[IGSMAIL-7314] igs08_1900.atx: Update including GALILEO-2 satellites E210 and E211

[Ralf Schmid]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1900.atx'. It contains the 
following changes:

1) The two GALILEO-2 satellites launched on 24 May 2016 have been added:

E01 (E210)
E02 (E211)

The following conventional phase center offset (PCO) values were assigned:

PCO_X =  15.0 cm
PCO_Y =   0.0 cm
PCO_Z = 100.0 cm

NAGU message 2016011:
> NOTICE ADVISORY TO GALILEO USERS (NAGU) 2016011
> DATE GENERATED (UTC): 2016-06-01 06:20
>
> NAGU TYPE: GENERAL
> NAGU NUMBER: 2016011
> NAGU SUBJECT: LAUNCH OF GSAT0210 AND GSAT0211
> NAGU REFERENCED TO: N/A
> START DATE EVENT (UTC): 2016-05-24 08:48
> END DATE EVENT (UTC): N/A
> SATELLITE AFFECTED: GSAT0210, GSAT0211
>
> EVENT DESCRIPTION: GALILEO SATELLITES GSAT0210 (SV_ID 01) AND GSAT0211 (SV_ID 02) WERE LAUNCHED ON 2016-05-24 AT 08:48 UTC.  GSAT0210 AND GSAT0211 ARE PLANNED TO BE POSITIONED IN SLOTS A02 AND A06 OF THE CONSTELLATION.  USERS WILL BE ADVISED OF AVAILABILITY OF SIGNALS FOLLOWING COMPLETION OF COMMISSIONING ACTIVITIES.
http://www.gsc-europa.eu/notice-advisory-to-galileo-users-nagu-2016011

More information on the Galileo constellation can be found at
http://mgex.igs.org/IGS_MGEX_Status_GAL.html

2) One additional robot calibration:

SOKSA500        NONE

According to Topcon, SOKSA500 and TPSG5_A1 are identical in 
construction. Therefore, calibration values were copied from "TPSG5_A1 
       NONE".


The updated antenna correction model is available at
ftp://ftp.igs.org/pub/station/general/igs08_1900.atx
or
ftp://ftp.igs.org/pub/station/general/igs08.atx

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