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Entry  Fri Jan 15 12:04:26 2010, Sanjit, mevans, Update, Adaptive Filtering, Canceling noise again! OAF_15JAN2010.png
    Reply  Tue Jan 26 19:51:44 2010, Sanjit, rana, Update, Adaptive Filtering, OAF details C1ASS_TOP.pngC1SUS_SRM_XYCOM1.pngUntitled.png
       Reply  Mon Feb 1 18:31:00 2010, Sanjit, Update, Adaptive Filtering, OAF details 
          Reply  Mon Feb 1 21:51:12 2010, Sanjit, Update, Adaptive Filtering, OAF details 
       Reply  Fri Feb 5 00:52:55 2010, Sanjit, Update, Adaptive Filtering, OAF at 0.1-1.0 Hz OAF_04FEB2010_noOAF.pngOAF_04FEB2010.png
          Reply  Fri Feb 5 01:04:58 2010, Sanjit, Update, Adaptive Filtering, OAF at > 5Hz OAF_04FEB2010_highFreq.png
             Reply  Sat Feb 6 00:10:08 2010, Sanjit, Update, Adaptive Filtering, OAF at > 5Hz 
Message ID: 2571     Entry time: Fri Feb 5 00:52:55 2010     In reply to: 2548     Reply to this: 2572
Author: Sanjit 
Type: Update 
Category: Adaptive Filtering 
Subject: OAF at 0.1-1.0 Hz 

 

At 0.1-1.0Hz, there is some coherence between MC_L and RANGER_Y & GUR_Y, see the first figure. Also GUR_Z has low noise there. So I used all five of them, increased the gains of GUR_Z from 0.1 to 0.5. Some improvement near 0.5Hz. We possibly can not do any better with these PEM measurement, as the coherence of the adapted error signal and the PEM channels is almost zero, see the second figure. May be we need to think about placing the seismometers at different places/orientations.

However, there is lot more scope at higher frequencies, lot of coherence at 5-100Hz.

 

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