A new spatially variant SAR basebanding technique

Conference: EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar
06/04/2018 - 06/07/2018 at Aachen, Germany

Proceedings: EUSAR 2018

Pages: 4Language: englishTyp: PDF

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Andre, Daniel (Centre for Electronic Warfare Information and Cyber, Cranfield University, Shrivenham, UK)
Morrow, Ivor L. (Laboratory of Electromagnetic Systems Engineering, Cranfield University, Shrivenham, UK)

To obtain coherence products between pairs of Synthetic Aperture Radar (SAR) images, these need to undergo coregistration involving subpixel interpolation of one onto the other. SAR image phase deramping, or basebanding, should first be performed to avoid interpolation errors in the interpolation. Basebanding leads to more accurate image interpolation, however conventional basebanding is not optimal for SAR-near-field geometries where wavefronts are substantially curved over the imaging space. This is a scenario common in Ground-based SAR and in close-in UAV radar collection. This paper presents a spatially variant basebanding approach suitable for the SAR-near-field scenario.