AN OVERVIEW OF WAVEFIELDS -- Types of Wavefields and the Governing Equations -- Wavefield in Open Space -- Wavefield in Bounded Space -- Stochastic Wavefield -- Multipath Propagation -- Propagation through Random Medium -- SENSOR ARRAY SYSTEMS -- Uniform Linear Array (ULA) -- Planar Array -- Broadband Sensor Array -- Source and Sensor Arrays -- FREQUENCY WAVENUMBER PROCESSING -- Digital Filters in the w-k Domain -- Mapping of 1-D into 2-D Filters -- Multichannel Wiener Filters -- Wiener Filters for ULA and UCA -- Predictive Noise Cancellation -- SOURCE LOCALIZATION: FREQUENCY WAVENUMBER SPECTRUM -- Frequency Wavenumber Spectrum -- Beamformation -- Capon's w-k Spectrum -- Maximum Entropy w-k Spectrum -- SOURCE LOCALIZATION: SUBSPACE METHODS -- Subspace Methods (Narrowband) -- Subspace Methods (Broadband) -- Coded Signals -- Array Calibration -- Source in Bounded Space -- ESTIMATION -- Weiner Filters -- Minimum Variance (Capon Method) -- Adaptive Beamformation -- Beamformation with Coded Signals -- Multipath Channel -- TOMOGRAPHIC IMAGING -- Non-Diffracting Radiation -- Diffracting Radiation -- Broadband Iluumination -- Reflection Tomography -- Object Shape Estimation -- IMAGING BY WAVEFIELD EXTRAPOLATION -- Migration -- Exploding Reflector Model -- Extrapolation in w-k plane -- Focused Beam -- Estimation of Wave Speed -- INDEX.