Improving the efficiency of spectral rejection of narrowband interference

When processing broadband signals to suppress narrowband interference, the following methods are used: spectral-weighted estimation of interference parameters with subsequent compensation, adaptive transversal filtering, spectral rejection. The capabilities of the known methods are limited by the effect of interference spectrum spreading. This effect leads to the need to zero out too large a section of the signal spectrum to suppress the interference. As a result, the signal is distorted. The second negative factor is that the interference is not completely removed and part of its spectral power remains in the signal. A method for increasing the efficiency of spectral rejection of narrowband interference in broadband signals is proposed. In the proposed method, double fragmentation of the signal is performed for each interference. The duration of the fragment is selected to provide an integer number of interference periods in the fragment. In the spectrum of the resulting fragment, one harmonic of the interference is zeroed out. After removing the interference, the signal's full duration is restored for two fragments. The results of modeling the process of rejecting two interferences with amplitudes 2 and 10 times greater than the amplitudes of the signal harmonics are presented. It is shown that adaptive signal fragmentation allows rejection of several interferences of any amplitude with minimal signal distortion.