OSCILLATOR NOISE-ANALYSIS - MULTIVARIANCE MEASUREMENT

Since the noise altering the output signal of oscillators may be model ed as power laws in the spectral density of frequency deviation, oscil lator noise analysis is the measurement of the level of each power law noise. The principle of this new multivariance method consists of obt aining the noise-type contributions with different variances and diffe rent integration time values. The whole data obtained from the differe nt variances with the different integration times are then operated si multaneously. Thus, the most probable measurement, in the sense of lea st squares, is obtained for each type of noise. Moreover, this method lends itself to an estimation of the uncertainty of the noise-type con tribution measurement, taking into account the dispersion of the varia nce results.