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Principles of Timekeeping for the NEAR and STEREO SpacecraftThis paper discusses the details of the inherently different timekeeping systems for two interplanetary missions, the NEAR Shoemaker mission to orbit the near-Earth asteroid 433 Eros and the STEREO (Solar Terrestrial Relations Observatory) mission to study and characterize solar coronal mass ejections. It also reveals the surprising dichotomy between two major categories of spacecraft timekeeping systems with respect to the relationship between spacecraft clock resolution and accuracy. The paper is written in a tutorial style so that it can be easily used as a reference for designing or analyzing spacecraft timekeeping systems.
Document ID
20010111035
Acquisition Source
Goddard Space Flight Center
Document Type
Contractor Report (CR)
Authors
Cooper, Stanley B. (Johns Hopkins Univ. Laurel, MD United States)
Wolff, J.
Date Acquired
September 7, 2013
Publication Date
September 1, 2001
Subject Category
Spacecraft Instrumentation And Astrionics
Report/Patent Number
Rept-2001-03547-0
NASA/CR-2001-209988
NAS 1.26:209988
Funding Number(s)
CONTRACT_GRANT: NAS5-97271
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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