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[IGSMAIL-5447]: Proposed IGS05 Realization



******************************************************************************
IGS Electronic Mail      19 Oct 08:10:39 PDT 2006      Message Number 5447
******************************************************************************

Author:  R. Ferland

Dear colleagues,

	You will find below a review of the IGS05 proposed reference frame
realization, along with some comparisons and analysis of its effects on
the apparent geocenter, ERP's and the scale.

	See IGSMAIL 5438 by Gerd Gendt for the proposed timeline:
http://igscb.jpl.nasa.gov/mail/igsmail/2006/msg00161.html

	I have updated the proposed realization "IGS05.snx".
For those of you who may need it, I have also posted a corresponding
"IGT05.snx" which uses the relative antenna phase center offsets.
Those can be found at:
ftp	macs.geod.nrcan.gc.ca
cd	/pub/requests/sinex/IGS05

and should be made available soon at the igscb.

The proposed update includes:
	- 1) Reference Frame Stations review
	- 2) ITRF2000 to ITRF2005 update.
	- 3) Relative to absolute antenna phase calibration change

	Preliminary versions of the IGS realization of was provided last
spring (last one IGS05_060606.snx).
This latest release differs only slightly from the earlier one.
One version was presented at the last IGS workshop in Darmstadt in
May 2006 , where details of the changes were provided.
(see: http://nng.esoc.esa.de/ws2006/Ferland.pdf)
In summary, the proposed changes w.r.t IGb00 were:
	-89 stations were retained,
	-10 were removed and
	-50 were added
Total	139 stations was in the proposed realization.

Following the recent official release of ITRF2005,
(http://itrf.ensg.ign.fr/ITRF_solutions/2005/ITRF2005.php)
the proposed realization has been updated.

The station selection generally follows the criterions from:
     Kouba, J., J. Ray and M.M. Watkins, IGS Reference Frame Realization,
1998 IGS Analysis Center Workshop Proceedings, European Space Operations
Centre, Darmstadt, Germany.
and from the guidelines:
	Moore, A., IGS Site Guidelines, Jet Propulsion Laboratory, 2004.


1) Review of the proposed realization:
--------------------------------------

	The originally proposed network of 139 stations was reviewed.
The following stations may no longer be suitable for the IGS05 reference
frame realization. It is proposed to remove them:

BAKO:	Discontinuity introduced at 06:149:00000,
	Equipment Change.
BRMU:	Discontinuity introduced at 06:213:00000,
	Equipment Change/Cut-off angle change.
CORD:	Decommissioned.
KOUR:	Discontinuity introduced at 06:183:00000,
	Cause Unknown.
LHAS:	Discontinuity introduced at 06:209:45000,
	Antenna & receiver Change.
OUS2:	Discontinuity introduced at 06:239:79200,
	Radome removed.
RBAY:	Discontinuity introduced at 06:211:00000,
	Cause Unknown.

	This would reduce the originally proposed 139 stations network to
132 stations. The following stations performance is currently questionable:

ASC1:	Off since 06:056 due to equipment problems,
GOUG:	Data availability ???,
NICO:	No data since 06:166,
OHI2:	Recent Solutions are questionable.

It is proposed to leave them in, hoping that their status does improve.

	The following section first compares the currently proposed realization
with the previous one, dating back to last June. It is followed by the effect
of the alignment of the proposed IGS05 to ITF2005.

2)	IGS05:
--------------

2-1)	IGS05 - IGS05_060606.snx:
---------------------------------

	Since significant testing, has already taken place with the
"IGS05_060606.snx" and earlier proposed realizations, comparisons are first
made with the latest. The coordinates for all the proposed realizations were
extracted from ITRF2005 (and its preliminary release). The position differences
at the reference epoch (2000.0) between this proposed release and the previous
one are sub-mm for about half of the stations. Only 2 (CONZ and KOKB) have
horizontal positions exceeding 2mm, and 2 (CONZ and NOT1) have 3D position
exceeding 3mm; velocity differences are all sub-mm/y. The larger differences
at those two stations are likely caused by the ties with other techniques.
	The proposed realization relative to absolute receiver antenna phase
center corrections have also been updated using all the available test
solutions up to GPS week 1389. Results with data available up to April
were presented at the workshop.
( See: http://nng.esoc.esa.de/ws2006/ABSA4.pdf ) The inclusion of an additional
6 months of data affects the phase center corrections (N,E,H) components by
less than 2mm (RMS).

Although the vertical component of the correction is the most significant,
the 3D corrections were applied.
Those final corrections are:

 Code Pt Soln d  d. Lat  d. Lon  d. Hei
                   (mm)    (mm)    (mm)
 ALGO  A    7 D    -1.1    -0.4    16.5
 ALIC  A    1 D    -0.1     0.1    13.2
 ALRT  A    1 D    -1.6    -1.0   -12.8
 AMC2  A    4 D    -1.5    -2.1    11.0
 ARTU  A    3 D     1.4    -0.6    15.4
 ASC1  A    1 D    -1.3    -3.0     4.7
 ASPA  A    1 D    -2.0     1.4     4.1
 BAHR  A    1 D    -1.5    -0.6    15.5
 BILI  A    4 D     0.3     1.9    -2.5
 BJFS  A    1 D    -0.5     1.8    25.9
 BOR1  A    2 D    -0.4     0.4     4.6
 BRAZ  A    1 D    -2.8    -2.0    12.1
 BRUS  A    2 D     0.0     0.3     3.6
 CAGL  A    3 D     0.3     2.2     3.8
 CAS1  A    3 D    -3.3     1.3     6.5
 CEDU  A    1 D     0.1     0.5    18.9
 CHAT  A    1 D    -3.0     0.4    18.9
 CHPI  A    1 D    -2.5    -2.5    10.4
 CHUR  A    4 D     0.4    -1.7    13.7
 COCO  A    3 D    -1.3     2.2     8.4
 CONZ  A    2 D    -2.6    -1.5    11.3
 CRO1  A    1 D    -2.6    -0.5    18.9
 DAEJ  A    1 D    -0.1     2.6    16.4
 DARW  A    1 D    -0.4     0.7    12.6
 DAV1  A    1 D    -2.9     0.5     9.2
 DGAR  A    2 D    -0.9    -1.2     5.4
 DRAO  A    3 D    -1.4    -1.1    12.6
 DUBO  A    4 D     0.5    -2.1    19.9
 FAIR  A    6 D    -1.3     0.7    10.2
 FLIN  A    2 D     0.5    -1.8    12.1
 GLPS  A    1 D    -2.1    -0.6     7.9
 GLSV  A    1 D     0.2     3.0     5.1
 GODE  A    2 D    -1.3    -0.0    15.3
 GOLD  A    7 D    -3.1    -1.6     7.8
 GOUG  A    1 D    -5.0    -0.5    93.2
 GRAS  A    3 D    -0.5     1.1     3.4
 GUAM  A    4 D    -3.2     0.0    16.0
 GUAO  A    1 D    -1.0     1.0     8.7
 HARB  A    1 D    -1.4     3.6    14.3
 HLFX  A    1 D    -1.1    -1.0    16.6
 HNLC  A    1 D    -2.4    -1.2    10.2
 HOB2  A    2 D    -2.5    -0.2    14.6
 HOFN  A    2 D     0.8     0.5     3.3
 HOLM  A    1 D    -0.5    -0.5     0.5
 HRAO  A    1 D    -3.1     1.8    16.0
 HYDE  A    2 D    -2.1    -1.6     9.9
 IISC  B    2 D    -1.5    -1.0     8.2
 IRKT  A    1 D     0.5     1.0    18.0
 ISPA  A    1 D    -1.3    -2.7     9.7
 JAB1  A    2 D    -0.6     0.2    13.9
 JOZE  A    2 D     1.2     0.0    -4.9
 KARR  A    1 D    -0.5     1.6    10.0
 KELY  B    1 D    -0.2    -0.5     0.6
 KERG  A    2 D    -2.7     1.7    18.2
 KIT3  A    1 D    -1.1    -0.9    28.9
 KOKB  A    5 D    -3.4     1.1     9.9
 KUNM  A    2 D    -1.9     1.9    21.8
 LAE1  A    1 D    -1.6    -1.4    19.9
 LPGS  A    1 D    -2.2    -0.8    24.0
 MAC1  A    4 D    -3.2    -0.1    18.4
 MADR  A    9 D    -0.5     0.1     5.5
 MALI  A    2 D    -1.8     0.5    14.1
 MANA  A    2 D    -4.5    -2.4    17.7
 MAS1  A    1 D    -1.6    -2.1     7.9
 MATE  A    4 D     0.6     1.3     9.7
 MAW1  A    1 D    -3.3     1.3    10.7
 MBAR  A    1 D    -2.4     0.6    15.9
 MCM4  A    3 D    -1.2     1.3     4.3
 MDO1  A    3 D    -3.6    -2.5    20.1
 MDVJ  A    1 D     4.1    -0.2    14.9
 METS  A    1 D     0.4     0.8     1.2
 MKEA  A    1 D    -3.5     0.9    12.7
 NICO  A    2 D    -3.2     1.1    17.3
 NKLG  A    1 D    -0.8     3.1    14.1
 NLIB  A    2 D    -0.6    -1.4    15.0
 NOT1  A    1 D     0.1     3.7    10.2
 NOUM  A    1 D     1.0    -1.0     7.5
 NOVJ  A    1 D     5.3    -3.0    34.9
 NRC1  A    1 D    -1.3    -0.5    16.2
 NRIL  A    1 D     0.7     0.8     3.5
 NYA1  A    2 D    -0.3     0.3    -9.7
 NYAL  A    3 D    -0.9    -0.3    -8.9
 OHI2  A    1 D    -2.2    -1.3     8.7
 OHI3  A    1 D    -6.5    -1.0     1.2
 ONSA  A    3 D     0.2     0.4     1.6
 PDEL  A    1 D    -1.2    -3.2     5.3
 PERT  A    4 D    -0.9     2.0    19.6
 PETP  A    3 D     0.1    -0.1    12.8
 PIE1  A    1 D    -1.7    -2.0    11.7
 PIMO  A    3 D    -2.4     1.4    19.9
 POL2  A    1 D     0.6    -0.7    18.0
 POLV  A    1 D     0.3     1.1     0.4
 POTS  A    1 D    -0.2     0.8     0.9
 QAQ1  A    3 D    -0.5    -1.2     5.9
 QUIN  A    3 D    -3.5    -1.6    10.4
 RABT  A    1 D    -0.7     1.0    11.8
 RAMO  A    3 D    -3.4     0.3    12.9
 REUN  A    1 D    -1.6    -0.6    20.8
 REYK  A    3 D     0.1    -0.7     2.1
 RIOG  A    1 D    -2.0    -0.4    14.7
 SANT  A    3 D    -2.6    -1.4     9.4
 SCH2  A    1 D    -0.8    -0.9    15.4
 SCUB  A    1 D    -2.2     1.4    14.4
 SEY1  A    2 D    -1.2     0.2    11.7
 SFER  A    5 D     0.8     1.9     3.4
 STJO  A    4 D    -2.1    -1.3    16.7
 SUTH  A    1 D    -3.1     2.1    12.2
 SYOG  A    1 D    -4.0     0.3    21.9
 THTI  A    1 D    -1.2     0.8    22.3
 THU3  A    1 D    -1.8    -1.0    -3.6
 TIDB  A    2 D    -1.6     0.1    16.6
 TIXI  A    1 D    -0.4     0.7     1.4
 TOW2  A    1 D    -0.4    -0.8    11.3
 TRAB  A    1 D    -0.8     0.9    16.6
 TRO1  A    4 D     0.5     0.4    -3.3
 TROM  A    1 D     0.6     0.8     2.0
 TSKB  A    2 D    -1.8     0.7    13.5
 ULAB  A    1 D     0.7     1.6    17.1
 UNSA  A    1 D    -2.1    -1.0    11.9
 USNO  A    1 D    -1.7    -0.5    18.5
 VESL  A    1 D    -3.6    -0.1    -5.1
 VILL  A    5 D    -0.8    -0.2    11.1
 WES2  A    9 D    -1.9    -0.8    20.4
 WHIT  A    1 D    -0.2    -0.0    12.2
 WILL  A    1 D    -0.5    -0.9    11.9
 WSRT  A    1 D    -0.1     0.5     3.8
 WTZR  A    3 D    -0.3     0.5     3.1
 WUHN  A    4 D     0.0     2.9    22.1
 YAR1  A    2 D    -0.2     1.9    11.4
 YELL  A    5 D    -0.6    -1.1    12.8
 YSSK  A    2 D    -0.2     1.6     7.7
 ZIMM  A    2 D     0.7     2.8     2.0

 Obs. Mean         -1.2     0.1    11.5
 Mean Std.          1.6     1.4    10.6
 R.M.S.             2.0     1.4    15.6

2-2)	IGS05 --> ITRF2005:
---------------------------

	To remain consistent with ITRF2005, the proposed realization was
also realigned to ITRF2005 using a 7-parameters transformation (3 rotations,
3 translations, 1 scale); the rates were assumed unaffected by the phase
center change.
The estimated transformation parameters are:

   R X (mas)   :              -0.01118
   R Y (mas)   :              -0.00693
   R Z (mas)   :              -0.00046
   T X (m)     :               0.00165
   T Y (m)     :              -0.00016
   T Z (m)     :               0.00236
   SCL (ppb)   :              -1.85533

	This shows the effect of the relative to absolute phase center
calibration change.  Note that ALRT, GOUG and NOVJ were excluded from
the estimation of the transformation parameters due to the size of their
phase center corrections.  As expected, the scale is the dominant parameter.

The residuals ITRF2005 minus IGS05 (after transformation):

 SOLUTION ESTIMATE Difference (mm) & (mm/y)

 Code Pt Soln d  d. Lat  d. Lon  d. Hei
                   (mm)    (mm)    (mm)
 ALGO  A    7 D    -0.6    -1.1    -6.7
 ALIC  A    1 D    -1.1     1.0     0.7
 ALRT  A    1 D     1.8    -0.4    22.1
 AMC2  A    4 D    -0.8     0.7    -0.5
 ARTU  A    3 D    -2.0     1.8    -6.0
 ASC1  A    1 D    -1.6     2.8     5.8
 ASPA  A    1 D     0.3    -1.9     9.9
 BAHR  A    1 D    -0.1     1.8    -5.5
 BILI  A    4 D    -2.4    -1.4    12.7
 BJFS  A    1 D    -1.5    -0.4   -14.9
 BOR1  A    2 D     0.0    -0.1     4.4
 BRAZ  A    1 D    -0.2     0.9    -0.8
 BRUS  A    2 D    -0.5    -0.3     5.3
 CAGL  A    3 D    -1.3    -2.0     5.3
 CAS1  A    3 D     3.4     0.3     7.8
 CEDU  A    1 D    -1.0     0.5    -4.8
 CHAT  A    1 D     2.7    -0.9    -4.3
 CHPI  A    1 D    -0.5     1.5     1.2
 CHUR  A    4 D    -2.0     0.3    -3.9
 COCO  A    3 D    -0.6    -0.5     4.3
 CONZ  A    2 D    -0.0    -0.1     1.4
 CRO1  A    1 D     0.2    -0.9    -8.6
 DAEJ  A    1 D    -2.1    -1.4    -5.1
 DARW  A    1 D    -1.2     0.4     0.9
 DAV1  A    1 D     2.2     1.4     4.7
 DGAR  A    2 D    -1.2     2.9     6.4
 DRAO  A    3 D    -0.9    -0.1    -2.1
 DUBO  A    4 D    -2.4     0.6    -9.9
 FAIR  A    6 D    -0.9    -1.3     0.0
 FLIN  A    2 D    -2.3     0.4    -2.1
 GLPS  A    1 D    -0.6    -1.0     3.8
 GLSV  A    1 D    -0.7    -2.3     4.0
 GODE  A    2 D    -0.6    -1.5    -5.4
 GOLD  A    7 D     0.6     0.3     3.1
 GOUG  A    1 D     1.9     0.6   -81.1
 GRAS  A    3 D    -0.3    -1.0     5.6
 GUAM  A    4 D     0.9     0.9    -3.3
 GUAO  A    1 D    -0.5     0.5     1.6
 HARB  A    1 D    -1.3    -2.5    -2.7
 HLFX  A    1 D    -0.4    -0.4    -7.1
 HNLC  A    1 D    -0.3     0.6     2.1
 HOB2  A    2 D     2.2     0.8    -0.1
 HOFN  A    2 D    -0.7    -1.0     5.7
 HOLM  A    1 D    -1.1    -0.7     9.3
 HRAO  A    1 D     0.4    -0.7    -4.4
 HYDE  A    2 D     0.2     3.2     1.1
 IISC  B    2 D    -0.5     2.6     2.9
 IRKT  A    1 D    -2.0     0.5    -7.7
 ISPA  A    1 D    -0.8     1.0     3.6
 JAB1  A    2 D    -1.0     0.9    -0.3
 JOZE  A    2 D    -1.6     0.4    13.9
 KARR  A    1 D    -1.0    -0.2     3.5
 KELY  B    1 D    -0.1    -0.7     8.6
 KERG  A    2 D     1.1     0.2    -4.9
 KIT3  A    1 D    -0.2     2.3   -19.0
 KOKB  A    5 D     0.7    -1.7     2.4
 KUNM  A    2 D    -0.1    -0.4   -10.5
 LAE1  A    1 D    -0.2     2.2    -6.3
 LPGS  A    1 D    -0.7    -0.5   -11.7
 MAC1  A    4 D     3.5     0.3    -3.7
 MADR  A    9 D    -0.5    -0.3     3.5
 MALI  A    2 D    -0.6     0.7    -3.3
 MANA  A    2 D     1.9     0.8    -6.6
 MAS1  A    1 D    -0.1     1.7     1.4
 MATE  A    4 D    -1.5    -0.9    -0.6
 MAW1  A    1 D     2.1     0.6     3.1
 MBAR  A    1 D     0.0     0.4    -5.4
 MCM4  A    3 D     2.6    -1.4    10.2
 MDO1  A    3 D     1.1     1.0    -9.3
 MDVJ  A    1 D    -4.4     1.0    -5.7
 METS  A    1 D    -0.4    -0.3     7.8
 MKEA  A    1 D     0.8    -1.6    -0.3
 NICO  A    2 D     2.0    -0.3    -7.9
 NKLG  A    1 D    -1.7    -2.7    -3.9
 NLIB  A    2 D    -1.5    -0.1    -4.8
 NOT1  A    1 D    -1.2    -3.3    -1.0
 NOUM  A    1 D    -2.2     1.1     6.7
 NOVJ  A    1 D    -6.3     4.5   -25.1
 NRC1  A    1 D    -0.4    -1.0    -6.5
 NRIL  A    1 D    -1.3     0.6     6.1
 NYA1  A    2 D     1.2    -0.2    18.9
 NYAL  A    3 D     1.8     0.4    18.1
 OHI2  A    1 D    -0.1    -0.0     4.8
 OHI3  A    1 D     4.2    -0.3    12.3
 ONSA  A    3 D    -0.3    -0.2     7.4
 PDEL  A    1 D    -0.1     2.5     3.8
 PERT  A    4 D    -0.2    -0.6    -5.8
 PETP  A    3 D    -2.5     0.8    -1.9
 PIE1  A    1 D    -0.8     0.6    -0.9
 PIMO  A    3 D     0.2    -0.1    -7.7
 POL2  A    1 D    -1.9     2.1    -8.0
 POLV  A    1 D    -0.9    -0.3     8.8
 POTS  A    1 D    -0.2    -0.6     8.1
 QAQ1  A    3 D     0.0     0.1     3.2
 QUIN  A    3 D     1.0     0.3     0.4
 RABT  A    1 D    -0.6    -1.2    -2.7
 RAMO  A    3 D     2.0     0.6    -3.4
 REUN  A    1 D    -0.7     2.2    -8.9
 REYK  A    3 D    -0.1     0.0     6.9
 RIOG  A    1 D    -0.4    -1.1    -1.4
 SANT  A    3 D    -0.1    -0.1     3.1
 SCH2  A    1 D    -0.3    -0.5    -6.0
 SCUB  A    1 D    -0.2    -2.9    -3.9
 SEY1  A    2 D    -1.1     1.3    -0.5
 SFER  A    5 D    -2.0    -2.1     5.7
 STJO  A    4 D     0.9     0.1    -7.4
 SUTH  A    1 D     0.3    -1.1    -0.4
 SYOG  A    1 D     2.1     1.3    -8.3
 THTI  A    1 D    -0.6    -1.9    -8.5
 THU3  A    1 D     1.6    -0.4    12.9
 TIDB  A    2 D     0.9     0.5    -2.2
 TIXI  A    1 D    -1.1     0.5     8.5
 TOW2  A    1 D    -1.0     1.5     2.7
 TRAB  A    1 D    -0.2     0.0    -7.2
 TRO1  A    4 D    -0.0    -0.1    12.4
 TROM  A    1 D    -0.1    -0.5     7.1
 TSKB  A    2 D    -0.6     0.3    -2.0
 ULAB  A    1 D    -2.4    -0.1    -6.6
 UNSA  A    1 D    -0.8    -0.4     0.2
 USNO  A    1 D    -0.2    -1.0    -8.6
 VESL  A    1 D     1.1     0.5    18.6
 VILL  A    5 D    -0.2     0.0    -2.1
 WES2  A    9 D     0.2    -0.6   -10.7
 WHIT  A    1 D    -2.0    -0.9    -1.9
 WILL  A    1 D    -1.7    -0.3    -1.5
 WSRT  A    1 D    -0.2    -0.4     5.1
 WTZR  A    3 D    -0.2    -0.3     5.9
 WUHN  A    4 D    -2.1    -1.5   -10.8
 YAR1  A    2 D    -1.0    -0.4     2.3
 YELL  A    5 D    -1.2    -0.2    -2.8
 YSSK  A    2 D    -2.1    -0.6     3.3
 ZIMM  A    2 D    -1.3    -2.7     7.0

 Obs. Mean         -0.3    -0.0    -0.5
 Mean Std.          1.5     1.3    10.3
 R.M.S.             1.5     1.3    10.2

The following section compares the proposed realization with a recent
cumulative solution.

3) IGS05 - IGS cumulative solution:
-----------------------------------

	The proposed IGS05 realization was also compared to the cumulative
solution (IGS06P34.snx) at GPS week 1390 (06/08/30 - 06:242:00000).
Absolute phase center corrections are used in both solutions.
The differences (IGS05 - IGS06P34.snx) are:

 Code Pt Soln d  d. Lat  d. Lon  d. Hei  d.VLat  d.VLon  d.VHei
 ALGO  A    7 d    -0.1    -0.0     0.6      0.2     0.2    -0.0
 ALIC  A    1 d    -0.6     0.0     1.8      0.6     0.2    -1.1
 ALRT  A    1 d    -1.6     0.7     2.6     -1.0     0.4     0.9
 AMC2  A    4 d    -0.7     0.4    -2.2      0.2     0.4    -1.0
 ARTU  A    3 d    -0.2    -0.7    -1.0      0.4    -0.7    -0.7
 ASC1  A    1 d     0.4    -0.1    -0.3      0.5    -0.4    -0.9
 ASPA  A    1 d    -1.1    -0.3    -1.7      0.7     0.4    -2.0
 BAHR  A    1 d    -0.5    -0.7    -2.1      0.5    -0.6    -1.2
 BILI  A    4 d     0.9     0.2    -1.6      1.1     0.3    -1.3
 BJFS  A    1 d    -1.0    -0.7    -1.6      0.7    -0.3    -1.1
 BOR1  A    2 d    -0.0    -0.4    -1.8      0.2    -0.6    -0.7
 BRAZ  A    1 d     0.6     1.0     1.7      0.7    -0.1    -0.4
 BRUS  A    2 d    -0.6    -0.1    -1.9     -0.1    -0.5    -0.7
 CAGL  A    3 d    -0.4    -0.3    -2.3      0.1    -0.5    -1.1
 CAS1  A    3 d    -0.9    -0.3    -0.6     -0.1     0.3    -2.0
 CEDU  A    1 d    -0.3    -0.2     3.2      0.6     0.2    -0.8
 CHAT  A    1 d    -0.4    -0.3     1.8      0.7     0.3    -1.2
 CHPI  A    1 d     0.0     1.0     4.6      0.6     0.1     1.1
 CHUR  A    4 d    -0.5     0.2    -0.2     -0.1     0.1    -1.2
 COCO  A    3 d    -3.2     1.1     1.3     -2.4     1.1     0.1
 CONZ  A    2 d     0.9     0.3     0.2      1.5    -0.4    -1.1
 CRO1  A    1 d    -0.5    -0.5     0.8      0.4    -0.1    -0.1
 DAEJ  A    1 d    -0.0    -0.2    -2.0      1.0    -0.1    -1.2
 DARW  A    1 d    -1.2     0.0    -0.0      0.6     0.2    -1.5
 DAV1  A    1 d    -0.8    -0.4     0.2     -0.3     0.0    -1.8
 DGAR  A    2 d    -1.9    -1.4     1.1     -1.0    -1.4     0.7
 DRAO  A    3 d     0.3     0.8     1.9      0.5     0.6     0.2
 DUBO  A    4 d    -0.5     0.4     6.3      0.0     0.5     3.5
 FAIR  A    6 d    -1.9     0.4     2.7     -0.5     0.5     1.3
 FLIN  A    2 d     0.1     0.5     1.4      0.3     0.5     0.1
 GLPS  A    1 d     1.3     1.6    -6.2      1.3     0.6    -3.5
 GLSV  A    1 d    -0.9    -0.6    -2.0      0.1    -0.7    -0.7
 GODE  A    2 d    -0.5    -0.1     0.3      0.2     0.1    -0.1
 GOLD  A    7 d    -1.7     0.9     3.2     -0.2     0.7     1.4
 GRAS  A    3 d    -0.6     0.4    -4.7     -0.4    -0.0    -3.5
 GUAM  A    4 d    -3.1    -1.6     0.2      0.0    -0.5    -0.9
 GUAO  A    1 d     1.5     0.9    -2.9      1.4     0.1    -1.8
 HARB  A    1 d    -0.2     1.6    -1.8      0.3     0.3    -2.1
 HLFX  A    1 d    -0.2     0.8    -0.1      0.2     0.5    -0.3
 HNLC  A    1 d    -0.2     0.1     0.1      1.0     0.5    -0.4
 HOB2  A    2 d     0.9     0.2     0.1      1.5     0.6    -1.8
 HOFN  A    2 d     0.3    -1.7    -4.6      0.0    -0.9    -1.8
 HOLM  A    1 d     0.6     0.4     0.8      0.4     0.6     0.2
 HRAO  A    1 d     1.1    -1.5     2.8      0.6    -0.8    -0.7
 IRKT  A    1 d    -0.4    -0.8    -0.2      0.8    -0.5    -0.6
 ISPA  A    1 d    -1.3     1.3    -8.3      0.2     0.5    -6.2
 JAB1  A    2 d     0.3    -0.2     8.0      0.9     0.2     1.8
 JOZE  A    2 d    -1.2     2.8    10.6     -0.6     2.0     8.6
 KARR  A    1 d    -0.3    -0.5     2.7      0.6     0.0    -0.9
 KELY  B    1 d     0.1     0.1    -0.4     -0.1     0.1     0.9
 KERG  A    2 d    -0.5    -0.8     2.2      0.0    -0.2    -1.3
 KIT3  A    1 d    -0.0    -0.7    -0.3      0.6    -0.6    -0.6
 KOKB  A    5 d    -1.3    -0.8    -4.6      0.0    -0.1    -3.1
 KUNM  A    2 d     4.3     2.8    15.0     22.7     5.4    16.6
 LAE1  A    1 d    -0.6    -0.3     2.7      0.8     0.1    -0.7
 LPGS  A    1 d     0.6    -0.4    -0.0      0.7    -0.4    -1.0
 MADR  A    9 d     0.2     0.1     0.0      0.2    -0.3    -0.4
 MALI  A    2 d    -0.3    -0.4     2.3      0.4    -0.5    -0.7
 MANA  A    2 d     9.2     4.3     0.7     10.4     4.1     1.4
 MAS1  A    1 d     0.5     0.3     1.6      0.3    -0.3    -0.1
 MATE  A    4 d     0.3     0.1     0.1      0.3    -0.4    -0.4
 MAW1  A    1 d    -0.7    -0.9    -0.4     -0.3    -0.2    -2.0
 MBAR  A    1 d     0.1    -0.6     1.1      0.5    -0.5    -0.8
 MCM4  A    3 d    -0.9     0.8     0.6      0.1     0.6    -1.6
 MDO1  A    3 d     0.2     0.8    -1.3      1.0     0.6    -1.1
 MDVJ  A    1 d     1.4     0.3     0.5      1.3    -0.2     0.3
 METS  A    1 d    -0.2    -0.5    -2.0      0.1    -0.6    -0.6
 MKEA  A    1 d    -0.6    -0.7    -1.3      0.9     0.2    -0.8
 NICO  A    2 d     0.2    -1.1     0.4      0.4    -0.7    -0.5
 NKLG  A    1 d     1.1    -0.8    -1.2      0.7    -0.6    -1.4
 NLIB  A    2 d    -0.5    -0.2     1.2      0.3    -0.1     0.5
 NOT1  A    1 d    -0.4    -0.3    -1.4      0.2    -0.5    -1.1
 NOUM  A    1 d    -0.1    -0.4     1.7      0.9     0.2    -1.0
 NOVJ  A    1 d     0.9     0.4    -2.7      1.2    -0.2    -1.7
 NRC1  A    1 d    -0.3    -0.1     1.0      0.2     0.2     0.1
 NRIL  A    1 d     0.3    -0.7     0.3      0.7    -0.6    -0.2
 NYA1  A    2 d    -0.2    -1.3     3.3     -0.2    -1.0     1.4
 NYAL  A    3 d    -0.6     0.1     3.4     -0.3    -0.3     1.4
 OHI2  A    1 d     1.7    -0.9    -6.2      1.0    -0.7    -3.8
 OHI3  A    1 d     1.5     0.3   -10.6      1.1    -0.3    -6.8
 ONSA  A    3 d    -0.4    -0.4    -2.9      0.0    -0.6    -0.9
 PDEL  A    1 d    -0.4    -0.0    -0.4      0.0    -0.3    -0.7
 PERT  A    4 d     1.3    -0.7    -0.8      1.3    -0.1    -2.1
 PIE1  A    1 d    -1.3     0.9     0.2      0.4     0.4    -0.2
 PIMO  A    3 d    -1.3    -0.3    -6.3      0.1     0.3    -4.5
 POL2  A    1 d     0.1    -0.6    -1.4      0.7    -0.6    -0.9
 POLV  A    1 d     0.0    -0.4    -4.2      0.3    -0.6    -1.8
 POTS  A    1 d    -0.2    -0.4    -1.3      0.1    -0.6    -0.4
 QAQ1  A    3 d    -0.2     0.3    -2.3     -0.1     0.2    -1.4
 QUIN  A    3 d     0.4     0.1     4.1      0.7     0.4     0.9
 RABT  A    1 d     0.1     0.0    -0.2      0.3    -0.4    -0.5
 RAMO  A    3 d     1.8    -3.5    -3.2      1.6    -2.5    -2.2
 REUN  A    1 d     0.7    -0.1     3.6      0.7     0.0     0.7
 REYK  A    3 d     0.1     1.1     1.6     -0.1     0.1     0.3
 RIOG  A    1 d    -0.3     0.0    -1.9      0.5    -0.4    -1.9
 SANT  A    3 d     0.5     0.3    -1.2      0.8    -0.2    -1.4
 SCH2  A    1 d     0.0    -0.3    -0.1      0.0     0.1    -0.1
 SCUB  A    1 d    -1.6    -1.4    -0.4     -0.0    -0.4    -0.5
 SEY1  A    2 d     2.3     0.9     7.1      1.0    -0.1     0.3
 SFER  A    5 d     0.9     0.6    -3.8      0.8     0.0    -2.0
 STJO  A    4 d    -0.4     0.2     1.4     -0.0     0.0     0.1
 SUTH  A    1 d     0.3    -1.8     0.0      0.4    -0.8    -2.3
 SYOG  A    1 d    -0.0    -1.0     1.7     -0.2    -0.4    -1.3
 THTI  A    1 d    -0.6    -0.3    -2.2      0.9     0.3    -1.7
 THU3  A    1 d    -1.2     0.1    -3.6     -0.7     0.2    -1.7
 TIDB  A    2 d     0.1     0.3     2.2      0.7     0.3    -1.2
 TIXI  A    1 d     0.3     0.1    -1.5      0.8    -0.1    -0.6
 TOW2  A    1 d    -0.1     0.4     2.4      0.9     0.3    -0.9
 TRAB  A    1 d     0.3    -0.3    -1.8      0.5    -0.6    -1.0
 TRO1  A    4 d     0.5    -0.0    -5.2      0.5    -0.4    -3.2
 TROM  A    1 d     0.0     1.4    -0.2     -0.0    -0.2    -0.0
 TSKB  A    2 d    -0.1    -1.0    -1.7      1.0    -0.2    -1.0
 ULAB  A    1 d     0.1    -0.2    -0.3      0.9    -0.3    -0.7
 UNSA  A    1 d     0.6     0.4    -0.7      0.9    -0.2    -1.1
 USNO  A    1 d     0.2    -0.4     1.1      0.4     0.1     0.1
 VESL  A    1 d     0.5    -0.8    -1.3      0.1    -0.6    -2.0
 VILL  A    5 d    -1.6    -2.0    -0.3     -1.0    -1.8    -0.4
 WES2  A    9 d    -0.8    -0.5    -1.2     -0.1    -0.1    -1.0
 WHIT  A    1 d     0.4     0.7    -0.5      0.5     0.6    -0.2
 WILL  A    1 d     0.0     0.9     1.5      0.4     0.6     0.1
 WSRT  A    1 d    -0.4    -0.1    -0.5      0.0    -0.5    -0.4
 WTZR  A    3 d    -0.3    -0.1     0.2      0.1    -0.5    -0.3
 WUHN  A    4 d     0.6     0.5    -4.0      1.3     0.3    -2.3
 YAR1  A    2 d    -0.5    -0.9     0.7      0.5    -0.0    -1.5
 YELL  A    5 d     0.8     0.7     0.2      0.5     0.6    -0.1
 YSSK  A    2 d     3.2     0.6     1.5      2.8     0.4     0.2
 ZIMM  A    2 d    -0.6     0.0    -1.4      0.0    -0.4    -0.6

 Obs. Mean         -0.0    -0.0    -0.1      0.6    -0.0    -0.6
 Mean Std.          1.3     0.9     3.2      2.2     0.8     2.2
 R.M.S.             1.3     0.9     3.1      2.3     0.8     2.3

Stations PETP, HYDE, MAC1 were removed from the statistics due to larger
residuals. Those large residuals were traced back to short time series
< 2 years for the segment. Since no condition is currently imposed on the
velocity in the cumulative solution, short segments can have unreliable
velocity estimates.
Velocity conditions are imposed in ITRF solution.
As was done in the earlier "preliminary" realizations of ITRF, the
coordinates/velocity were extracted directly from ITRF rather that the
IGS cumulative solution. This should address some legitimate concern
that ITRF should whenever possible be used directly. The above statistics
suggest that we have probably reached this time to switch back to a more
direct connection with ITRF.

4) IGb00 - IGS05:
-----------------

	The transformation parameters between the currently official
realization (IGb00) and the proposed realization
(IGS00) are important to connect the IGS products.
The estimated transformation parameters are available in section 4-1)
and the corresponding residuals are available in the section 4-2.
	The official transformation parameters between ITRF2000 - ITRF2005
are provided by
(http://itrf.ensg.ign.fr/ITRF_solutions/2005/tp_05-00.php)

4-1)	IGb00 - IGS05 Transformation:
-------------------------------------

	The (14) transformation parameters were estimated using a subset of
60 stations from the proposed IGS05 to the current IGS realization (IGb00).
The results are below, along with the official ITRF estimates (epoch 2000.0).
To ensure consistency between IGb00 and IGS05, the latter did not include
the relative to absolute phase center correction for the estimation of
the transformation parameters.

( Epoch 2000.0 )                IGS          ITRF       IGS-ITRF
   R X (mas)   :              -0.0224      0.0000       -0.0224
   R Y (mas)   :               0.0341      0.0000        0.0341
   R Z (mas)   :              -0.0099      0.0000       -0.0099
   T X (m)     :               0.0000      0.0001       -0.0001
   T Y (m)     :              -0.0017     -0.0008       -0.0009
   T Z (m)     :              -0.0053     -0.0058        0.0005
   SCL (ppb)   :               0.8473      0.4000        0.4473
 d R X (mas/y) :               0.0033      0.0000        0.0033
 d R Y (mas/y) :              -0.0001      0.0000       -0.0001
 d R Z (mas/y) :              -0.0161      0.0000       -0.0161
 d T X (m/y)   :              -0.0004     -0.0002       -0.0002
 d T Y (m/y)   :               0.0007      0.0001        0.0006
 d T Z (m/y)   :              -0.0018     -0.0018        0.0000
 d SCL (ppb/y) :               0.1748      0.0800        0.0848

	The more significant difference at the reference epoch is with
the scale (and rate) (0.5ppb  ~ 3.3mm) followed by the X&Y rotations
(0.03mas ~ 0.9mm at the equator).

4-2)	Residuals:
------------------

The residuals after the transformation (IGS05-IGb00) at epoch 2000.0 are:

 Code Pt Soln d  d. Lat  d. Lon  d. Hei  d.VLat  d.VLon  d.VHei
                   (mm)    (mm)    (mm)  (mm/y)  (mm/y)  (mm/y)
 ALGO  A ---- D    -0.8     0.3     2.4      0.1    -0.3    -2.1
 ALIC  A ---- D     0.0    -0.4     2.7      0.4     0.3    -1.4
 ARTU  A ---- D    -0.6     0.6     1.1      0.4    -0.1     0.4
 ASC1  A ---- D    -0.0    -1.1    -0.7     -0.1     0.3     0.8
 BAHR  A ---- D    -0.1    -0.7     0.1      0.2     0.6    -0.0
 BOR1  A ---- D    -0.1     1.7    -1.2      0.2    -0.5     1.1
 BRUS  A ---- D    -1.7     1.5     1.4      0.9    -0.8    -0.2
 CAS1  A ---- D     0.7     0.7    -2.8     -0.1    -0.3     0.7
 CEDU  A ---- D     0.3    -0.5     2.5      0.2     0.3    -1.2
 CHAT  A ---- D    -0.3    -0.3    -1.0      0.6     0.4     1.4
 CHUR  A ---- D     2.4     2.7     3.8      0.2    -0.4    -1.5
 CRO1  A ---- D    -0.8    -0.2    -3.8     -0.1     0.5     2.7
 DARW  A ---- D    -2.0     0.4     1.0      1.0    -0.0    -0.5
 DAV1  A ---- D     0.3     0.7     1.0     -0.0    -0.5    -0.7
 DRAO  A ---- D    -1.2     0.5     1.8      0.2    -0.4    -1.3
 FLIN  A ---- D    -1.8     0.6     2.4      0.3    -0.4    -1.4
 GLSV  A ---- D    -0.3     0.3    -0.5      0.5     0.1     0.7
 GODE  A ---- D    -0.5     0.8    -0.8     -0.2    -0.8    -1.0
 GOLD  A ---- D     1.3    -5.6    -2.5      0.4     1.4    -0.7
 GUAM  A    2 D     0.5    -1.1     1.3      0.2     0.8    -0.1
 HOB2  A ---- D    -2.4     2.7    -3.8      0.1     0.3    -0.9
 HRAO  A ---- D     1.2     0.0    -1.6     -0.9     0.1     1.1
 IRKT  A ---- D     0.5     0.1    -0.4      0.0     0.4    -0.1
 KARR  A ---- D    -0.2    -0.1     2.3      0.5     0.1    -1.0
 KELY  B ---- D    -1.3     2.5     1.5      0.3    -1.1     0.5
 KERG  A ---- D     0.2     0.4     2.0     -0.0    -0.3    -1.3
 KIT3  A ---- D     0.4    -0.3     0.9      0.3     0.3     0.4
 LPGS  A ---- D     0.3     0.4     0.5     -0.4    -0.3     1.6
 MALI  A ---- D     2.1    -3.3    -2.1     -1.0     1.5     0.8
 MAS1  A ---- D    -0.2    -1.0     0.0     -0.4     0.3    -0.5
 MATE  A ---- D    -1.4     2.6    -0.2      0.5    -0.9     0.2
 MAW1  A ---- D    -0.1     0.3    -0.7      0.2    -0.2     0.6
 MCM4  A ---- D    -1.0    -2.3     0.3      0.6     0.9    -1.3
 MKEA  A ---- D     0.1     2.5     3.7      0.4    -0.8    -2.1
 NICO  A ---- D    -0.2    -1.1     3.7      0.1     0.5    -1.3
 NKLG  A ---- D     0.4    -0.2    -0.1     -0.5     0.1     0.6
 NLIB  A ---- D    -2.8    -1.5    -0.6      0.6    -0.3    -1.8
 NOUM  A ---- D     0.5    -1.1     0.6     -0.2     1.0    -0.2
 NRC1  A ---- D    -0.8     0.1     2.0      0.3    -0.2    -1.5
 ONSA  A ---- D     0.4    -0.1    -4.5     -0.2     0.1     2.5
 PERT  A ---- D    -4.8    -0.6    -2.6      0.1     0.3    -0.7
 PIE1  A ---- D    -0.5     0.9     0.0      0.7    -0.9    -0.8
 POL2  A ---- D     0.2     0.3     0.6      0.3     0.2     0.9
 POTS  A ---- D    -0.0     0.1     0.0      0.1     0.2     0.9
 RIOG  A ---- D    -0.0    -0.1    -1.6     -0.2     0.0     2.1
 SANT  A ---- D     0.1    -0.2    -1.3     -0.2    -0.1     1.5
 SCH2  A ---- D    -0.8    -0.1     2.0     -0.5    -0.5    -2.1
 STJO  A ---- D    -0.7    -0.5     0.6      0.4    -0.1    -0.6
 SYOG  A ---- D    -0.1     0.7     1.1      0.1    -0.4    -0.6
 THTI  A ---- D    -1.5     0.9    -0.7      1.2    -0.7     1.1
 TIDB  A ---- D     0.3    -0.2     0.1     -0.2     0.0    -0.7
 TIXI  A ---- D     0.0     0.5    -3.2     -0.1    -0.2     2.3
 TOW2  A ---- D    -0.0     0.4     0.0      0.4    -0.2     0.3
 TRAB  A ---- D    -0.7     0.8     0.3      0.5    -0.2    -0.3
 TSKB  A ---- D     0.1    -0.1    -0.2     -0.4    -0.4     1.4
 UNSA  A ---- D     0.9     0.4    -4.5     -0.8    -0.6     2.2
 VESL  A ---- D    -0.8    -0.3    -0.7      0.4     0.1     0.8
 WSRT  A ---- D    -0.2     0.1     0.4      0.2    -0.1    -0.2
 WTZR  A ---- D    -0.4    -0.0    -2.1      0.2     0.2     0.8
 YELL  A ---- D    -0.7     0.5     0.3      0.1    -0.2    -0.4

 Obs. Mean         -0.3     0.1    -0.0      0.1    -0.0     0.0
 Mean Std.          1.1     1.3     1.9      0.4     0.5     1.2
 R.M.S.             1.1     1.3     1.9      0.4     0.5     1.2

4-4)	Scale:
--------------

	Comparison of the scale factor for GPS weeks 1385-9 show the
following change
	cod   co2  emr   em2  gfz   gf2  mit   mi2  sio  si2

1385	2.71 -0.77 4.47 -0.60 2.22 -0.68 3.58 -0.31 3.37 0.27
1386	2.71 -0.73 4.47 -0.53 2.26 -0.70 3.48 -0.50 3.22 0.20
1387	2.91 -0.73 4.50 -0.45 2.29 -0.69 3.41 -0.42 3.39 0.37
1388	2.86       4.63 -0.23 2.32 -0.64 3.45 -0.50 3.12 0.33
1389	2.90 -0.72 4.52 -0.40 1.97 -0.80 3.44 -0.51 3.26 0.18

Avg.  2.82 -0.74 4.52 -0.44 2.21 -0.70 3.47 -0.45 3.27 0.20

The average scale factor goes from 3.26 (IGb00 & relative antenna phase
center) to -0.41 (IGS05 & absolute antenna phase center).
This indicates a significant improvement of the IGS scale, which was
one of the important objective of the receiver antenna phase center
calibration change.

4-5)	Apparent geocenter:
---------------------------

	The comparison below shows the apparent weekly geocenter variations
between the official solutions using IGb00 and IGS05.
In the IGb00 combination, cod, emr, esa, jpl and sio solution were included
in the combined apparent geocenter. In the IGS05 solution the co2, em2, mi2
and si2 solutions are included.
         X-00 X-05	Y-00 Y-05	Z-00 Z-05
1385     0.4   2.9      4.4   2.0      -7.6   5.8
1386    -0.1   2.4      4.8   2.2     -10.0  -3.6
1387    -1.8  -1.3      4.9   7.7      -7.9  24.8
1388	  -4.1  -3.6      4.8   5.0      -9.1   1.1
1389     0.4   1.3      4.2   5.1      -8.7 -11.9
        ----  ----     ----  ----      ----  ----
Avg.    -1.0   0.3      4.6   4.4      -8.7   3.2

	The apparent geocenter X&Y coordinates indicates little changes.
However in the Z component there is a shift of about 12mm in the right
direction. The transformation parameters (Sect. 4-1) suggest a shift of
~5mm. If we disregard GPS week 1387 (24.8mm) the Z shift is about 6.5mm.

4-6)	ERP's:
--------------

	The effect of the Reference Frame and phase center changes can be
inferred from the rotational components of the transformation parameters
(Sect. 4-1). A reference frame rotation (RX, RY) has a direct effect on
the pole position (dXp, dYp) ; thus:
RX - dXp = 0         &  RY - dXp = 0

The rotation component of the transformation at GPS week ~1387 can be
estimated with (and Sect. 4-1):
RX = RX0 + dRX * dt  &  RY = RY0 + dRY * dt

RX = -0.006 mas      &  RY = 0.033 mas

	Comparison of the daily pole position between the solutions using
the available test solutions using IGS05 and the official results using
the official products (using IGb00) between GPS weeks 1385-1389 results
in the average pole position differences ( Official - new ):
dXp = 0.028 mas      & dYp = -0.005 mas

Then:

RX - dYp = -0.006 + 0.005 mas = -0.001 mas
RY - dXp =  0.033 - 0.028 mas =  0.005 mas

	The observed pole position differences and the predictions using the estimates transformations are consistent to better than 0.01mas for the
weeks considered.


5) Other changes:
-----------------

5.1)	Discontinuities:
------------------------

	All the "confirmed" and "probable" discontinuities are included as part
of the weekly combination. All the soln # in the weekly and cumulative
solutions are now consistent with the latest discontinuity table. The most
significant change appears in the cumulative solution where all relevant
discontinuities are now included.

5.2)	Satellite phase center:
-------------------------------

	The satellite phase center estimates provided by the ACs are included
in the combined in the weekly solutions. The weekly combination residual
file includes a table of the residuals of the adjustment for these new
parameters. A new section has been added in the summary report for these
parameters.

5.3)	Stations Antenna phase center + Cumulative Solution
-----------------------------------------------------------

	To consistently continue accumulating the igs weekly combined
solutions to the cumulative solution; the latter one has been corrected for
the phase center switch using the information derived from the parallel runs.
In the cases where corrections could not be derived directly from the parallel
runs, averages for antenna types were used. In the case where no corrections
were available, the stations were deleted to avoid mixing relative and
absolute antenna phase centers in one solution.
Stations deletion is generally limited to older sites.

6)	Parallel solutions:
-------------------------

	Combinations used in the analysis above have also been posted at:
ftp	macs.geod.nrcan.gc.ca
cd	/pub/requests/sinex/
cd xxxx_IGS05	xxxx=GPS week
Those and more will be updated/added as they become available.

Best regards,
Remi,