A Fourier Transform-Based Frequency Estimation Algorithm

作者：Carboni Alberto; Ferrero Alessandro^*

来源：IEEE Transactions on Instrumentation and Measurement, 2018, 67(7): 1722-1728.

DOI：10.1109/TIM.2018.2803579

• Cosine windows
• fast Fourier transform (FT)
• frequency multiplier
• frequency-domain interpolation
• phase-locked loop
• synchrophasor

Nonsynchronous sampling conditions are the source of leakage errors in measurements based on digital signal processing. The optimal method to avoid such errors is to generate a synchronous sampling clock, whenever the input signal shows enough period stability to allow this. Such method, however, does not yield a straightforward evaluation of the input signal frequency, which is required in several applications. This paper proposes a modified synchronous clock generator that together with a modified frequency interpolation algorithm provides an accurate measurement of the input signal frequency when the only available information about the sampling clock is a given integer multiple of the input signal fundamental frequency.

• 出版日期2018-7