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Enhanced monopulse radar tracking using fractional Fourier filtering in the presence of interference

Elgamel, Sherif A.E.H. and Soraghan, J.J. (2010) Enhanced monopulse radar tracking using fractional Fourier filtering in the presence of interference. In: 11th International Radar Symposium IRS-2010, 2010-06-16 - 2010-06-18.

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Monopulse radars are used to track a target that appears in the look direction beam width. Significant distortion is produced when manmade high power interference (jamming) is introduced to the radar processor through the radar antenna main lobe (main lobe interference) or antenna side lobe (side lobe interference). This leads to errors in the target tracking angles that may cause target mistracking. A new monopulse radar structure is presented in this paper which addresses this problem. This structure is based on the use of optimal Fractional Fourier Transform (FrFT) filtering. The improved performance of the new monopulse radar structure over the traditional monopulse processor is assessed using standard deviation angle estimation error (STDAE) for a range of simulated environments. The proposed system configurations with the optimum FrFT filters is shown to reduce the interfered signal and to minimize the STDAE for monopulse processors.