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A novel poladmetric calibration method for new target property measurement radar system is presented.Its application in the real radar system is also discussed.The analysis indicates that instantaneous polarization radar (IPR) has inherent cross-polarization measurement error.The proposed method can effectively eliminate this error,and thus enhance the polarization scattering matrix (PSM) measurement precision.The phase error caused by digital receivers direct iF sampling and mixing of two orthogonal polarization channels can be removed.Consequently,the inherent error of target polarization scattering measurement of the instantaneous polarization radar system is well revised.It has good reference value for further plcarimetric calibration and high practical application prospect.