T-12: Underdetermined Wideband Direction of Arrival Estimation and Target Localization: Part 1

In this tutorial, we will first give an introduction to the general area of wideband array signal processing including both beamforming and direction of arrival (DOA) estimation and answer a key basic question, i.e. what is wideband and how wide is wideband? Then, we briefly review some traditional narrowband approaches to DOA estimation and show how they are extended to the wideband case. Thirdly, we will focus on the underdetermined DOA estimation problem and the approaches for underdetermined wideband DOA estimation are divided into two classes: one is direct extension of the underdetermined narrowband DOA estimation approaches to the wideband case in the frequency domain; the other one is some unique approaches for the wideband case and the focus is on how to exploit frequency diversity of the signals to increase the degrees of freedom (DOFs) of the system. Theoretical analyses based on the derived Cramer-Rao bounds (CRBs) will be provided to show the increased DOFs in theory. Finally the tutorial will move to the underdetermined wideband target localization problem and the main difference compared to the DOA estimation problem is that here multiple distributed wideband arrays are employed to uniquely identify the locations of targets.