Comparison of calibration techniques in the presence of rapidly-varying atmospheric phase

Dataset

  • EVLA BnA-configuration continuum dataset
  • Date = May 29, 2011
  • Frequency = 19-21 GHz (1.5 cm)
  • 16 subbands of 128 MHz bandwidth each
  • beamsize~0.3", baselines 14-1400 kilolambda
  • similar to ALMA ES extended at Band 9
  • zenith opacity ~ 0.03
  • elevation of target ~ 20 deg, so tau ~ 0.09
  • phase calibrator flux density ~ 1.7 Jy
  • flux calibrator flux density ~ 3 Jy
  • rms phase on phase calibrator in 2 second integrations after calibration = 9 degrees

Raw data for spw01 RR (19.2 GHz) on a typical long baseline (ea20&ea01)

Raw phase on the calibrators Zoom to 1 minute on phase calibrator

Comparison of corrected data (all baselines)

  • Plots are on identical scale!

Data Integration-based phase calibration solution applied Scan-based phase calibration solution applied
amplitude
vs.
time
phase
vs.
time
rms phase 8.9 degrees 20.8 degrees
amplitude
vs.
uvdist
phase
vs.
uvdist

Comparison of corrected data (baseline ea01&ea20 only)

amplitude
vs.
time
phase
vs.
time
rms phase 10.4 degrees 19.7 degrees

Return to Data reduction workshop

-- ToddHunter - 2011-09-06
Topic attachments
I Attachment ActionSorted ascending Size Date Who Comment
K_BnA_cont_multi.ms.pngpng K_BnA_cont_multi.ms.png manage 39 K 2011-09-07 - 10:39 ToddHunter plotants
intbased_phase_spw1_ea01ea20.pngpng intbased_phase_spw1_ea01ea20.png manage 17 K 2011-09-07 - 12:07 ToddHunter  
intbased_phase_vs_time_spw1.pngpng intbased_phase_vs_time_spw1.png manage 16 K 2011-09-07 - 11:28 ToddHunter  
intbased_spw1.pngpng intbased_spw1.png manage 16 K 2011-09-07 - 10:30 ToddHunter calibrated amplitude vs. time (integration-based phase)
intbased_spw1_amp_uvdist.pngpng intbased_spw1_amp_uvdist.png manage 14 K 2011-09-07 - 15:00 ToddHunter  
intbased_spw1_ea01ea20.pngpng intbased_spw1_ea01ea20.png manage 15 K 2011-09-07 - 12:16 ToddHunter  
intbased_spw1_fixedscale.pngpng intbased_spw1_fixedscale.png manage 14 K 2011-09-07 - 11:43 ToddHunter  
intbased_spw1_phase_uvdist.pngpng intbased_spw1_phase_uvdist.png manage 19 K 2011-09-07 - 15:15 ToddHunter  
reduce_Kband.py.txttxt reduce_Kband.py.txt manage 6 K 2011-09-07 - 17:24 ToddHunter  
reduce_Kband_workshopdemo.py.txttxt reduce_Kband_workshopdemo.py.txt manage 6 K 2011-09-07 - 17:23 ToddHunter  
scanbased_phase_spw1_ea01ea20.pngpng scanbased_phase_spw1_ea01ea20.png manage 19 K 2011-09-07 - 12:10 ToddHunter  
scanbased_phase_vs_time_spw1.pngpng scanbased_phase_vs_time_spw1.png manage 18 K 2011-09-07 - 11:24 ToddHunter  
scanbased_spw1.pngpng scanbased_spw1.png manage 15 K 2011-09-07 - 11:19 ToddHunter  
scanbased_spw1_amp_uvdist.pngpng scanbased_spw1_amp_uvdist.png manage 17 K 2011-09-07 - 15:00 ToddHunter  
scanbased_spw1_ea01ea20.pngpng scanbased_spw1_ea01ea20.png manage 15 K 2011-09-07 - 12:16 ToddHunter  
scanbased_spw1_phase_uvdist.pngpng scanbased_spw1_phase_uvdist.png manage 30 K 2011-09-07 - 15:15 ToddHunter  
uncalibrated_phase_vs_time_spw1_ea20ea01.pngpng uncalibrated_phase_vs_time_spw1_ea20ea01.png manage 24 K 2011-09-07 - 10:47 ToddHunter uncalibrated phase vs. time (full track)
uncalibrated_phase_vs_time_spw1_ea20ea01_1minute.pngpng uncalibrated_phase_vs_time_spw1_ea20ea01_1minute.png manage 14 K 2011-09-07 - 11:07 ToddHunter  
uncalibrated_spw1.pngpng uncalibrated_spw1.png manage 17 K 2011-09-07 - 10:33 ToddHunter uncalibrated amplitude vs. time (integration-based phase)
Topic revision: r4 - 2011-09-07, ToddHunter
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