Data Quality Reports for Session: 104664 User: payalmehta Completed: 03/07/2007

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060419.4NIM/MWR/M1 - Instrument noise problem/RF interferencenimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1
D060718.1NIM/MWR/M1 - Radiometer occasionally overheatingnimmwrlosM1.b1, nimmwrtipM1.a1


DQRID : D060419.4
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWR/M1 - Instrument noise problem/RF interference
DataStreams:nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1
Description:
Data are affected by intermittent spikes that become more frequent starting in March 2006. 
Spikes affect data mostly around 9 AM and 18:00 PM. The origin of the spikes is probably 
RF interference.
Measurements:nimmwrlosM1.b1:
  • Mean total liquid water amount along LOS path(liq)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Mean total water vapor amount along LOS path(vap)
  • 31.4 GHz sky signal(sky31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • 23.8 GHz sky signal(sky23)
nimmwrM1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)
nimmwrtipM1.a1:
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 23.8 GHz sky signal(tipsky23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)

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DQRID : D060718.1
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWR/M1 - Radiometer occasionally overheating
DataStreams:nimmwrlosM1.b1, nimmwrtipM1.a1
Description:
The radiometer is occasionally thermally unstable. The thermal instability occurs when the 
air temperature exceeds approximately 42.8 degree C (about 316-317 K).
This has been happening since March. The most affected months are
March, May, and June.
Measurements:nimmwrlosM1.b1:
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Mean total water vapor amount along LOS path(vap)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise diode mount temperature(tknd)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Blackbody kinetic temperature(tkbb)
  • 23.8 GHz sky signal(sky23)
  • Mean total liquid water amount along LOS path(liq)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • 31.4 GHz sky signal(sky31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz Blackbody signal(bb31)
nimmwrtipM1.a1:
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz Blackbody signal(bb31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz Blackbody signal(bb23)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • 23.8 GHz sky signal(tipsky23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Blackbody kinetic temperature(tkbb)
  • Noise diode mount temperature(tknd)

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