[IGSMAIL-6843] igs08_1769.atx: Update including reactivated Block IIA satellite SVN27/PRN30

[Ralf Schmid]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1769.atx'. It contains the 
following changes:

1) According to NANU 2013074, Block IIA satellite SVN27 resumed 
transmitting L-band utilizing PRN30 on 3 Dec 2013. Therefore, the 
following satellite has been added to igs08.atx:

G30 (G027)

Source:
> NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2013074 NANU TYPE: GENERAL
> *** GENERAL MESSAGE TO ALL GPS USERS ***
> ON APPROXIMATELY 3 DEC 2013 SVN27 WILL RESUME TRANSMITTING L-BAND UTILIZING PRN30. AT L-BAND ACTIVATION, SVN27/PRN30 WILL BE UNUSABLE UNTIL FURTHER NOTICE. ADDITIONALLY, NO BROADCAST ALMANACS WILL INCLUDE SVN27/PRN30 UNTIL FURTHER NOTICE.
http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2013074

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

G30 (G037): 7 October 2013


The updated antenna correction model is available at
ftp://igs.org/pub/station/general/igs08_1769.atx
or
ftp://igs.org/pub/station/general/igs08.atx

Thanks to Richard Langley and Stefan Schaer for their help!

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