V.I. Evseev1, I.O. Kolachev2

1,2 Baltic State Technical University “VOENMEH” named after D.F. Ustinov (Saint-Petersburg, Russia)

1 v.evseev43@mail.ru; 2 kolachev_io@voenmeh.ru

Problem statement. Modern high-resolution radars are often used as part of information measurement and control systems. A promising means of calibrating such systems is an active repeater (transponder), which allows controlling not only the effective scattering area of the standard, but also its location on the radar image electronically without the need to move equipment. However, such a displacement of the standard leads to defocusing of its image and a decrease in calibration quality, due to the imperfection of control methods used in modern repeaters.

Goal. To present a mathematical model of the phase distribution formation of radar signals reflected from virtual objects and to analyze the effect of the displacement of the virtual object relative to the transponder on the suitability of its use as a reference for radiometric calibration of radar.

Results. A mathematical model of the phase distribution formation of radar signals reflected from scene containing real objects and transponders is considered. A set of radar virtual objects with different offsets relative to the transponder was obtained, using the «range–Doppler» algorithm adapted to the radar used. The suitability of the objects for high-resolution radiometric radar was assessed based on these images. It has been found that it is difficult to qualitatively assess the permissible removal of a virtual object, at which it is suitable for high-resolution radar calibration tasks.

Practical significance. The proposed mathematical model may be used to develop new control methods designed for active repeaters, as well as to substantiate the characteristics of an object's image that determine its suitability for radiometric calibration of a radar as part of an information measuring and control system.

Evseev V.I., Kolachev I.O. Transponder model for radar calibration in information-measuring and control system remote sensing of the Earth. Radiotekhnika. 2025. V. 89. № 12. P. 135−146. DOI: https://doi.org/10.18127/j00338486-202512-15 (In Russian)

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