[IGSMAIL-2965]: NPL GPS time monitoring service
Jon Clarke
jon.clarke at npl.co.uk
Wed Aug 2 02:34:54 PDT 2000
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IGS Electronic Mail 02 Aug 09:42:39 PDT 2000 Message Number 2965
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Author: Jon Clarke
Subject: NPL GPS time monitoring service
Dear Colleagues,
The National Physical Laboratory has started monitoring the timing of
the GPS constellation, and publishing the results. These are available
at:
http://www.npl.co.uk/npl/ctm/gps_bulletin.html .
This is primarily to aid UK stand-alone users of GPS time in obtaining
traceability from their receiver to the UK national time standard,
UTC(NPL), and to provide independent integrity monitoring of GPS time.
This service is still under development, and is expected to expand over
the coming months. Currently NPL reports a single daily mean value for
UTC(NPL) - GPS time via multi-channel single-frequency C/A code
measurements, and reports any anomalous satellite measurements.
Thanks go to our colleagues at USNO who have provided useful
information.
I would welcome any comments on this service.
Regards,
Jon Clarke
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Mr Jon Clarke Time and Frequency Section,
jon.clarke at npl.co.uk Centre for Electromagnetic and Time Metrology,
tel: +44 (0) 20 8943 6548 National Physical Laboratory,
fax: +44 (0) 20 8943 6529 Queens Road, Teddington, TW11 0LW, U.K.
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