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Message ID: 1337     Entry time: Wed Feb 25 11:48:02 2009
Author: Jenne 
Type: Update 
Category: PEM 
Subject: Wiener filtering update - work on filtering some S5 DARM_CTRL data 

Quick update on my wiener filtering status:

Joe has been helping me get on the GRID, so I now have  a grid certificate, and accounts on most/all of the clusters.

Joe also helped me get menkar to get S5 data so that I can do wiener filtering to the back-data. 


I've been running the wiener filtering algorithm, and right now, it doesn't do anything to improve the DARM_CTRL data.  I am confident that this is because something is funky in the wiener filtering algorithm somewhere.  The indicator of this is that the wiener filtering calculation takes the same amount of time (~95 seconds) to calculate a filter for 64 seconds of data as for 1 hour of data (both for N = 2000 taps). 


For reference, attached are my plots for the wiener filtering result for (1) 64 seconds of S5 data, and for (2) 3600 seconds of S5 data.

These plots were made using H1:DARM_CTRL as the signal to minimize, with 4 seismometers as the witness channels (EX_SEISX, EY_SEISY, LVEA_SEISX, LVEA_SEISY)


I'm working on figuring out what's going on with the filtering algorithm, and why it does work for C1:MC_L minimization, but does not work for H1:DARM_CTRL minimization.




Attachment 1: h1_DARM_64s_4seis_25Feb09.png  12 kB  | Hide | Hide all | Show all
Attachment 2: h1_DARM_3600s_4seis_25Feb09.png  12 kB  | Show | Hide all | Show all
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