[IGSMAIL-5567]: IGS Rapid Combination (IGR): 1416 4 (Resubmission)
Gerd Gendt3
igsacc at gfz-potsdam.de
Sat Mar 3 00:05:54 PST 2007
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IGS Electronic Mail 03 Mar 00:06:14 PST 2007 Message Number 5567
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Author: AC Coordinator / GFZ Potsdam
sum-file Version 2.0
Rapid IGS Orbit Combination - Week 1416 Day: 4 (Mar 01, 2007)
Contacts: G. Gendt (gendt at gfz-potsdam.de),
Th. Nischan ( nisn at gfz-potsdam.de)
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:
igr14164.sp3 IGR GPS ephemeris in SP3 format.
igr14164.clk IGR GPS satellite and station clocks in RINEX format.
igr14164.cls IGR GPS clock combination summary report.
igr14164.erp Earth Rotation Parameters (ERP) and their rates as well as
Universal Time (UT1-UTC) and Length Of Day (LOD) associated
with IGS ephemerides.
igr14164.sum Combination summary report.
REMARKS concerning the IGR Orbit Combination:
---------------------------------------------
1. Broadcast ("brd") orbits/clocks are included in the combination for
statistics only. However broadcast clock corrections are used for clock
alignment to GPS time and centre clock weight determination purposes.
2. The following center solutions (orbits/clocks) were excluded from the
combination but kept for statistics:
-> Centre: IGA IGU
3. The following centre clock solutions, which provide broadcast clock
corrections, were excluded from the combination but kept in the
combination statistics:
-> Centre: NGS
4. The following clock solutions were excluded from the combination because
they were biasing the combined clock solutions (clock shifts/outliers)
but were kept for the RMS computation.
All clocks from JPL and USN.
Day | Centre | PRN/STA list
----+--------+---------------
4 | ESA | NKLG NKLG
4 | USN | FAIR NRIL FAIR NRIL FAIR FAIR FAIR
5. The following table lists all maneuvered satellites. The solutions from COD
and ESA, which modeled the maneuver, are used for combination.
An associated accuracy code of 0 (unknown) is given if only one AC is left
(no redundancy).
PRN | Date | Ref. NANU
----+------------+----------
G24 | 2007_03_01 | 2007031
G24 | 2007_03_02 | 2007031
6. 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.
7. Starting on 5-Nov-2000 (GPS Week 1087-0; mjd=51853) all IGS clock products
are based on the new clock combination scheme which uses the the clock
RINEX files as input if available, otherwise SP3 clocks are used.
The navigation solution is still based on the SP3 clocks but this will
soon adopt the clock RINEX files as well.
8. 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 IGR orbit
and clocks (iga is the 24h adjusted part of Ultra Rapid,
igu is the 24h predicted part of Ultra Rapid).
WRMS - RMS weighted by the centres SP3 header accuracy codes.
STA - Number of stations in the daily solutions.
Table 1.1416.4 GPS week: 1416 Day: 4 MJD: 54160.000
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]
--------+----------------------------------------------------+------------------------------
brd n/a| -1 22 -31 -606 -961 -1715-27.77 911 911 | 217 183 3011 4488
cod 113| 3 -1 -3 3 20 65 -.34 18 18 | 480 -697 41 91
emr 38| 3 -3 2 22 -9 -48 .33 23 23 | -185732 0 92 183
esa 40| 0 -1 2 80 -112 -39 .09 26 26 | 9490 1698 66 152
gfz 93| -3 2 0 4 2 -53 .05 11 11 | -185648 355 57 133
iga n/a| 2 0 0 75 -52 59 -.10 13 13 | -11021 16086 57 162
igu n/a| 0 1 -6 -206 315 460 -.06 43 43 | 801 -1734 2176 4264
jpl 47| -6 1 3 9 -75 23 -.03 50 44 | 9039 1919 87 128
ngs 98| 1 0 4 -44 97 60 -.02 22 19 | 235 164 2869 4215
sio 70| 4 0 -8 29 -31 -48 .03 49 46 | 0 0 0 0
usn 46| 0 -1 0 -85 -46 59 .03 25 20 | 7343 1893 85 2017
Table 2: Daily fit for each satellite and each centre resulting from weighted
average combination.
The last column gives the IGR 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 2.1416.4 GPS week: 1416 Day: 4 MJD: 54160.000
Weighted Average
PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR |
------+-------------------------------------------------------------+
1 | 1050 16 17 21 13 9 34 17 32 42 19 7 |
2 | 172 15 23 29 10 11 32 77 22 63 27 10 |
3 | 767 15 14 28 11 22 91 35 19 39 16 7 |
4 | 607 15 19 28 9 10 43 37 15 51 28 7 |
5 | 688 14 21 23 13 10 18 17 23 38 25 7 |
6 | 761 17 13 17 12 9 25 21 20 37 16 6 |
7 | 1024 17 18 21 11 12 26 20 19 49 16 7 |
8 | 755 13 22 29 8 13 41 28 14 72 26 8 |
9 | 1084 17 17 26 10 6 15 19 18 47 18 7 |
10 | 852 17 19 26 14 10 18 21 18 46 17 7 |
11 | 875 22 25 22 11 14 55 54 26 40 29 9 |
12 | 349 19 24 26 13 10 73 63 36 39 35 10 |
13 | 1059 20 33 28 9 10 61 67 17 42 29 9 |
14 | 799 15 24 26 12 17 59 49 23 34 22 8 |
X15 | 627 27 38 --- --- 22 53 41 17 --- --- 17 |
16 | 1345 19 24 31 11 8 35 73 25 37 25 9 |
17 | 516 19 30 28 14 16 27 78 23 56 29 10 |
18 | 822 17 21 33 12 12 47 60 27 38 24 9 |
19 | 1573 22 32 26 13 15 42 79 21 42 21 10 |
20 | 751 19 25 27 13 13 43 69 25 43 35 10 |
21 | 1161 20 17 28 10 10 35 59 16 86 28 10 |
22 | 404 18 26 29 11 11 51 52 23 40 29 9 |
23 | 1237 15 26 25 10 13 29 60 18 50 22 8 |
X24 |>>>>> 7 --- --- --- 22 >>>> --- --- --- --- 0 |
25 | 945 14 23 19 7 13 19 28 16 35 23 6 |
26 | 593 17 25 25 9 9 36 21 21 77 13 8 |
27 | 1054 11 21 20 7 14 38 33 16 38 26 6 |
28 | 1100 16 27 27 11 13 51 66 19 71 27 10 |
X29 | 1917 16 25 --- 13 21 84 24 23 --- 23 8 |
30 | 1004 16 15 21 13 9 20 17 16 33 20 6 |
31 | 730 27 34 34 14 22 31 46 29 25 33 10 |
------+-------------------------------------------------------------+
RMS | 911 18 23 26 11 13 43 50 22 49 25 |
WRMS | 911 18 23 26 11 13 43 44 19 46 20 |
MEDI | 852 17 23 26 11 12 38 41 20 42 25 |
Table 3: Daily Precise Navigation Summary using the corresponding Centre orbit
positions and satellite clock corrections at 15 min intervals.
Each line gives the daily station RMS w.r.t. the estimated coordinates
for the Latitude, Longitude and Height components.
CLK - Satellite clocks used.
EPO - Number of satellite clock epochs available for that day.
Units: mm
Table 3.1416.4 GPS week: 1416 Day: 4 MJD: 54160.0
CENT| CLK EPO | BRUS | TOW2 | WILL |
----+----------+-------------------+-------------------+-------------------+
cod | cod 2931 | 19 15 32 | 16 16 60 | 27 14 35 |
emr | emr 2835 | 17 16 29 | 14 21 61 | 15 11 32 |
esa | esa 2688 | 21 12 43 | 16 21 58 | 13 13 31 |
gfz | gfz 2775 | 15 6 40 | 17 23 65 | 15 11 37 |
igr | igr 2859 | 12 12 35 | 15 21 73 | 16 17 43 |
jpl | jpl 2849 | 15 9 32 | 15 24 77 | 12 16 34 |
Table 4: Earth Orientation Parameters daily summary.
Daily Centre ERP, ERP Rates and LOD differences with respect to
IGR 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.
Table 4.1416.4 GPS week: 1416 Day: 4 MJD: 54160.500
AC LOD AC LOD
CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS
| [uas] [uas] [uas/d] [uas/d] [us]| [us] [us]
------------+----------------------------------------+------------------
cod uuuuu | -31 -25 -69 48 0 | -8 17
emr uuuuu | 63 -75 212 44 -17 | 83 87
gfz uuuuu | 37 -11 -148 23 -2 | 29 43
iga xxxxx | 58 -67 -18 -97 31 | -6 28
igu xxxxx | -328 254 -719 500 50 | -45 69
jpl uuuuu | 124 61 -298 -82 -8 | -12 22
ngs uuuuu | -190 181 279 128 -13 | -31 58
sio uuuuu | 4 -66 17 -499 -5 | 11 44
usn uuuuu | 76 -86 59 -167 49 | 25 44
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