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)