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Comparison of digital beamforming algorithms for 3D terahertz imaging with sparse multistatic line arrays

 
: Baccouche, B.; Agostini, P.; Schneider, F.; Sauer-Greff, W.; Urbansky, R.; Friederich, F.

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Advances in radio science. Online journal 15 (2017), S.283-292
http://www.advances-in-radio-science.net/
ISSN: 1684-9973
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ITWM ()

Abstract
In this contribution we compare the back-projection algorithm with our recently developed modified range migration algorithm for 3-D terahertz imaging using sparse multistatic line arrays. A 2-D planar sampling scheme is generated using the array's aperture in combination with an orthogonal synthetic aperture obtained through linear movement of the object under test. A stepped frequency continuous wave signal modulation is used for range focusing. Comparisons of the focusing quality show that results using the modified range migration algorithm reflect these of the back-projection algorithm except for some degradation along the array's axis due to the operation in the array's near-field. Nevertheless the highest computational efficiency is obtained from the modified range migration algorithm, which is better than the numerically optimized version of the back-projection algorithm. Measurements have been performed by using an imaging system operating in the W frequency band to verify the theoretical results.

: http://publica.fraunhofer.de/dokumente/N-484265.html