<font size=2 face="sans-serif">Hi Arturo et al.,</font>
<br>
<br><font size=2 face="sans-serif">We made a first attempt today to determine
the orbit of SVN74 using all available L1/L2 tracking data collected by
the IGS network over the last two days. The quality of the two daily orbit
solutions we generated seems pretty ok but there is a strong elevation
dependent signature in the carrier phase residuals that is obviously related
to the missing satellite antenna PCV information in igs14_2035.atx (see
green dots in "res.png").</font>
<br>
<br><font size=2 face="sans-serif">Solving for the phase center parameters
of SVN74 yields a mean z-offset of approx 1.93 m and a distinct PCV pattern
with a peak-to-peak difference of about 27 mm. Enclosed plot shows
the PCV estimates as a function of the nadir angle (see "pcv.png"
).</font>
<br>
<br><font size=2 face="sans-serif">Using the PCV corrections along with
the associated z-offset virtually eliminates the systematics seen in the
phase residuals (blue dots in "res.png"). The residual RMS goes
from 11.8 mm to 9.7 mm and the 3D orbit overlap error between both arcs
from 0.30 m to 0.08 m.</font>
<br>
<br><font size=2 face="sans-serif">Can send you the PCVs if you like to
include them into the next igs14.atx release.</font>
<br>
<br><font size=2 face="sans-serif">Cheers</font>
<br><font size=2 face="sans-serif">Florian</font>
<br><font size=2 face="sans-serif"><br>
</font>
<br><font size=2 face="sans-serif"><br>
<br>
Florian Dilssner<br>
Navigation Support Office, OPS-GN<br>
European Space Operations Centre ESOC<br>
Robert-Bosch-Str. 5, 64293 Darmstadt, Germany<br>
Phone: +49-6151-90-4125 Fax: +49-6151-90-2908</font>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">Arturo Villiger <arturo.villiger@aiub.unibe.ch></font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif"><igsmail@lists.igs.org></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">09.01.2019 17:58</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">[IGSMAIL-7724]
igs14_2035.atx: Update including new GPS III satellite G074</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Sent by:
</font><font size=1 face="sans-serif">"IGSMail"
<igsmail-bounces@lists.igs.org></font>
<br>
<hr noshade>
<br>
<br>
<br><tt><font size=2>Dear IGS colleagues,<br>
<br>
The absolute IGS antenna correction file (igs14_wwww.atx) has been<br>
updated. The new release is called 'igs14_2035.atx'. It contains the<br>
following changes:<br>
<br>
<br>
1) According to NANU 2019001 , BLOCK IIIA satellite SVN74 (2018-109A)<br>
launched on 23 December 2018 was put into operation using PRN 04.<br>
According to the Center for Orbit Determination in Europe (CODE), G074
<br>
became<br>
active on the 9 January 2019 (DOY 009).<br>
<br>
Nanu 2019001:<br>
<br>
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2019001 NANU TYPE: GENERAL<br>
<br>
*** GENERAL MESSAGE TO ALL GPS USERS *** GPS III SVN74 (PRN04) WAS <br>
LAUNCHED ON 23 DEC 2018 (2018 JDAY 357) AT 1351 ZULU. THIS SATELLITE <br>
WILL UNDERGO EXTENSIVE ON-ORBIT CHECK OUT AND TESTING PRIOR TO BEING SET
<br>
HEALTHY.<br>
<br>
A USABINIT NANU WILL BE SENT WHEN THE SATELLITE IS SET ACTIVE TO SERVICE.<br>
<br>
</font></tt><a href="https://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2019001"><tt><font size=2>https://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2019001</font></tt></a><tt><font size=2><br>
<br>
The following PRELIMINARY phase center offset (PCO) values were assigned:<br>
<br>
PCO_X = 0.0 cm<br>
PCO_Y = 0.0 cm<br>
PCO_Z = 170.0 cm<br>
<br>
<br>
2) The following decommission date has been added:<br>
<br>
G04 (036): 02 January 2019<br>
<br>
<br>
The updated antenna correction model is available at<br>
</font></tt><a href=ftp://ftp.igs.org/pub/station/general/igs14_2035.atx><tt><font size=2>ftp://ftp.igs.org/pub/station/general/igs14_2035.atx</font></tt></a><tt><font size=2><br>
or<br>
</font></tt><a href=ftp://ftp.igs.org/pub/station/general/igs14.atx><tt><font size=2>ftp://ftp.igs.org/pub/station/general/igs14.atx</font></tt></a><tt><font size=2><br>
<br>
With best regards,<br>
Arturo Villiger<br>
on behalf of the IGS Antenna Working Group<br>
_______________________________________________<br>
IGSMail mailing list<br>
IGSMail@lists.igs.org<br>
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</font></tt>
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