Non-stationary interference suppression method based on Hilbert-Huang transformation and adaptive notch

The invention provides a non-stationary interference suppression method based on Hilbert-huang transformation and adaptive notch and relates to the interference suppression technical application field of a direct-sequence spread-spectrum communication system. Firstly, sampling results of accepted data are normalized; the Hilbert-Huang transformation is carried out on the normalized data to obtain a Hilbert spectrum; a threshold level for inhibiting noises and a direct-sequence spread spectrum is determined according to the Hilbert spectrum to obtain the non-stationary interference Hilbert spectrum; non-stationary interference instantaneous frequency is worked out according to the non-stationary interference Hilbert spectrum; parameters of an adaptive IIR lattice notch filter are determined by the non-stationary interference instantaneous frequency; the convolution operation between the sampling results and the impulse responses of the adaptive notch filter is carried out to obtain data after the inhibition of the non-stationary interference. The method fully utilizes the good adaptability and the energy accumulation of the Hilbert-Huang transformation and inhibits the non-stationary interference more effectively.