A modified algorithm for accurate GPR wave velocity estimation with common offset setting antenna

Fei Xie, Janet Fung Chu Sham, Wallace Wai Lok Lai, Xavier Dérobert

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Accurate wave velocity estimation is an important part to determine the quality and reliability of GPR survey results, such as positioning of underground utility and characterization of materials. An algorithm was proposed to estimate the velocity accurately by modeling the GPR signal travel path. Both the effects of factors of antenna separation and radius of cylindrical target were taken into account. This model helped to establish a nonlinear relationship among the parameters of horizontal displacement of antenna, GPR signal travel time, wave propagation velocity. Levenberg-Marquardt iteration method was used to solve the non-linear least square fitting. Validation experiments were conducted in lab environment. The reflection data of an Y25 steel bar in air at depth 0.2m, 0.3m, 0.4m and 0.5m were extracted to test the algorithm. Errors of the estimated velocities is around 2% to 3% which is quite small and acceptable in reality. It is believed that this algorithm is qualified for future accurate GPR positioning survey and condition survey.

Original languageEnglish
Title of host publication2018 17th International Conference on Ground Penetrating Radar, GPR 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781538657775
DOIs
Publication statusPublished - 20 Aug 2018
Event17th International Conference on Ground Penetrating Radar, GPR 2018 - Rapperswil, Switzerland
Duration: 18 Jun 201821 Jun 2018

Publication series

Name2018 17th International Conference on Ground Penetrating Radar, GPR 2018

Conference

Conference17th International Conference on Ground Penetrating Radar, GPR 2018
Country/TerritorySwitzerland
CityRapperswil
Period18/06/1821/06/18

Keywords

  • accuracy
  • algorithm
  • GPR
  • velocity estimation

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Instrumentation

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