# Geometrical resampling S.Braccini, I.Ferrante, D.Passuello, O.Torre F.Antonucci, P.Astone, S.Frasca and C.Palomba.

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Geometrical resampling S.Braccini, I.Ferrante, D.Passuello, O.Torre F.Antonucci, P.Astone, S.Frasca and C.Palomba

TARGET PLANES (depending on direction only) EACH CROSSING A DELAY (ANTICIPATION) OF 1 SAMPLE BETWEEN PULSAR AND ANTENNA CLOCKS c  T 20 kHz

+9 +18 +26 WHAT IS “MASK” ? Compute how many planes are crossed each 100 s

3 x 10 5 operations for all run (1 direction) This mask can be applied for all possible spin down for any frequency for (i=0; i 86400 integers for 90 days MASK COMPUTATION f = 20000 Hz (VIRGO Sampling Frequency) Run = 90 days (Run length)  t = 100 s (Downsampling time) Mask = Run/Dt = 86400 (Mask length - integers)

INPUT DATA (20 kHz data cleaned in time and filtered in a wide band close to a central frequency) f 0 = 40 Hz and  f = 10 mHz MASK APPLICATION > 200 x 20.000100 x 20.000n x 100 x 20.000 2000000 th  1999991stApply for all spin down…… > 200 x 20.000100 x 20.000n x 100 x 20.000 “MOVING ANTENNA” “REST ANTENNA”

| ………………………………………………………….. > 86400 float for 90 days OUTPUT | ………………………………………………………….. >...................... Spin Down

for (i=0; i { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/9/2578382/slides/slide_7.jpg", "name": "for (i=0; i

Results obtained with 5 year old machines EGO Farm: INTEL XEON 1.7 GHz + memoria run bus 400 MHz (2GB RAM) - BOGOMIPS 3000 – Not Using Biprocessor COMPUTATIONAL COST (probably will be better) One direction with several spin-downs in 10 -7 of real time (for all band frequencies) Just 10 lines of software

offset = signal_sampling_frequency*downsampling_factor*sizeof(double); /*quanto si sposterebbe senza correzioni*/ fseek(signal,0,SEEK_SET); /*trova l'inizio del file di input*/ for (l=0;l { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/9/2578382/slides/slide_9.jpg", "name": "offset = signal_sampling_frequency*downsampling_factor*sizeof(double); /*quanto si sposterebbe senza correzioni*/ fseek(signal,0,SEEK_SET); /*trova l inizio del file di input*/ for (l=0;l

ACCURACY VS. FREQUENCY 4 kHz 20 kHz Already tested on circular orbit (see note)

NEXT STEP: End to End test on VSR1 of resampling part (in progress) INSERT IN THE FULL PIPELINE TO HAVE SCIENTIFIC DATA

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