiving elements is used, which is placed on the focal surface of the axially symmetric zone plate, after which signals received by elements of the matrix of receiving elements, having a defined frequency for constructing a picture of the scene which corresponds to a range-specific section, are used.

EFFECT: high rate of monitoring extended media and objects, and smaller dimensions of the focusing system.

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