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 1559 Day: 2 Hour: 00 (Nov 24, 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:
igu15592_00.sp3 IGR GPS ephemeris in SP3 format.
igu15592_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.
igu15592_00.sum Combination summary report.
REMARKS concerning the IGU Orbit Combination:
---------------------------------------------
1. The following centre clock solutions, which provide broadcast and/or
predicted broadcast clock corrections, were excluded from the combination
but kept in the combination statistics:
-> Broadcast Centre: GOU COU
The reference time scale is based on a linear alignment to the clocks
of a particular centre, which is normally pre-aligned to broadcast GPS
time. The reference centre is chosen from the following list, in order
of availability, and is indicated by 0 TOFT, 0 TDRFT, and non-zero RMS
in Table 1:
-> Reference Centre: EMU USU ESU GFU
Starting on 1-Jul-2009 (GPS Week 1538, day 3, hour 12; MJD 55013.5),
clock predictions are excluded for satellites set unhealthy due to MX
or UNUSUFN NANU events. The centre clock statistics in Table 1 do not
include the excluded satellites; however, these are included in the later
IGU center comparison statistics with the IGS Rapid clocks.
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
--------+---------------
EMU | 24
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 | 24
GOU | 24
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 1.1559.2 GPS week: 1559 Day: 2 MJD: 55159.000
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 86| 0 0 -7 -48 48 35 -.13 20 19 | 0 467 --- 5069
emu 49| 1 1 1 -62 -38 3 -.02 41 34 | 0 0 --- 796
esu 95| 1 -1 -1 189 -33 -35 .36 21 22 | -3918 1403 --- 645
gfu 76| 1 1 -2 -75 -67 7 -.14 57 57 | 79470 41260 --- 23420
gou 97| 0 0 12 -102 27 31 -.19 27 27 | -3157 1934 --- 21480
siu 62| 0 0 2 24 -338 -36 -.04 115 69 | 0 0 --- 0
usu 32| 0 0 -4 -134 420 -77 -.05 129 108 | 45 232 --- 2888
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 2.1559.2 GPS week: 1559 Day: 2 MJD: 55159.000
Weighted Average
PRN | cou emu esu gfu gou siu usu IGU |
------+-----------------------------------------+
X1 | ---- --- --- --- --- --- --- 0 |
2 | 20 15 20 29 33 82 94 12 |
3 | 13 17 18 53 20 37 98 11 |
4 | 16 16 25 38 16 43 145 10 |
5E | 12 45 17 49 24 255 45 13 |
6 | 21 32 18 74 17 60 80 14 |
7E | 11 39 21 33 16 48 106 11 |
8E | 29 82 19 131 43 253 114 27 |
9E | 17 66 21 118 44 149 359 24 |
10E | 17 31 23 66 33 202 38 15 |
11 | 29 22 30 40 24 90 174 14 |
12 | 20 21 21 59 30 53 50 14 |
13 | 14 30 28 40 18 42 93 12 |
14 | 24 44 20 47 27 22 39 14 |
15 | 21 32 22 33 25 45 111 12 |
16 | 18 14 32 35 34 80 81 13 |
17 | 13 20 17 28 18 86 42 9 |
18E | 20 77 26 102 27 214 306 23 |
19 | 21 23 19 39 34 52 130 13 |
20E | 16 18 16 47 21 48 50 11 |
21 | 22 28 19 43 19 34 47 12 |
22E | 13 58 20 29 28 131 228 14 |
23 | 17 21 22 42 17 65 53 11 |
X24 | ---- --- --- --- --- --- --- 0 |
X25E | 13 37 26 --- --- 83 --- 17 |
26 | 16 58 25 39 20 90 50 15 |
27E | 35 67 20 26 32 73 90 18 |
28 | 27 17 16 27 41 127 58 13 |
29 | 10 20 16 27 19 45 90 8 |
30 | 21 52 18 47 39 112 94 16 |
31E | 27 33 20 77 18 146 120 16 |
32 | 17 40 22 38 21 90 44 12 |
------+-----------------------------------------+
RMS | 20 41 21 57 27 115 129 |
WRMS | 19 34 22 57 27 69 108 |
MEDI | 17 31 20 40 24 80 90 |
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 3.1559.1 GPS week: 1559 Day: 1 MJD: 55158.500
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 | -48 4 -96 103 1 | -8 19
emu uuuuu | 53 46 -22 221 -10 | -13 23
esu uuuuu | -38 -127 159 -287 -28 | 26 55
gfu uuuuu | 66 58 70 139 4 | 5 14
gou uuuuu | 57 98 -71 11 1 | -8 17
usu xxxxx | -376 70 -178 286 20 | -12 24
Table 3.1559.2 GPS week: 1559 Day: 2 MJD: 55159.500
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 | -22 110 123 137 44 | -8 19
emu uuuuu | 116 210 122 137 49 | -13 23
esu uuuuu | 79 -453 50 -336 80 | 26 55
gfu uuuuu | 95 158 -39 90 -27 | 5 14
gou uuuuu | -175 204 -299 96 -29 | -8 17
usu xxxxx | -548 321 -47 257 140 | -12 24
This page last updated: 30 Nov 2004
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