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Proceedings Paper

Accurate geometrical model for airborne synthetic aperture radar
Author(s): Hubert M. J. Cantalloube; Carole E. Nahum
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Paper Abstract

The accurate knowledge of the geometry of an airborne SAR image is crucial for many applications. Repeat-pass SAR interferometry requires an accurate image matching to the 10th of a pixel, while less demanding applications such as wide area coverage by multi-pass composite or image geocoding tolerate mismatches of pixels. Compared to spaceborne SAR, those accuracy requirements are stronger for airborne SAR sine they provide higher resolution. Moreover, irregularities in aircraft motion due to air turbulence introduce severe geometrical distortions in the images. Unfortunately, these distortions are tightly coupled with the signal processing algorithm used for computing SAR images. We have implemented a geometrical error model for our generic off-line SAR processor which provides an image distortion map. Derivatives with respect to errors in radar parameters and errors in aircraft trajectory measurements (velocity, altitude, oscillations are also provided, thus allowing the efficient estimation of the errors from distortion measurements (tiepoints). The paper is illustrated with some relevant application examples.

Paper Details

Date Published: 10 December 1999
PDF: 12 pages
Proc. SPIE 3869, SAR Image Analysis, Modeling, and Techniques II, (10 December 1999); doi: 10.1117/12.373157
Show Author Affiliations
Hubert M. J. Cantalloube, ONERA (France)
Carole E. Nahum, ONERA (France)


Published in SPIE Proceedings Vol. 3869:
SAR Image Analysis, Modeling, and Techniques II
Francesco Posa, Editor(s)

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