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

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

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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

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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”

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

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for (i=0; i

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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

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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

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

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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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Oscillations. Mass Spring The period is about 6.3 seconds, the frequency is 1/period=.016 Hz, the amplitude of velocity is about 23 m/s and the amplitude.

Oscillations. Mass Spring The period is about 6.3 seconds, the frequency is 1/period=.016 Hz, the amplitude of velocity is about 23 m/s and the amplitude.

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