DQRID : D030214.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
07/31/2002203411/05/20021815Does not affect quality
more
Subject:
SGP/MWR/B4/C1 - LOS cycle skipping
DataStreams:sgpmwrlosB4.a1, sgpmwrlosC1.a1, sgpmwrlosB4.b1, sgpmwrlosC1.b1
Description:
When MWR software version 4.12 was installed at the SGP, it was observed 
that the MWRs at CF and BF4 skip line-of-sight (LOS) observing cycles. In LOS mode, the 
software begins an observing cycle at 0, 20, and 40 seconds after the minute to provide 3 
LOS cycles per minute. If a cycle is delayed so that it takes more than 20 seconds to 
complete, then the next start time is missed, the cycle is skipped, and the data that would 
have been acquired are lost.  

It was demonstrated that the interaction with the IRT at CF slowed the MWR observing cycle 
noticeably and contributed significantly to the LOS cycle skipping. The IRT was removed 
from the MWR on 5 November 2002 and the LOS cycle skipping at the CF was resolved.  The 
IRT data are now available in a new separate datastream: sgpirtC1.a1 (and soon 
sgpirt2sC1.a1).

The BF4 cycle skipping may have resulted from a combination of an additional air 
temperature sensor on this instrument and the use of a fiber optic cable.  However, the cycle 
skipping on this instrument appears to have abated without modifications to the instrument 
configuration.
Suggestions: 
Measurements:sgpmwrlosB4.a1:
  • tknd
  • tbsky23
  • tnd_nom23
  • tc23
  • tkbb
  • tnd31
  • bbn31
  • tbsky31
  • tnd_nom31
  • sky23
  • vap
  • bb23
  • wet_window
  • liq
  • sky31
  • bb31
  • sky_ir_temp
  • tc31
  • tkair
  • bbn23
  • tnd23
  • tkxc
more
sgpmwrlosC1.a1:
  • sky23
  • tbsky23
  • wet_window
  • tknd
  • vap
  • tnd_nom23
  • sky_ir_temp
  • liq
  • sky31
  • tc31
  • bbn23
  • tnd_nom31
  • bb23
  • tnd31
  • tkbb
  • tc23
  • bbn31
  • tkxc
  • tbsky31
  • bb31
  • tnd23
  • tkair
more
sgpmwrlosB4.b1:
  • vap
  • bbn31
  • sky_ir_temp
  • tnd31
  • tc31
  • bb31
  • tkxc
  • tkair
  • bbn23
  • tnd23
  • wet_window
  • tnd_nom31
  • sky31
  • tnd_nom23
  • tbsky23
  • tkbb
  • sky23
  • tknd
  • tc23
  • liq
  • tbsky31
  • bb23
more
sgpmwrlosC1.b1:
  • sky23
  • tc23
  • wet_window
  • tkbb
  • tnd_nom31
  • tc31
  • tbsky31
  • time_offset
  • bbn31
  • tnd_nom23
  • tkxc
  • tbsky23
  • tnd23
  • sky_ir_temp
  • bbn23
  • tkair
  • vap
  • bb31
  • liq
  • tnd31
  • bb23
  • tknd
  • sky31
more

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