dipoles), high sensitivity. 9 international stations = superterp • Very fast sampling rate (5 ns), reduced to 5.12 µs for the station beams. • Large fields of view, 10 to 100s of square degrees. • Not used for all LOFAR KSPs. Thursday, 15 December 2011
SAT • Working prototype for non-image processing • Real-time searches for Individual Radio Pulses using CPU/GPU • Dedispersion over 4000 DMs per beam in real time with GPUs • Pilot survey 1: 6-8 beams tracking circumpolar targets • Pilot survey 2: 6 beams fixed on the meridian from 8o to 28o dec Pipeline diagnostic plot from Pilot survey – daily summary from one of six beams Receive udp stream Polyphase filter Raw to Stokes RFI removal Dedispersion output S/N DM Time (s) Aris Karastergiou ([email protected]) Crab Thursday, 15 December 2011
including pulsars and frequency swept radio emitters (HAMSAT). Anticoincidence experiments with Effelsberg + Nancay will reveal nature of enigmatic detections • Performed on 800 mbps streams • Each node has: 12 Xeon CPU cores + 1 NVIDIA M2050 (or GTX) • DM processing is ~10x better than real time • RFI rejection performing well in very contaminated environment Dispersion measure pc/cm3 Time (s) Time (s) Aris Karastergiou ([email protected]) Thursday, 15 December 2011
2. Match model to data 3. Subtract model and filter 4. Store spectrum stats in ring buffer 5. Update model with running averages Thursday, 15 December 2011
DM time (s) GPU dedispersion: 4000 dispersion measures searched, only pulses from B0329+54 detected, no spurious signals filterbank noise pre-filtering filterbank noise post-filtering Thursday, 15 December 2011
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