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Waveform Design for Point-Like and Extended Targets in SISO and MIMO Radars

Karbasi, Mohammad | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47468 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Bastani, Mohammad Hassan; Naghsh, Mohammad Mahdi
  7. Abstract:
  8. Transmit waveform plays a significant role in active sensing systems. High speed and off-the-shelf processors, digital arbitrary waveform generators, and solid state transmitters have paved the way for an increased capability to adapt the transmit signal and the receive fil-ters with respect to (w.r.t.) the illuminated environment. In this thesis, we have considered the waveform design problem for different scenarios, in two parts. Firstly, we have con-sidered the problem for the extended target model in single-input single-output (SISO) radars. There, we have assumed known target impulse response (TIR) with an unknown reflection factor and found the waveform corresponding to the optimal detection probabil-ity. The peak-to-average-power ratio (PAR) and similarity constraint sets are also consid-ered. Then, we have introduced a new framework to obtain robust waveforms w.r.t. the ambiguities about the TIR. Secondly, we have considered the point-like target model in multiple-input multiple-output (MIMO) configurations. We have devised a method to op-timize the received signal-to-interference-plus-noise ratio (SINR) with conferred robustness against knowledge mismatches occured for the clutter and other interfering scatterers. A constant-modulus design is also introduced for the same framework. Finally, the design problem for an extended target in a MIMO radar is studied in a separate chapter. Our results highlight that, the proposed design methods have overcome the conventional radar waveforms. Moreover, we have assessed the effect of the design parameters on the objective functions. Finally, we have realized in our numerical results that, it is possible to enforce limited PAR or constant-modulus constraints on the sought waveform and achiecve, at the same time, almost the same performance of the unconstrained design
  9. Keywords:
  10. Waveform Design ; Multiple Input Multiple Output (MIMO)System ; Single-Input Single-Output (SISO)Radar ; Multi-Input Multi-Output (MIMO)Radar ; Extended Target Model ; Signal-Dependent Interference

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