DQRID : D030214.1
Start DateStart TimeEnd DateEnd Time
07/31/2002203411/05/20021815
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)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Blackbody kinetic temperature(tkbb)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 23.8 GHz sky signal(sky23)
  • Total water vapor along LOS path(vap)
  • 23.8 GHz Blackbody signal(bb23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky signal(sky31)
  • 31.4 GHz blackbody(bb31)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Ambient temperature(tkair)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Mixer kinetic (physical) temperature(tkxc)
more

sgpmwrlosC1.a1:  
  • 23.8 GHz sky signal(sky23)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • (tknd)
  • Total water vapor along LOS path(vap)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky signal(sky31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Blackbody kinetic temperature(tkbb)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • 31.4 GHz blackbody(bb31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Ambient temperature(tkair)
more

sgpmwrlosB4.b1:  
  • Total water vapor along LOS path(vap)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 31.4 GHz blackbody(bb31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Ambient temperature(tkair)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • 31.4 GHz sky signal(sky31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Blackbody kinetic temperature(tkbb)
  • 23.8 GHz sky signal(sky23)
  • (tknd)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Averaged total liquid water along LOS path(liq)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • 23.8 GHz Blackbody signal(bb23)
more

sgpmwrlosC1.b1:  
  • 23.8 GHz sky signal(sky23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Water on Teflon window (1=WET, 0=DRY)(wet_window)
  • Blackbody kinetic temperature(tkbb)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Time offset from base_time(time_offset)
  • 31.4 GHz blac2body+noise injection signal(bbn31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Mixer kinetic (physical) temperature(tkxc)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Ambient temperature(tkair)
  • Total water vapor along LOS path(vap)
  • 31.4 GHz blackbody(bb31)
  • Averaged total liquid water along LOS path(liq)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 23.8 GHz Blackbody signal(bb23)
  • (tknd)
  • 31.4 GHz sky signal(sky31)
more


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