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.
Fourier transform, weighting function, coefficients calculation, degree of side lobe