[IGSMAIL-7502] igs14_1958.atx: Update including reactivated Block IIA satellite SVN36/PRN04

[Arturo Villiger]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs14_wwww.atx) has been
updated. The new release is called 'igs14_1958.atx'. It contains the
following changes:

  1) According to NANU 2017070, Block IIA satellite SVN36 will resume
transmitting L-band utilizing PRN04 on approximately 20 July 2017.
Therefore, the following satellite has been added to igs14.atx (The
actual start date will be adapted with the next release.):

G04 (G036)

NANU message 2017070:

    NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2017070 NANU TYPE: GENERAL

    *** GENERAL MESSAGE TO ALL GPS USERS *** On approximately 20 Jul
    2017 SVN36 will resume transmitting L-band utilizing PRN04. At
    L-band activation, SVN36/PRN04 will be unusable until further
    notice. Additionally, no broadcast almanacs will include SVN36/PRN04
    until further notice.

    *** GENERAL MESSAGE TO ALL GPS USERS ***

https://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2017070


2) According to CODE, G038 stopped signal transmission on 14 July
2017. Therefore, a decommission date for the following satellite has
been added:

G04 (G038): 14 July 2017 (23:59:59.9999999)

additionally, the starting time has been changed according to CODE
from 18 May 2017 to 19 May 2017.

3) One robot calibration provided by San Jose Technology, Inc. has been added:
SJTTL111        NONE


  The updated antenna correction model is available at
ftp://ftp.igs.org/pub/station/general/igs14_1958.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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