Joint DOA and Polarization Estimation Based on Multi-polarization Sensitive Array

A joint direction-of-arrival (DOA) and polarization estimation method based on multi-polarization sensitive circle array and joint spectrum in polarization and spatial domains has been investigated. Multi-polarization sensitive array is composed of several elements with different polarizations, which can avoid signal energy loss caused by the polarization mismatch or shelter and can estimate DOA and polarization parameters of incident signal with arbitrary polarization effectively. In addition, this structure can be better applied to conformal antenna. The joint spectrum in polarization and spatial domains is defined by using MUSIC (multiple signal classification) method. The estimation accuracy and resolving power under different SNR (signal-to-noise ratio) and snapshots are investigated to measure the performance of the method based on this structure. The simulation shows good performance for DOA and polarization estimation of single signal, and the polarization discrimination can improve the resolution when two signals arrival in closely direction.