METHOD FOR ESTIMATING THE FREQUENCY OF A TIME SIGNAL

摘要

The invention relates to a method for estimating the frequency of a time signal by means of a discrete Fourrier transformation and interpolation between support points of the DFT spectrum. According to said method, the hamming window is used in a known manner for filtering and the interpolation is carried out according to a mathematically calculated solution. The method makes use of the fact that a function of the third degree which can serve as a correction distance has a clear solution within the definition range of the amount ratio between a secondary maximum and a primary maximum of the DFT spectrum. The correction distance is calculated according to this solution on the basis of the ratio of the secondary maximum and the primary maximum.