Vol. 16, issue 04, article # 4

pdf Afanas'ev V. V., Il'in G. I. Rejection of quasideterministic random processes when measuring phase difference in optical systems for atmospheric studies. // Atmospheric and oceanic optics. 2003. V. 16. No. 04. P. 292-294.
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It is shown that when measuring the phase difference of oscillations under nonstationary conditions in systems for optical investigation of the atmosphere and ocean, separation of the useful signal from a mixture with a nonstationary fluctuating process having the 1/f type spectrum is required. Rejection algorithms for quasideterministic nonstationary current average processes with the 1/f type spectrum are proposed and examined. It is found that at rejection of fluctuating processes with the 1/f type spectrum under nonstationary conditions, detection of harmonic phase signals with an amplitude of 10-7 rad is possible under long-term relative instability of laser frequency up to 10-9 and short-term relative instability less than 10-24.