21 October 2014 Ambiguities analysis in SAR tomography
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Abstract
Synthetic aperture radar tomography (TomoSAR) is typically used to retrieve elevation, deformation, and other key information by separating scatters of the same slant range in multiple baseline SAR images. In this paper, we investigate two kinds of ambiguities for TomoSAR. Rank-1 ambiguity, as the first one we concerned, is due to the baseline distribution of the SAR image dataset which makes the steering matrix out of full rank. It will result in false alarms appearing in a permanent distance. However, an example using the TomoSAR imaging parameters shows this ambiguity makes no sense in most cases. The second ambiguity refers to the coherence of scatters contained in one pixel. In simulation experiment, the coherence will enhance the side lobes of the spectrum, even make the real peaks fused.
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Ziwei Wang, Hong Zhang, Chao Wang, Yixian Tang, Bo Zhang, "Ambiguities analysis in SAR tomography", Proc. SPIE 9243, SAR Image Analysis, Modeling, and Techniques XIV, 924313 (21 October 2014); doi: 10.1117/12.2067140; https://doi.org/10.1117/12.2067140
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