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

fYear

2006

fDate

18-21 Sept. 2006

Firstpage

1

Lastpage

6

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 E_fact 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;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS 2006

Conference_Location

Boston, MA

Print_ISBN

1-4244-0114-3

Electronic_ISBN

1-4244-0115-1

Type

conf

DOI

10.1109/OCEANS.2006.307042

Filename

4099161