Polarization Diversity Technology Research in Passive Radar Based on Subcarrier Processing

The work in this paper is divided into two parts. The first part is going to investigate the potential benefits of clutter suppression in a polarization filtering technology. The performance of a conventional polarization filter is limited by the complex electromagnetic environment. The subcarrier-based polarization filter (SC-PF) enhances the robustness to the environmental disturbance. The experiment results show that the SC-PF has a better clutter suppression performance compared with a conventional polarization filter. The average signal-to-noise ratio increases about 5 dB in airplane detection and about 8 dB in drone detection. The other part is the preliminary analysis of target polarization characteristics. With the extraction of the polarization amplitude ratio (PAR) of the airplane and drone, the PAR characteristic of airplane fluctuates dramatically and the PAR characteristic of drone fluctuates relatively smooth. Therefore, the difference of PAR characteristics of different targets may be helpful in target classification and recognition.