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Water vapor radiometer measurements of the tropospheric delay fluctuations at Goldstone over a full yearOne year of near-continuous water vapor radiometer (WVR) measurements at DSS 13 has provided a database for characterizing the Goldstone tropospheric delay properties in a statistical sense. The results have been expressed in terms of the Allan standard deviation of delay and compared to a previous model for Goldstone fluctuations and the specifications of the Cassini Gravitational Wave Experiment (GWE). The new WVR data indicate that average fluctuation levels at hour time scales or less are approximately 30 percent lower than the earlier Goldstone model predictions. At greater than 1 h time scales, the WVR indicated fluctuation levels are in closer agreement with the model, although noise floor limitations may be artificially raising the average WVR-derived atmospheric fluctuation levels at the longer time scales. When scaled to two-way Doppler tracking at 20 deg elevation, as will occur for the GWE, these results indicate that Goldstone winter tropospheric delay fluctuations will typically be a factor of 10 larger than the GWE requirements at 1000 s and a factor of 4 larger at 10,000 s.
Document ID
19960009473
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Keihm, S. J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
August 15, 1995
Publication Information
Publication: The Telecommunications and Data Acquisition Report
Subject Category
Geophysics
Accession Number
96N16639
Funding Number(s)
PROJECT: RTOP 314-30-11-90-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19960009472Collected WorksThe Telecommunications and Data Acquisition Report
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