To acquire true polarization scattering matrix (PSM) of target, the polarization performance of radar system is needed to be known. This paper proposes a measurement model for polarization error matrix. And in regard to the error caused by polarization basis mismatch, the measurement model is recast. A field-circuit co-simulation method is introduced to analyze the impact of polarization basis mismatch on the measurement results. The results show that the measurement of cross-polarization level and the amplitude of gV/gH (i.e. gain imbalance between two co-polarization channels) are deteriorated by the misalignment error, and the test of the phase of gV/gH is tolerated.
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