Wideband Synthetic Aperture Sonar Back Projection with Maximization of Wave Number Domain Support

Author
Synnes, Stig Asle Vaksvik
Hunter, Alan Joseph
Hansen, Roy Edgar
Sæbø, Torstein Olsmo
Callow, Hayden John
Van Vossen, Robbert
Austeng, Andreas
Date Issued
2017
Keywords
Syntetisk apertur sonar
Sensorer
Bildekvalitet
Permalink
http://hdl.handle.net/20.500.12242/870
https://publications.ffi.no/123456789/870
DOI
10.1109/JOE.2016.2614717
Collection
Articles
Description
Synnes, Stig Asle Vaksvik; Hunter, Alan Joseph; Hansen, Roy Edgar; Sæbø, Torstein Olsmo; Callow, Hayden John; Van Vossen, Robbert; Austeng, Andreas. Wideband synthetic aperture sonar backprojection with maximization of wave number domain support. IEEE Journal of Oceanic Engineering 2017 ;Volum 42.(4) s. 880-891
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Abstract
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 frequencies and aspect angles. We relate the typical spatial domain quality metrics to their wave number domain (WD) counterpart, and use these to map the data quality in WD. Because SAS arrays often are undersampled along-track, we pay particular attention to data degradation from aliasing. We use the proposed approach to examine how three SAS image formation algorithms based on time domain backprojection (TDBP) access data of different quality from wideband SAS systems. We illustrate the results with predictions for a generic SAS design and demonstrate the findings on two experimental systems. We observe that the maximum support of high-quality data is achieved through BP onto a high-resolution grid followed by WD filtering.
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