[IGSMAIL-6409] igs08_1639.atx: Update including reactivated SVN35/PRN01

[Robert Khachikyan]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been
updated. The new release is called 'igs08_1639.atx'. It contains the
following changes:

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

G01 (G049): 6 May 2011

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2011039 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***
GPS satellite SVN49 (PRN01) was decommissioned from active service on
JDay 126 (06 May 2011). PRN01 is available for future satellite service.
http://cgls.uscg.mil/pipermail/nanu/2011-May/001307.html

2) According to 'NANU 2011043' the following satellite has been added:

G01 (G035)

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2011043 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS *** On approximately 1 June 2011,
SVN35 will resume transmitting L-band utilizing PRN01.  At L-band
activation, SVN35/PRN01 will be unusable until further notice.
Additionally, no broadcast almanacs will include SVN35/PRN01.  Future
NANUs will inform users of any changes to the above-stated status.
http://cgls.uscg.mil/pipermail/nanu/2011-May/001314.html

The updated antenna correction model is available at
ftp://igs.org/pub/station/general/igs08_1639.atx
or
ftp://igs.org/pub/station/general/igs08.atx

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