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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 53118 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Nayebi, Mohammad Ali
- Abstract:
- In MTI radars, digital filters utilizing non-uniform sampling are used to remove the echo of stationary targets or the ones with minor Doppler shift. These targets usually are associated with significant reflection causing small, high-speed targets not to be detected. In this type of filters, the use of non-uniform sampling prevents the blind speed issue and causes the first blind speed to occur at higher frequencies. The performance of such filters is characterized by two criteria: Coefficients and periods. Therefore, coefficient optimization in filter design has a dominant role in maximizing clutter rejection. Also, period optimization is used to prevent generating deep nulls in the pass-band of the filter. In this thesis, the deviation of the designed filter from the ideal one in pass-band is minimized using the Least Square criterion. The coefficients have been optimized under a particular constraint: inducing nulls at limited numbers of frequency spots in the clutter rejection band. In order to optimize the periods, the signal to clutter Ratio is calculated by a repetitive loop with random periods to maximize the minimum signal to clutter ratio. Then, the performance of the proposed method and the other ones will be compared based on two criteria: Improvement factor and minimum signal to clutter ratio. Eventually, it is shown that the proposed method has better results
- Keywords:
- Nonuniform Sampling ; Clutter Suppression ; Pulse Repetition Frequency (PRF) ; Moving Targets Indication ; Stagnation Point ; Blind Speed
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