Message-ID: <499550B8.7040704@aiub.unibe.ch> Date: Fri, 13 Feb 2009 11:51:36 +0100 From: Stefan Schaer User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) To: igsmail Subject: [IGSMAIL-5898]: Three new GLONASS-M satellites active Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 13 Feb 02:51:49 PST 2009 Message Number 5898 ****************************************************************************** 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