The effect of spatial and temporal wet-troposphere fluctuations on connected element interferometry

Details The effect of spatial and temporal wet-troposphere fluctuations on connected element interferometry The effect of spatial and temporal wet-troposphere fluctuations on connected element interferometry

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989tdar.nasa...47e&link_type=abstract

In its The Telecommunications and Data Acquisition Report p 47-57 (SEE N89-27871 22-32)

Computer Science

Correlation, Errors, Interferometry, Moisture Content, Quasars, Troposphere, Variations, Water Vapor, Atmospheric Refraction, Time Lag, Wave Propagation

Scientific paper

Numerical integrations of the structure function of tropospheric inhomogeneities have been performed to assess the impact of water vapor fluctuations on connected element interferometry (CEI). The expectation value of the RMS troposphere error for a differential spacecraft-quasar observation is derived by integrating the spatial refractivity structure function along raypaths to both the spacecraft and quasar from two spatially separated sites. Correlations between the tropospheric conditions at the two sites, which can become significant for short baseline observations, are fully accounted for in this calculation. Temporal effects are treated by assuming a frozen-flow model in which a fixed spatial distribution blows over both sites. Two nominal observation scenarios are considered, along with variations to study the dependence of the resultant differential troposphere errors on baseline length, observation time, source separation angle, and elevation. Consecutive differential observations are found to be almost completely uncorrelated, implying that averaging many repeated differential observations can quickly reduce the troposphere error.

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