The "REMARKS" section will note if any satellites were not included in the combined solution, due to too few analysis centers providing a solution. Any satellites which have no prediction provided due to a maneuver will also be listed.
Table 2 shows which satellites were eclipsing, the sp3 orbit accuracy code for each PRN, and whether any analysis centers did not provide a solution for any satellites.
This page is designed for humans to read, to check on how the latest UltraRapid analysis went. To obtain UltraRapid products for operational and/or automated use, please see the IGS product table.
Author: AC Coordinator / NOAA NGS
sum-file Version 2.0
Ultra Rapid IGS Orbit Combination - Week 1523 Day: 1 Hour: 00 (Mar 16, 2009)
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:
igu15231_00.sp3 IGR GPS ephemeris in SP3 format.
igu15231_00.erp Earth Rotation Parameters (ERP) and their rates as well as
Universal Time (UT1-UTC) and Length Of Day (LOD) associated
with IGS ephemerides.
igu15231_00.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
--------+---------------
GFU | 23 26
SIU | 16 26
3. 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.
4. 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 1.1523.1 GPS week: 1523 Day: 1 MJD: 54906.000
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 84| 0 0 0 -89 13 -142 -.15 30 23 | -147 50 --- 6433
emu 45| 0 0 0 78 -62 -35 -.06 25 21 | 0 0 --- 1079
esu 95| -2 0 0 -12 72 90 .29 22 21 | -314 1517 --- 19
gfu 66| 0 1 11 -83 114 -457 .05 124 48 | -336 509 --- 954
gou 72| 1 -1 0 -17 -24 168 -.18 34 27 | -4479 110 --- 34880
siu 60| 0 0 -2 7 31 54 -.11 124 63 | 0 0 --- 0
usu 35| -1 -1 -2 94 43 167 -.01 92 81 | -767 1835 --- 1220
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 2.1523.1 GPS week: 1523 Day: 1 MJD: 54906.000
Weighted Average
PRN | cou emu esu gfu gou siu usu IGU |
------+-----------------------------------------+
2 | 23 21 17 55 29 88 61 13 |
3 | 84 36 24 51 31 75 159 23 |
4 | 27 20 16 41 35 100 78 14 |
5 | 22 21 21 42 18 59 95 13 |
6E | 38 31 22 124 61 170 141 26 |
7 | 24 23 14 59 21 89 56 13 |
8 | 12 24 18 22 19 40 81 10 |
9 | 18 19 21 31 15 212 61 20 |
10 | 27 17 15 41 31 26 58 10 |
11 | 30 25 23 59 20 90 67 14 |
12 | 24 24 20 45 19 64 68 12 |
13E | 41 22 24 88 95 31 46 21 |
14E | 22 41 25 131 32 118 115 22 |
15E | 46 39 36 118 25 120 63 21 |
16 | 29 20 26 61 26 304 46 13 |
17E | 21 16 30 48 23 131 71 16 |
18 | 17 20 17 46 15 81 79 12 |
19E | 35 18 18 39 24 63 49 12 |
20 | 24 16 16 68 23 104 63 14 |
21 | 26 20 17 42 19 51 54 10 |
22 | 22 17 18 52 19 81 66 12 |
23E | 30 31 33 483 18 66 67 15 |
24 | 24 16 22 50 35 42 108 14 |
25 | 14 19 16 30 20 37 54 9 |
26E | 18 56 34 363 72 350 149 28 |
27 | 18 26 18 27 20 175 53 17 |
28 | 28 21 26 50 23 90 82 14 |
29E | 25 27 23 43 46 93 232 24 |
30 | 20 23 21 41 17 29 110 13 |
31 | 25 19 21 65 19 71 91 14 |
32 | 19 14 16 45 28 24 50 10 |
------+-----------------------------------------+
RMS | 30 25 22 124 34 124 92 |
WRMS | 23 21 21 48 27 63 81 |
MEDI | 24 21 21 50 23 81 67 |
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 3.1523.0 GPS week: 1523 Day: 0 MJD: 54905.500
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 | -50 59 74 88 1 | 6 23
emu uuuuu | 22 -53 173 -138 14 | 17 32
esu uuuuu | 5 15 -235 -10 -31 | 29 103
gfu uuuuu | -41 66 -226 -20 10 | -22 32
gou uuuuu | 29 -15 107 37 -9 | -1 23
siu uuuuu | 55 17 76 416 -6 | 74 87
usu uuuuu | -50 -109 14 -89 -6 | 11 36
Table 3.1523.1 GPS week: 1523 Day: 1 MJD: 54906.500
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 | 104 31 213 -168 62 | 6 23
emu uuuuu | 231 -194 224 -167 50 | 17 32
esu uuuuu | -240 68 -276 91 -204 | 29 103
gfu uuuuu | -278 109 -267 81 3 | -22 32
gou uuuuu | 33 53 -27 106 -8 | -1 23
siu uuuuu | 92 209 79 284 104 | 74 87
usu uuuuu | -41 -81 13 232 -198 | 11 36
This page last updated: 30 Nov 2004
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