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Local ANITA Group Meeting
Stephen Hoover
25 June 2009
Veto Antennas
Veto Antenna Cut
• Final cut:– Remove events with
• veto Vpkpk > 235 mV + 0.5 * Seavey Vpkpk
• and veto Vpkpk > 1.1 * Seavey Vpkpk
• This removes 28 events (in 10% data)– 5 cal pulser
– 5 payload blast
– 3 probably on-payload
– 3 loud CW from South Pole
– 5 ambiguous & messy, possibly off-payload
– 7 probably off-payload – aliased 150 MHz?
Final Event Quality Cuts• Remove events which have
– Trigger type other than RF– Hardware-marked sync slip (otherflag2)– Trigger time between 40 and 150 ns (cal pulser)– Have 12 or more upper ring antennas with Vpkpk > 250 mV
in v-pol or h-pol– Have SURF saturation– Veto antenna Vpkpk too large compared to Seavey Vpkpk– Have fewer than 240 points in a waveform– Have Vpkpk abnormally small (RFCMs off)– Seavey RFCM relay marked off in header– Veto RFCM relay marked off in header– Trigger time is within 600 ns of an LDB ground pulser– Trigger time is consistent with a Taylor Dome signal
Non-RF trigger 13,160 7,921
Marked sync slip 953 482
Cal pulser time 398 35
“Payload blast” 937 112
SURF Saturation 972 2
Veto antenna Vpkpk large 732 28
Short waveform 125 120
Tiny Vpkpk 573 271
Seavey RFCM off 400 0
Veto RFCM off 708 303
LDB trigger time 6,291 1,143
TD trigger time 158 158
# failing# failing, if this cut were the last
Total events cut in 10%: 17,085 events of 778,725 (2.2%)
Reconstructed Signal Directions:v-pol Noise (payload coordinates)
Direction of maximum cross-correlation in payload coordinates10% data, noise sample (but allowing events which trigger the adaptive filter)
Direction of maximum cross-correlation in external coordinates10% data, noise sample (but allowing events which trigger the adaptive filter)
Reconstructed Signal Directions:v-pol Noise (external coordinates)
Reconstructed Signal Directions:v-pol Noise (external coordinates)
Direction of maximum cross-correlation in external coordinates10% data, no satellite filter noise sample (but allowing events which trigger the adaptive filter)
Reconstructed Signal Directions:
Simulated Noise (payload coordinates)
Reconstructed Signal Directions:Simulated Signal (payload coordinates)
Range of SNRs, thrown flat in azimuth, flat in elevation from 5 to -20
Ratio of Peaks
2nd / 1st
Ratio of Peaks
3rd / 1st
(Simulated) Ratio of Peaks by SNRSignals reconstructing in the correct direction
(Simulated) Ratio of Peaks by SNRSignals reconstructing in the correct direction
and with a (simulated) hardware trigger
(Simulated) Ratio of Peaks by SNRSignals reconstructing in the wrong direction,
but with high rotated cross-correlation
Simulated Signal: Misreconstructions
Efficiencies on simulation
PointingEfficiency
(Simulated)HW triggerefficiency
SNR of misreconstructed signals
Other cuts vs SNR(Simulated events with correct pointing)