Provided are an apparatus for measuring a radar cross section and a method thereof, estimating first and second surface current induced at an illumination region and a corner region of a scatterer by an incident electromagnetic wave using an approximation method of the physical optics and an approximation method of the physical theory of diffraction, estimating a third surface current induced into a dead region of the scatterer based on a first electromagnetic value by the first surface current estimated through the approximation method of the physical optics, a second electromagnetic value by the second surface current estimated through the approximation method of the physical theory of diffraction and a third electromagnetic value by the incident electromagnetic wave, calculating a first scattered electric field by repetitively calculating an initial surface current value resulted by summing the first and the third surface current through the repetitive approximation method of the physical optics based on a preset magnetic field integral equation, and calculating the total scattered wave electric field by summing the first scattered electric field with a second scattered electric field based on the second surface current, to measure the radar cross section. The present invention can enhance accuracy in measuring the radar cross section of the scatterer.
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