Browsing by Author "Hansen, Roy Edgar"
Now showing items 21-30 of 30
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Point detection in textured ultrasound images
Thon, Stine Hverven; Austeng, Andreas; Hansen, Roy Edgar (2023-02-26)Detection of point scatterers in textured ultrasound images can be challenging. This paper investigates how four multilook methods can improve the detection. We analyze many images with known point scatterer locations and ... -
Quantifying the negative impact of breaking internal waves on interferometric synthetic aperture sonar
Hansen, Roy Edgar; Lyons, Anthony P.; Cook, Daniel A.; Sæbø, Torstein Olsmo (2018) -
A Radon-Transform-Based Image Noise Filter - With Applications to Multibeam Bathymetry
Landmark, Knut; Solberg, Anne H Schistad; Albregtsen, Fritz; Austeng, Andreas; Hansen, Roy Edgar (2015)This paper describes a linear-image-transform-based algorithm for reducing stripe noise, track line artifacts, and motion-induced errors in remote sensing data. Developed for multibeam bathymetry (MB), the method has also ... -
Sensotek interferometrisk syntetisk aperture sonar for Hugin AUV
Hansen, Roy Edgar (2001) -
The SENSOTEK Synthetic Aperture Sonar - results from HUGIN AUV trials
Hansen, Roy Edgar; Sæbø, Torstein Olsmo; Hayden, John Callow; Hagen, Per Espen (2007)FFI har et samarbeid med Kongsberg Maritime for utvikling av syntetisk aperture sonar (SAS) teknologi for HUGIN autonom undervannsfarkost (AUV). Som en del av dette samarbeidet er en bredbåndet, bredstrålet interferometrisk ... -
Spatial coherence of speckle for repeat-pass synthetic aperture sonar micronavigation
Synnes, Stig Asle Vaksvik; Hansen, Roy Edgar; Sæbø, Torstein Olsmo (2021-03-31)Accurate positioning of autonomous underwater vehicles is a major challenge. The long-term drift is problematic if global position updates are not available, and for applications such as repeat-pass interferometry and ... -
Synthetic aperture sonar signal processing : results from INSAS-2000
Hansen, Roy Edgar; Sæbø, Torstein Olsmo (2003)This report presents signal processing techniques particularly suited for interferometric Synthetic Aperture Sonar (SAS) systems on-board Autonomous Underwater Vehicles (AUV) (or other platforms carrying high grade ... -
The use of synthetic aperture sonar to survey seafloor massive sulfide deposits
Denny, Alden Ross; Sæbø, Torstein Olsmo; Hansen, Roy Edgar; Pedersen, Rolf B. (2015)With the advent of advanced deep sea mining technology, seafloor mining is poised to begin on a global scale. For the success of any mining operation, it is crucial that both the operators and regulatory bodies possess ... -
Wideband Interferometry in Synthetic Aperture Sonar
Sæbø, Torstein Olsmo; Synnes, Stig Asle Vaksvik; Hansen, Roy Edgar (2013)Synthetic aperture sonar (SAS) interferometry can provide very high resolution images and topographic maps of the seafloor over large swaths. Processing of interferometric data to retrieve reliable depth estimates of the ... -
Wideband Synthetic Aperture Sonar Back Projection with Maximization of Wave Number Domain Support
Synnes, Stig Asle Vaksvik; Hunter, Alan Joseph; Hansen, Roy Edgar; Sæbø, Torstein Olsmo; Callow, Hayden John; Van Vossen, Robbert; Austeng, Andreas (2017)Wideband and widebeam synthetic aperture sonar (SAS) can provide information on the frequency- and aspect-dependent scattering in a scene. We suggest an approach to predict the quality of the sensor data over the available ...