Broadband Near-Field Range and Bearing Estimation Based on Fourth-Order Cumulants

In the paper, the problem of broadband near-field source localization is investigated. A novel method for joint range and bearing estimation of broadband near-field sources is proposed using coherent signal subspace method (CSM) and fourth-order cumulant. The broadband of near-field source is divided into multiple narrowband frequency bins. Coherent focusing of the received data over multiple frequency bins is studied. To estimate the ranges and bearings for near-field sources, a cumulant-based subspace method is then presented to obtain estimated parameters from eigenvectors and eigenvalues of the eigen-decomposition of the cumulant matrix. Compared with 2D-MUSIC method for broadband near-field localization, the advantages of the proposed method lie in that multiple-dimension search computation is not required and Gaussian colored noise is effectively removed.