Analysis of resolution for an amplitude-steered array

Catherine H. Frazier, W. Jack Hughes, William D. O'Brien
2000 Journal of the Acoustical Society of America  
In 1976, Hughes and Thompson introduced the idea of steering the maximum response of a linear array by amplitude weighting the output signals of the elements, thus eliminating the need for time delays or phase-shift networks. Currently that amplitude-steered array concept is being extended to a broadband two-dimensional array that can be used for real-time three-dimensional imaging. In shifting the use of the amplitude-steered array from underwater acoustic communications to imaging, we must
more » ... sider different issues of the array's performance such as lateral and axial resolution. For the linear amplitude-steered array, we show that both lateral and axial resolution are limited by the length of the array. The dependence of axial resolution on the length of the array is a unique feature of the amplitude-steered array, leading to an interesting tradeoff between lateral and axial resolution. A theoretical basis for the dependence is developed and simulation results are given.
doi:10.1121/1.428629 pmid:10830365 fatcat:3se2xc7qnbcs5f3oulgun3jjuy