MIMO-SAR Tomography

Krieger G, Rommel T, Moreira A (2016)

Publication Type: Conference contribution

Publication year: 2016

Publisher: VDE

Edited Volumes: Proceedings of the European Conference on Synthetic Aperture Radar, EUSAR

Pages Range: 91-96

Conference Proceedings Title: European Conference on Synthetic Aperture Radar (EUSAR)

URI: https://elib.dlr.de/104701/


MIMO SAR employs multiple transmit and receive channels to improve the imaging performance and to acquire novel geo-information products. One example is SAR tomography, where the simultaneous transmission and reception with multiple antennas can provide a large number of baselines with a small number of antennas. In the limit, an appropriately designed MIMO-SAR configuration with N_Tx transmitters and N_Rx receivers can provide in total N_Tx∙N_Rx independent phase centers and therefore N_Tx∙N_Rx-1 independent baselines for SAR tomography. The other extreme is provided by uniform linear arrays with co-located transmitters and receivers. Such configurations are characterized by a large number of overlapping effective phase centers and are therefore regarded as highly redundant. In this paper, we will show that such a redundancy is nevertheless well suited to resolve an inherent challenge of conventional SAR tomography, which is limited in providing unambiguous 3-D scatterer position estimates in case of multiple scattering. For this, we show that redundant MIMO arrays allow not only an a posteriori beamforming on receive, but, at the same time, also a comparable a posteriori (i.e. after data acquisition) beamforming on transmit. This means that one can emulate, from one and the same recorded MIMO-SAR data set, different illumination scenarios on transmit and receive. By evaluating the 2-D spectrum provided by the independent Tx and Rx beams, it becomes then possible to differentiate between single- and multiple-bounce scattering. The separation between single- and double-bounce scattering has also been successfully demonstrated in a ground-based radar experiment and is presented in another EUSAR paper.

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Krieger, G., Rommel, T., & Moreira, A. (2016). MIMO-SAR Tomography. In European Conference on Synthetic Aperture Radar (EUSAR) (pp. 91-96). VDE.


Krieger, Gerhard, Tobias Rommel, and Alberto Moreira. "MIMO-SAR Tomography." Proceedings of the 11th European Conference on Synthetic Aperture Radar, EUSAR 2016 VDE, 2016. 91-96.

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