Publications of Roy E. Hansen

Articles in journal or book chapters

1. A. E. A. Blomberg, T. O. Saebo, Roy E. Hansen, R. B. Pedersen, and A. Austeng. Automatic Detection of Marine Gas Seeps Using an Interferometric Sidescan Sonar. IEEE Journal of Oceanic Engineering, 42(3):590-602, July 2017. Keyword(s): Synthetic Aperture Sonar, SAS, carbon capture and storage, interferometry, oceanographic techniques, seafloor phenomena, sediments, sonar, underwater sound, volcanology, North Sea, acoustic backscatter properties, acoustic seep detection, automatic seep detection method, autonomous underwater vehicle, biogenic methane, gravel, interferometric sidescan sonar, man-made constructions, marine gas seep automatic detection, marine gas seep detection method, marine gas seep monitoring method, multibeam surveying, ocean greenhouse gases, pipelines, sandy seafloor, seafloor seeps, seafloor types, sediments, seep acoustical property, seep spatial property, sidescan surveying, signal processing techniques, silt, subseafloor CO2 storage sites, volcano CO2 release, water gas-filled bubbles, well heads, Acoustics, Backscatter, Damping, Monitoring, Resonant frequency, Sonar detection, Automatic leakage detection, carbon capture and storage (CCS) monitoring, coherence, gas seep detection, interferometric sonar, sidescan sonar. [Abstract] [bibtex-entry]



2. J. I. Buskenes, Roy E. Hansen, and A. Austeng. Low-Complexity Adaptive Sonar Imaging. IEEE Journal of Oceanic Engineering, 42(1):87-96, January 2017. Keyword(s): Synthetic Aperture Sonar, SAS, Sonar, array signal processing, interference suppression, sonar imaging, DAS beamformer, Hamming window function, Kaiser window, Kongsberg Maritime HISAS1030 sonar, LCA beamformer, delay-and-sum beamformer, gain -3 dB, interference minimization, low-complexity adaptive sonar imaging, minimum variance distortionless response, parallel hardware, rectangular window function, robust MVDR implementation, spatial statistics, Array signal processing, Arrays, Covariance matrices, Image resolution, Imaging, Robustness, Sonar, Active, LCA, MVDR, active filters, adaptive beamforming, adaptive filters, beamforming, complexity, computational complexity, phased arrays, sonar, spatial filters. [Abstract] [bibtex-entry]



3. S. A. V. Synnes, A. J. Hunter, Roy E. Hansen, T. O. Saebo, H. J. Callow, R. van Vossen, and A. Austeng. Wideband Synthetic Aperture Sonar Backprojection With Maximization of Wave Number Domain Support. IEEE Journal of Oceanic Engineering, 42(4):880-891, October 2017. Keyword(s): Synthetic Aperture Sonar, SAS, image filtering, image resolution, optimisation, sensor arrays, sonar imaging, synthetic aperture sonar, time-domain analysis, BP, SAS arrays, SAS image formation algorithms, TDBP access data, WD filtering, aspect-dependent scattering, data degradation, frequency-dependent scattering, generic SAS design, sensor data quality, spatial domain quality metrics, time domain backprojection access data, wave number domain counterpart, wave number domain support maximization, wideband SAS systems, wideband synthetic aperture sonar backprojection, widebeam synthetic aperture sonar backprojection, Image resolution, Imaging, Performance evaluation, Scattering, Sonar applications, Synthetic aperture sonar, Wideband, Along-track ambiguity, backprojection (BP) algorithm, grating lobes, synthetic aperture sonar (SAS), wideband sonar. [Abstract] [bibtex-entry]



4. Roy E. Hansen, A. P. Lyons, T. O. Saebo, H. J. Callow, and D. A. Cook. The Effect of Internal Wave-Related Features on Synthetic Aperture Sonar. IEEE Journal of Oceanic Engineering, 40(3):621-631, July 2015. Keyword(s): Synthetic Aperture Sonar, SAS, autonomous underwater vehicles, bathymetry, oceanographic techniques, sonar imaging, synthetic aperture sonar, (AUV), CMRE, Centre for Maritime Research and Experimentation, Elba Island Italy, FFI, HUGIN autonomous underwater vehicle, Kjeller Norway, La Spezia Italy, NATO research vessel, Norwegian Defence Research Establishment, RV, SAS bathymetry, SAS imaging, acoustical ray model, bolus, interferometric synthetic aperture sonar, internal wave-related feature effect, moving target analysis, multiaperture processing, multilook processing, repeat pass imaging, seabed topography, sound-speed structure, water column, Geometry, Imaging, Interferometry, Shape, Surfaces, Synthetic aperture sonar, Internal waves, refraction effects, synthetic aperture sonar. [Abstract] [bibtex-entry]



5. K. Landmark, A. H. Schistad Solberg, F. Albregtsen, A. Austeng, and Roy E. Hansen. A Radon-Transform-Based Image Noise Filter With Applications to Multibeam Bathymetry. IEEE Transactions on Geoscience and Remote Sensing, 53(11):6252-6273, November 2015. Keyword(s): Synthetic Aperture Sonar, SAS, Radon transforms, bathymetry, geophysical image processing, image denoising, image restoration, radar imaging, remote sensing by radar, synthetic aperture radar, Chebyshev approximation, Laplacian point spread function, denoised image, fast discrete Radon transform, geomorphological type statistical classification, image transform, invariant terrain features, invertible edge detection operator, linear-image-transform-based algorithm, motion-induced errors, motion-induced noise, multibeam bathymetry, original image, processed test images, radon-transform-based image noise filter, remote sensing data, second noise signature, standard low-pass filters, synthetic aperture radar images, track line artifacts, Approximation algorithms, Image edge detection, Noise, Noise reduction, Presses, Radio frequency, Transforms, Discrete transforms, image denoising, image restoration, iterative methods, remote sensing, sonar, terrain mapping. [Abstract] [bibtex-entry]



6. K. Landmark, A. H. Schistad Solberg, A. Austeng, and Roy E. Hansen. Bayesian Seabed Classification Using Angle-Dependent Backscatter Data From Multibeam Echo Sounders. IEEE Journal of Oceanic Engineering, 39(4):724-739, October 2014. Keyword(s): Synthetic Aperture Sonar, SAS, Bayes methods, Gaussian processes, acoustic wave scattering, approximation theory, backscatter, oceanographic techniques, pattern classification, piecewise constant techniques, sonar, statistical analysis, Bayesian seabed classification, Gaussian statistical model, North Sea data set, acoustical seabed classification, across-track spatial resolution, angle-dependent backscatter data, intrinsic scattering strength statistics, mapping seabed sediment, multibeam echo sounder, multibeam sonar data processing, piecewise constant function, piecewise function approximation, seabed scattering strength, spatial averaging, standard Bayesian theory, Bayes methods, Classification algorithms, Remote sensing, Sea floor, Sediments, Sonar, Underwater acoustics, Bayesian methods, classification algorithms, remote sensing, seafloor, sediments, sonar. [Abstract] [bibtex-entry]



7. A. E. Albright Blomberg, A. Austeng, Roy E. Hansen, and S. A. V. Synnes. Improving Sonar Performance in Shallow Water Using Adaptive Beamforming. IEEE Journal of Oceanic Engineering, 38(2):297-307, April 2013. Keyword(s): Synthetic Aperture Sonar, SAS, adaptive signal processing, array signal processing, interference suppression, optimisation, sonar imaging, Hanning window, LCA beamformer, MVDR beamformer, SNR, adaptive beamforming, adaptive minimum variance distortionless response beamformer, bottom-imaging sonars, dense receiver array, four-element receivers, low complexity adaptive beamformer, low sidelobe levels, multipath interference avoidance, multipath propagation, narrow mainlobe width, optimization criteria, second-order multipaths, shallow-water environments, sidelobe suppression, signal-to-noise ratio, sonar performance, spatial smoothing, vertical array, Array signal processing, Arrays, Receivers, Scattering, Sea surface, Signal to noise ratio, Sonar, Adaptive beamforming, multipath reduction, shallow-water imaging, sonar. [Abstract] [bibtex-entry]



8. A. E. A. Blomberg, C. I. C. Nilsen, A. Austeng, and Roy E. Hansen. Adaptive Sonar Imaging Using Aperture Coherence. IEEE Journal of Oceanic Engineering, 38(1):98-108, January 2013. Keyword(s): Synthetic Aperture Sonar, SAS, array signal processing, sonar imaging, speckle, DAS beamformer, HISAS 1030 sonar, SNR scenarios, SWiP, Wiener postfilter, adaptive sonar imaging, aperture-coherence-based methods, backscattered energy, coherence factor, computationally efficient adaptive imaging methods, delay-and-sum beamformer, image resolution, medical ultrasound imaging, noise suppression capabilities, receiver array, signal-to-noise ratio, speckle environment, Apertures, Arrays, Coherence, Imaging, Noise, Sonar, Speckle, Adaptive beamforming, Wiener postfilter, aperture coherence, array signal gain, coherence factor (CF), sonar imaging. [Abstract] [bibtex-entry]



9. F. Prieur and Roy E. Hansen. Theoretical Improvements When Using the Second Harmonic Signal in Acoustic Doppler Current Profilers. IEEE Journal of Oceanic Engineering, 38(2):275-284, April 2013. Keyword(s): Synthetic Aperture Sonar, SAS, Doppler shift, acoustic pulses, acoustic signal processing, acoustic wave velocity, autonomous underwater vehicles, harmonic generation, signal generators, underwater sound, Doppler frequency shift, Doppler log transmission, acoustic Doppler current profilers, floating particles, frequency 153.6 kHz, geometrical properties, geometry, harmonic signal generation, mainlobe-to-sidelobe ratio, perturbations, power 250 W, pulse transmission, sea bottom, second harmonic signal, size 400 m, velocity estimation error, velocity logs, vessel relative, water currents, Acoustic beams, Doppler shift, Estimation, Harmonic analysis, Transducers, Vectors, Current profiler, Doppler, harmonic, nonlinearity. [Abstract] [bibtex-entry]



10. T. O. Saebo, S. A. V. Synnes, and Roy E. Hansen. Wideband Interferometry in Synthetic Aperture Sonar. IEEE Transactions on Geoscience and Remote Sensing, 51(8):4450-4459, August 2013. Keyword(s): Synthetic Aperture Sonar, SAS, autonomous aerial vehicles, geophysical image processing, image resolution, oceanographic equipment, oceanographic techniques, radar imaging, radar interferometry, remote sensing by radar, synthetic aperture radar, Goldstein branch cut phase unwrapping algorithm, HISAS wideband interferometric SAS, HUGIN autonomous underwater vehicle, SAS interferometry, absolute phase difference, advanced phase unwrapping techniques, complex cross correlation technique, direct phase difference estimation, final phase estimate, high resolution images, interferometric data processing, misregistrated areas, multiband split spectrum technique, multichromatic approach, narrowband interferometry processing, phase ambiguities, seafloor, synthetic aperture sonar interferometry, topographic maps, wideband interferometry techniques, Delay effects, Interferometry, Maximum likelihood estimation, Synthetic aperture sonar, Wideband, Complex cross correlation, multichromatic analysis, split spectrum algorithm, synthetic aperture radar (SAR), synthetic aperture sonar (SAS), wideband interferometry. [Abstract] [bibtex-entry]



11. A. E. A. Blomberg, A. Austeng, and Roy E. Hansen. Adaptive Beamforming Applied to a Cylindrical Sonar Array Using an Interpolated Array Transformation. IEEE Journal of Oceanic Engineering, 37(1):25-34, January 2012. Keyword(s): Synthetic Aperture Sonar, SAS, array signal processing, interpolation, sonar arrays, sonar signal processing, SX90 fish finding sonar, adaptive beamforming, adaptive minimum variance, amplitude estimation, azimuth resolution, cylindrical sonar array, interference rejection, interpolated array transformation, phase estimation, virtual linear array, Array signal processing, Arrays, Covariance matrix, Signal resolution, Sonar applications, Vectors, Adaptive signal processing, array signal processing, beam steering, imaging, sonar, spatial resolution. [Abstract] [bibtex-entry]



12. Roy E. Hansen, H. J. Callow, T. O. Sabo, and S. A. V. Synnes. Challenges in Seafloor Imaging and Mapping With Synthetic Aperture Sonar. IEEE Transactions on Geoscience and Remote Sensing, 49(10):3677-3687, October 2011. Keyword(s): Synthetic Aperture Sonar, SAS, bathymetry, oceanographic equipment, radar imaging, radar interferometry, seafloor phenomena, synthetic aperture sonar, underwater sound, HISAS 1030 interferometric SAS, acoustic signals, aided inertial navigation, bathymetry, centimeter resolution, coherence, grating lobes, image focusing, nonstraight tracks, ocean environment, real aperture interferometry, sea surface, seafloor imaging, seafloor mapping, shallow waters, sonar positioning, sound velocity, synthetic aperture sonar, vehicle instability, Apertures, Image resolution, Imaging, Sonar navigation, Synthetic aperture sonar, Vehicles, Interferometry, multiple reflections, navigation, nonlinear tracks, seafloor imaging, sound velocity errors, synthetic aperture radar (SAR), synthetic aperture sonar (SAS), topography errors. [Abstract] [bibtex-entry]



13. J. Groen, Roy E. Hansen, H. J. Callow, J. C. Sabel, and T. O. Sabo. Shadow Enhancement in Synthetic Aperture Sonar Using Fixed Focusing. IEEE Journal of Oceanic Engineering, 34(3):269-284, July 2009. Keyword(s): Synthetic Aperture Sonar, SAS, image enhancement, sonar imaging, sonar target recognition, synthetic aperture sonar, HUGIN autonomous underwater vehicle, fixed focus shadow enhancement, shadow clarity, synthetic aperture sonar imaging, target recognition, widebeam synthetic aperture imaging systems, Acoustics, beamforming, focusing, imaging, shadow, synthetic aperture sonar (SAS). [Abstract] [bibtex-entry]



14. T. O. Saebo, Roy E. Hansen, and A. Hanssen. Relative Height Estimation by Cross-Correlating Ground-Range Synthetic Aperture Sonar Images. IEEE Journal of Oceanic Engineering, 32(4):971-982, October 2007. Keyword(s): Synthetic Aperture Sonar, SAS, oceanographic techniques, seafloor phenomena, sonar imaging, synthetic aperture sonar, Elba Island, InSAS-2000 experiment, Italy, SAS processing, along-track resolution, azimuth resolution, broadband signals, coherent frequency-dependent scattering, correction technique, cross correlations, geometrical decorrelation effect, image acquisition, mathematical model, moving platform, seafloor relative height, signal-to-noise ratio, sonar images beamforming, synthetic aperture sonar imaging, time-delay estimates, vertically displaced receivers, Azimuth, Coherence, Decorrelation, Frequency estimation, Mathematical model, Scattering, Sea floor, Signal resolution, Signal to noise ratio, Synthetic aperture sonar, Bathymetry, coherence, cross correlation, height estimation, interferometry, synthetic aperture sonar (SAS), time-delay estimation. [Abstract] [bibtex-entry]



15. T. Sparr, Roy E. Hansen, H. J. Callow, and J. Groen. Enhancing target shadows in SAR images. Electronics Letters, 43(5):69-70, March 2007. Keyword(s): SAR Processing, image enhancement, radar imaging, synthetic aperture radar, SAR images, fixed focus shadow enhancement, radar image, sharp target image, synthetic aperture radar, target shadow enhancement. [Abstract] [bibtex-entry]

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