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Statistical simulation methods are use used to investigate the noise immunity and speed of response of five methods of measuring the frequency of short harmonic signals and noise.In the processing of subsonic harmonic waves or radio-frequency pulses with a few periods (e.g., in Doppler velocity meters) there is a need of measuring signal frequency during a short time interval equal to 0.5-2 oscillation periods. The investigated harmonic signal is assumed to be received on the background of normal white noise ~(t) with zero average value and a standard deviation (SD) ~S, i.e., the frequency co must be evaluated from a short sample of signal values:

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