[IGSMAIL-6953] igs08_1804.atx: Update including Block IIF satellite G068 and GLONASS-M satellite R755

[Ralf Schmid]

Dear IGS colleagues!

The absolute IGS antenna correction file (igs08_wwww.atx) has been 
updated. The new release is called 'igs08_1804.atx'. It contains the 
following changes:

1) The seventh Block IIF satellite launched on 2 August 2014 was added:

G09 (G068)

The following PRELIMINARY phase center offset (PCO) values were assigned:

PCO_X =  39.4 cm
PCO_Y =   0.0 cm
PCO_Z = 160.0 cm

NANU message 2014062:
> NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014062
> SUBJ: SVN68 (PRN09) LAUNCH JDAY 214
> 1. NANU TYPE: LAUNCH
> NANU NUMBER: 2014062
> NANU DTG: 020344Z AUG 2014
> SVN: 68
> PRN: 09
> LAUNCH JDAY: 214
> LAUNCH TIME ZULU: 0323
>
> 2. GPS SATELLITE SVN68 (PRN09) WAS LAUNCHED ON JDAY 214.
> A USABINIT NANU WILL BE SENT WHEN THE SATELLITE IS SET ACTIVE TO SERVICE.
http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2014062

spaceflightnow.com: Atlas 5 rocket deploys new GPS navigation satellite
http://spaceflightnow.com/atlas/av048/#.U99lbqZ8aCw

2) A GLONASS-M satellite launched on 14 June 2014 was added with a 
preliminary z-offset value of 245 cm:

R21 (R755)

NAGU message 060-140804:
> NOTICE ADVISORY TO GLONASS USERS (NAGU) 060-140804
> SUBJ: 21/04 (755) PUT INTO OPERATION 03.08/1143 MT
> 1.CONDITION: 21/04 (755) PUT INTO OPERATION 03.08/1143 MT (UTC+0300)
http://glonass-iac.ru/en/CUSGLONASS/index.php

3) Decommission dates for the following two satellites were added:

G09 (G039): 21 July 2014
R21 (R725): 3 August 2014

NAGU message 059-140804:
> NOTICE ADVISORY TO GLONASS USERS (NAGU) 059-140804
> SUBJ: 21/04 (725) UNUSABLE 01.08/1445 MT - UNFINISHED
> 1.CONDITION: 21/04 (725) UNUSABLE SINCE 01.08/1445
>  MT (UTC+0300) UNTIL FURTHER NOTICE DUE TO MAINTENANCE
http://glonass-iac.ru/en/CUSGLONASS/index.php

4) One robot calibration provided by Geo++ GmbH was added:

AERAT1675_120   SPKE

This antenna type is installed at the proposed EPN station YLDZ in Turkey.


The updated antenna correction model is available at
ftp://igs.org/pub/station/general/igs08_1804.atx
or
ftp://igs.org/pub/station/general/igs08.atx

The exact date of the switch from R725 to R755 is not clear yet and 
could be changed later on. According to the Information-Analytical 
Centre, R755 should already be active:
http://glonass-iac.ru/en/GLONASS/

Thanks to Richard Langley for his help!

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