Array Design: Literature Survey For A High-Resolution Imaging Sonar System. Pt 1.

摘要

This report, together with the proposed Part 2, surveys the literature relevant to the design of a sonar array for imaging mines with a resolution approaching 1 mm. Written as a descriptive and sometimes critical review, the report draws out the connections to mine imaging. Background areas surveyed include acoustic propagation and scattering, signal processing and display. The theory of array beamforming is traced, beginning from basics and including the near field and broadband signals. Three-dimensional beamforming, by the delay-and-add method and by backpropagation (numerical holography), are discussed. Working systems and related development work are described, including sonar systems, high-resolution underwater imaging, imaging in medicine and nondestructive evaluation, synthetic aperture, acoustic holography and tomography. Ultrasonic imaging, Acoustic arrays, Beamforming Acoustic imaging, Ultrasonic arrays, Signal processing Sonar arrays, High resolution sonar.