Discrete Fourier transforms calculation procedure - involves performing calculation twice within given number of function repetitions

摘要

The transforms occur in echo signals of pulse Doppler radar stations. The Fourier transforms are twice calculated within 2N recurrences. After the calculation has been performed store holding the Fourier coefficients are erased. Instants of the two calculations and of the two store erasures are contained within the 2N recurrences spaced by N recurrences. After erasure of the respective store in one regeneration phase of N recurrences, the Fourier coefficients are again calculated. The calculation system uses several registers.