[IGSMAIL-6650] igs08_1706.atx: Upcoming z-offset update for seven GPS/GLONASS satellites

[Robert Khachikyan]

Dear IGS colleagues!

In preparation for the second IGS reprocessing campaign "repro2", the 
absolute IGS antenna correction file (igs08_wwww.atx) has been updated. 
The new release is called 'igs08_1706.atx' and should be used starting 
with GPS week 1706 (16 September 2012). It contains the following changes:

1) The z-offsets of two GPS and five GLONASS satellites have been 
changed using estimates provided by Paul Rebischung (IGN) based on 
operational SINEX files of six ACs. Five of the satellites were only 
launched after the release of igs08.atx, the z-offset values available 
for the first Block IIF satellite G062 (launched in May 2010) and for 
the first GLONASS-K1 satellite R801 (launched in February 2011) were 
only based on few data:

G062/G25: 1.6632 m --> 1.5973 m
G063/G01: 1.6500 m --> 1.5613 m
R742/R04: 2.4500 m --> 2.3811 m
R744/R03: 2.4500 m --> 2.5631 m
R745/R07: 2.4500 m --> 2.6372 m
R746/R17: 2.4500 m --> 2.7436 m
R801/R03: 1.7500 m --> 2.0668 m
R801/R04: 1.7500 m --> 2.0668 m
R801/R26: 1.7500 m --> 2.0668 m

More details can be found in the following table (all values in [m]):

| Sat. | AC  | # wk | w.mean | w.rms  |*AC mean*| igs08  | d.igs08 |
|------|-----|------|--------|--------|---------|--------|---------|
| G062 | cod |  102 | 1.5808 | 0.0221 | 1.5973  | 1.6632 | -0.0659 |
| G062 | emr |   81 | 1.6190 | 0.0258 |         |        |         |
| G062 | esa |  102 | 1.5901 | 0.0240 |         |        |         |
| G062 | gfz |   99 | 1.5986 | 0.0303 |         |        |         |
| G062 | mit |   98 | 1.5875 | 0.0277 |         |        |         |
| G062 | ngs |   93 | 1.6078 | 0.0241 |         |        |         |
|------|-----|------|--------|--------|---------|--------|---------|
| G063 | cod |   54 | 1.5596 | 0.0344 | 1.5613  | 1.6500 | -0.0887 |
| G063 | emr |   43 | 1.5689 | 0.0208 |         |        |         |
| G063 | esa |   54 | 1.5520 | 0.0225 |         |        |         |
| G063 | gfz |   44 | 1.5477 | 0.0221 |         |        |         |
| G063 | mit |   51 | 1.5451 | 0.0251 |         |        |         |
| G063 | ngs |   38 | 1.5946 | 0.0177 |         |        |         |
|------|-----|------|--------|--------|---------|--------|---------|
| R742 | cod |   43 | 2.3805 | 0.0288 | 2.3811  | 2.4500 | -0.0690 |
| R742 | esa |   42 | 2.3816 | 0.0369 |         |        |         |
|------|-----|------|--------|--------|---------|--------|---------|
| R744 | cod |   36 | 2.5609 | 0.0322 | 2.5631  | 2.4500 | +0.1131 |
| R744 | esa |   36 | 2.5653 | 0.0437 |         |        |         |
|------|-----|------|--------|--------|---------|--------|---------|
| R745 | cod |   35 | 2.6413 | 0.0294 | 2.6372  | 2.4500 | +0.1872 |
| R745 | esa |   35 | 2.6330 | 0.0322 |         |        |         |
|------|-----|------|--------|--------|---------|--------|---------|
| R746 | cod |   34 | 2.7655 | 0.0322 | 2.7436  | 2.4500 | +0.2936 |
| R746 | esa |   33 | 2.7217 | 0.0327 |         |        |         |
|------|-----|------|--------|--------|---------|--------|---------|
| R801 | cod |   20 | 2.0908 | 0.0246 | 2.0668  | 1.7500 | +0.3168 |
| R801 | esa |   17 | 2.0427 | 0.0448 |         |        |         |
|------|-----|------|--------|--------|---------|--------|---------|

The corresponding time series can be found at
ftp://igs-rf.ensg.eu/pub/IGS08/new_z-PCOs or
ftp://igs-rf.ign.fr/pub/IGS08/new_z-PCOs

All IGS results starting with GPS week 1706 will be based on the new 
z-offset values. Sorry for any inconvenience this may cause!

2) The start date of the reactivated Block IIR-M satellite G049/G24 was 
corrected:

8 August 2012 --> 9 August 2012

Compare [IGSMAIL-6644]: SVN49 reactivated
http://igscb.jpl.nasa.gov/pipermail/igsmail/2012/006636.html
In the meantime, this satellite already stopped transmissions again:
https://listserv.unb.ca/cgi-bin/wa?A2=CANSPACE;c52129cb.1208


Although not valid before 16 September 2012, the updated antenna 
correction model is already available at
ftp://igs.org/pub/station/general/igs08_1706.atx

Many thanks to Paul Rebischung for all his efforts!

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