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A Novel Model for Three-Dimensional Imaging Using Interferometric ISAR in Curved Target Flight Paths

Nasirian, Mahdi | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 45392 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Bastani, Mohammad Hasan
  7. Abstract:
  8. A Synthetic Aperture Radar (SAR) is a system which collects the received signal from a ground target area along linear motion of a flying vehicle carrying it, in order to provide a very high resolution 2D image of it. In Inverse SAR (ISAR), the radar is fixed on the ground and the data collection is performed along the linear motion of the aerial target. Using a second receiver antenna close to the main transceiver antenna of ISAR, it is possible to make a three-dimensional (3D) image of the target, or equivalently find the 3D coordinates of the target scattering points. Such system is called bistatic, monopulse or interferometric ISAR (InISAR). In the conventional model of ISAR, the flying object should have a linear trajectory with a constant speed and only small deviations from this trajectory can be compensated. Target motions which are highly nonlinear or curvy can’t be used in the conventional model. In this paper, we propose a new model for InISAR to process all collected data from the target, regardless of the form of the flight path. First, the complete flight path is approximated by the best set of successive rectilinear sections. After performing some required modifications, bistatic processing in each subaperture and finely calibrating the 3D images resulted from different segments (subapertures) the images are fused together. More accuracy for 3D positioning of the target scattering points or equivalently better resolution for its 3D imaging is achieved by this model because all parts of the flight path contribute in the images. This model is applicable to the common SAR or ISAR systems too. The equations required to extract the 3D coordinates of the points are extracted in this thesis and the effectiveness of the proposed model and its relations are shown by simulation
  9. Keywords:
  10. Data Fusion ; Wavefront ; Interferometric Inverse Synthetic Aperture Radar (InISAR) ; Bistatic Processing ; Monostatic ; Flight Path ; Subaperture

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