Time-Reversal SAR Imaging for Nondestructive Testing of Circular and Cylindrical Multi-Layered Dielectric Structures

Abstract

In this paper, a synthetic aperture radar (SAR) approach, for imaging internal structures of generally lossy layered dielectric cylindrical objects, is presented. This method which properly accounts for different transmission and refraction path at each boundary between different layers, produces a properly focused image of embedded targets. This approach is also capable of addressing imaging needs for asymmetrical multi-layered cylindrical bodies. Consequently, this approach overcomes the limitation associated with the conventional methodology, in which free-space propagation is assumed. The calculation method of angular sampling criterion for circular and cylindrical SAR (i.e., circumferential and in height) are also presented. Electromagnetic simulations are performed on a three-layer cylindrical object, symmetrical and asymmetrical, with embedded targets to validate the approach. In addition, representative measurements are conducted at X-band (8.2-12.4 GHz) demonstrating the effectiveness of the approach for practical nondestructive evaluation applications.

Department(s)

Electrical and Computer Engineering

Research Center/Lab(s)

INSPIRE - University Transportation Center

Keywords and Phrases

Synthetic aperture radar (SAR); microwave imaging; circular SAR; cylindrical SAR; time reversal

International Standard Serial Number (ISSN)

0018-9456; 1557-9662

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 May 2020

Link to Full Text

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