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coherence function

Standard

ECSS-E-ST-32-11C - Modal survey assessment (31 July 2008)

Definition

measure of the degree of linear, noise-free relationship between the measured system input and output signals at each frequency

Notes

NOTE 1 The coherence function is defined as where w is the frequency Sff (w) is the power spectrum of the input signal Sxx (w) is the power spectrum of the output signal Sxf (w) is the inputoutput cross spectrum.
NOTE 2 g2 (w)=1 indicates a linear, noise-free relationship between input and output.
NOTE 3 g2 (w)=0 indicates a non causal relationship between input and output.

Relations

ECSS-E-ST-32-11C — noise
ECSS-E-ST-60-21C — noise
ECSS-E-ST-35C Rev. 1 — system
ECSS-S-ST-00-01C — system

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