[IGSREPORT-15534] Wk 1445 IGLOS Final Orbits
Gerd Gendt3
igsacc at gfz-potsdam.de
Thu Oct 4 05:03:47 PDT 2007
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IGS Electronic Report 04 Oct 05:03:59 PDT 2007 Message Number 15534
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Author: AC Coordinator / GFZ Potsdam
sum-file Version 2.0
IGLOS Orbit Combination - Week 1445 (Sep 16, 2007 - Sep 22, 2007)
Contact: Gerd Gendt (gendt at gfz-potsdam.de)
Thomas Nischan ( nisn at gfz-potsdam.de)
COMBINATION STRATEGY:
---------------------
Ephemeris are combined as weighted averages computed over all centres.
Each centre and satellite is given a position weight computed from the centers
absolute deviation to the unweighted average orbit after removing small
differences in the reference frames. These weights were applied in a
second iteration to estimate Helmert transformation parameters for each
center. Finally the transformation parameters with respect to the combined
solution and the RMS of the fit are reported in Tables 2.1445.
For long arc computations the Earth Orientation Parameters (EOPs) are fixed to
the values of the final IGS (GPS) combination.
SOFTWARE:
---------
The weighted average software used was originally developed by T. Springer
and G. Beutler in 1993. The GPS long arc orbit analysis software used here for
individual centre ephemeris evaluation was developed by Beutler et al. at the
Astronomical Institute of the University of Bern (AIUB). For more details on
the orbit combination and complete references for both software see:
Beutler G., Kouba J. and T. Springer, 1995, Combining the orbits of the IGS
Analysis Centers, Bulletin Geodesique, 69, pp 200-222.
Kouba J., Mireault Y. and F. Lahaye, 1995, 1994 IGS Orbit/Clock Combination
and Evaluation, Appendix I of the Analysis Coordinator Report, International
GPS Service for Geodynamics (IGS) 1994 Annual Report, pp. 70-94.
Kouba J. and Y. Mireault, 1996, IGS Analysis Coordinator Report,
International GPS Service for Geodynamics (IGS) 1995 Annual Report,
pp. 45-76.
Kouba J. and Y. Mireault, 1997, Analysis Coordinator Report,
International GPS Service for Geodynamics (IGS) 1996 Annual Report,
pp. 55-100.
Weber R., 2000, IGS Technical Report 1999
PRODUCTS GENERATED:
-------------------
The combined IGL-ephemerides are written to daily files in the SP3-format.
The satellite accuracy codes in the header are based on the weighted rms.
for each satellite. Note, that the result files contain all satellites
that were analysed by at least one center. We refer to the 'REMARKS' section
below, in case a satellite or center was excluded from the combination.
The following naming convention is used for the result files:
igl1445[0-6].sp3 IGLOS-PP Glonass ephemerides files for days 0-6
of GPS Week 1445 in the SP3 format.
igl14457.sum Combination Report for GPS Week 1445.
REMARKS concerning the IGL Orbit Combination:
---------------------------------------------
1. Broadcast (brd) orbits and clocks are included in the combination for
statistics only.
2. Having only a few satellites the mcc orbits are included in the combination
for statistics only.
3. Starting on 01-May-2005 (GPS Week 1321; MJD 53491)[IGSMAIL-5151]
BKG, ESA, and CODE will start to refer their GLONASS orbit products
to the following satellite antenna offset (SAO) values:
X/Y/Z = 0.000/0.000/0.000 meter for GLONASS and
X/Y/Z = -0.545/0.000/0.000 meter for GLONASS-M SVs.
4. The satellite clock values in the combined orbit files are taken from the
broadcast files. The following gps/glonass time offsets derived from the
bkg summary files were added to the broadcast clocks.
Day | applied clock offset
----+---------------------
0 | 1228.7 ns
1 | 1266.0 ns
2 | 1272.7 ns
3 | 1232.7 ns
4 | 1235.7 ns
5 | 1260.9 ns
6 | 1217.7 ns
5. The following orbit solutions were excluded from the combination
because they were biasing the weighted average (generally indicated
by long arc RMS).
Day | Centre | PRN list
----+--------+---------------
0 | COD | R15 R21
0 | ESX | R02 R03 R04 R08 R10 R14 R18 R19 R21 R23
1 | COD | R15 R21
1 | ESX | R02 R03 R08 R10 R14 R18 R19 R21 R23
2 | COD | R15
2 | ESX | R02 R03 R10 R14 R18 R19 R21 R24
3 | COD | R15 R21
3 | ESX | R02 R03 R08 R10 R14 R18 R19 R21 R24
4 | COD | R15
4 | ESX | R10 R14 R18 R19 R24
5 | COD | R15
5 | ESX | R10 R14 R21
6 | COD | R15
6 | ESX | R10 R14 R24
ORBIT COMBINATION AND EVALUATION STATISTICS:
--------------------------------------------
Table 1 summarizes all statistics for the week. It contains means and standard
deviations over the week of satellite ephemeris and clock correction
transformation parameters for each centre (Tables 1.1445, 1a.1445).
Table 2 contains the complete ephemeris and clock correction transformation
parameters (includes both the apriori and a posteriori values) for each
centre and each day (Tables 2.1445.0-6)
Table 3 contains two types of daily RMS for each satellite and centre, along
with the computed satellite position sigmas for the combined orbits
(tables 3.1445.0-6).
The first type of satellite RMS is based on orbit combination and the
second RMS type is a result of the 7-day arc evaluation of each centre
ephemerides.
Table 1: Week 1445 summary. (Sep 16, 2007 - Sep 22, 2007)
Table 1.1445.a GPS week : 1445 MJD: 54359.0-54365.0
Mean and standard deviations of transformation parameters to the
combined IGL orbit.
WRMS - orbit RMS weighted by the SP3 header accuracy codes.
STA - Mean number of stations in the daily solutions.
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]
--------+----------------------------------------------------+------------------------------
bkg 55| 1 0 2 35 23 -125 -.03 69 48 | 0 648 3878 4221
| 7 8 14 68 119 159 .19 | 0 1488
cod 173| 0 -1 -3 -15 -15 66 -.04 58 34 | --- --- --- ---
| 2 7 13 44 70 160 .16 | --- ---
esx 42| -6 -2 0 -98 25 434 -.31 3433 111 | 1902268 41517 11498 23076
| 16 10 21 238 240 343 .46 | 1119053 26740
iac n/a| 3 2 2 8 18 -149 .20 58 58 | 1244551 2680 11245 22982
| 1 4 7 96 93 183 .13 | 22753 10616
Table 1.1445.b GPS week : 1445 MJD: 54359.0-54365.0
Satellite position sigmas for the combined orbits
(coded in the IGS SP3 orbit files).
"E" flags eclipsing satellites.
Units: mm.
Day of GPS week
PRN | 0 1 2 3 4 5 6 | Remarks
------+------------------------------------+------------------------------------------
R01 | 31 20 25 31 29 33 31 |
R04 | 21 37 30 28 17 26 29 |
R06 | 19 21 28 27 40 43 39 |
R07 | 33 18 15 28 18 19 25 |
R08 | 29 37 34 30 29 59 33 |
R10 | 20 24 15 15 23 27 16 |
R14 | 37 24 19 32 34 32 23 |
R21E | --- --- 0 --- 161 71 55 |
R23E | 1692 520 155 0 73 52 45 |
R24E | 131 112 142 --- --- 0 0 |
Table 1.1445.c GPS week : 1445 MJD: 54359.0-54365.0
Daily transformation of broadcast orbits (brd) to the combined IGL orbit.
Mean and standard deviations of the transformation parameters for the
whole gpsweek.
CEN WEEK DAY | DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT
| [mm] [mm] [mm] [uas] [uas] [uas] [ppb] [mm] [mm] | [ps] [ps/d]
-------------+------------------------------------------------------------+----------------
brd 1445 0 | 391 107 -521 202 9310 -366500 78.0 5686 5686 | 1228697 0
brd 1445 1 | -106 -146 -413 -1152 5337 -376100 111.8 6091 6091 | 1265955 0
brd 1445 2 | 602 -52 -76 7771 -2183 -344900 98.0 8534 8534 | 1272728 0
brd 1445 3 | 173 -158 -257 2893 -545 -346400 94.9 4051 4051 | 1232733 0
brd 1445 4 | 1267 3754 273 4554 -4997 -254600 95.6 9795 9795 | 1235708 0
brd 1445 5 | 286 168 844 -2402 4685 3255 90.0 3130 3130 | 1260914 0
brd 1445 6 | 128 -2 597 4411 823 751 99.4 3037 3037 | 1217686 0
-------------+------------------------------------------------------------+----------------
brd 1445 mean| 391 524 63 2325 1775 -240641 95.4 5760 5760 | 1244917 0
brd 1445 sdev| 444 1429 521 3611 4928 170389 10.2 2624 2624 | 21251 0
Table 2: Daily transformation of each centre to the combined IGL orbit and
clocks for each day of the week. The transformation displayed is the
sum of a priori and estimated transformations.
WRMS - RMS weighted by the centres SP3 header accuracy codes.
STA - Number of stations in the daily solutions.
Table 2.1445.0 GPS week: 1445 Day: 0 MJD: 54359
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]
--------+----------------------------------------------------+------------------------------
bkg 55| -1 4 -12 0 121 -30 -.05 58 39 | 0 16 4011 4478
cod 173| 2 0 13 17 17 -72 -.20 85 34 | --- --- --- ---
esx 42| -35 -12 -21 -45 -426 893 .38 1326 171 | 2290175 51836 8876 18278
iac n/a| 2 7 0 -98 148 -36 .08 90 90 | 1231851 -1446 9803 19645
Table 2.1445.1 GPS week: 1445 Day: 1 MJD: 54360
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]
--------+----------------------------------------------------+------------------------------
bkg 55| -8 -12 3 84 166 71 -.13 78 39 | 0 -15 2446 2601
cod 173| -2 13 -19 0 -21 89 -.19 75 37 | --- --- --- ---
esx 42| 4 1 12 -302 -117 163 -.00 268 81 | 2421242 51456 6874 19313
iac n/a| 2 -5 8 -9 38 -163 .24 54 54 | 1268493 -2764 6680 18762
Table 2.1445.2 GPS week: 1445 Day: 2 MJD: 54361
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]
--------+----------------------------------------------------+------------------------------
bkg 55| 8 6 13 -95 -203 -421 -.17 112 46 | 0 3749 5252 5783
cod 173| 1 -6 -22 -8 68 -168 .23 94 35 | --- --- --- ---
esx 42| -15 -3 22 134 146 821 -.50 >>>> 77 | 2449409 43405 13055 30418
iac n/a| 4 3 -7 -18 -32 -28 .08 49 49 | 1279431 -12967 13278 28617
Table 2.1445.3 GPS week: 1445 Day: 3 MJD: 54362
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]
--------+----------------------------------------------------+------------------------------
bkg 55| -4 -2 -17 49 -30 -75 .15 40 36 | 0 -151 4446 4967
cod 173| 1 0 3 49 19 -27 .07 36 38 | --- --- --- ---
esx 42| 19 16 19 -476 224 578 -1.10 291 164 | 2418583 53422 12440 34729
iac n/a| 0 3 13 -66 -104 88 .22 37 37 | 1222908 2441 12748 33480
Table 2.1445.4 GPS week: 1445 Day: 4 MJD: 54363
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]
--------+----------------------------------------------------+------------------------------
bkg 55| 12 -10 11 106 66 -205 -.25 73 55 | 0 -380 4162 4405
cod 173| 0 0 1 -57 19 173 -.16 23 25 | --- --- --- ---
esx 42| -9 -8 -19 -164 30 288 -.26 240 83 | 3067409 77158 15818 18735
iac n/a| 6 3 -3 198 13 -245 .44 56 56 | 1229022 19458 14540 19143
Table 2.1445.5 GPS week: 1445 Day: 5 MJD: 54364
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]
--------+----------------------------------------------------+------------------------------
bkg 55| 1 8 23 76 26 -174 -.05 66 64 | 0 -96 3576 3784
cod 173| -1 -5 -6 -34 -78 269 -.06 49 37 | --- --- --- ---
esx 42| -3 -11 -27 204 34 327 -.48 284 128 | 691448 17660 12732 22272
iac n/a| 3 -2 6 3 125 -478 .22 65 65 | 1254318 12746 11800 22621
Table 2.1445.6 GPS week: 1445 Day: 6 MJD: 54365
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]
--------+----------------------------------------------------+------------------------------
bkg 55| 3 7 -3 25 16 -44 .28 57 53 | 0 1417 3253 3532
cod 173| -3 -7 5 -79 -137 203 .03 46 35 | --- --- --- ---
esx 42| -4 0 8 -39 287 -35 -.18 205 76 | -22388 -4312 10692 17787
iac n/a| 3 5 2 53 -59 -179 .11 52 52 | 1225835 1295 9870 18606
Table 3: Daily fit for each satellite and each centre resulting from weighted
average combination and from long arc orbit dynamics (7-day). The
first IGL column gives resulting satellite accuracy measures found in
SP3 header. The last IGL column gives the RMS fit of the IGL orbit
when processed through the 7-day arc evaluation.
"E" stands for eclipsing satellites (earth).
"M" stands for eclipsing satellites (moon).
"X" stands for excluded from the statistics but included in IGL orbit.
"T" stands for Total long arc orbit RMS for all satellites.
"NE" stands for long arc orbit RMS for Non-Eclipsing satellites only.
"MEDI" stands for median of the centre's satellite RMS.
"MD"
Units: mm.
Table 3.1445.0 GPS week: 1445 Day: 0 MJD: 54359
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 6357 43 20 131 40 30 | 16 34 77 61 28
R04 | 6703 27 27 3613 32 20 | 19 28 712 41 23
R06 | 1735 29 22 70 28 19 | 43 40 67 44 38
R07 | 2221 30 26 151 43 32 | 45 32 170 46 47
R08 | 4340 25 52 629 44 29 | 33 45 344 53 28
R10 | 2675 25 28 430 30 19 | 36 38 263 49 33
R14 | 2993 60 40 465 49 36 | 33 21 201 56 29
XR23E | ---- --- 1579 >>>> 1812 1692 | --- 384 8 9999 9999
R24E |11420 134 226 401 232 130 | 129 9999 9999 142 9999
------+-------------------------------+---------------------------
RMS | 5686 58 85 1325 90 |T 44 136 230 61 32
WRMS | 5686 39 34 171 90 |NE 32 34 262 50 32
MEDI | 2993 29 28 430 43 |MD 33 38 170 49 29
Table 3.1445.1 GPS week: 1445 Day: 1 MJD: 54360
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 3225 30 41 53 23 19 | 16 35 120 52 35
XR04 | 3446 40 61 --- 52 37 | 24 43 --- 58 28
R06 | 2039 22 43 59 28 21 | 38 44 49 33 31
R07 | 2304 30 24 61 24 18 | 41 28 63 28 26
R08 | 2528 44 64 50 46 37 | 31 63 195 52 31
R10 | 1933 31 31 410 37 24 | 24 38 185 54 31
R14 | 1243 43 31 406 27 23 | 35 38 230 20 23
XR23E | ---- --- 595 --- 454 520 | --- 205 --- 679 393
R24E |15105 190 172 399 118 112 | 175 9999 9999 116 9999
------+-------------------------------+---------------------------
RMS | 6091 78 75 268 54 |T 48 101 140 121 74
WRMS | 6091 39 37 81 54 |NE 29 41 140 42 29
MEDI | 2304 31 43 61 37 |MD 31 43 120 52 31
Table 3.1445.2 GPS week: 1445 Day: 2 MJD: 54361
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 4391 64 33 54 29 25 | 29 59 122 67 54
XR04 | 3683 37 54 --- 32 29 | 34 37 --- 42 34
R06 | 1735 49 49 70 35 27 | 52 61 64 27 37
R07 | 2380 27 20 47 13 14 | 25 43 44 25 23
R08 | 2558 56 60 98 35 34 | 35 55 191 72 41
R10 | 2101 26 25 379 15 15 | 38 30 161 22 21
R14 | 2421 26 33 393 21 18 | 22 31 270 44 31
XR21E | ---- --- 18 >>>> --- 0 | --- 512 9999 --- 375
XR23E | ---- --- 117 --- 177 155 | --- 477 --- 748 368
R24E |21564 275 229 >>>> 113 142 | 247 9999 9999 96 9999
------+-------------------------------+---------------------------
RMS | 8534 112 94 >>>> 49 |T 60 145 142 127 109
WRMS | 8534 46 35 77 49 |NE 33 45 142 42 34
MEDI | 2421 37 33 98 32 |MD 34 55 122 44 37
Table 3.1445.3 GPS week: 1445 Day: 3 MJD: 54362
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 5375 36 15 166 26 31 | 24 26 118 43 22
XR04 | 3480 38 33 --- 43 27 | 18 36 --- 60 27
R06 | 1605 58 38 81 26 26 | 55 55 47 26 19
R07 | 3563 26 47 88 47 27 | 15 40 113 69 38
R08 | 6022 43 36 323 47 30 | 32 34 281 59 33
R10 | 3199 19 22 442 22 15 | 19 22 156 34 24
R14 | 2792 43 43 409 45 31 | 28 43 220 68 37
XR23E |10817 --- 4 --- --- 0 | --- 239 --- --- 250
------+-------------------------------+---------------------------
RMS | 4051 40 36 291 37 |T 27 107 155 51 56
WRMS | 4051 36 38 164 37 |NE 27 36 155 51 28
MEDI | 3480 38 33 166 43 |MD 24 40 118 59 27
Table 3.1445.4 GPS week: 1445 Day: 4 MJD: 54363
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 9650 49 10 116 47 28 | 22 34 91 55 30
XR04 |12497 47 16 --- 18 16 | 39 39 --- 33 29
R06 | 8810 145 24 108 38 39 | 45 43 100 32 35
R07 | 9387 50 23 33 30 17 | 24 45 30 40 28
R08 | 8907 46 28 55 80 29 | 37 39 113 40 36
R10 | 9981 51 19 429 40 22 | 19 42 164 21 29
R14 |11738 33 31 362 79 34 | 25 26 119 105 37
XR21E |11707 331 79 --- --- 160 | 43 279 --- --- 192
XR23E |11605 195 50 --- 121 73 | 50 155 --- 278 108
------+-------------------------------+---------------------------
RMS | 9795 73 23 240 56 |T 33 78 102 75 58
WRMS | 9795 55 25 83 56 |NE 30 38 102 46 32
MEDI | 9981 50 24 108 40 |MD 37 42 100 40 35
Table 3.1445.5 GPS week: 1445 Day: 5 MJD: 54364
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 2265 63 37 125 35 33 | 16 39 56 29 19
R04 | 2240 41 29 92 42 26 | 35 41 404 39 25
R06 | 1992 113 37 66 80 43 | 49 29 70 55 33
R07 | 2834 24 31 57 25 18 | 32 48 59 36 32
R08 | 3072 58 58 257 87 59 | 32 58 183 30 21
R10 | 4833 35 24 424 52 26 | 45 49 177 25 38
R14 | 1989 34 43 407 55 32 | 46 28 94 67 31
R21E | 4411 102 96 452 104 71 | 35 210 9999 47 89
XR23E | 8466 83 57 --- 86 52 | 44 108 --- 241 158
XR24E | ---- --- 16 --- --- 0 | --- 9999 --- --- 9999
------+-------------------------------+---------------------------
RMS | 3130 66 49 284 65 |T 37 67 149 63 49
WRMS | 3130 64 37 128 65 |NE 36 41 149 40 28
MEDI | 2834 58 37 125 55 |MD 35 48 94 39 32
Table 3.1445.6 GPS week: 1445 Day: 6 MJD: 54365
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 3929 42 40 33 75 30 | 19 43 54 36 24
R04 | 2353 67 31 76 35 29 | 70 21 357 29 22
R06 | 1615 52 41 137 40 38 | 55 33 90 28 33
R07 | 2841 36 22 68 51 25 | 23 41 56 46 30
R08 | 3695 82 36 85 30 32 | 36 64 139 33 45
R10 | 4105 16 20 386 29 16 | 48 42 234 60 47
R14 | 1733 25 32 374 35 22 | 25 21 95 48 26
R21E | 2936 92 98 105 87 55 | 58 252 9999 51 142
XR23E | 6896 53 55 --- 75 44 | 41 143 --- 262 146
XR24E | ---- --- 16 516 --- 0 | --- 9999 9999 --- 9999
------+-------------------------------+---------------------------
RMS | 3037 57 46 205 52 |T 41 73 146 65 57
WRMS | 3037 53 35 76 52 |NE 39 37 146 40 32
MEDI | 2936 52 32 105 40 |MD 41 42 95 46 33
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