A simple and precise real-time four point single sinusoid signals instantaneous frequency estimation method for portable DSP based instrumentation

摘要

A simple and precise instantaneous frequency estimation method of single sinusoid signals, using four equal spaced samples, for portable DSP based instrumentation is proposed. An analytical formula is obtained. Four-point instantaneous frequency estimator is sensitive to deviation of the sampling rate and quantization noise. As a demonstration of its simplicity, by implementing the proposed algorithm, a DSP based instantaneous frequency meter was built and tested with satisfactory performance.