Joint DOA, Range, and Polarization Estimation for Rectilinear Sources With a COLD Array

In this letter, a novel localization method for near-field (NF) rectilinear or strictly noncircular sources with a symmetric uniform linear array of cocentered orthogonal loop and dipole (COLD) antennas is proposed. Based on the rank reduction (RARE) principle, the multiple parameters including direction of arrival (DOA), range and polarization parameters are separated. Furthermore, a closed-form solution for polarization parameters and noncircular phases is also provided. The deterministic Cramer-Rao bound (CRB) of the estimation problem under consideration is also derived as a benchmark. Numerical simulations are provided to demonstrate the effectiveness of the proposed method.