Data Quality Reports for Session: 140276 User: david1king Completed: 02/03/2012


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D110607.6NSA/KAZR/C1 - Polarizer rotatednsakazrciC1.b1, nsakazrgeC1.b1, nsakazr3253C1.a0


DQRID : D110607.6
Start DateStart TimeEnd DateEnd Time
05/12/2011230007/29/20110400
Subject:
NSA/KAZR/C1 - Polarizer rotated
DataStreams:nsakazrciC1.b1, nsakazrgeC1.b1, nsakazr3253C1.a0
Description:
The cross-polarization returns were higher than the co-polarization returns causing a 
positive linear depolarization ration.  This cannot be correct.  Upon further investigation, 
it was suggested that waveguide going to the antenna feed polarizer was possibly rotated 
by 45 degrees resulting in the antenna transmitting circular polarization rather than 
linear polarization.  Rotating the polarizer in June did not correct the problem.

It turns out that there is a polarizer in the antenna feed.  Rotated the OMT by 45 degrees 
and substituted micro-coax cable instead of waveguide.

During the time covered by this DQR, the "co-polarization" variables are circularly 
polarized opposite of the transmitted polarization.  The "cross-polarization" variables are the 
same circular polarization as the transmitted signal.
Measurements:nsakazrgeC1.b1:
  • Mean doppler velocity, cross-polar(mean_doppler_velocity_xpol)
  • cal_constant_xpol
  • signal_to_noise_ratio_xpol
  • Spectral width, cross-polar(spectral_width_xpol)
  • Mean doppler velocity, copolar(mean_doppler_velocity_copol)
  • Reflectivity, cross-polar(reflectivity_xpol)
  • Reflectivity, copolar(reflectivity_copol)
  • Spectral width, copolar(spectral_width_copol)
  • signal_to_noise_ratio_copol
  • cal_constant_copol

nsakazr3253C1.a0:
  • HLN(VN)

nsakazrciC1.b1:
  • cal_constant_copol
  • cal_constant_xpol
  • Mean doppler velocity, copolar(mean_doppler_velocity_copol)
  • Reflectivity, cross-polar(reflectivity_xpol)
  • signal_to_noise_ratio_xpol
  • Reflectivity, copolar(reflectivity_copol)
  • signal_to_noise_ratio_copol
  • Mean doppler velocity, cross-polar(mean_doppler_velocity_xpol)
  • Spectral width, cross-polar(spectral_width_xpol)
  • Spectral width, copolar(spectral_width_copol)


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