Analysis of resolution for an amplitude-steered array

Catherine H. Frazier, W. Jack Hughes, William D. O'Brien

Research output: Contribution to journalArticlepeer-review


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 consider 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. (C) 2000 Acoustical Society of America.

Original languageEnglish (US)
Pages (from-to)2430-2336
Number of pages95
JournalJournal of the Acoustical Society of America
Issue number5 I
StatePublished - 2000

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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