Direction of arrival estimation for conformal array with polarization diversity

A blind polarization direction of arrival(DOA) estimation method is presented based on the dual feed conformal array for polarization diversity signals. Through the projection and Euler rotation transformation, the equivalent steering vectors for co-polarization and cross-polarization signals are given out. The signal space is divided into the co-polar and cross-polar signal subspace, and the blind polarization separation of the two orthogonal polarization signals is realized. Based on this signal model, multiple signal classification(MUSIC) based method is proposed here to estimate the co-polar and cross-polar signal simultaneously without the estimation of polarization parameters. The maximum number of signal that can be estimated may exceed the element number. Simulation results illustrate the good performance of our method.