[IGSMAIL-7268] igs08_1887.atx: Update including reactivated GLONASS-M satellite R736

[Ralf Schmid]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1887.atx'. It contains the 
following changes:

1) According to the Information Analytical Centre (IAC), GLONASS-M 
satellite R736 replaced GLONASS-M satellite R738 in almanac slot 16. 
Therefore, the following satellite has been added:

R16 (R736)

According to the Center for Orbit Determination in Europe (CODE), R736 
is already active since 9 March 2016 (DOY 69).

sources:
> |  736  | 2464 | 2/16 |  -1  | 02.09.2010 | 01.10.2010 |  unusable | 14.02.2016 |
https://www.glonass-iac.ru/en/CUSGLONASS/index.php

> 16.02.2016
> According to GLONASS System Control Centre SC Glonass-M #736 (orbital slot 9) will be set unusable from 17:09 16.02.16 (MT) till 17:22 09.03.16 (MT) for the works on moving SC to orbital slot 16
https://www.glonass-iac.ru/en/content/news/?ELEMENT_ID=1561

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

R16 (R738): 14 February 2016

NAGU message 012-160219:
> NOTICE ADVISORY TO GLONASS USERS (NAGU) 012-160219
> SUBJ: 16/-1 (738) UNDER CHECK BY THE SPC SINCE 14.02/1045 MT
> 1.CONDITION: 16/-1 (738) UNDER CHECK BY THE SPC
>  SINCE 14.02/1045 MT (UTC+0300)
https://www.glonass-iac.ru/en/CUSGLONASS/index.php

3) One robot calibration provided by Trimble Navigation Ltd. has been added:

TRMR2           NONE


The updated antenna correction model is available at
ftp://ftp.igs.org/pub/station/general/igs08_1887.atx
or
ftp://ftp.igs.org/pub/station/general/igs08.atx

Many thanks to Richard Langley and Stefan Schaer for their help!

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