Mon 5:30 PM
Subject: NOAA-12, Spacecraft Clock Update Follow Up, 6 June 2003 - Issued: 9 June 2003; 2130 UTC
Clock Drift Error Correction Follow Up
Date/Time(UTC) Message Issued:
9 June 2003, 2130 UTC
All products/Improved timing
Date/Time(UTC) of Initial Implementation:
6 June 2003, Time 1145 UTC
Details/Specifics of Change:
SOCC reported the following after the NOAA-12 clock update:
The NOAA-12 clock update was done real time on REV# 62659. Time of the
uplink command was 157/11:45:24UT. Clock update value was +1250
milliseconds. Clock errors observed were:
Before update -1105 msec.
After update -355 msec.
Net change in clock error was only +750 msec. The remaining 500 msec. was
removed after the next 24 hr. ETCUP from the spacecraft stored command
table just after the change of Julian day (158/00:00:05). Clock updates
often happen this way when the ETCUP is sent from the ground.
Contact Person(s) Name/Email/Phone Number for Questions:
Emily.Harrod@noaa.gov/301-457-5247 ext. 117
Cecil.Paris@noaa.gov/301-457-5247 ext. 129
Web site(s) that contain other relevant information (where applicable):
http://noaasis.noaa.gov/NOAASIS/ml/gateway.html (under "Satellite ...
http://www.osdpd.noaa.gov/PSB/PPP/PPP.html - History of level 1B
http://www.ssd.noaa.gov/PS/SATS/messages.html - All user notices
http://www.oso.noaa.gov/poesstatus/ - SOCC polar satellites status
http://www.oso.noaa.gov/daily-news/index.htm - SOCC morning reports