Digital parametric method for measuring the frequency and phase difference of signals with slowly changing parameters
Andrey V. Nikitin, Sergey V. Perchenko · Radioelectronics Nanosystems Information Technologies · 2025
In this paper, we propose a digital parametric method for measuring the frequency and phase difference of signals with slowly varying parameters, allowing to update the estimates of these quantities on the sampling interval. The statistical characteristics of the proposed method are investigated. It is shown that to improve the accuracy of its operation it is reasonable to use decimation of signal samples. The recursive expressions for implementation of the method, requiring a minimum number of mathematical operations independent of the length of the sliding measurement interval, are given. The results of processing of model signals with slowly varying frequency and phase difference in the presence of amplitude modulation and additive noise are presented.