[IGSMAIL-5898]: Three new GLONASS-M satellites active
Stefan Schaer
stefan.schaer at aiub.unibe.ch
Fri Feb 13 02:51:36 PST 2009
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IGS Electronic Mail 13 Feb 02:51:49 PST 2009 Message Number 5898
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Author: Stefan Schaer
Dear IGS colleagues,
We got confronted with first IGS tracking data of the three new
GLONASS-M satellites launched on 25 Dec 2008, namely:
R03 (727) on 11 Jan 2009 (day 011)
R02 (728) on 15 Jan 2009 (day 015)
R08 (729) on 03 Feb 2009 (day 034)
With these three new satellites, the GLONASS-M constellation now
consists of 19 satellites. The only remaining active GLONASS satellite
of the older generation is R04 (795).
The CODE GNSS orbit products include currently up to 50 satellites (31
GPS plus 19 GLONASS). G01 is no longer occupied (inactive since 07 Jan
2009); R06 (701) is marked unusable and relatively often inactive. Once
more, it should be emphasized that current data of R09 (722) is
considered useless and is therefore generally excluded from our
analysis.
ANOTHER MILESTONE REACHED: With 50 (or potentially 51) active GNSS
satellites, we reached the highest number of satellites we ever
considered at one time in the operational analysis at CODE.
IMPORTANT NOTE: There is still a number of IGS GNSS receivers which is
not yet ready for zero or negative GLONASS frequency channels. This is
an unacceptable situation, especially since already 8 (of 20) GLONASS
satellites transmit their signals on these frequency channels: R09
(-2), R11 (0), R13 (-2), R15 (0), R17 (-1), R18 (-3), R21 (-1), R22
(-3). See:
http://www.aiub.unibe.ch/download/igsdata/tracking_glonass.txt
See also IGS Mails 5650, 5668, 5695, 5824, 5854:
http://igscb.jpl.nasa.gov/mail/igsmail/2007/msg00130.html
http://igscb.jpl.nasa.gov/mail/igsmail/2007/msg00148.html
http://igscb.jpl.nasa.gov/mail/igsmail/2008/msg00017.html
http://igscb.jpl.nasa.gov/mail/igsmail/2008/msg00146.html
http://igscb.jpl.nasa.gov/mail/igsmail/2008/msg00176.html
List of GNSS receivers not (yet) ready for negative frequency channels:
GOPE ASHTECH Z18 0065
MAT1 ASHTECH Z18 0065 ZT16
MOBJ TPS LEGACY 2.3 APR,28,2004 P4
MTKA ASHTECH Z18 0065 ZT16
POUS TPS GB-1000 2.5 APR,07,2005 P1B1
SNEC TPS GB-1000 2.5 JUN,22,2005 P1
TIXJ TPS ODYSSEY_E 2.5 JUN,22,2005 P1
UNFE ASHTECH Z18 0065 ZT17
VESL TPS GB-1000 3.1 JUN,28,2007 P3
A corresponding list is regularly posted to:
http://www.aiub.unibe.ch/download/igsdata/tracking_glo_neg_freq_not_ready.txt
List of ASHTECH Z18 receivers unable to track GLONASS at all:
GOPE ASHTECH Z18 0065
MAT1 ASHTECH Z18 0065 ZT16
Best regards,
The CODE AC Team
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