title: Fast nearfield to farfield conversion algorithm for circular synthetic aperture sonar.
abstract: Monostatic circular synthetic aperture sonar (CSAS) images are formed by processing azimuthal angle dependent backscattering from a target at a fixed distance from a collocated source/receiver. Typical CSAS imaging algorithms [Ferguson and Wyber, J. Acoust. Soc. Am. 117, 2915-2928 (2005)] assume scattering data are taken in the farfield. Experimental constraints may make farfield measurements impractical and thus require objects to be scanned in the nearfield. Left uncorrected this results in distortions of the target image and in the angular dependence of features. A fast approximate Hankel function based algorithm is presented to convert nearfield data to the farfield. Images and spectrograms of an extended target are compared for both cases.
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814 daniel.plotnick@wsu.edu, marston@wsu.edu.
authors.forename: Daniel S
authors.initials: DS
authors.lastname: Plotnick
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814 daniel.plotnick@wsu.edu, marston@wsu.edu.
authors.forename: Philip L
authors.initials: PL
authors.lastname: Marston
authors.affiliation: Applied Physics Laboratory, University of Washington, 1013 Northeast 40th Street, Seattle, Washington 98105-6698 marston@apl.washington.edu.
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Marston