基于宽带极化纯度估计的极化测量定标修正

It is usually expected to accurately obtain the polarization characteristic information of each scattering center of the target under broadband high resolution conditions when measuring the polarization scattering characteristics of extended targets. However, the energy leakage of the scattered signals of each polarization component on the orthogonal polarization channel of the testing system will seriously affect the measurement accuracy of weaker polarization scattering components. Based on the calibration principle of polarization scattering measurement and the characterization model of broadband high resolution polarization measurement, the causes of interference and the mechanism of its impact on the scattering center test results are analyzed. A method based on broadband orthogonal polarization purity estimation is proposed to correct the polarization measurement results of complex targets. Its effectiveness is verified through three typical target measurements: metal balls, metal dihedral angle combinations, and warhead-like metal models.