DocumentCode
1157210
Title
Observability, ensemble averaging and GPS time
Author
Chaffee, James W.
Author_Institution
Sci. Applications Int. Corp., San Diego, CA, USA
Volume
28
Issue
1
fYear
1992
fDate
1/1/1992 12:00:00 AM
Firstpage
224
Lastpage
240
Abstract
Obtaining time from an ensemble of clocks with a Kalman filter when the system is not observable is examined. Particular attention is given to the Global Positioning System (GPS) master control station (MCS) Kalman filter and the ramifications of estimating ensemble time under conditions of unobservability are explored. The effect of one proposed workaround to problems caused by unobservability is addressed
Keywords
Kalman filters; clocks; observability; radionavigation; satellite relay systems; signal processing; time measurement; GPS time; Global Positioning System; Kalman filter; ensemble averaging; ensemble time; master clock; master control station; observability; unobservability; Algorithm design and analysis; Clocks; Control systems; Covariance matrix; Differential equations; Global Positioning System; Laplace equations; Observability; State estimation; Transfer functions;
fLanguage
English
Journal_Title
Aerospace and Electronic Systems, IEEE Transactions on
Publisher
ieee
ISSN
0018-9251
Type
jour
DOI
10.1109/7.135448
Filename
135448
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