Refocus of constant velocity moving targets in synthetic aperture radar imagery

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The detection and refocus of moving targets in SAR imagery is of interest in a number of applications. In this paper the authors address the problem of refocusing a blurred signature that has by some means been identified as a moving target. They assume that the target vehicle velocity is constant, i.e., the motion is in a straight line with constant speed. The refocus is accomplished by application of a two-dimensional phase function to the phase history data obtained via Fourier transformation of an image chip that contains the blurred moving target data. By considering separately the phase effects of ... continued below

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13 p.

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Jakowatz, C. V., Jr.; Wahl, D. E. & Eichel, P. H. April 1998.

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This article 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. It has been viewed 21 times . More information about this article can be viewed below.

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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

The detection and refocus of moving targets in SAR imagery is of interest in a number of applications. In this paper the authors address the problem of refocusing a blurred signature that has by some means been identified as a moving target. They assume that the target vehicle velocity is constant, i.e., the motion is in a straight line with constant speed. The refocus is accomplished by application of a two-dimensional phase function to the phase history data obtained via Fourier transformation of an image chip that contains the blurred moving target data. By considering separately the phase effects of the range and cross-range components of the target velocity vector, they show how the appropriate phase correction term can be derived as a two-parameter function. They then show a procedure for estimating the two parameters, so that the blurred signature can be automatically refocused. The algorithm utilizes optimization of an image domain contrast metric. They present results of refocusing moving targets in real SAR imagery by this method.

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13 p.

Notes

OSTI as DE98004469

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  • 12. annual international symposium on aerospace/defense sensing, simulation and controls, Orlando, FL (United States), 13-19 Apr 1998

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  • Other: DE98004469
  • Report No.: SAND--98-0736C
  • Report No.: CONF-980412--
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 671873
  • Archival Resource Key: ark:/67531/metadc703715

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  • April 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 13, 2016, 6:47 p.m.

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Jakowatz, C. V., Jr.; Wahl, D. E. & Eichel, P. H. Refocus of constant velocity moving targets in synthetic aperture radar imagery, article, April 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc703715/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.