Topic:
Clock Drift Correction
Date/Time(UTC) Message Issued:
6 December 2002; 1945 UTC
Satellite(s) Involved:
NOAA-17
Instrument(s) Involved:
All
Product(s) Involved/Affected:
All data users
Date/Time(UTC) of Initial Implementation:
10 December 2002 23:59 UTC
Details/Specifics of Change:
The Satellite Operations Control Center (SOCC) has issued the following
notice: "NOAA-17's Elapsed Time Clock (ETC) has a small positive offset
of
less than 100 milliseconds, due to a small positive drift of about
one
millisecond per day. It is necessary to subtract 100 milliseconds from
ETC
to eliminate the clock offset. This update is scheduled for December
lOth,
2002 via SCT at 23:59:00Z for the control On-Board Processor (OBP)."
The Information Processing Division (IPD) will update our clock drift
file
information on the web site to reflect this change. Please remember
that
we are not performing clock drift corrections within the level 1B
processing. Hence, only those changes made by SOCC will be seen in
the
spacecraft instrument data. If you are performing your own clock drift
adjustments, please make note of this update and adjust accordingly.
Contact Person(s) Name/Email/Phone Number for Questions:
Emily.Harrod@noaa.gov/301-457-5247 ext. 117 or
Cecil.Paris@noaa.gov/301-457-5247 ext. 129
Web site(s) that contain other relevant information (where applicable):
http://www.oso.noaa.gov/daily-news/index.htm - SOCC morning reports
http://www.osdpd.noaa.gov/PSB/PPP/PPP.html - History of level 1B
notices
http://www.ssd.noaa.gov/PS/SATS/messages.html - All user notices