OSCILLATOR NOISE-ANALYSIS - MULTIVARIANCE MEASUREMENT

Since the noise altering the output signal of oscillators may be modeled as power laws in the spectral density of frequency deviation, oscillator noise analysis is the measurement of the level of each power law noise. The principle of this new multivariance method consists of obtaining the noise-type contributions with different variances and different integration time values. The whole data obtained from the different variances with the different integration times are then operated simultaneously. Thus, the most probable measurement, in the sense of least squares, is obtained for each type of noise. Moreover, this method lends itself to an estimation of the uncertainty of the noise-type contribution measurement, taking into account the dispersion of the variance results.