Instantaneous frequency estimation for a sinusoidal signal combining DESA-2 and notch filter

In this paper, we propose a new frequency estimation method for a sinusoidally modulated signal. The proposed method is constructed by three processing; the noise reduction, the frequency estimation, the updating of the noise reduction filter. In the noise reduction, we utilize an adaptive IIR bandpass filter which can extract only a specific frequency components. In the frequency estimation, we employ DESA-2, which is a non-linear operator with low computational complexity. The extraction frequency of the bandpass filter is effectively updated by integrating the estimation results of DESA-2 and the gradient estimation method. Through the estimation simulation for the noisy fluctuate sinusoidal signal, we show that the proposed method can estimate the instantaneous frequency accurately.