Nonparametric Frequency Estimation Below Two Signal Periods Using Two Windows and DFT

This paper proposes a method to estimate the frequency when only two signal periods of a multi-frequency signal is acquired using the nonparametric estimation approach in the frequency domain. In estimation, the weights of two Rife-Vincent I windows are used on the same set of samples and after that a combination of two successive DFT amplitude coefficients are put in the quotient. For reduction of the harmonic and the interharmonic leakages a procedure can be added to determine the periodic part of the signal. The obtained results show a very good compromise between fast and accurate estimation.