The correction of near-field RCS of canonical shape calibrators

As we know, it´s very difficult to describe clearly the near-field scattering characteristic, as its scattering condition in near-filed, namely, the spherical-wave illumination and non-uniform irradiation, is strictly relative to the distance. Also when carry out the measurement, it is necessary to get the related information of the calibrator. In this paper, basing on the surface reflection algorithm and edge diffraction equivalence theory, we derived equivalent correctional equations of the near-field RCS canonical calibration bodies. In the final, we compared the calculation results with the measurement´s, which agree well with each other and shows that the conclusion can be used for the future work to effectively reduce the calibration error.