Analysis of resolution for an amplitude steered array

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

Research output: Contribution to journalConference articlepeer-review


In 1976, Hughes and Thompson introduced the amplitude-steered array, which steered the maximum response of the 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 which 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. 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. We develop a theoretical basis for the dependence and give simulation results.

Original languageEnglish (US)
Pages (from-to)1231-1234
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
StatePublished - 1999
Event1999 IEEE Ultrasonics Symposium - Caesars Tahoe, NV, USA
Duration: Oct 17 1999Oct 20 1999

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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