Keywords
Antennas (Electronics), Imaging systems, Millimeter waves, Signal processing -- Digital techniques
Abstract
Millimeter-wave imaging has gathered attention in recent years for its ability to penetrate clothing, thin layers of soils, and certain construction materials. However, image quality remains a challenge that needs to be addressed. One way of improving image quality is by increasing the dimensions of the collecting aperture. A sparse array can be used to synthesize a larger aperture with a limited set of relatively small detectors. In this research we design, build, and test a test-bed having an active source at 94 GHz and an array of coherent detectors, mounted on arms that extend radially on a rotary table. Using this test bed a circular area with a maximum diameter of 900 mm can be scanned. The signal is down-converted using heterodyne receivers with digital in-phase and quadrature detection. Signal correlation is performed using the digitized data, which is stored for post-processing, electronic focusing, and image reconstruction. Near-field imaging using interferometric reconstructions is achieved using electronic focusing. Imaging tests show the ability of the system to generate imagery of concealed and unconcealed objects at distances between 400 and 700 mm. A study of the effects of redundant and nonredundant configurations on image quality for 4 common detector configurations is presented. In this document we show that an active sparse-aperture imaging system using digital correlators is a viable way to generate millimeter-wave images.
Notes
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Graduation Date
2010
Semester
Fall
Advisor
Boreman, Glenn
Degree
Doctor of Philosophy (Ph.D.)
College
College of Optics and Photonics
Format
application/pdf
Identifier
CFE0003406
URL
http://purl.fcla.edu/fcla/etd/CFE0003406
Language
English
Release Date
December 2010
Length of Campus-only Access
None
Access Status
Doctoral Dissertation (Open Access)
Subjects
Dissertations, Academic -- Optics and Photonics, Optics and Photonics -- Dissertations, Academic
STARS Citation
Caba, Wilson Ariel, "Application Of Antenna Synthesis And Digital Signal Processing Techniques For Active Millimeter-wave Imaging Systems" (2010). Electronic Theses and Dissertations. 1600.
https://stars.library.ucf.edu/etd/1600