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Dr. Ir MSc. Olga LOPERA

Researcher

olga.loperatellez@rma.ac.be     +32-2-44-14199     Academic details

Research projects

MRN09

This project addresses the limitations for observation, detection and classification of seabed ground targets, in particular mines. It will target the aspect of high-resolution synthetic-aperture sonar image by investigating the use of interferometric SAS methods (in particular single- and dual-pass interferometry), in order to facilitate the classification task. In the same philosophy as dual-pass interferometry, a new concept of imaging technique based on planar synthetic aperture sonar (P-SAS) will be investigated, which takes advantage of the overlap of both ping-to-ping and track-to-track footprints to improve the imaging resolution in both along-track and across-track directions.

A second aspect of the study will be the classification by itself; herein the speckle reduction task will be considered as well as the classification based on the three categories mentioned earlier; shadow based characterization, echoes based characterization and fusion based methods.

Publications

  1. Olga Lopera and Sonia Papili. An introductory study of the impact of environmental parameters in the performances of imaging sonar systems. In OCEANS MTS/IEEE Monterey, pages 1-4, Monterey, 2016. IEEE.
  2. Sonia Papili and Olga Lopera. High frequency response on seafloor signature: structure for an innovative methodology for modern monitoring. In S. et al. Degraer, editor, North Sea Open Science Conference, page 78, Oostende, 2016. Royal Belgian Institute of Natural Sciences and Belgian Biodiversity Platform.
  3. Sonia Papili, C Jenkins, Marc Roche, Thomas Wever, Olga Lopera, and Vera Van Lancker. INFLUENCE OF SHELLS AND SHELL DEBRIS ON BACKSCATTER STRENGTH: INVESTIGATION USING MODELING, SONAR MEASUREMENTS AND SAMPLING ON THE BELGIAN CONTINENTAL SHELF. In Blondel et al., editor, Seabed and Sediment Acoustics: Measurements and Modelling, pages 1-7, Bath, 2015. Institute of Acoustics.
  4. Marc Roche, Matthias Baeye, Jeroen De Bisschop, Koen Degrendele, Lis De Mol, Sonia Papili, Olga Lopera, and Vera Van Lancker. BACKSCATTER STABILITY AND INFLUENCE OF WATER COLUMN CONDITIONS: ESTIMATION BY MULTIBEAM ECHOSOUNDER AND REPEATED OCEANOGRAPHIC MEASUREMENTS, BELGIAN PART OF THE NORTH SEA. In Blondel et al., editor, Seabed and Sediment Acoustics: Measurements and Modelling, pages 74-84, Bath, 2015. Institute of Acoustics.
  5. Olga Lopera and Wei Liu. An Introductory Study for Applying Single-pass Interferometry to Hull Mounted Sonar Data for Target Height Estimation.. In EUSAR 2014, page 4, Berlin, Germany, 2014.
  6. Olga Lopera and Yves Dupont. Interferometric-SAS applied to SHADOWS - A case study. In Oceans 2013, page 4, Bergen, Norway, 2013.
  7. Olga Lopera and Yves Dupont. Automated Target Recognition in Synthetic Aperture Sonar: shadow and highlight-based classification. . In Oceans 2012, page 4, Hampton Roads, VA, 2012.
  8. Olga Lopera. ANALYSIS OF SEGMENTATION TECHNIQUES TO FACILITATE DETECTION AND IDENTIFICATION OF SEAFLOOR TARGETS. In Underwater Acoustic Measurements 2011, pages 1-4, Kos, Greece, 2011.
  9. Olga Lopera. Combining despeckling and segmentation techniques to facilitate detection and identification of seafloor targets. In Oceans 2011, pages 1-4, Santander, Spain, 2011.
  10. Francesco Soldovieri, Olga Lopera, and Sébastien Lambot. Combination of Advanced Inversion Techniques for an Accurate Target Localization via GPR for Demining Applications. IEEE Trans. on Geoscience and Remote Sensing, 49(1):451-461, 2011.
  11. Olga Lopera. Analysis and comparison of different SAR image speckle reduction techniques applied to SAS. In International Conference on Synthetic Aperture Sonar and Synthetic Aperture Radar, Lerici, Italy, 2010.
  12. Olga Lopera. Filtering speckle noise in SAS images to improve detection and identification of seafloor targets. In Waterside Security Conference (WSS), 2010 International, pages 1-4, Carrara, Italy, 2010.
  13. S Lambot, E Slob, J Rhebergen, O Lopera, K Jadoon, and H Vereecken. Remote estimation of the hydraulic properties of a sand using full-waveform integrated hydrogeophysical inversion of time-lapse, off-ground GPR data. Vadoze Zone Journal, 8(3):743-754, 2009.
  14. L Capineri, D. Daniels, P Falorni, O Lopera, and C G Windsor. Estimation of Relative Permittivity of Shallow Soils by Using the Ground Penetrating Radar Response from Different Buried Targets.. Progress in Electromagnetics Research Letters, 2:63-71, 2008.
  15. O Lopera. An Integrated Detection and Identification Methodology Applied to Ground-Penetrating Radar Data for Humanitarian Demining Applications. PhD thesis, Université catholique de Louvain, Belgium - École royale militaire, Belgium - Universidad de Los Andes, Colombia, 2008.
  16. O Lopera, N Milisavljevic, B Macq, and S Lambot. A parameter-estimation-based change detection methodology for landmine localization from ground-penetrating radar data.. In IGARSS 2008, Boston, Massachusetts USA, 2008.
  17. O Lopera, J Rhebergen, E Slob, N Milisavljevic, and S Lambot. Analysis of the effect of watering on landmine detection. In 12th International Conference on Ground Penetrating Radar GPR 2008, Birmingham,UK, 2008.
  18. Olga Lopera, Nada Milisavljevi, David Daniels, Alain Gauthier, and Benoît Macq. A time frequency domain feature extraction algorithm for landmine identification from GPR data. Near Surface Geophysics, 6(6):411-421, December 2008.
  19. E Slob, S Lambot, J Rhebergen, O Lopera, and H Vereecken. Closed loop hydrogeophysical inversion of time-lapse GPR data to determine hydraulic properties of a sandy soil. In SEG 2008, Las Vegas, Nevada USA, 2008.
  20. Olga Lopera and Nada Milisavljevic. Prediction of the effects of soil and target properties on the antipersonnel landmine detection performance of ground-penetrating radar: A Colombian case study. Journal of Applied Geophysics, 63(1):13-23, September 2007.
  21. O Lopera, N Milisavljevic, and S Lambot. Clutter Reduction in GPR Measurements for Detecting Shallowly Buried Landmines: a Colombian Case Study. Near Surface Geophysics, 2007.
  22. O Lopera, N Milisavljevic, B Macq, and S Lambot. Time-frequency domain signature analysis of GPR data for landmine identification. In Proceedings of the 4th International Workshop on Ground Penetrating Radar, pages 159-162, 2007.
  23. O Lopera, N Milisavljevic, J Rhebergen, and S Lambot. Analysis of the effect of target and soil properties on the detection performance of ground penetrating radar: experimental and in field results. In Proceedings of IGARSS 2007, Barcelona, Spain, 2007.
  24. Olga Lopera, Sébastien Lambot, and Nada Milisavljevic. Clutter reduction in GPR measurements for detecting shallow buried landmines : a Colombian case study. Near Surface Geophysics, 5:57-64, 2007.
  25. Olga Lopera, Evert Slob, Nada Milisavljevic, and Sébastien Lambot. Filtering soil surface and antenna effects from GPR data to enhance landmine detection. IEEE Trans. on Geoscience and Remote Sensingand Remote Sensing,, 45(3):707-717, 2007.
  26. S Lambot, O Lopera, and E C Slob. Effect of the Antenna Height on the Estimation of the Soil Electromagnetic Properties using Full-Wave Inverse Modeling of GPR Data. In XI International Conference on Ground Penetrating Radar GPR 2006, Columbus, Ohio USA, 2006.
  27. O Lopera, S Lambot, E Slob, M Vancoolster, B Macq, and N Milisavljevic. A new integrated approach for characterizing the soil electromagnetic properties and detecting landmines using a hand-held vector network analyzer. In Defense and Security Symposium 2006, Orlando, Florida USA, 2006.
  28. O Lopera, N Milisavljevic, B Macq, and S Lambot. Change Detection Based on Parameter Estimation From Frequency-domain GPR Data for Demining Applications. In XI International Conference on Ground Penetrating Radar GPR 2006, Columbus, Ohio USA, 2006.
  29. O Lopera, S Lambot, N Milisavljevic, B Scheers, and I van den Bosch. Background Subtraction in the Frequency Domain for Focusing Ground-Penetrating Radar Data. In Proceedings of the Third International Workshop on Advanced GPR, Delft, The Netherlands, 2005.
  30. O. Lopera, S. Lambot, N. Milisavljevic, B. Scheers, and I. van den Bosch. Background subtraction in the frequency domain for focusing ground-penetrating radar data. In Proceedings of the 3rd International Workshop on Advanced Ground Penetrating Radar, pages 25-30. IEEE, 2005.
  31. O Lopera, B Macq, N Milisavljevic, and B Scheers. Denoising and migration techniques for landmine identification from Ground-Penetrating Radar 2D data. In eProceedings of GRETSI 2005, Louvain-la-neuve, Belgium, 2005.
  32. O Lopera. Analysis and processing of two-dimensional data from ground-penetrating radar for Humanitarian Demining applications. Master thesis, 2004.
  33. O Lopera, S Lambot, I van den Bosch, A Gauthier, N Milisavljevic, and B Macq. A new signal processing approach for landmine signature extraction from Ground Penetrating Radar 2D data. In eProceedings of the IV National Congress on Automatization and Control, ISBN 958-8028-39-6, Bogota, Colombia, 2004.
  34. O Lopera, N Milisavljevic, B Macq, I van den Bosch, S Lambot, and A Gauthier. Analysis of segmentation techniques for landmine signature extraction from Ground Penetrating Radar 2D data. In eProceedings of the II International IEEE Andean Region Conference, ISBN 958-33-6534-3, Bogota, Colombia, 2004.
  35. O Lopera, I van den Bosch, S Lambot, N Milisavljevic, and B Macq. Simulation and analysis of ladnmine signatures from Ground Penetrating Radar 2D data. In Proceedings of the International Symposium Humanitarian Demining 2004, Sibenik, Croatia, 2004.
  36. S. Lambot, I van den Bosch, O Lopera, and E C Slob. Inverse identification of the shallow subsurface electric properties from frequency domain GPR signal for supporting humanitarian demining. In eProceedings of the II International IEEE Andean Region Conference, ISBN 958-33-6534-3, Bogota, Colombia, 2004.
  37. O. Lopera, S. Lambot, N. Milisavljevic, B. Scheers, and I. van den Bosch. Background subtraction in the frequency domain for focusing ground-penetrating radar data. In Proceedings of the 3rd International Workshop on Advanced Ground Penetrating Radar, 2005. IWAGPR 2005., pages 25-30. IEEE.