Effects of Induced Field Rotation from Rough Surface on H-Alpha Decomposition of Full-Polarimetric GPR

Zejun Dong, Xuan Feng, Haoqiu Zhou, Cai Liu, Motoyuki Sato

Research output: Contribution to journalArticlepeer-review

Abstract

The full-polarimetric ground-penetrating radar (FP-GPR) can obtain the polarimetric attributes of targets and achieve more accurate identification compared with traditional GPRs. However, in most cases, the polarimetric signals collected by GPRs are not only from the targets but also from the ground surface. According to the classical Fresnel formulas, the polarized directions of the waves will change after transmissions due to the difference in the transmission coefficients between horizontally and vertically polarized waves. This effect, called induced field rotation (IFR), will interfere with the acquisition of polarimetric attributes and also exists in the field measurements on a rough surface. In this study, we have derived the association between the measured FP-GPR data and transmission coefficients of the rough surface provided by the small perturbation method (SPM). The effects of IFRs from the rough surface on H-Alpha decomposition are analyzed later. The results show that the parameters of the rough surface will affect the values of components in the scattering matrix, but will not change the matrix and H-Alpha decomposition result; the incident angle and relative permittivity play main roles; for the H-Alpha decomposition results of three typical targets, the flat and dihedral are little influenced by IFRs, but the cylinder is seriously affected; simultaneously, a template for discriminating whether the calibration for H-Alpha decomposition is necessary is established. Both numerical and experimental tests validate the conclusions. Finally, a novel application strategy of H-Alpha decomposition is proposed, which has taken IFR from the rough surface into considerations.

Original languageEnglish
Pages (from-to)9192-9208
Number of pages17
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume59
Issue number11
DOIs
Publication statusPublished - 2021 Nov 1

Keywords

  • Full-polarimetric ground-penetrating radar (FP-GPR)
  • H-Alpha decomposition
  • induced field rotation (IFR)
  • rough surface
  • small perturbation method (SPM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Earth and Planetary Sciences(all)

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