Imaging With a 2 Mhz Sparse Broadband Planar Array

摘要

A portable high-resolution sonar has been under development to provide Navy Divers with an acoustic imaging systems for mine reconnaissance. The first phase of development was completed in 2000 with the demonstration of a broadband, 6% sparse line array, imaging a simple target in the NUWC Acoustic Test Facility (ATF). Element locations for this array were computed based on a grid point optimization technique which minimized close-in sidelobes. The center frequency was 2 MHz with a 667 kHz bandwidth. A new sparse planar array, consisting of 121 1 mm x 1 mm 2 MHz elements, has been fabricated, to provide 3- D acoustic images of underwater targets. This array was also designed using the grid point optimization technique. The first phase of testing with simple targets will be completed in 2001 for the planar sparse array.