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The flight performance of the Galileo orbiter USOResults are presented in this article from an analysis of radio metric data received by the DSN stations from the Galileo spacecraft using an Ultrastable Oscillator (USO) as a signal source. These results allow the health and performance of the Galileo USO to be evaluated, and are used to calibrate this Radio Science instrument and the data acquired for Radio Science experiments such as the Redshift Observation, Solar Conjunction, and Jovian occultations. Estimates for the USO-referenced, spacecraft-transmitted frequency and frequency stability were made for 82 data acquisition passes conducted between launch (Oct. 1989) and Nov. 1991. Analyses of the spacecraft-transmitted frequencies show that the USO is behaving as expected. The USO was powered off and then back on in Aug. 1991 with no adverse effect on its performance. The frequency stabilities measured by Allan deviation are consistent with expected values due to thermal wideband noise and the USO itself at the appropriate time intervals. The Galileo USO appears to be healthy and functioning normally in a reasonable manner.
Document ID
19930020414
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Morabito, D. D. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Krisher, T. P. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Asmar, S. W. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
May 15, 1993
Publication Information
Publication: The Telecommunications and Data Acquisition Report
Subject Category
Communications And Radar
Accession Number
93N29603
Funding Number(s)
PROJECT: RTOP 314-40-31-30-26
PROJECT: RTOP 889-54-62-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19930020397Collected WorksThe Telecommunications and Data Acquisition Report
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