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 1600 Day: 5 Hour: 18 (Sep 10, 2010)
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:
igu16005_18.sp3 IGR GPS ephemeris in SP3 format.
igu16005_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.
igu16005_18.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
less than 3 ACs have submitted results for given satellite(s).
The following table lists the exclusions:
Centre | PRN list
--------+---------------
COU | 1
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 1.1600.5 GPS week: 1600 Day: 5 MJD: 55449.750
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 84| 1 0 1 24 -6 700 -.20 31 31 | 758 -810 --- 4250
esu 110| 0 1 -1 -39 26 -123 .34 22 17 | 278 -388 --- 773
gfu 89| 0 -3 1 72 4 -290 -.19 30 30 | 343 435 --- 2624
gou 101| 0 0 0 -58 -32 -159 -.21 31 34 | 4929 1026 --- 28830
siu 80| 1 1 -1 195 -115 -251 -.12 72 65 | 0 0 --- 0
usu 33| 1 0 1 -191 197 357 -.09 114 112 | 0 0 --- 811
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 2.1600.5 GPS week: 1600 Day: 5 MJD: 55449.750
Weighted Average
PRN | cou esu gfu gou siu usu IGU |
------+------------------------------------+
X1 | ---- --- --- --- --- --- 0 |
2 | 28 17 30 17 37 98 13 |
3 | 42 24 29 20 46 131 17 |
4 | 42 26 27 19 40 187 17 |
5 | 23 13 19 21 105 90 10 |
6 | 39 17 27 22 63 111 15 |
7 | 28 11 29 31 41 94 14 |
8 | 23 16 30 24 90 82 13 |
9 | 31 20 33 19 50 100 15 |
10 | 39 12 19 36 32 91 15 |
11 | 25 13 32 23 36 127 13 |
12 | 27 22 27 28 43 113 15 |
13 | 31 10 30 33 39 132 14 |
14 | 36 12 32 27 131 150 15 |
15 | 21 14 27 29 99 90 13 |
16 | 35 15 22 50 61 95 17 |
17 | 25 12 35 37 65 82 15 |
18 | 30 9 29 42 49 87 16 |
19 | 32 13 32 26 70 159 14 |
20 | 20 13 21 37 153 148 13 |
21 | 22 14 28 26 98 99 12 |
22 | 35 7 20 26 66 117 13 |
23 | 30 15 23 23 44 93 13 |
24 | 26 11 24 27 83 155 12 |
X25 | 52 33 31 --- 222 --- 27 |
26 | 23 15 31 35 50 79 14 |
27 | 39 85 69 51 53 128 39 |
28 | 51 24 25 31 43 95 19 |
29 | 25 16 34 39 71 106 16 |
30 | 31 13 13 25 103 95 12 |
31 | 37 16 30 42 53 98 17 |
32 | 19 9 28 25 44 78 11 |
------+------------------------------------+
RMS | 31 22 30 31 72 114 |
WRMS | 31 17 30 34 65 112 |
MEDI | 30 14 29 27 53 98 |
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 3.1600.5 GPS week: 1600 Day: 5 MJD: 55449.250
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 | -44 12 -147 104 9 | 10 28
esu uuuuu | -39 -17 151 33 -1 | 22 29
gfu uuuuu | 15 -50 51 -243 0 | -1 19
gou uuuuu | 112 80 -183 96 -5 | 6 21
usu xxxxx | -160 200 -197 -50 -24 | 11 26
Table 3.1600.6 GPS week: 1600 Day: 6 MJD: 55450.250
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 | -126 310 99 46 52 | 10 28
esu uuuuu | 84 -4 71 86 -9 | 22 29
gfu uuuuu | 38 -312 -29 -190 -8 | -1 19
gou uuuuu | -58 7 -222 0 -13 | 6 21
usu xxxxx | -364 118 -157 -57 -309 | 11 26
This page last updated: 30 Nov 2004
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