caa a22 4500 445305762 CHVBK 20180317142612.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s10762-011-9767-8 doi (NATIONALLICENCE)springer-10.1007/s10762-011-9767-8 Active Sparse-Aperture Millimeter-Wave Imaging Using Digital Correlators [Elektronische Daten] [Wilson Caba, Glenn Boreman] Millimeter-wave imaging systems have desirable characteristics, particularly in their ability to form images of objects obscured by various barrier materials. However, the relatively long wavelength of the millimeter-band implies a penalty in angular resolution, usually compensated using large-aperture systems. Synthesized apertures provide the desired collecting area with a reduced number of discrete detectors. In this research we designed, built, and characterized the performance of a prototype sparse-aperture imaging system, utilizing an active 94GHz source. Discrete sensors were used to sample the radiation field backscattered from the object. The signals were down-converted using heterodyne receivers with digital in-phase and quadrature detection. Signal correlations were performed using the digitized data sets to reconstruct millimeter-wave images. Image-quality performance was experimentally evaluated using four different non-redundant aperture configurations, with good agreement to the theoretical expressions. The feasibility of digital electronic-focusing correction was also demonstrated over an object range from 400 to 700mm. Springer Science+Business Media, LLC, 2011 Active millimeter-wave imaging nationallicence Aperture synthesis nationallicence Digital correlation nationallicence Digital phase detection nationallicence Caba Wilson CREOL - College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd., 32816, Orlando, FL, USA aut Boreman Glenn CREOL - College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd., 32816, Orlando, FL, USA aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/4(2011-04-01), 434-450 1866-6892 32:4<434 2011 32 10762 https://doi.org/10.1007/s10762-011-9767-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-011-9767-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Caba Wilson CREOL - College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd., 32816, Orlando, FL, USA aut NATIONALLICENCE 700 1- Boreman Glenn CREOL - College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd., 32816, Orlando, FL, USA aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/4(2011-04-01), 434-450 1866-6892 32:4<434 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer