Synthetic aperture radar processing with tiered subapertures

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Description

Synthetic Aperture Radar (SAR) is used to form images that are maps of radar reflectivity of some scene of interest, from range soundings taken over some spatial aperture. Additionally, the range soundings are typically synthesized from a sampled frequency aperture. Efficient processing of the collected data necessitates using efficient digital signal processing techniques such as vector multiplies and fast implementations of the Discrete Fourier Transform. Inherent in image formation algorithms that use these is a trade-off between the size of the scene that can be acceptably imaged, and the resolution with which the image can be made. These limits arise ... continued below

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72 p.

Creation Information

Doerry, A. W. June 1, 1994.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

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  • Doerry, A. W. Sandia National Labs., Albuquerque, NM (United States). Synthetic Aperture Radar Dept.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Synthetic Aperture Radar (SAR) is used to form images that are maps of radar reflectivity of some scene of interest, from range soundings taken over some spatial aperture. Additionally, the range soundings are typically synthesized from a sampled frequency aperture. Efficient processing of the collected data necessitates using efficient digital signal processing techniques such as vector multiplies and fast implementations of the Discrete Fourier Transform. Inherent in image formation algorithms that use these is a trade-off between the size of the scene that can be acceptably imaged, and the resolution with which the image can be made. These limits arise from migration errors and spatially variant phase errors, and different algorithms mitigate these to varying degrees. Two fairly successful algorithms for airborne SARs are Polar Format processing, and Overlapped Subaperture (OSA) processing. This report introduces and summarizes the analysis of generalized Tiered Subaperture (TSA) techniques that are a superset of both Polar Format processing and OSA processing. It is shown how tiers of subapertures in both azimuth and range can effectively mitigate both migration errors and spatially variant phase errors to allow virtually arbitrary scene sizes, even in a dynamic motion environment.

Physical Description

72 p.

Notes

OSTI as DE94014211; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

Source

  • Other Information: PBD: Jun 1994

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  • Other: DE94014211
  • Report No.: SAND--94-1390
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/10161315 | External Link
  • Office of Scientific & Technical Information Report Number: 10161315
  • Archival Resource Key: ark:/67531/metadc1386577

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Creation Date

  • June 1, 1994

Added to The UNT Digital Library

  • Nov. 28, 2018, 2:33 p.m.

Description Last Updated

  • Dec. 10, 2018, 11:07 p.m.

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Doerry, A. W. Synthetic aperture radar processing with tiered subapertures, report, June 1, 1994; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1386577/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.