Sam Wormley
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 Posted: Sat Oct 25, 2008 3:29 am Post subject: SVN37 [PRN01] Coming Back to Life; GLONASS Retires Two |
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SVN37 Coming Back to Life; GLONASS Retires Two
http://sidt.gpsworld.com/gpssidt/content/printContentPopup.jsp?id=561081
Oct 24, 2008
GPS World
GPS satellite SVN37>s L-band transmitters are active once again and using PRN01; although
it is set to unhealthy for the time being, some International GNSS Service (IGS)
monitoring network stations are able to track the satellite.
SVN37, with PRN07, was decommissioned from active service on December 20, 2007, presumably
to make way for future, newer satellites in the GPS constellation; it only has one healthy
clock. It>s L-band transmitters remained active until January 14, at which time it was
stored in orbit under Launch and Early Orbit, Anomaly Resolution, and Disposal (LADO).
However, U.S. Air Force GPS administrators announced through a Notice Advisory to Navstar
Users (NANU) earlier this month that the current satellite to utilize PRN01 until now,
SVN32, had its L-band transmissions discontinued, which freed up PRN01; The Air Force said
earlier this year that it was evaluating SVN32 for long-term storage.
An ensuing NANU said that SVN37 would shortly resume transmitting L-band code utilizing
PRN01, although it would continue to be set to unhealthy, initially, and would not be
included in broadcast almanacs.
In other GNSS satellite news, according to a notice from Russia>s GLONASS administrators
two GLONASS satellites originally launched in December 2004 have been officially retired.
GLONASS 796, in slot 1, had been set unhealthy since May 4; GLONASS 797, in slot 8, had
been set unhealthy since June 16.
That leaves 14 healthy GLONASS satellites, with three new satellites launched September 24
that should come online within a few weeks as they settle into their final orbits. Three
more GLONASS satellites are slated for launch in December. |
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