[IGSMAIL-7545] igs14_1973.atx: Update including new GLONASS-M satellite 852

[Arturo Villiger]

Dear IGS colleagues,

The absolute IGS antenna correction file (igs14_wwww.atx) has been
updated. The new release is called 'igs14_1973.atx'. It contains
the following changes:

1) According to the Information Analytical Centre (IAC), GLONASS-M satellite
R852 (2017-055A) launched on 22 September 2017 was put into operation in 
slot 14.
According to the Center for Orbit Determination in Europe (CODE), R852 
became
active on the 10 October 2017 (DOY 283). Note that the SVN number was 
assigned according
to an IGS  Workshop recommendation (see IGSMAIL #7252) to 852 (changed 
from 752 to 852).

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

PCO_X = -54.5 cm
PCO_Y = 0.0 cm
PCO_Z = 245.0 cm


NAGU message 014-170922:

014-170922
NOTICE ADVISORY TO GLONASS USERS (NAGU) 014-170922
SUBJ: FORECAST PUT INTO OPERATION 14/-7 (752)  ON 20.10
1.CONDITION: 14/-7 (752) IS SCHEDULED TO BE OPERATION ON 20.10
AFTER MAINTENANCE
2.USERS ARE REMINDED TO UPDATE ALMANACS IF NECESSARY

https://www.glonass-iac.ru/en/CUSGLONASS/index.php

2) Analyses performed at CODE have shown that R801 was switched from R14 
to R26 on the 06. October 2017:

   R26 (801): 06 October 2017

3) The following decommission dates have been added:

  R14 (R801):  05 October 2017

4) Two additional antenna type calibration has been added that was 
performed by Geo++ GmbH:
     - One robot calibration provided by Harxon Corporation:
       HXCCGX601A      HXCS

     - One robot calibration provided by Septentrio:
       SEPALTUS_NR3    NONE


The updated antenna correction model is available at
ftp://ftp.igs.org/pub/station/general/igs14_1973.atx
or
ftp://ftp.igs.org/pub/station/general/igs14.atx


With best regards,
Arturo Villiger
on behalf of the IGS Antenna Working Group

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