[IGSMAIL-5462]: IGS Rapid Combination (IGR): 1400 0 (Resubmission)
Gerd Gendt3
igsacc at gfz-potsdam.de
Mon Nov 6 22:19:40 PST 2006
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IGS Electronic Mail 06 Nov 22:20:06 PST 2006 Message Number 5462
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Author: AC Coordinator / GFZ Potsdam
Rapid IGS Orbit Combination - Week 1400 Day: 0 (Nov 05, 2006)
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:
igr14000.sp3 IGR GPS ephemeris in SP3 format.
igr14000.clk IGR GPS satellite and station clocks in RINEX format.
igr14000.cls IGR GPS clock combination summary report.
igr14000.erp Earth Rotation Parameters (ERP) and their rates as well as
Universal Time (UT1-UTC) and Length Of Day (LOD) associated
with IGS ephemerides.
igr14000.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.
Day | Centre | PRN/STA list
----+--------+---------------
0 | EMR | 29
all| ESA | all
all| JPL | all
all| USN | all
5. 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:
Day | Centre | PRN list
----+--------+---------------
0 | SIO | 28
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.
At the same time the absolute antenna model is introduced (IGSMAIL #5272).
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 29-Nov-1998 (GPS Week 986-0; MJD 51146) all IGS clock products
reflect the use of the following antenna phase center offsets
(satellite fixed reference frame):
Block II/IIA: 0.279 0.000 1.023 X, Y, Z in meters
Block IIR : 0.000 0.000 0.000 X, Y, Z in meters
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.
Units: mas, ppb, meters, nano-sec, nano-sec/day.
Table 1.1400.0 GPS week: 1400 Day: 0 MJD: 54044.000
CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS
--------+------------------------------------------------+---------------------
brd n/a| .10 .00 .03 -.24 -2.21 4.93 10.7 1.60 1.60 | .1 -.1 3.38
cod 112| .00 -.00 -.00 -.09 .01 .01 -.2 .02 .02 | -1.3 1.6 .02
emr 35| .00 -.00 -.00 -.03 -.04 -.04 .3 .03 .03 | -46.0 -1.6 .03
esa 40| .00 .00 .02 -.03 .09 -.02 .2 .03 .03 | 1.4 -.1 .10
gfz 94|-.00 .00 -.01 .08 .03 .03 .0 .01 .01 | -.1 .1 .02
iga n/a|-.00 .00 .01 -.01 .02 -.03 -.1 .02 .02 | -1.4 1.9 .14
igu n/a| .00 .00 .00 -.08 .03 -.01 -.3 .05 .04 | -1.3 3.0 3.61
jpl 47|-.00 -.00 .01 .01 -.05 -.04 -.1 .04 .04 | .1 .2 .09
ngs 103| .00 -.00 .01 .05 -.09 .07 -.1 .03 .02 | -.6 .8 2.94
sio 71| .01 .01 -.01 -.30 .17 -.09 -.6 .07 .06 | .0 .0 .0
usn 47|-.00 -.00 -.00 .01 -.03 -.06 .1 .02 .02 | .8 .1 .07
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: cm.
Table 2.1400.0 GPS week: 1400 Day: 0 MJD: 54044.000
Weighted Average
PRN | brd cod emr esa gfz iga igu jpl ngs sio usn IGR |
------+--------------------------------------------------+
1E | 87 2 7 3 2 2 5 3 3 3 3 1 |
2 | 76 2 3 4 1 2 3 5 3 10 2 1 |
3 | 254 2 2 2 1 1 3 2 3 4 2 1 |
4 | 92 2 2 3 1 2 2 1 3 5 2 1 |
5 | 136 1 2 3 1 2 2 2 1 9 2 1 |
6 | 106 2 2 3 1 1 1 3 2 8 2 1 |
7 | 176 2 1 3 1 2 2 1 2 4 1 1 |
8 | 93 1 2 2 1 1 4 2 2 5 1 1 |
9 | 94 1 2 2 1 1 3 1 2 3 2 1 |
10 | 88 2 2 4 1 1 13 2 3 7 2 1 |
11E | 98 2 3 3 2 2 5 6 2 6 3 1 |
13E | 130 2 3 6 1 2 7 5 3 5 2 1 |
14E | 210 2 8 3 2 2 11 7 3 6 2 1 |
15 | 101 2 4 4 2 2 8 2 4 5 3 1 |
16 | 135 1 2 2 1 2 2 5 3 7 1 1 |
17 | 99 2 3 3 1 2 3 5 3 8 2 1 |
18 | 121 2 3 3 2 2 3 6 3 7 3 1 |
19 | 282 2 3 3 2 3 6 5 4 7 2 1 |
20 | 93 3 3 3 2 1 2 5 3 3 4 1 |
21 | 89 2 3 3 2 1 3 5 4 7 2 1 |
22 | 84 2 3 3 2 2 3 6 3 7 2 1 |
23E | 129 2 3 2 2 1 8 6 3 7 2 1 |
24 | 188 1 2 3 1 1 2 2 3 9 2 1 |
25 | 116 1 2 3 1 1 2 2 3 6 1 1 |
26E | 358 2 3 4 2 2 11 2 3 7 3 1 |
27 | 221 1 2 3 1 1 3 3 3 4 2 1 |
28 | 275 2 3 2 1 2 3 5 4 21 2 1 |
X29E | 292 6 5 --- 3 2 61 3 3 7 3 2 |
30 | 112 1 1 3 1 1 2 2 2 8 2 1 |
31 | 135 3 4 4 1 2 4 8 3 6 2 1 |
------+--------------------------------------------------+
RMS | 161 2 3 3 1 2 5 4 3 7 2 |
WRMS | 161 2 3 3 1 2 4 4 2 6 2 |
MEDI | 116 2 3 3 1 2 3 3 3 7 2 |
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: centimetres.
Table 3.1400.0 GPS week: 1400 Day: 0 MJD: 54044.0
CENT| CLK EPO | BRUS | TOW2 | WILL |
----+----------+----------------+----------------+----------------+
cod | cod 2880 | 2 1 4 | 2 2 5 | 1 1 4 |
emr | emr 2847 | 2 3 5 | 2 2 5 | 2 1 4 |
gfz | gfz 2854 | 2 2 5 | 2 2 5 | 1 1 4 |
igr | igr 2869 | 2 2 5 | 2 2 5 | 1 1 3 |
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 (10**-5")
Ypole,Yrt: y pole and y pole rate (10**-5"/day)
LOD: Length Of Day (us)
AC LOD BIAS: 21-day mean LOD bias with respect to Bulletin A (us)
AC LOD BIAS RMS: RMS of AC LOD BIAS (us)
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 4.1400.0 GPS week: 1400 Day: 0 MJD: 54044.500
AC LOD AC LOD
CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS
------------+------------------------------------+------------------
cod uuuuu | -3 5 16 -10 2 | -8 14
emr uuuuu | 8 -2 -4 22 -4 | 53 58
esa uuuuu | -9 -15 -12 -32 -4 | 34 42
gfz uuuuu | 3 -6 -15 9 -26 | 27 33
iga xxxxx | -6 -2 28 7 20 | -13 26
igu xxxxx | -2 7 -1 -4 -59 | -28 50
jpl uuuuu | 9 8 -66 3 -13 | 24 35
ngs uuuuu | 7 13 11 -20 43 | 10 39
sio uuuuu | -13 26 38 38 -4 | -9 44
usn uuuux | -6 -2 24 7 -58 | 60 69
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