Abstract
In this article, we propose a novel method of estimation of crack orientation on a metallic surface using linearly polarized circular synthetic aperture radar (SAR) imaging. We modeled a crack using a thin linear scatterer and considered the rotation of polarization basis vectors that were designed to match a predefined orientation vector corresponding to a temporary estimate of the orientation of the linear scatterer. The radar image intensity was expected to be a maximum when the specified orientation vector exactly matched the true scatterer orientation angle; therefore, to estimate the orientation of the scatterer, we aimed to obtain the maximum intensity of the image by varying the orientation vector. We validated the proposed scheme of estimation via a numerical electromagnetic simulation using the method of moments (MoM) and laboratory measurements carried out in an anechoic chamber. In this experiment, a metallic plate with slits was used as a simple surface crack model and the root-mean-square error and maximum error of the angular estimation were 1.9° and 5.1°, respectively.
Original language | English |
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Journal | IEEE Transactions on Instrumentation and Measurement |
Volume | 70 |
DOIs | |
State | Published - 2021 |
Keywords
- Circular synthetic aperture radar (SAR)
- crack orientation estimation
- linear polarization
- polarization basis
ASJC Scopus subject areas
- Instrumentation
- Electrical and Electronic Engineering