Some aspects of array signal processing

The authors present an overview of some important aspects of array signal processing in the context of narrowband applications. Inverse methods are reviewed. Two case studies are presented. Different kinds of nonuniformly spaced linear arrays are also reviewed, with particular attention given to minimum redundancy and nonredundant arrays. The tradeoffs; namely, array span and sampling gain that decide the choice of one nonuniform configuration over another, are discussed. To aid in this study, the well known Cramer-Rao lower bound (CRLB) and the newly developed Weiss-Weinstein lower bound (WWLB) are computed for the simple and yet informative case of a single source under different conditions. A novel method for the adaptive (online) control of the measurement space (and therefore the amount of information available for parameter estimation) is described. Also included are real-time processing considerations, and a review of calibration array techniques