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This paper gives a description of the facilities for the combined calibration of the L- and VHF-band radars (λ ≈ 23 cm, SAR-23 and λ ≈ 180 cm, SAR-180, respectively) installed in the air-borne "MARS" system [1] where the MW delay lines are employed. The technique for the combined SAR calibration involves a periodic external calibration of point calibrated reflectors (transponders) being mounted close to the surfaces under study or on special testing sites as well as continuous internal calibration with indispensable recording of real carrier flight parameters [2].