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[IGSMAIL-5713]: IGS Ultra Combination (IGU): 1466 2 18 (Resubmission Resubmission)
- To: igsmail @ igscb.jpl.nasa.gov
- Subject: [IGSMAIL-5713]: IGS Ultra Combination (IGU): 1466 2 18 (Resubmission Resubmission)
- From: Jim Ray <IGS.ACC @ noaa.gov>
- Date: Wed, 13 Feb 2008 13:04:41 +0000
- Sender: owner-igsmail
- User-agent: nail 11.25 7/29/05
******************************************************************************
IGS Electronic Mail 13 Feb 05:04:47 PST 2008 Message Number 5713
******************************************************************************
Author: AC Coordinator / NOAA NGS
sum-file Version 2.0
Ultra Rapid IGS Orbit Combination - Week 1466 Day: 2 Hour: 18 (Feb 12, 2008)
Contacts: J. Ray (jim.ray @ noaa.gov),
J. Griffiths (jake.griffiths @ noaa.gov)
COMBINATION STRATEGY:
---------------------
For a complete description of the combination strategy along with all tables
and statistics, please refer to the IGS Final Combination reports posted on
CDDIS within 13 days after the end of the GPS week.
PRODUCT FILES:
--------------
The Rapid Orbit files generated and uploaded into CDDIS @ NASA/GSFC are:
igu14662_18.sp3 IGR GPS ephemeris in SP3 format.
igu14662_18.erp Earth Rotation Parameters (ERP) and their rates as well as
Universal Time (UT1-UTC) and Length Of Day (LOD) associated
with IGS ephemerides.
igu14662_18.sum Combination summary report.
REMARKS concerning the IGU Orbit Combination:
---------------------------------------------
1. The following centre clock solutions, which provide broadcast and/or
predicted clock corrections, were excluded from the combination but kept
in the combination statistics:
-> Centre: GOU COU
2. The following orbit solutions were excluded from the combination because
they were biasing the weighted average. They were still used for statistics
computation unless all centres were excluded for the problem satellites in
which case they were simply eliminated from the combination and statistics.
The following table lists the exclusions:
Centre | PRN list
--------+---------------
USU | 15 15 15 15 15 15
3. The following orbit solutions were excluded from the combination because
less than 3 ACs have submitted results for given satellite(s).
The following table lists the exclusions:
Centre | PRN list
--------+---------------
COU | 32
ESU | 29
4. Starting on 5-Nov-2006 (GPS Week 1400-0, MJD 54044) all IGS products,
including the IGS combined orbits, are based on the IGS realization of
the ITRF2005 reference frame (IGS05). For more information see IGSMAIL #5447.
5. Starting on 5-Nov-2006 (GPS Week 1400, day 0, MJD 54044) the absolute antenna model
is introduced (IGSMAIL #5272). The antenna phase center offsets and phase center
variations are given in the file:
ftp://igscb.jpl.nasa.gov/pub/station/general/igs05.atx
ORBIT COMBINATION AND EVALUATION STATISTICS:
--------------------------------------------
Table 1: Daily transformation of each centre to the combined IGU orbit
and clocks.
WRMS - RMS weighted by the centres SP3 header accuracy codes.
STA - Number of stations in the daily solutions.
Table 1.1466.2 GPS week: 1466 Day: 2 MJD: 54508.750
CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS| TOFT TDRFT SDEV RMS
| [mm] [mm] [mm] [uas] [uas] [uas] [ppb] [mm] [mm]| [ps] [ps/d] [ps] [ps]
--------+----------------------------------------------------+------------------------------
cou 76| -2 0 3 -3 -9 127 -.15 42 42 | 0 0 --- 6616
emu 46| 0 0 2 -101 39 -15 .11 22 20 | 976 -763 --- 0
esu 40| -1 1 -1 -4 -73 6 .21 47 47 | 2642 -208 --- 1779
gou 80| 1 0 -4 76 -31 -16 -.09 28 28 | 931 532 --- 10560
siu 62| 2 -1 0 326 150 -519 -.09 121 118 | 0 0 --- 0
usu 32| 4 -3 5 15 277 436 -.03 186 154 | 201 173 --- 2061
Table 2: Daily fit for each satellite and each centre resulting from weighted
average combination.
The last column gives the IGU resulting satellite accuracy measures
found in the IGS SP3 header. Eclipsing satellites are flagged with
"E" (or "M" for moon) beside the PRN number. "X" stands for excluded
from RMS, WRMS and MEDI-combination statistics but included in IGU
Units: mm
Table 2.1466.2 GPS week: 1466 Day: 2 MJD: 54508.750
Weighted Average
PRN | cou emu esu gou siu usu IGU |
------+------------------------------------+
1 | 30 13 57 19 237 131 26 |
2 | 41 18 22 21 95 218 22 |
3 | 48 19 31 21 101 186 21 |
4 | 46 13 26 22 69 148 17 |
5 | 39 13 40 18 60 138 16 |
6 | 36 13 45 19 102 104 17 |
8 | 35 22 37 36 155 130 22 |
9 | 34 19 27 19 99 243 23 |
10 | 36 20 59 21 81 174 21 |
11 | 49 25 85 27 146 99 25 |
12E | 51 47 68 48 116 124 26 |
13 | 40 15 38 33 62 132 17 |
14 | 34 14 29 30 103 134 18 |
15 | 41 29 29 32 170 578 23 |
16E | 49 15 68 32 79 117 21 |
17 | 56 16 48 22 80 210 23 |
18 | 41 17 31 21 56 142 16 |
19 | 68 13 30 24 58 231 24 |
20 | 28 16 57 47 129 93 21 |
21 | 56 25 28 37 52 169 21 |
22 | 38 13 35 21 52 119 15 |
23 | 35 19 22 35 132 129 19 |
24 | 35 11 49 23 130 158 21 |
25 | 35 26 24 22 106 180 20 |
26 | 31 29 53 23 147 98 21 |
27 | 35 28 25 21 75 214 21 |
28E | 33 18 51 35 238 144 28 |
X29 | ---- --- --- --- --- --- 0 |
30 | 39 42 86 23 109 118 24 |
31 | 37 17 63 26 165 94 22 |
X32 | ---- --- --- --- --- --- 0 |
------+------------------------------------+
RMS | 42 22 47 28 121 186 |
WRMS | 42 20 47 28 118 154 |
MEDI | 38 18 38 23 102 138 |
Table 3: Earth Orientation Parameters daily summary.
Daily Centre ERP, ERP Rates and LOD differences with respect to
IGU combined values.
Xpole,Xrt: x pole and x pole rate
Ypole,Yrt: y pole and y pole rate
LOD: Length Of Day
AC LOD BIAS: 21-day mean LOD bias with respect to Bulletin A
AC LOD BIAS RMS: RMS of AC LOD BIAS
FLAG: "u" (used), "x" (excluded), "-" (no submission)
for Xpole, Ypole, Xrt, Yrt and LOD
A star ("*") beside the AC name indicates that AC LOD values were
derived from AC UT1-UTC values.
Remark: COU submits ERP-products for 00 and 12 UT only,
for 06 and 18 UT extrapolations are used.
Table 3.1466.2 GPS week: 1466 Day: 2 MJD: 54508.250
AC LOD AC LOD
CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS
| [uas] [uas] [uas/d] [uas/d] [us]| [us] [us]
------------+----------------------------------------+------------------
cou uuuuu | 46 -87 237 43 -3 | 17 25
emu uuuuu | -22 90 10 154 -12 | -7 21
esu* uuuuu | 117 -56 -246 -257 -10 | -15 108
gou uuuuu | -21 15 1 31 11 | -11 28
siu uuuuu | -105 -216 -223 -589 44 | 55 63
usu uuuuu | -315 -9 147 -9 2 | -7 19
Table 3.1466.3 GPS week: 1466 Day: 3 MJD: 54509.250
AC LOD AC LOD
CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS
| [uas] [uas] [uas/d] [uas/d] [us]| [us] [us]
------------+----------------------------------------+------------------
cou uuuuu | 124 438 -143 -213 134 | 17 25
emu uuuuu | -121 138 -48 198 190 | -7 21
esu* uuuuu | -39 -68 -548 -328 146 | -15 108
gou uuuuu | 167 -295 463 101 35 | -11 28
siu uuuuu | -490 -650 -308 -93 77 | 55 63
usu uuuuu | -137 98 232 47 -250 | -7 19