Underground Cavity Detection through Group Dispersion of a GPR Signal

Caleb Leibowitz*, Anthony J. Weiss

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We present a novel method for underground cavity detection using cross-borehole ground-penetrating radar (GPR). Modeling the soil-cavity system as a filter allows us to estimate the group dispersion of the GPR signal induced by propagation through a cavity. We adopt a hypothesis-testing approach based on the observed group dispersion and propose a method which allows us to detect cavities with high probability. The proposed method is validated on both simulated and real measurements. Geologic clutter that causes conventional methods to fail has negligible impact on the efficacy of the proposed method, and the proposed method may be combined with conventional methods to provide a more robust and effective cavity-detection solution.

Original languageEnglish
Article number4808
JournalRemote Sensing
Issue number19
StatePublished - Oct 2022


  • cavity detection
  • ground-penetrating radar
  • void detection


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