Adaptive algorithms for low-latency cancellation of seismic Newtonian-noise at the Virgo gravitational-wave detector
arxiv(2024)
摘要
A system was recently implemented in the Virgo detector to cancel noise in
its data produced by seismic waves directly coupling with the suspended test
masses through gravitational interaction. The data from seismometers are being
filtered to produce a coherent estimate of the associated gravitational noise
also known as Newtonian noise. The first implementation of the system uses a
time-invariant (static) Wiener filter, which is the optimal filter for
Newtonian-noise cancellation assuming that the noise is stationary. However,
time variations in the form of transients and slow changes in correlations
between sensors are possible and while time-variant filters are expected to
cope with these variations better than a static Wiener filter, the question is
what the limitations are of time-variant noise cancellation. In this study, we
present a framework to study the performance limitations of time-variant noise
cancellation filters and carry out a proof-of-concept with adaptive filters on
seismic data at the Virgo site. We demonstrate that the adaptive filters, at
least those with superior architecture, indeed significantly outperform the
static Wiener filter with the residual noise remaining above the statistical
error bound.
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