COSMIC

1
GPS Comparisons
John J. Braun COSMIC Program University
Corporation for Atmospheric Research Boulder,
Colorado
2
Outline

• Comparisons to Water Vapor Radiometer
• ARM radiometrics instruments
• Comparisons to Year 2001
• Comparison of GPS Processing Packages

3
GPS Stations In IHOP_02 Region
HBRK
LMNO
VCIO
HKLO
41 Stations Total
PRCO
4
ARM Central Facility - Lamont, OK (LMNO)
5
ARM Central Facility - SuomiNet Station
6
Station Hillsboro, KS (HBRK)
7
Station Haskell, OK (HKLO)
8
Station Purcell, OK (PRCO)
9
Station Vici, OK (VCIO)
10
IHOP Results Compared to YR 2001 Results
Station RMS IHOP RMS BIAS IHOP BIAS
HBRK 1.5 mm 1.5 mm -0.9 mm -0.6 mm
HKLO N/A 1.2 N/A 0.3
LMNO 1.5 1.3 -0.9 -1.1
PRCO 1.6 1.3 -1.9 -1.4
SG01 N/A 1.2 N/A -0.9
VCIO 1.3 1.5 -1.6 -0.2
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Conclusions

• GPS - WVR Comparisons have been made
• Only comparing PW results.
• There have been no quantitative comparisons of SW
  and tomography
• GPS tends to be dry with respect to WVR.
• GPS solutions between processing packages have
  not been completed yet for IHOP 2002, but
  previous comparisons show very good agreement.