21 April 2010 An analysis of 3D SAR from single pass nonlinear radar platform trajectories
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Abstract
An analysis of 3-D SAR image formation under the challenging condition of single pass sampling in the elevation dimension is presented. The analysis is operationally relevant as it is often not possible for a radar platform to collect radar data at sufficient grazing angles to satisfy the Nyquist sampling criterion. It is found that these sampling issues can partly be overcome through the use of non-linear radar platform trajectories. In conventional 2-D SAR imaging this approach can be viewed as detrimental, as the image depth of focus is reduced, however for 3-D imaging a reduced depth of focus has been found to be advantageous. The approach however, comes at the cost of resultant unusual image point spread functions, with coarser resolution in the vertical dimension. It is possible to obtain a wide range of point spread functions as a function of collection parameters including range, the form of the non-linear radar platform trajectories and centre frequency. This work explores this parameter space to find advantageous radar collection geometries. The image point spread functions are difficult to characterise analytically and so a numerical approach is undertaken.
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Daniel André, "An analysis of 3D SAR from single pass nonlinear radar platform trajectories", Proc. SPIE 7699, Algorithms for Synthetic Aperture Radar Imagery XVII, 769908 (21 April 2010); doi: 10.1117/12.850093; https://doi.org/10.1117/12.850093
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