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Type: Conference paper
Title: Space variant filtering of polar format spotlight SAR images for wavefront curvature correction and interferometric processing
Author: Preiss, M.
Gray, D.
Stacy, N.
Citation: IGARSS 2002 : remote sensing, integrating our view of the planet : 2002 IEEE International Geoscience and Remote Sensing Symposium : 24th Canadian Symposium on Remote Sensing : proceedings : Westin Harbour Castle, Toronto, Canada, June 24-28 / vol.1, pp.179-181
Publisher: IEEE - Institute of Electrical and Electronics Engineers
Issue Date: 2002
ISBN: 078037536X
Conference Name: IGARSS 2002: IEEE International Geoscience and Remote Sensing Symposium (24th : 2002 : Toronto, Ontario)
Statement of
Preiss, M.; Gray, D.; Stacy, N.
Abstract: In repeat pass SAR interferometry the scene coherence can be used to detect subtle scene changes that occur in the interval between image collections. In spotlight SAR mode the azimuth resolution of the baseline and repeat pass imagery may be improved by collecting an extended aperture therefore allowing finer resolution estimates of the scene coherence. The formation of the imagery however requires adequate compensation of the wavefront curvature effects which become increasing significant in finer resolution imagery. In N. E. Doren (1997) it is shown that for spotlight SAR imagery, formed using the Polar Format Algorithm (PFA), wavefront curvature effects give rise to residual phase errors that may be removed using an image domain filtering technique. The analysis however is based on the formation of a slant plane image obtained by projection of the scene reflectivity along circular arcs centered on the flight track. In this paper a full 3D imaging geometry is considered to derive an appropriate post PFA image domain filter to form a ground plane image. This allows multipass images to be formed in a common image plane for subsequent interferometric processing. The technique is used to generate a fine resolution coherence map using data collected in a repeat pass SAR experiment using the DSTO Ingara SAR.
Description: Copyright © 2002 IEEE
RMID: 0020073800
DOI: 10.1109/IGARSS.2002.1024980
Appears in Collections:Electrical and Electronic Engineering publications

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