Polarization domain coordinate mapping cancellation method based on least norm solution of compatible non-homogeneous linear equations

When the main lobe interferences and the desired signal have close polarization angles with the same frequency and direction of arrivals, the output signal to interference ratio of the oblique projection polarization filter (OPPF) will be degraded. Therefore, a polarization domain coordinate mapping cancellation method (PDCMCM) based on the minimum norm solution of compatible non-homogeneous linear equations is proposed to get better interference suppression performance in this paper. To achieve the purpose of suppressing the specific parameter signal, by constructing the suppression optimization matrix, the coordinate transformation is performed in the original parameter domain of received signal, and the orthogonal projection is done in the transformed parameter domain. Compared with the traditional polarization filtering method and OPPF, the proposed method has higher signal-to-interference ratio and strong robustness.