Anti-interference method of main lobe of polarized array based on oblique projection

When the desired signal and the angle of incidence of the main lobe interference are almost the same, the spatial filtering fails. Therefore, it is a good choice to introduce the polarization domain information of the signal to filter out interference. However, under normal circumstances, the polarization state of the main lobe interference is unknown, so it is necessary to accurately estimate the polarization state of the main lobe interference first. In this paper, an anti-jamming method for polarized array main lobe based on oblique projection is presented, the polarization domain-space domain joint spectrum estimation of the signal is obtained by using a polarized array. The basic idea is similar to the music space spectrum estimation. Then, the difference between the polarization state of the desired signal and the main lobe interference signal is used to construct the oblique projection operator, and the effect of filtering the main lobe interference is achieved.