[IGSMAIL-7044] igs08_1830.atx: Update including reactivated Block IIA satellite SVN32/PRN26

[Ralf Schmid]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1830.atx'. It contains the 
following changes:

1) According to NANU 2015007, Block IIA satellite SVN32 will resume 
transmitting L-band utilizing PRN26 on approximately 5 February 2015. 
Therefore, the following satellite has been added to igs08.atx:

G26 (G032)

Source:
> NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2015007 NANU TYPE: GENERAL
> *** GENERAL MESSAGE TO ALL GPS USERS ***
> ON APPROXIMATELY 05 FEB 2015 SVN32 WILL RESUME TRANSMITTING L-BAND UTILIZING PRN26. AT L-BAND ACTIVATION, SVN32/PRN26 WILL BE UNUSABLE UNTIL FURTHER NOTICE. ADDITIONALLY, NO BROADCAST ALMANACS WILL INCLUDE SVN32/PRN26 UNTIL FURTHER NOTICE.
http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2015007

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

G26 (G026): 5 January 2015

Source:
> NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2015005
> SUBJ: SVN26 (PRN26) DECOMMISSIONING JDAY 006/2200
...
> 2. CONDITION: GPS SATELLITE SVN26 (PRN26) WAS UNUSABLE AS OF JDAY 005 (05 JAN 2015)
> AND REMOVED FROM THE GPS CONSTELLATION ON JDAY 006 (06 JAN 2015).
http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2015005

3) One robot calibration provided by TI Asahi Co. was added:

TIAPENG3100R2   NONE


The updated antenna correction model is available at
ftp://ftp.igs.org/pub/station/general/igs08_1830.atx
or
ftp://ftp.igs.org/pub/station/general/igs08.atx

Thanks to Richard Langley for his help!

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