Discusses linear, planar, and volume array theory; including near-field and far-field beam patterns, beam steering, and array focusing Presents the twin-line planar array and a linear array of triplets which are solutions to the port/starboard (left/right) ambiguity problem associated with linear towed arrays Explains the fundamentals of side-looking (side-scan) and synthetic-aperture sonars Examines the signal design of CW, LFM, and HFM pulses for range and Doppler estimation Explains the fundamentals of underwater acoustic communication signals such as MFSK, MQAM, and OFDM signals Discusses bistatic scattering for moving platforms with derivations of exact solutions for the time delay, time-compression/time-expansion factor, and Doppler shift at a receiver for both the scattered and direct acoustic paths Discusses target detection in the presence of reverberation and noise