A novel polar format algorithm for SAR images utilizing post azimuth transform interpolation.

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SAR phase history data represents a polar array in the Fourier space of a scene being imaged. Polar Format processing is about reformatting the collected SAR data to a Cartesian data location array for efficient processing and image formation. In a real-time system, this reformatting or ''re-gridding'' operation is the most processing intensive, consuming the majority of the processing time; it also is a source of error in the final image. Therefore, any effort to reduce processing time while not degrading image quality is valued. What is proposed in this document is a new way of implementing real-time polar-format processing ... continued below

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28 p.

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Holzrichter, Michael Warren; Martin, Grant D. & Doerry, Armin Walter September 1, 2005.

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Description

SAR phase history data represents a polar array in the Fourier space of a scene being imaged. Polar Format processing is about reformatting the collected SAR data to a Cartesian data location array for efficient processing and image formation. In a real-time system, this reformatting or ''re-gridding'' operation is the most processing intensive, consuming the majority of the processing time; it also is a source of error in the final image. Therefore, any effort to reduce processing time while not degrading image quality is valued. What is proposed in this document is a new way of implementing real-time polar-format processing through a variation on the traditional interpolation/2-D Fast Fourier Transform (FFT) algorithm. The proposed change is based upon the frequency scaling property of the Fourier Transform, which allows a post azimuth FFT interpolation. A post azimuth processing interpolation provides overall benefits to image quality and potentially more efficient implementation of the polar format image formation process.

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28 p.

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  • Report No.: SAND2005-5510
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/876306 | External Link
  • Office of Scientific & Technical Information Report Number: 876306
  • Archival Resource Key: ark:/67531/metadc873142

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  • September 1, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 30, 2016, 1:14 p.m.

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Holzrichter, Michael Warren; Martin, Grant D. & Doerry, Armin Walter. A novel polar format algorithm for SAR images utilizing post azimuth transform interpolation., report, September 1, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc873142/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.