[IGSMAIL-7733] igs14_2038: Update including updated PCO/PV for GPS III satellite G074

[Arturo Villiger]

Dear IGS colleagues,

The absolute IGS antenna correction file (igs14_wwww.atx) has been
updated. The new release is called 'igs14_2038.atx'. It contains the
following changes:

1) Updated PCO/PV for BLOCK IIIA satellite SVN74 (2018-109A):
The new PCO values are provided by the Aerospace Corporation are:

       X         Y         Z
L1: 

 3.88    -18.00   1232.40 mm
L2:  3.10    -16.20    740.50 mm
L5:  3.20    -16.30    778.70 mm

Using tracking data of the new satellite, ESA and CODE have estimated a 
preliminary set of PCO and PV for that satellite. The estimates for the 
Z-components were remarkably close the PCO provided by the Aerospace 
Corporation with 1.99m for the L1/L2 ionosphere free linear combination 
(ESA: 1.93m, CODE:  1.97m). In addition, ESA and CODE have estimated PV 
values which show a good agreement. The estimations from ESA, CODE, and 
the mean values (used as the new PV values in the IGS ANTEX file) are 
shown in the attached plot.
Please note that the estimations go up to a nadir angle of 14 degrees. 
The nadir range has been extended to 17 degrees using the last PV value 
(at 14 degree).
Many thanks to Florian and Oliver for their efforts in this matter!


2) One additional antenna type calibration has been added that were 
performed by Geo++ GmbH:

      - One robot calibration provided by  Hi-Target Surveying 
Instrument Co., Ltd  has been added:
        HITAT45101CP    HITZ

The updated antenna correction model is available at

ftp://ftp.igs.org/pub/station/general/igs14_2038.atx

or

ftp://ftp.igs.org/pub/station/general/igs14.atx


With best regards,

Arturo

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