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 1487 Day: 3 Hour: 06 (Jul 09, 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:
igu14873_06.sp3 IGR GPS ephemeris in SP3 format.
igu14873_06.erp Earth Rotation Parameters (ERP) and their rates as well as
Universal Time (UT1-UTC) and Length Of Day (LOD) associated
with IGS ephemerides.
igu14873_06.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
--------+---------------
SIU | 10
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 1.1487.3 GPS week: 1487 Day: 3 MJD: 54656.250
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 123| 1 -1 1 -28 44 -80 -.15 43 42 | 0 0 --- 7173
emu 44| 0 0 0 99 -10 -35 -.06 17 16 | -266 290 --- 639
esu 95| 0 1 -2 -56 15 -114 .28 29 27 | -7645 334 --- 936
gfu 65| 0 0 2 -29 -82 275 -.04 41 41 | -1008 2607 --- 6548
siu 62| 0 0 0 -142 -60 3 -.26 119 78 | 0 0 --- 0
usu 33| 1 0 1 -193 132 -23 -.06 84 88 | -270 -94 --- 1301
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 2.1487.3 GPS week: 1487 Day: 3 MJD: 54656.250
Weighted Average
PRN | cou emu esu gfu siu usu IGU |
------+------------------------------------+
2 | 20 10 34 44 93 152 22 |
3 | 101 21 33 60 81 57 24 |
4 | 16 17 22 49 111 142 22 |
5E | 56 17 36 68 55 78 20 |
6 | 42 12 22 50 30 60 14 |
7 | 27 10 23 31 34 51 11 |
8 | 37 25 19 30 82 120 19 |
9 | 18 16 20 33 53 62 12 |
10E | 24 36 32 24 348 134 23 |
11 | 57 9 22 71 81 50 18 |
12 | 17 11 14 23 128 59 15 |
13 | 32 13 25 28 84 59 14 |
14 | 20 9 43 30 93 74 16 |
15 | 43 26 17 29 279 68 30 |
16 | 24 9 31 49 102 159 23 |
17 | 17 11 49 39 105 91 19 |
18E | 34 7 16 30 26 70 12 |
19 | 25 12 29 23 50 97 15 |
20E | 15 10 49 48 123 94 20 |
21 | 29 19 25 45 87 47 15 |
22E | 15 9 22 23 70 76 13 |
23 | 20 12 20 30 94 59 14 |
24 | 26 13 28 54 154 77 21 |
25 | 11 20 31 40 71 46 14 |
26 | 67 13 17 30 170 60 22 |
27 | 20 22 26 30 31 68 13 |
28 | 59 31 33 21 40 53 17 |
29 | 77 17 25 50 38 55 18 |
30E | 104 14 24 51 138 81 26 |
31 | 13 18 37 21 51 64 13 |
32E | 38 10 35 31 109 72 17 |
------+------------------------------------+
RMS | 43 17 29 41 118 84 |
WRMS | 42 16 27 41 78 88 |
MEDI | 26 13 25 31 84 68 |
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 3.1487.2 GPS week: 1487 Day: 2 MJD: 54655.750
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 | -71 41 -121 13 9 | 11 21
emu uuuuu | 25 -80 -41 -64 5 | 4 18
esu uuuuu | -34 -2 252 31 7 | -2 28
gfu uuuuu | 91 71 -23 72 1 | 16 28
siu uuuuu | 28 86 -124 184 -27 | 24 57
usu uuuuu | -102 210 -130 -1 -5 | 0 12
Table 3.1487.3 GPS week: 1487 Day: 3 MJD: 54656.750
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 | -171 244 -78 120 101 | 11 21
emu uuuuu | -35 -70 -78 119 70 | 4 18
esu uuuuu | 228 -118 274 -228 -55 | -2 28
gfu uuuuu | 78 -4 -1 -187 85 | 16 28
siu uuuuu | -70 258 -72 165 81 | 24 57
usu uuuuu | -232 110 -148 -20 -72 | 0 12
This page last updated: 30 Nov 2004
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