An analysis of 3D SAR from single pass nonlinear radar platform trajectories

Daniel André

doi:10.1117/12.850093

21 April 2010 An analysis of 3D SAR from single pass nonlinear radar platform trajectories

Daniel André

Proceedings Volume 7699, Algorithms for Synthetic Aperture Radar Imagery XVII; 769908 (2010) https://doi.org/10.1117/12.850093
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

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.

Citation Download Citation

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); https://doi.org/10.1117/12.850093

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