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  Bilinear noise subtraction at the GEO 600 observatory

Mukund, N., Lough, J., Affeldt, C., Bergamin, F., Bisht, A., Brinkmann, M., et al. (in preparation). Bilinear noise subtraction at the GEO 600 observatory.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-9180-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-9183-2
Genre: Paper

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2001.00242.pdf (Preprint), 7MB
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2001.00242.pdf
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 Creators:
Mukund, Nikhil1, Author              
Lough, James1, Author              
Affeldt, Christoph1, Author              
Bergamin, Fabio1, Author              
Bisht, Aparna1, Author              
Brinkmann, Marc1, Author              
Kringel, Volker1, Author              
Lück, Harald1, Author              
Nadji, Severin Landry1, Author              
Weinert, Michael1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Physics, Instrumentation and Detectors, physics.ins-det
 Abstract: We develop a scheme to subtract off bilinear noise from the gravitational wave strain data and demonstrate it at the GEO 600 observatory. Modulations caused by test mass misalignments on longitudinal control signals are observed to have a broadband effect on the mid-frequency detector sensitivity ranging from 50 Hz to 500 Hz. We estimate this bilinear coupling by making use of narrow-band signal injections that are already in place for noise projection purposes. A coherent bilinear signal is constructed by a two-stage system identification process where the involved couplings are approximated in terms of stable rational functions. The time-domain filtering efficiency is observed to depend upon the system identification process especially when the involved transfer functions cover a large dynamic range and have multiple resonant features. We improve upon the existing filter design techniques by employing a Bayesian adaptive directed search strategy that optimizes across the several key parameters that affect the accuracy of the estimated model. The resulting post-offline subtraction leads to a suppression of modulation side-bands around the calibration lines along with a broadband reduction of the mid-frequency noise floor. The filter coefficients are updated periodically to account for any non-stationarities that can arise within the coupling. The observed increase in the astrophysical range and a reduction in the occurrence of non-astrophysical transients suggest that the above method is a viable data cleaning technique for current and future gravitational wave observatories.

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 Dates: 2020-01-01
 Publication Status: Not specified
 Pages: 8 pages, 8 figures
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 2001.00242
URI: http://arxiv.org/abs/2001.00242
 Degree: -

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