soma mukherjee, gwdaw7, kyoto, japan, 19/12/02, ligo-g030166-00-z1 robust detection of noise floor...
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Robust Detection of Noise Floor Drifts in Interferometric Data
Soma Mukherjee
Max Planck Institut fuer Gravitationsphysik
Golm, Germany.
GWDAW7, Kyoto, Japan, 19/12/02
Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Motivation :
Interferometric data has three components : Lines, transients, noise floor.Study of a change in any one of these without elimination of the other two will cause interference. Lines dominate.Presence of transients change the central tendency.“SLOW” nonstationarity of noise floor interesting in the analysis of several astrophysical searches, e.g. Externally triggered search.
Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Methods :
Running Median.
Computation of :
G(m)=V(Z t+m – Z t)/V(Z t+1 – Z t)
Z t : t th sample of a timeseries.
m: Lag.
Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Sequence :
Low pass and
resampleEstimate spectral
noise floor using
Running Median
Design FIR
Whitening filter.
Whiten data.
Clean lines.
Highpass.
Compute Running
Median of the
squared timeseries.
Construct
Variograms.
Thresholds set by
Simulation.
Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Soma Mukherjee, GWDAW7, Kyoto, Japan, 19/12/02, LIGO-G030166-00-Z
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Future :`To be run on full S1 data (LIGO/GEO).
More quantification of the Running Median and variogram.
To be tested on bandlimited data.
Automation and incorporation in the DCR underway.