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 1688 Day: 3 Hour: 12 (May 16, 2012)
Contacts: J. Griffiths (jake.griffiths@noaa.gov)
K. Choi (kevin.choi@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 Ultra Rapid Orbit files generated and uploaded into CDDIS @ NASA/GSFC are:
igu16883_12.sp3 IGU GPS ephemeris in SP3 format.
igu16883_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.
igu16883_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.
Starting 3-Feb-2012 (GPS Week 1673, day 5, hour 00; MJD 55959.0), a new
solution from Wuhan University (WHU) is included for comparison only. Starting
27-Feb-2012 (GPS Week 1677, day 1, hour 12; MJD 55984.5), a new solution
from NOAA/National Geodetic Survey (NGU) is included for comparison only.
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 | 24
3. Starting 5-Nov-2006 (GPS Week 1400, day 0, MJD 54044) until 16-Apr-2011
(GPS Week 1631, day 6, MJD 55667) 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. The IGS05 frame is
also the basis for the homogeneously reprocessed IGS products from GPS Weeks
730 to 1459 (1994-2007); see IGSMAIL #6136.
Starting 17-Apr-2011 (GPS Week 1632, day 0, MJD 55668) all IGS products,
are based on the IGS realization of the ITRF2008 reference frame (IGS08).
For more information see IGSMAIL #6354.
4. Starting 5-Nov-2006 (GPS Week 1400, day 0, MJD 54044) until 16-Apr-2011
(GPS Week 1631, day 6, MJD 55667) the absolute antenna model is introduced
(IGSMAIL #5438). The antenna phase center offsets and phase center variations
are given in the file:
ftp://igs.org/igscb/station/general/igs05.atx
These antenna calibrations are also used in the homogeneously reprocessed IGS
products from GPS Weeks 730 to 1459 (1994-2007); see IGSMAIL #6136.
Starting 17-Apr-2011 (GPS Week 1632, day 0, MJD 55668) the absolute antenna
model is updated (IGSMAIL #6255 & #6374) as given in the file:
ftp://igs.org/igscb/station/general/igs08.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 1.1688.3 GPS week: 1688 Day: 3 MJD: 56063.500
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 90| 0 0 4 -4 3 378 -.15 31 19 | -117 1420 --- 5606
emu 44| 0 0 2 29 -90 30 -.11 39 25 | 0 0 --- 802
esu 110| 0 0 0 1 53 -284 .31 28 25 | 346 2559 --- 857
gfu 88| 0 -2 -7 -30 29 -43 .00 44 44 | 2544 1027 --- 5743
gou 96| 0 1 -8 -21 -42 -213 -.15 52 42 | -2841 3358 --- 16050
ngu 176| 0 0 -3 0 35 -325 -.05 60 88 | -303200 173100 --- >>>>>>
siu 77| 3 2 1 -138 -359 200 -.17 131 104 | 0 0 --- 0
usu 26| -1 0 4 173 -61 183 .04 117 118 | -1200 1316 --- 784
whu n/a| 2 -1 -3 829 -2571 18 -.38 100 92 | ------ 3268 --- 5550
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 2.1688.3 GPS week: 1688 Day: 3 MJD: 56063.500
Weighted Average
PRN | cou emu esu gfu gou ngu siu usu whu IGU |
------+---------------------------------------------------+
1 | 34 42 16 24 22 44 116 52 116 14 |
2 | 31 26 21 34 30 67 95 25 84 14 |
3 | 24 22 13 38 22 29 43 42 44 11 |
4 | 19 23 21 30 40 25 187 30 74 13 |
5E | 32 28 13 48 23 42 137 23 60 14 |
6 | 14 27 13 27 21 21 34 55 48 10 |
7 | 10 23 14 48 26 25 85 29 45 12 |
8 | 15 22 12 34 39 34 90 35 117 11 |
9 | 16 25 15 41 29 26 36 47 85 12 |
10E | 20 28 32 25 106 53 297 43 102 23 |
11 | 22 19 15 24 18 56 69 31 92 10 |
12E | 101 116 16 88 81 79 95 58 159 42 |
13 | 9 38 27 36 26 39 72 80 94 14 |
14 | 17 25 16 33 29 24 55 286 64 11 |
15 | 9 28 20 36 19 49 46 51 60 11 |
16E | 52 91 98 85 115 137 90 239 273 44 |
17 | 19 31 18 38 20 30 88 278 85 12 |
18E | 17 28 19 40 31 40 86 54 58 13 |
19 | 11 19 15 26 30 37 40 44 93 9 |
20E | 12 44 18 21 39 45 136 27 78 14 |
21 | 32 23 18 31 27 36 119 29 84 13 |
22E | 17 23 17 38 32 33 74 29 60 12 |
23 | 11 35 37 50 32 48 67 88 45 16 |
X24 | ---- --- --- --- --- --- --- --- --- 0 |
25E | 14 37 24 74 55 30 69 30 38 20 |
26 | 16 20 12 47 25 33 36 41 40 12 |
27 | 12 30 12 44 15 59 43 53 88 11 |
28E | 79 41 53 63 49 200 53 386 208 30 |
29 | 17 32 12 42 32 27 153 42 40 13 |
30E | 42 26 44 25 152 51 243 42 76 33 |
31 | 13 49 16 41 21 41 66 74 115 14 |
32E | 10 25 29 28 79 46 399 71 86 18 |
------+---------------------------------------------------+
RMS | 31 39 28 44 52 60 131 117 100 |
WRMS | 19 25 25 44 42 88 104 118 92 |
MEDI | 17 28 17 38 30 40 85 44 84 |
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: 10-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 3.1688.3 GPS week: 1688 Day: 3 MJD: 56063.000
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 | -28 -38 -52 10 0 | 0 9
emu uuuuu | 93 -22 10 86 4 | 4 13
esu uuuuu | -78 23 60 -89 -2 | 5 17
gfu uuuuu | -10 26 -141 12 -5 | 0 17
gou uuuuu | 92 26 104 33 0 | -1 14
ngu xxxxx | 45 10 161 64 14 | 4 18
usu xxxxx | 74 -142 -108 -83 6 | 0 16
whu xxxxx | 2582 -891 843 192 -19 | -42 65
Table 3.1688.4 GPS week: 1688 Day: 4 MJD: 56064.000
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 | -15 15 152 104 12 | 0 9
emu uuuuu | 224 1 196 -49 -54 | 4 13
esu uuuuu | -52 -59 -63 -82 16 | 5 17
gfu uuuuu | -185 45 -264 19 4 | 0 17
gou uuuuu | 19 44 -162 18 17 | -1 14
ngu xxxxx | 576 210 -13 506 72 | 4 18
usu xxxxx | -27 -204 -51 4 -78 | 0 16
whu xxxxx | 3343 -636 673 255 -21 | -42 65
This page last updated: 30 Nov 2004
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