Topography Correction for Distributed SAR Imaging: A Case Study for TerraSAR-X and TanDEM-X

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

Proceedings: EUSAR 2018

Pages: 5Language: englishTyp: PDF

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Kraus, Thomas; Bachmann, Markus; Krieger, Gerhard (Microwaves and Radar Institute, German Aerospace Center (DLR), Oberpfaffenhofen, Germany)

Multichannel synthetic aperture radar (SAR) image formation is a promising technique to mitigate the pulse repetition frequency (PRF) constraints inherent to single-channel SAR systems. The multichannel approach enables the acquisition of wide swathes while maintaining a high azimuth resolution. An important step during the multichannel processing for distributed SAR systems is the correction of the topographic phase. This phase is introduced by non-zero cross-track baselines between the antenna phase centers in a constellation or swarm of satellites. The paper in hand describes the processing approach which was exemplarily used for a multistatic experiment conducted with TerraSAR-X and TanDEM-X. Challenges with the correction of the topographic phase are highlighted and the impact of the cross-track baseline is discussed.