[IGSMAIL-5775]: igs05_1480.atx - New release of the absolute IGS antenna correction file

[Ralf Schmid <schmid @ bv.tu-muenchen.de>]

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IGS Electronic Mail      19 May 09:15:06 PDT 2008      Message Number 5775
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Author: Ralf Schmid


Dear IGS colleagues!

The absolute IGS antenna correction file (igs05_wwww.atx) has been 
updated. The new release is called 'igs05_1480.atx'. It contains 11 
additional robot calibrations from Geo++ (http://gnpcvdb.geopp.de/), 
several of them replacing converted field calibration results used so 
far. Such a replacement of values is only possible, as the respective 
antenna types are currently NOT in use within the IGS network and the 
EUREF Permanent GNSS Network EPN. However, the robot calibrations are 
important for the ongoing reprocessing efforts, especially as regards 
the EPN.

Users of the respective antenna types outside the IGS are warned that 
the change of the phase center corrections may cause considerable jumps 
in time series of station coordinates. The following antenna types are 
affected:

New robot calibrations:

TPSCR.G3        TPSH
TPSCR3_GGD      OLGA
TPSCR3_GGD      PFAN
TRM29659.00     OLGA
TRM29659.00     SNOW
TRM57971.00     NONE

Robot calibrations replacing converted field calibration:

LEIAT302-GP     NONE
LEIAT303        NONE
TRM23903.00     NONE
TRM33429.20+GP  TCWD
TRM55971.00     TZGD

The update of the antenna correction model is available at
ftp://igscb.jpl.nasa.gov/pub/station/general/igs05_1480.atx
or
ftp://igscb.jpl.nasa.gov/pub/station/general/igs05.atx

With best regards,

Ralf Schmid on behalf of the IGS Antenna Working Group
http://igscb.jpl.nasa.gov/projects/antenna/



Details:

1) LEIAT302-GP     NONE
calibration replacement; never used within the IGS network; affected EPN 
station: GSR1 (antenna replaced in the meantime)

2) LEIAT303        NONE
calibration replacement; never used within the IGS network; affected EPN 
stations: CASC (antenna replaced in the meantime), MANS (no longer active)

3) TPSCR.G3        TPSH
new calibration; used at IGS and EPN station REYK; EPN uses individual 
calibration

4) TPSCR3_GGD      OLGA
new calibration; used at future EPN stations TRF2 and SBG2

5) TPSCR3_GGD      PFAN
new calibration; used at future EPN station PFA2

6) TRM23903.00     NONE
calibration replacement; never used within the IGS network; affected EPN 
stations: HOBU, TRDS, VARS (antennas replaced in the meantime)

7) TRM29659.00     OLGA
new calibration; used at future EPN station HFL2

8) TRM29659.00     SNOW
new calibration; might cause consistency problems, if the calibration 
for the antenna without the radome was used so far; never used within 
the IGS network; affected EPN stations: BORK (no longer active), HOBU 
(antenna replaced in the meantime)

9) TRM33429.20+GP  TCWD
calibration replacement; considerable difference between the robot 
calibration and the converted field calibration (about 1 cm in zenith 
direction for L1); the phase center corrections do not refer to the 
antenna reference point given in antenna.gra (BPA = bottom of 
preamplifier), but to the bottom of the additional 'dome groundplane'; 
update of antenna.gra will follow; never used within the IGS network; 
affected EPN station: BUTE (antenna replaced in the meantime)

10) TRM55971.00     TZGD
calibration replacement; affected IGS stations: DUBR, OSJE (observation 
data was not distributed); affected EPN stations: BUTE, KLOP, ZYWI 
(individual calibrations used), DUBR, OSJE (observation data was not 
distributed), MOP2 (individual calibration underway?)

11) TRM57971.00     NONE
new calibration