Joint Estimation of 2-D DOA and Polarization by Using the Linear Array with Diverse Polarizations

Antenna arrays with diverse polarizations havesome inherent advantages over the conventional uni-formly polarized array,for instance,higher accuracyof direction-of-arrival(DOA)esti mation,capabilityof resolving or separating signals based ontheir polar-ization characteristics as well as DOAs1-7].Thepresence of polarization diversity,complicates themeasurement model which introduces a relativelyhigher computational requirement8,9].Moreover,many existing algorithms proposed in the literature…

Joint Estimation of 2-D DOA and Polarization by Using the Linear Array with Diverse Polarizations

A linear array of diversely polarized antennas with one pair of identical sensors is used to obtain closed-form unambiguous estimation of 2-D direction of arrival (DOA) and polarization. Spatial phase information together with weighted 3-D polarization-angular coherence structure (PACS) are first recovered with fourth-order cumulants manipulation via a new 2-D ESPRIT variant. Spatial filtering is performed to obtain the scaled PACS, from which the closed-form 2-D DOA and polarization estimates can be derived with only quadrant ambiguity involved. The undesired quadrant ambiguity can be further resolved by using the acquired estimate of spatial phase factor.