The Doily Project
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Scan day: 05 March 2014 UTC
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Description: Bioacoustics Research Lab at the University of Illinois at Urbana-Champaign.
William D. O'Brien, Jr. publications: In 1976, Hughes and Thompson introduced a linear amplitude-steered array, which steered the maximum response of the array by amplitude weighting the output signals of the elements, thus eliminating the need for time-delays or phase-shift networks [1]. The array was originally designed to operate with a narrowband signal. With a broadband signal, different frequencies are steered to different directions. Using this property, the linear version of the array can form an image using a single transmit pulse. Transmitting a linear FM chirp causes the main beam to be swept over a sector. An image is formed by time-frequency processing, where the elapsed time to the returned signal gives range information, and the frequency of the received signal provides information about the target's lateral position.
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| Page title: | Doily Project |
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