Array interpolation for improved SAR imaging

Alain C. Barthelemy; Peter K. Willett

doi:10.1117/12.326757

14 October 1998 Array interpolation for improved SAR imaging

Proceedings Volume 3462, Radar Processing, Technology, and Applications III; (1998) https://doi.org/10.1117/12.326757
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Synthetic Aperture Radar utilizes the motion of the platform on which it is mounted to realize a virtual array antenna. The illumination of a specific patch of ground and the sampling of the radar returns over time and space result in a non-uniform collection space. Motion compensation corrects for certain platform motions, but still may result in a polar collection space with non-uniformly spaced samples. To employ the fast Fourier transform to form an image from this phase history data, the polar raster data must be resampled onto a rectangular grid by means of polar reformatting. However, non- uniformity errors present in the polar grid will propagate to the rectangular grid, and result in SAR image defocusing. This paper describes a technique that may be used to interpolate the non-uniformly collected radar samples to a uniform polar space, thereby improving the efficacy of the polar-to- rectangular resampling process. This work presents new ideas for polar grid design by demonstrating that certain virtual grids are better for interpolation than others. A measure of the relative interpolation error is established. The step-by- step approach of polar grid interpolation is explained.

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Alain C. Barthelemy and Peter K. Willett "Array interpolation for improved SAR imaging", Proc. SPIE 3462, Radar Processing, Technology, and Applications III, (14 October 1998); https://doi.org/10.1117/12.326757

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KEYWORDS

Synthetic aperture radar

Antennas

Radar

Array processing

Solids

Algorithm development

Error analysis

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