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

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Presentation on theme: "Geometrical resampling S.Braccini, I.Ferrante, D.Passuello, O.Torre F.Antonucci, P.Astone, S.Frasca and C.Palomba."— Presentation transcript:

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

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

3 WHAT IS “MASK” ? Compute how many planes are crossed each 100 s

4 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 integers for 90 days MASK COMPUTATION f = Hz (VIRGO Sampling Frequency) Run = 90 days (Run length)  t = 100 s (Downsampling time) Mask = Run/Dt = (Mask length - integers)

5 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 x n x 100 x th  stApply for all spin down…… > 200 x x n x 100 x “MOVING ANTENNA” “REST ANTENNA”

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

7 for (i=0; i

8 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 of real time (for all band frequencies) Just 10 lines of software

9 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

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

11 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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