Approach to velocity and acceleration measurement in the Bi-Directional SAR imaging mode
Josef Mittermayer (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Pau Prats-Iraola (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Steffen Wollstadt (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Stefan V. Baumgartner (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Paco López-Dekker (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Antoni Broquetas (Universitat Politecnica de Catalunya)
Eduardo Makhoul Varona (Universitat Politecnica de Catalunya)
Gerhard Krieger (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Alberto Moreira (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
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Abstract
This paper presents an initial analysis of the possibilities for velocity and acceleration measurement with the Bi-Directional SAR imaging mode (BiDi). It comprises single satellite single path acquisitions as well as a constellation of two satellites. The translational velocity components into azimuth and range directions are simulated. A BiDi approach for measuring the azimuth velocity from one satellite with one receiving channel is proposed. Image examples acquired with the TerraSAR-X (TSX) and TanDEM-X (TDX) satellites show velocity and acceleration effects on ships and the proposed BiDi velocity approach is verified. Interferometric fringes were observed on anchoring ships. A first approach into the understanding of rotational effects was achieved by simulation of rotational fringes.
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