[IGS-Equipment-Files] igs08_1657.atx: Update including latest GLONASS constellation changes

[Robert Khachikyan]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been
updated. The new release is called 'igs08_1657.atx'. The following
GLONASS constellation changes were considered:

> >  According to GLONASS System control center the SV Glonass-M No722 is scheduled to be transferred to the orbital reserve on the 13 October, 2011 at 01:00 (MSC). Frequency channel -7 (minus 7) will be assigned to SV Glonass No715 orbital slot No14 .
> >  During the works SV Glonass-M No715 will be unusable.
http://www.glonass-ianc.rsa.ru/en/content/news/?ELEMENT_ID=174

> >  GLONASS Constellation Status at 13.10.2011 based on both the almanac analysis and navigation messages received at 13:00 13.10.11 (UTC) in IAC
->  changes in almanac slots 3, 4 and 14

> >  3 	3 	-5 	701 	26.02.11 	  	  	7.5 	- 	- 21:15 12.10.11 	Flight Tests
> >  4 	1 	06 	742 	02.10.11 	  	  	0.4 	- 	- 03:07 10.10.11 	Commissioning Phase
> >  14 	2 	-7 	715 	25.12.06 	03.04.07 	  	57.6 	+ 	+ 13:10 13.10.11 	In operation
http://www.glonass-ianc.rsa.ru/en/GLONASS/

  >  GLONASS-K1 No. 701 (801) L1/L2 Transmissions Stop
https://listserv.unb.ca/cgi-bin/wa?A2=ind1110&L=CANSPACE&T=0&F=&S=&P=16417
ftp://ftp.unibe.ch/aiub/igsdata/odata_gnss_day.txt


In detail, the latest release of igs08.atx contains the following changes:

1) New file entries for the following satellites:

R715 (R14)
R742 (R04)
R801 (R03)

2) Decommission dates for the following satellites:

R715 (R03): 12 October 2011
R722 (R14): 12 October 2011
R801 (R04): 10 October 2011


The updated antenna correction model is available at
ftp://igs.org/pub/station/general/igs08_1657.atx
or
ftp://igs.org/pub/station/general/igs08.atx

Many thanks to Vladimir Mitrikas for his help!

With best regards,
Ralf Schmid and Robert Khachikyan
on behalf of the IGS Antenna Working Group