[IGSMAIL-6640] igs08_1700.atx: Update including reactivated Block IIR-M satellite SVN49/PRN24

[Robert Khachikyan]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1700.atx'. It contains the 
following changes:

1) According to NANU 2012049 BLOCK IIR-M satellite SVN49 "will resume 
transmitting L-band on approximately 08 AUG 2012". Therefore, the 
following satellite has been added to igs08.atx:

G24 (G049)

Source:
> NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012049 NANU TYPE: GENERAL
> *** GENERAL MESSAGE TO ALL GPS USERS ***
> On approximately 08 AUG 2012 SVN49 will resume transmitting L-band 
> utilizing PRN24. At L-band activation, SVN49/PRN24 will be unusable 
> until further notice.  Additionally, no broadcast almanacs will 
> include SVN49/PRN24. Future NANUs will inform users of any changes to 
> the above-stated status.
http://celestrak.com/GPS/NANU/2012/nanu.2012049.txt

2) A decommission date for the following satellite has been added:

G24 (G037): 30 May 2012


The updated antenna correction model is available at
ftp://igs.org/pub/station/general/igs08_1700.atx
or
ftp://igs.org/pub/station/general/igs08.atx

Many thanks to Richard Langley for his help!

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