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Applications of Hough Transform in Frequency Domain for Radar Systems

Hadavi, Mahdi | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40463 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Nayebi, Mohammad Mehdi
  7. Abstract:
  8. Hough transform is frequently used in radar applications. The structure of using this transformation in radars is so that it has been used only in Range radars which transmit short pulses and their primary goal is to make better estimation of the range of the targets. In this work, we introduce the ways in which we can use the Hough transform in Doppler radars which transmit long pulses and their primary goal is to make better estimation of target doppler. We must use Hough transform in time-doppler domain for this class of radars including continuous-wave radars. To prepare this time-doppler domain image some time-frequency transform must be applied to the radar received signal and a part of this search devotes to find the optimum time-frequency transform for this purpose. For analysis of Doppler radars, linear frequency-modulated (LFM) signals are at high importance. It can be proved that Wigner-Hough transform which is the combination of Hough transform and Wigner-Ville time-frequency transform, is optimum for detecting LFM signals in white Gaussian noise. Furthermore, some methods use the Hough transform in ambiguity function domain to reduce the computational load. Beside theoretical analysis, in this work we test the performance of mentioned methods in operational radar scenarios.

  9. Keywords:
  10. Radars ; Hough Transform ; Time-Frequency Analysis ; Wigner-Hough Transform ; Frequency Domain

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