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 1575 Day: 0 Hour: 12 (Mar 14, 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:
igu15750_12.sp3 IGR GPS ephemeris in SP3 format.
igu15750_12.erp Earth Rotation Parameters (ERP) and their rates as well as
Universal Time (UT1-UTC) and Length Of Day (LOD) associated
with IGS ephemerides.
igu15750_12.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 1.1575.0 GPS week: 1575 Day: 0 MJD: 55269.500
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 -1 3 148 -19 15 -.22 43 39 | -189 481 --- 4581
emu 48| 0 0 -1 -67 127 131 -.28 39 38 | 0 0 --- 461
esu 95| 0 0 -1 -6 -20 -89 .40 21 20 | -373 -267 --- 964
gfu 69| 3 -2 4 61 -140 -502 -.37 85 85 | 1207 -1712 --- 2013
gou 88| 0 1 2 -15 -72 0 -.27 28 29 | -741 2864 --- 29250
siu 63| 0 3 0 -538 107 596 -.28 155 136 | 0 0 --- 0
usu 32| 4 0 3 63 291 94 -.22 231 100 | 56 -83 --- 1097
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 2.1575.0 GPS week: 1575 Day: 0 MJD: 55269.500
Weighted Average
PRN | cou emu esu gfu gou siu usu IGU |
------+-----------------------------------------+
X1 | ---- --- --- --- --- --- --- 0 |
2 | 52 64 14 123 23 94 72 21 |
3 | 39 24 12 111 15 52 162 12 |
4 | 38 64 35 92 21 108 63 23 |
5 | 43 45 30 95 33 108 62 21 |
6 | 38 25 15 119 17 70 100 13 |
7 | 37 29 16 65 20 120 184 14 |
8 | 32 53 19 51 18 247 865 17 |
9 | 35 38 18 47 43 363 78 19 |
10 | 55 35 15 94 27 66 224 18 |
11 | 42 30 25 116 27 93 68 17 |
12 | 42 26 21 82 46 138 31 19 |
13 | 32 38 15 61 19 90 683 14 |
14 | 34 35 19 91 20 118 44 15 |
15 | 44 43 31 50 36 65 30 21 |
16 | 44 29 25 77 28 130 86 17 |
17 | 54 52 16 105 23 118 106 19 |
18 | 38 35 20 90 28 70 38 16 |
19 | 90 26 17 146 45 93 245 25 |
20 | 34 37 24 55 29 76 121 17 |
21 | 44 39 14 90 19 115 136 16 |
22 | 34 50 24 75 30 86 50 19 |
23 | 42 38 16 74 26 100 151 16 |
24 | 45 31 15 83 23 58 200 15 |
26 | 35 32 25 49 33 97 46 17 |
27 | 34 42 15 46 38 463 91 18 |
28 | 38 40 20 63 18 185 201 16 |
29 | 39 32 16 75 24 201 55 15 |
30 | 32 24 17 59 23 90 39 13 |
31 | 32 35 17 84 24 80 57 15 |
32 | 36 45 23 82 20 119 53 17 |
------+-----------------------------------------+
RMS | 43 39 20 85 28 154 231 |
WRMS | 39 38 20 85 29 136 99 |
MEDI | 38 35 17 82 24 97 78 |
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 3.1575.0 GPS week: 1575 Day: 0 MJD: 55269.000
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 | -223 -27 81 -218 4 | -2 16
emu uuuuu | -83 56 -189 -46 -34 | -1 17
esu uuuuu | 20 -44 105 188 11 | 5 14
gfu xxxxx | 125 -100 -3 161 -14 | 13 21
gou uuuuu | 148 40 -61 -135 6 | -3 12
usu xxxxx | -254 -63 -104 47 -43 | -3 12
Table 3.1575.1 GPS week: 1575 Day: 1 MJD: 55270.000
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 | 352 -445 197 -202 -13 | -2 16
emu uuuuu | -379 186 -311 290 -162 | -1 17
esu uuuuu | 119 66 183 18 96 | 5 14
gfu xxxxx | 117 -17 75 -9 0 | 13 21
gou uuuuu | -87 -3 -151 -135 19 | -3 12
usu xxxxx | -417 -66 -286 77 43 | -3 12
This page last updated: 30 Nov 2004
Please send comments about this website to:
IGS Central Bureau.