文档介绍：7th IVS General Meeting, Madrid Spain
Effects of Tropospheric Spatio-Temporal
Correlated Errors on the
Analysis of Space Geodetic Data
Andres Romero-Wolf,
. Jacobs, and J. T. Ratcliff
Jet Propulsion Laboratory,
California Institute of Technology
March 6, 2012
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6, 2012 A. Romero-Wolf 1
Motivation
• VLBI error budget (becoming less Gaussian dominated).
• Reduction of thermal errors will require modeling of correlated noise
sources.
• Troposphere errors have correlations in both space and time.
– Kolmogorov frozen flow model.
– Modeling delay errors Treuhaft & Lanyi (Radio Sci. 1987)
– Water vapor radiometer (WVR) measurements.
• Instrumental errors introduce station specific temporal correlations.
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6, 2012 A. Romero-Wolf 2
Thermal Errors
Recording Rate Improve
128 Mb/sec - Last 10 years
256 Mb/sec Recent RDV runs
512 Mb/sec 2 VLBA continuum
2 Gb/sec 4 Mark 5C (R&D fringes)
4 Gb/sec Mark 5C dual bank
16-32 Gb/sec -16 Haystack Mark 6
Data rates are sky-rocketing.
Factors of 10 improvement in the near future.
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6, 2012 A. Romero-Wolf 3
Future: Trop. Turbulence Dominates
Measured with the JPL Advanced Water Vapor Radiometer
• Monitor 22 GHz/ water