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We apply the independent component analysis (ICA) to the real data from agravitational wave detector for the first time. Specifically we use the iKAGRAdata taken in April 2016, and calculate the correlations between thegravitational wave strain channel and 35 physical environmental channels. Usinga couple of seismic channels which are found to be strongly correlated with thestrain, we perform ICA. Injecting a sinusoidal continuous signal in the strainchannel, we find that ICA recovers correct parameters with enhancedsignal-to-noise ratio, which demonstrates usefulness of this method. Among thetwo implementations of ICA used here, we find the correlation method yields theoptimal result for the case environmental noises act on the strain channellinearly.

Application of the independent component analysis to the iKAGRA data