Probe-Compensated Microwave Holographic Imaging
Date Issued
2014
Date
2014
Author(s)
Chang, Jinjia
Abstract
A novel probe-compensated microwave holographic imaging method is proposed. Planar scanning by a directive probe antenna is adopted to reconstruct the images of unknown metallic or dielectric targets. Unknown targets are first illuminated by the probe antenna, and then the fields scattered from the targets are received by the probe. Directive or moderate-gain probe antennas are adopted since they are more sensitive to the scattered fields. To enhance the image quality, the proposed approach necessitates the detailed radiation information of the probe antenna and its environment. Theoretical formulation for image reconstruction is derived and verified by both simulations and experiments.
A series of imaging results based on FEKO simulations is presented to verify the efficacy of the proposed imaging approach. The effects of sampling rate on the image reconstruction are also investigated. Moreover, the experimental imaging system is also built up. A microstrip patch antenna that operates at X-band is chosen as the moderate-gain probe antenna. In addition to the monostatic imaging system, a quasi-monostatic system is also demonstrated. The quasi-monostatic system is more feasible and is capable of measuring the relatively weak fields scattered from dielectric targets.
Subjects
全像術
逆散射
微波成像
探針補償
Type
thesis
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