[IGSMAIL-7227] igs08_1879.atx: Update including GALILEO-2 satellites E208 and E209

[Ralf Schmid]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1879.atx'. It contains the 
following changes:

1) The two GALILEO-2 satellites launched on 17 December 2015 have been 
added:

E08 (E208)
E09 (E209)

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

> Orbital and Technical Parameters
http://www.gsc-europa.eu/system-status/orbital-and-technical-parameters

NAGU message 2015021:
> NOTICE ADVISORY TO GALILEO USERS (NAGU) 2015021
> DATE GENERATED (UTC):2015-12-28 10:30
>
> NAGU TYPE: GENERAL
> NAGU NUMBER: 2015021
> NAGU SUBJECT: LAUNCH OF GSAT0208 AND GSAT0209
> NAGU REFERENCED TO: N/A
> START DATE EVENT (UTC): 2015-12-17 11:51
> END DATE EVENT (UTC): N/A
> SATELLITE AFFECTED: GSAT0208, GSAT0209
>
> EVENT DESCRIPTION: GALILEO SATELLITES GSAT0208 (SV_ID 08) AND GSAT0209 (SV_ID 09) WERE LAUNCHED ON 2015-12-17 AT 11:51 UTC.  GSAT0208 AND GSAT0209 ARE PLANNED TO BE POSITIONED IN SLOTS C07 AND C02 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-2015021

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

G04 (G034): 9 November 2015

Although officially removed from the GPS constellation on 3 November 
2015, Block IIA satellite SVN34/PRN04 didn't stop signal transmission 
before 9 November 2015 (DOY 313) according to the IGS tracking 
statistics provided by CODE 
(ftp://ftp.unibe.ch/aiub/igsdata/odata_gnss_day.txt).

NANU message 2015091:
> NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2015091
> SUBJ: SVN34 (PRN04) DECOMMISSIONING JDAY 307/2209
> 1. NANU TYPE: DECOM
> NANU NUMBER: 2015091
> NANU DTG: 032216Z NOV 2015
> REFERENCE NANU: 2015089
> REF NANU DTG: 282019Z OCT 2015
> SVN: 34
> PRN: 04
> UNUSABLE START JDAY: 306
> UNUSABLE START TIME ZULU: 2222
> UNUSABLE START CALENDAR DATE: 02 NOV 2015
> DECOMMISSIONING JDAY: 307
> DECOMMISSIONING TIME ZULU: 2209
> DECOMMISSIONING CALENDAR DATE: 03 NOV 2015
>
> 2. CONDITION: GPS SATELLITE SVN34 (PRN04) WAS UNUSABLE AS OF JDAY 306 (02 NOV 2015)
> AND REMOVED FROM THE GPS CONSTELLATION ON JDAY 307 (03 NOV 2015).
http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2015091

3) One robot calibration provided by Tallysman Wireless Inc. has been added:

TWIVP6000       NONE


The updated antenna correction model is available at
ftp://ftp.igs.org/pub/station/general/igs08_1879.atx
or
ftp://ftp.igs.org/pub/station/general/igs08.atx

Those who don't cope with the MGEX extension can use the following model 
instead:
ftp://ftp.igs.org/pub/station/general/igs08_1879_woMGEX.atx

Shortly before the end of the year, a paper on the generation of 
igs08.atx could be published:
Schmid Ralf, Dach Rolf, Collilieux Xavier, Jaeggi Adrian, Schmitz 
Martin, Dilssner Florian (2015) Absolute IGS antenna phase center model 
igs08.atx: status and potential improvements. Journal of Geodesy, doi 
10.1007/s00190-015-0876-3
http://doi.org/10.1007/s00190-015-0876-3
Sorry for the delay of that paper!

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