Automatic Detection and Suppression of Parasitic Chirp Signals in the Intermediate Time–Frequency Domain

Abstract

The problem of automatic parasitic chirp components detection and suppression in a digital signal is considered. The detection is based on the calculation of the discrete Wigner distribution accompanied by the Hough transform. The filtration is achieved by a series of discrete fractional Fourier transforms converting the signal to special coordinates, where the entire energy of the parasitic signals is accumulated at a few samples and then reset. The main novelty is the utilization of new construction of discrete fractional Fourier transform coordinated with the discrete Wigner distribution. The advantages of the proposed approach are illustrated by the simulations.