Migration trajectory and migration aperture of SAR-GPR in rough ground area

Xuan Feng, Takao Kobayashi, Motoyuki Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

SAR processing (or diffraction stacking migration) is an important signal processing method for ground penetrating radar (GPR) in many application case including landmine detection. It can improve signal-clutter ratio and reconstruct subsurface image, summing amplitudes along the hyperbolic trajectory that is Huygens surface (or diffraction travel time surface). For SAR processing, the travel time surface generally is smooth spherical surface in the case of zero-offset data and smooth ellipsoidal surface in the case of nonzero-offset data whose curvature is governed by the velocity function. But when the height of ground surface varies largely in the very rough ground area, for example mound, the travel time surface will be affected by the ground surface for the synthetic aperture - ground penetrating radar (SAR-GPR). In this paper we will consider the effect of the ground surface into the migration processing for the multi-offset CMP SAR-GPR data set. Firstly, using the SAR-GPR CMP data set, we will build the 3D velocity model including the ground surface topography and the subsurface velocity. Then, depending on the 3D model, we can do the ray tracing and compute the travel time between transmitter, receiver and each subsurface scattering point. At last, using the travel time, we can build the Huygens surface (or diffraction travel time surface) for each scattering point. The Huygens surface is the best migration trajectory. Depending on the Huygens surface and the migration trajectory of the SAR processing, we can discuss the migration aperture for SAR processing in rough ground area.

Original languageEnglish
Title of host publicationDetection and Remediation Technologies for Mines and Minelike Targets XI
DOIs
Publication statusPublished - 2006 Aug 23
EventDetection and Remediation Technologies for Mines and Minelike Targets XI - Kissimmee, FL, United States
Duration: 2006 Apr 172006 Apr 21

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6217 II
ISSN (Print)0277-786X

Other

OtherDetection and Remediation Technologies for Mines and Minelike Targets XI
CountryUnited States
CityKissimmee, FL
Period06/4/1706/4/21

Keywords

  • Landmine detection
  • Migration aperture
  • Migration trajectory
  • Ray tracing
  • SAR GPR
  • Travel time

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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