Data Quality Reports for Session: 110989 User: perez Completed: 03/13/2008


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D990106.2SGP/MWR/B5 - Software ChangesgpmwrlosB5.a1
D990113.1SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1,
sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0


DQRID : D990106.2
Start DateStart TimeEnd DateEnd Time
02/12/1994000002/10/19982359
Subject:
SGP/MWR/B5 - Software Change
DataStreams:sgpmwrlosB5.a1
Description:
The MWR operating software was changed on 12 February 1998 to provide additional 
functionality as described below. This change affects the format of the raw and ingested data. 
   
NEW FEATURES
1. Faster sampling rate
   
Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 
20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per 
blackbody sample and gain update.)
   
2. More flexible sampling strategy
   
Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. 
This permits sky samples to be acquired at intervals of 2.67 seconds for improved 
temporal resolution of cloud liquid water variations and better coordination with the millimeter 
cloud radar during IOPs.
   
3. Separation of zenith LOS observations from TIP data
   
When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV 
and LWP computed and reported separately in the output file. This eliminates the periods 
of missing LOS data during calibration checks/updates.
   
4. Automatic self-calibration
   
The software now permits the calibration to be updated at specified intervals or 
continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified 
intervals or whenever clear sky conditions occur, the tip data reduced, the calibration 
updated, and the radiometer returned to LOS mode without operator intervention. In the 
second case, the radiometer is continuously is TIP mode until changed by the operator.
   
5. Graphical user display
   
The graphical display is comprised of a status display, a message display, a temperature 
plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip 
curves.
Measurements:sgpmwrlosB5.a1:
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Ambient temperature(tkair)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • (tknd)


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DQRID : D990113.1
Start DateStart TimeEnd DateEnd Time
07/21/1993140601/12/19992359
Subject:
SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27)
DataStreams:sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1,
sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0
Description:
At 00:00 GMT on 7 January version 3.27 of the MWR operating program was installed and made 
operational at the SGP central facility (C1).  No problems were noted over the next few 
days and the boundary facility MWRs (B1, B4, B5, B6) were upgraded at 20:00 GMT on 11 
January.  This version includes a beam width correction I developed as well as providing the 
capability to automatically level the elevation mirror (that is, to automatically detect 
and correct offsets in the elevation angle stepper motor position.)

On 12 January I discovered that the '486-based MWR computers at B1, B4 and B6 were not 
executing the system command to move and rename the data files so that the ARM data system 
could retrieve them.  Reducing the length of the storage arrays in the auto-leveling 
feature from 1000 to 250 resolved the problem.  This results in the auto-leveling being based 
on only 4 hours of clear sky data rather than 16 hours at B5 and C1.  This version of the 
program is 3.28. Version 3.27 (running at B5 and C1) can be installed if and when these 
computers are upgraded to Pentium-class machines.

The improvement in the quality of the tip curves resulting from the auto-leveling has been 
dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 
degrees) have been reduced from +/- 5 K to +/- 0.5 K.  The goodness-of-fit coefficient for 
the tip curves has improved from about 0.995 to over 0.998.  In order to take full 
advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the 
goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998.

Editor's Note: The SGP.C1 data were reprocessed in 2004 to produce a common DOD for all 
time.  The 1996-1998 data reprocessing included beam width and mirror-leveling corrections, 
but the data prior to that range did not have these corrections applied.
Measurements:sgpmwrtipB1.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)

sgpmwrlosB5.a1:
  • 31.4 GHz sky brightness temperature(31tbsky)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)

sgpmwrtipB5.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)

sgpmwrlosB1.a1:
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)

sgpmwrlosC1.b1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)

sgpmwrtipB6.a0:
  • 23.8 GHz sky signal(23tipsky)
  • 31.4 GHz sky signal(31tipsky)

sgpmwrtipB4.a0:
  • 31.4 GHz sky signal(31tipsky)
  • 23.8 GHz sky signal(23tipsky)

sgpmwrlosC1.a1:
  • Sky brightness temperature at 31.4 GHz(tbsky31)
  • MWR column precipitable water vapor(vap)
  • Sky brightness temperature at 23.8 GHz(tbsky23)
  • Averaged total liquid water along LOS path(liq)

sgpmwrlosB4.a1:
  • 31.4 GHz sky brightness temperature(31tbsky)
  • Averaged total liquid water along LOS path(liq)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)

sgpmwrlosB6.a1:
  • Averaged total liquid water along LOS path(liq)
  • 31.4 GHz sky brightness temperature(31tbsky)
  • 23.8 GHz sky brightness temperature(23tbsky)
  • MWR column precipitable water vapor(vap)


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