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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 47908 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Behnia, Fereidoon
- Abstract:
- Space-time adaptive processing (STAP) is one of the powerful algorithms for clutter suppression in airborne radars. In this algorithm, we need to estimate the covariance matrix of the range bin under test, exploiting adjacent range bins. Thus it is important for clutter to have the same space-time characteristics in different range bins; otherwise degradation will occur in clutter suppression. Therefore, traditional STAP is desired to be discussed in the side-looking mode in which clutters are range independent. In some situations, we need to employ STAP in the non-side-looking geometries of the arrays. For instance, sometimes it is needed to rotate the array to gain better coverage of the area, and also when unwanted rotation occurs due to errors in installation or environmental effects such as wind blowing. Therefore, we need some modifications in STAP to appear rangeindependent in non-side-looking mode. In this thesis, we use the symmetry property of Doppler to propose generalized STAP (GSTAP) in non-side-looking structure, in which, spatial steering vector is reconstructed in order to obtain a linear relationship between angle and Doppler in all range gates. We show that the property of range independency is achieved by utilizing GSTAP in all geometries of the array of antennas. Experimental results verified the performance of GSTAP as powerful clutter suppression algorithm in non-side-looking mode
- Keywords:
- Moving Target ; Airborne Radar ; Ground Clutters ; Displaced Phase Center Antenna (DPCA) ; Space-Time Adaptive Processing (STAP) ; Clutter Suppression
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