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Sökning: L773:9781509008636

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1.
  • Torgrimsson, Jan, 1982, et al. (författare)
  • Factorized Geometrical Autofocus: On the geometry search
  • 2016
  • Ingår i: IEEE Radar Conference (RadarConf), Philadelphia, PA, USA, May 02-06, 2016. - 1097-5764. - 9781509008636 ; , s. 293-297
  • Konferensbidrag (refereegranskat)abstract
    • This paper deals with local geometry optimization within the scope of Factorized Geometrical Autofocus (FGA). The FGA algorithm is a Fast Factorized Back-Projection (FFBP) formulation with six free geometry parameters. These are tuned until a sharp image is obtained, i.e. with respect to an object function. To optimize the geometry (from a focus perspective) for a small image area, we propose an efficient routine based on correlation, sensitivity analysis and Broyden-Fletcher-Goldfarb-Shanno (BFGS) minimization. The new routine is evaluated using simulated Ultra-WideBand (UWB) data. By applying the FGA algorithm step-by-step, an erroneous geometry is compensated. This gives a focused image. In regard to run time, the new routine is approximately 100 times faster than a brute-force approach, i.e. for this FGA problem. For a general problem, the run time reduction will be far greater. To be more specific: with x parameters and N values to assess for each parameter; it is anticipated that the computational effort will decrease exponentially by a factor close to N-x.
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2.
  • Vu, Viet Thuy, et al. (författare)
  • Experimental results on focusing moving targets in TerraSAR-X and TanDEM-X images
  • 2016
  • Ingår i: IEEE Radar Conference. - : IEEE Press. - 9781509008636 ; , s. 874-878
  • Konferensbidrag (refereegranskat)abstract
    • Moving targets appear in TerraSAR-X and TanDEM-X images in the form of elliptic or hyperbolic curves but they can be approximated to be lines. We present here the experimental results on refocusing moving targets directly in TerraSAR-X and TanDEM-X images. The refocusing method is developed from the Range Migration algorithm and the concept of normalized relative speed. The experimental results show that the target in TerraSAR-X and TanDEM-X images is well focused to the original shape. Motion parameters of the moving target can be further estimated thank to the pursuit mode of TerraSAR-X and TanDEM-X.
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3.
  • Vu, Viet Thuy, et al. (författare)
  • Local detection of moving target by focusing in SAR images
  • 2016
  • Ingår i: IEEE Radar Conference. - : IEEE Press. - 9781509008636 ; , s. 827-832
  • Konferensbidrag (refereegranskat)abstract
    • We present here a moving target detection method so-called local detection of moving target by focusing. The term local implies that the method only works with areas of interest but not whole SAR scene whereas the term focusing indicates that the method is based on the concept of relative movement. The mathematical background of the method is presented in details. The introduced method is then examined with simulated and experimental SAR data to evaluate the method as well as to show the practicality of the method. The reference SAR system for this study is CARABAS, an airborne UWB low frequency SAR system. The method shows a number of advantages in comparison to the original version.
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  • Resultat 1-3 av 3
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konferensbidrag (3)
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refereegranskat (3)
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Pettersson, Mats (2)
Vu, Viet Thuy (2)
Sjögren, Thomas (2)
Ulander, Lars, 1962 (1)
Hellsten, H. (1)
Torgrimsson, Jan, 19 ... (1)
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Dammert, P. (1)
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Blekinge Tekniska Högskola (2)
Chalmers tekniska högskola (1)
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Engelska (3)
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2016 (3)

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