Study of millimeter wave imaging of conducting objects
Date Issued
2010
Date
2010
Author(s)
Wei, Cheng-Lun
Abstract
This thesis mainly describes the study of millimeter-wave imaging of conducting objects. Based on the scattered field recorded over a scanned aperture at the backward direction of the conducting object, Chapter 2 derives the formulation to reconstruct the millimeter-wave images of the scattering objects. In Chapter 3, the simulation of the object scattered field is conducted by using discrete points to represent the scattering centers over the conducting object, then uses Fourier transformation to reconstruct the millimeter-wave image of the scattering object.
In the theoretical analysis, the scattering conducting object is illuminated by a plane wave, under physical optics approximation, the relation between the scattering object and its scattered field over the backward scanned aperture is derived, and then under a reasonable approximation, millimeter-wave image of the scattering object can be reconstructed through two-dimensional inverse Fourier transformation. Therefore by properly controlling the frequency, distance and size of scanned aperture, one can acquire the reasonable quality and resolution of the scattering object image. In this thesis, simulations of different scattering objects, including single point object, multiple point object, as well as complex shaped airplane and pistol are conducted to study the relationship between the scattered field and the formation of image.
Subjects
millimeter-wave image
scattering formula
imaging formula
Type
thesis
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