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Wide-band Direction Finding Based on Time Modulated Array

Javadi, Amir Mahdi | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57109 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Behnia, Fereidoon
  7. Abstract:
  8. This thesis studies the problem of finding direction of arrival reecieved signals. One of the methods of direction finding is Time Modulated Array (TMA). Recently, a lot of research has been carried on using TMA for direction finding. Indeed, ease of implementation and resistance to noise has made this method interesting for researchers. The major drawback of these methods is that the baseline of array antenna needs not to be bigger than half of the wavelength of the maximum frequency and if this criterion is not met, the results will be multiple ambiguous solutions. However, sometimes, it is needed to have a bigger baseline (for instance, the case in which diameter of the antennas is bigger than half of the wavelength of the maximum frequency or theoretically, the baseline needs be bigger for more accuracy and …). In this thesis, two different array structures are introduced in which the baselines can be M (an integer number) times bigger than half of the wavelength of the maximum frequency while the direction finding can be performed unambiguously. The first array structure includes 5 antennas, and two methods for direction finding based on this structure are proposed. The first one is an approximate method which is easy to implement and the second one is based on look-up table which is more accurate. Finally, numerical simulations have been carried out to show accuracy of the two methods. For the second array structure which includes 3 antennas, an analytical method has been developed. Numerical simulations show that this method is resistant to implementation imperfections
  9. Keywords:
  10. Direction of Arrival (DOA) Algorithms ; Fourier Series ; Time Modulated Array (TMA) ; Wide Band Direction Finding ; Disambiguation

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