Title :
Effect of Approximations in Fast Factorized Backprojection in Synthetic Aperture Imaging of Spot Regions
Author :
Callow, H.J. ; Hansen, R.E. ; Saebo, T.O.
Author_Institution :
Norwegian Defence Res. Establ., Kjeller
Abstract :
Fast Factorized Backprojection (FFBP) provides accelerated SAS image reconstruction at the cost of a tunable level of approximation. The approximation causes image artifacts and incorrect heights in interferometry. We explain the cause and effect of FFBP approximation and compare various levels of approximation on imagery and interferometry from data collected in the field with the SENSOTEK SAS. Interferometry has shown to be more sensitive to FFBP approximation error than imagery due to its phase sensitive nature. For bistatic FFBP implementations we recommend an FFBP approximation level Efact better than 1/10 of a wavelength as a reasonable tradeoff between computational load and error
Keywords :
image reconstruction; interferometry; sonar imaging; synthetic aperture sonar; Fast Factorized Backprojection; SAS image reconstruction; SENSOTEK SAS; bistatic FFBP implementation; image artifacts; imagery; interferometry; synthetic aperture imaging; synthetic aperture sonar; Focusing; Geometry; High-resolution imaging; Image reconstruction; Image resolution; Interferometry; Layout; Synthetic aperture radar; Synthetic aperture sonar; Time domain analysis;
Conference_Titel :
OCEANS 2006
Conference_Location :
Boston, MA
Print_ISBN :
1-4244-0114-3
Electronic_ISBN :
1-4244-0115-1
DOI :
10.1109/OCEANS.2006.307042
