Topics in CT and SAR Imaging: Fast Back -Projection Algorithms and Optimal Antenna Spacings
Xiao, Shu
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https://hdl.handle.net/2142/80812
Description
Title
Topics in CT and SAR Imaging: Fast Back -Projection Algorithms and Optimal Antenna Spacings
Author(s)
Xiao, Shu
Issue Date
2001
Doctoral Committee Chair(s)
Munson, David C., Jr.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
Another study is motivated by the investigation of the phase unwrapping problem in 3-D SAR imaging. In this thesis, we study the optimal antenna spacings for pointwise terrain height estimation. In particular, we start from the maximum likelihood estimates of the terrain height. The ambiguous terrain height derived from any pair of antennas is modeled by a periodic waveform with each period having a Gaussian shape. For multiple pairs of antennas, the corresponding waveforms have different periods, which helps resolve the ambiguity. For the three-antenna case, a closed-form formula approximating the mean squared error (MSE) of the estimated terrain height is derived as a function of antenna spacing. By minimizing the MSE, we determine the optimal antenna spacing. The algorithm is tested with simulated data.
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