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  5. THE WINDOWS WITH LOW POWER OF BETWEEN-FILTER LEAKAGE SYNTHESIS FOR DISCRETE FOURIER TRANSFORM

THE WINDOWS WITH LOW POWER OF BETWEEN-FILTER LEAKAGE SYNTHESIS FOR DISCRETE FOURIER TRANSFORM

N.P. Chornoborodova, M.P. Chornoborodov
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It is firstly offered linear method of weighting coefficients calculation for discrete Fourier transform (DFT). Obtained window functions for arbitrary amount of DFT points have a less power of between-filter leakage: gain-frequency characteristic's zeros coincide with DFT filters central frequencies, and degree of side lobe amounts to -42...-43 dB. It is proved why for DFT computation in radar applications the choice of these windows is more optimal then use of well-known functions with much lower degree of side lobe. There are given recommendations concerning changing the windows with low power of between-filter leakage, applied in radar 35D6 preprocessing, for more optimal. This will allow to decrease the DFT filters degree of side lobe for 3.5 dB.
Keywords: Fourier transform, weighting function, coefficients calculation, degree of side lobe