Chapter 8 High-Resolution DOA Estimation with Higher-Order Statistics Pascal Chevalier, Anne Ferréol, Laurent Albera 8.1 INTRODUCTION Direction-of-arrival (DOA) estimation is one of the main components of spectrum-monitoring and radio surveillance systems, but it also finds its place in radar, sonar, and human electrophysiology for localization of electromag- netic activities. From the beginning of the 1980s, many second-order (SO)