[IGSMAIL-7242] igs08_1882.atx: Update including second GLONASS-K1 satellite

[Ralf Schmid]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1882.atx'. It contains the 
following changes:

1) According to the Information Analytical Centre (IAC), the second 
GLONASS-K1 satellite (GLONASS-K1-2, COSPAR ID 2014-075A, GLONASS no. 
702K) started signal transmission in almanac slot 17. Therefore, the 
following satellite has been added to igs08.atx (with a preliminary 
designation):

R17 (R802)

The following PRELIMINARY phase center offset (PCO) values were assigned 
(the z-PCO being the R801 value rounded to 5 cm):

PCO_X =   0.0 cm
PCO_Y =   0.0 cm
PCO_Z = 205.0 cm

source:
> According to GLONASS System Control Centre, the SC Glonass-K #702 (orbital slot 9) will be under check by the Satellite Prime Contractor from 28.01.2016г. 14:00(MT) по 20.02.2016г. 14:00(MT), in almanac SC Glonass-K #702 is assigned number 17
https://www.glonass-iac.ru/en/content/news/?ELEMENT_ID=1539

2) According to the Center for Orbit Determination in Europe (CODE), 
GLONASS-K1-2 already was active in almanac slot 27 before. Therefore, 
the same preliminary PCO values were assigned to

R27 (R802)

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

R17 (R714): 26 January 2016


The updated antenna correction model is available at
ftp://ftp.igs.org/pub/station/general/igs08_1882.atx
or
ftp://ftp.igs.org/pub/station/general/igs08.atx

An additional version without the MGEX extension will follow later today:
ftp://ftp.igs.org/pub/station/general/igs08_1882_woMGEX.atx
The release of parallel file versions without information on the new 
GNSS will probably be stopped after the upcoming IGS Workshop in Sydney.

In Sydney, the IGS will also decide on the future naming of GLONASS 
satellites, as the GLONASS numbers used by the Russian authorities (7nn) 
are no longer unique.

Thanks to Richard Langley for his help!

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