Far field properties of wide band planar arrays with nonlinear processing

A planar array is a known arrangement of signal receiving elements upon a plane; the element outputs are combined linearly after suitable processing at each element. This paper examines the directional sensitivity of a planar array excited by one or more broadband sources when nonlinear signal processing occurs. I shall discuss the effects of: I) source spectrum and signal processing upon the directional sensitivity; II) perturbations in element position and gain upon performance; III) hard limiting upon signal-to-noise ratio, directional sensitivity, and angular estimation with several sources.