[IGSREPORT-15008] Wk 1420 IGLOS Final Orbits
Gerd Gendt3
igsacc at gfz-potsdam.de
Thu Apr 19 06:59:54 PDT 2007
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IGS Electronic Report 19 Apr 06:59:59 PDT 2007 Message Number 15008
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Author: AC Coordinator / GFZ Potsdam
sum-file Version 2.0
IGLOS Orbit Combination - Week 1420 (Mar 25, 2007 - Mar 31, 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 2.1420.
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:
igl1420[0-6].sp3 IGLOS-PP Glonass ephemerides files for days 0-6
of GPS Week 1420 in the SP3 format.
igl14207.sum Combination Report for GPS Week 1420.
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 | 822.8 ns
1 | 842.7 ns
2 | 833.7 ns
3 | 837.4 ns
4 | 849.2 ns
5 | 826.9 ns
6 | 840.3 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
1 | IAC | R07
2 | ESX | R07 R18 R21 R22 R24
2 | IAC | R07
3 | ESX | R07
6 | COD | R01
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 1.1420, 1a.1420).
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 2.1420.0-6)
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 3.1420.0-6).
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 1420 summary. (Mar 25, 2007 - Mar 31, 2007)
Table 1.1420.a GPS week : 1420 MJD: 54184.0-54190.0
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 56| 0 -4 -1 164 -56 -75 -.15 84 40 | 0 2327 5969 6516
| 3 3 7 42 66 151 .14 | 0 3389
cod 165| 0 0 4 124 -18 60 -.18 48 33 | --- --- --- ---
| 5 4 4 46 78 76 .08 | --- ---
esx 44| 1 7 2 182 75 87 -.34 204 143 | -335496 -6419 14263 28388
| 6 10 5 103 198 358 .29 | 465407 17503
iac n/a| 0 0 -4 -267 41 -19 .36 69 69 | 831197 -1273 13122 26473
| 3 4 6 60 44 48 .10 | 11256 14687
Table 1.1420.b GPS week : 1420 MJD: 54184.0-54190.0
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 | 17 27 78 22 21 29 34 |
R02 | 15 15 79 13 14 15 21 |
R03 | 29 41 45 44 49 57 58 |
R04 | 26 26 73 12 18 17 19 |
R06 | 33 39 62 29 15 27 28 |
R07 | 31 39 --- --- --- --- --- |
R08 | 20 23 82 22 17 16 16 |
R10 | 24 21 37 24 22 29 27 |
R14 | 23 29 42 11 32 36 26 |
R19E | 27 27 82 26 27 38 20 |
R23E | 0 0 0 0 0 0 0 |
R24E | 84 82 81 90 73 75 110 |
Table 1.1420.c GPS week : 1420 MJD: 54184.0-54190.0
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 1420 0 | 304 -986 -82 372 11980 -348100 70.4 8913 8913 | 822835 0
brd 1420 1 | 244 138 -606 379 1195 -354200 90.9 8313 8313 | 842711 0
brd 1420 2 | -614 525 183 1395 1889 -386600 98.1 8229 8229 | 833699 0
brd 1420 3 | -149 180 -337 361 5806 -401400 93.5 9649 9649 | 837449 0
brd 1420 4 | 10 -450 -1649 13280 9249 -415500 76.7 10640 10640 | 849184 0
brd 1420 5 | -436 344 -223 -1083 3597 -398500 88.2 8964 8964 | 826862 0
brd 1420 6 | -129 -302 5 3479 -1590 -376700 82.0 6369 6369 | 840271 0
-------------+------------------------------------------------------------+----------------
brd 1420 mean| -110 -78 -386 2597 4589 -383000 85.7 8725 8725 | 836144 0
brd 1420 sdev| 335 527 611 4911 4757 24950 9.8 1327 1327 | 9139 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 2.1420.0 GPS week: 1420 Day: 0 MJD: 54184
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 56| -3 -2 0 154 -6 -131 -.02 75 41 | 0 -34 5271 5684
cod 165| 3 1 -3 53 -92 131 -.21 48 31 | --- --- --- ---
esx 44| -1 -1 3 204 99 -196 -.02 121 57 | 16911 -23783 14017 25129
iac n/a| -2 -2 4 -188 63 -19 .19 39 39 | 827748 -16989 12774 24154
Table 2.1420.1 GPS week: 1420 Day: 1 MJD: 54185
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 56| -5 -5 1 215 -54 -173 -.10 67 36 | 0 1146 4462 5011
cod 165| 2 -2 4 126 -80 150 -.27 71 58 | --- --- --- ---
esx 44| 7 4 2 32 183 126 -.52 108 50 | -999999 6917 13955 23281
iac n/a| 0 0 -4 -224 93 -19 .43 187 187 | 831246 11070 13361 21827
Table 2.1420.2 GPS week: 1420 Day: 2 MJD: 54186
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 56| 1 -2 8 192 -79 -252 -.03 93 61 | 0 189 3552 3744
cod 165| -6 -2 7 149 -34 -13 -.14 48 34 | --- --- --- ---
esx 44| 8 29 8 172 388 826 -.79 699 699 | -999999 5361 10876 12678
iac n/a| -2 2 -14 -326 36 38 .30 47 47 | 834180 5518 9867 13067
Table 2.1420.3 GPS week: 1420 Day: 3 MJD: 54187
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 56| 1 -12 -14 110 38 181 -.06 107 39 | 0 1520 3946 4475
cod 165| -6 -2 5 206 -45 -24 -.03 50 20 | --- --- --- ---
esx 44| 1 0 8 95 114 -48 -.53 134 56 | -7236 14312 9186 17445
iac n/a| 0 -3 1 -264 21 -61 .30 35 35 | 835644 3174 8960 16613
Table 2.1420.4 GPS week: 1420 Day: 4 MJD: 54188
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 56| 2 -5 1 214 -112 13 -.35 45 25 | 0 179 4554 5066
cod 165| 3 -6 9 121 76 100 -.24 41 22 | --- --- --- ---
esx 44| 8 11 -8 154 -61 -140 -.14 119 45 | 9079 -28827 20659 34991
iac n/a| -3 5 -2 -214 87 20 .47 56 56 | 851143 -22061 18634 32339
Table 2.1420.5 GPS week: 1420 Day: 5 MJD: 54189
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 56| 1 0 0 136 -25 16 -.14 64 32 | 0 9369 11756 12739
cod 165| 5 8 2 117 106 -18 -.18 39 31 | --- --- --- ---
esx 44| -6 1 -1 310 -250 200 -.27 118 54 | -84404 -21072 16618 54057
iac n/a| 0 -10 -4 -305 -36 -100 .37 51 51 | 815062 -7335 15258 49157
Table 2.1420.6 GPS week: 1420 Day: 6 MJD: 54190
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 56| -3 0 -4 130 -157 -183 -.35 138 50 | 0 3923 8248 8897
cod 165| -6 0 9 97 -57 96 -.19 38 31 | --- --- --- ---
esx 44| -4 6 3 308 51 -154 -.09 127 43 | -282830 2155 14534 31135
iac n/a| 5 0 -9 -346 24 3 .48 65 65 | 823357 17706 13000 28156
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 3.1420.0 GPS week: 1420 Day: 0 MJD: 54184
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 5731 26 29 45 22 16 | 58 611 135 48 50
R02 | 3325 19 19 49 22 14 | 48 37 130 55 40
XR03 | ---- 27 43 --- 43 28 | 51 65 --- 57 51
R04 | 4680 29 36 102 21 26 | 39 51 141 32 31
R06 | 8370 44 71 42 53 33 | 55 90 53 41 49
R07 |18638 95 39 34 32 30 | 53 48 9999 143 30
R08 | 6257 26 19 69 29 19 | 41 31 155 23 29
XR10 | 3839 51 22 --- 28 23 | 28 31 --- 25 20
XR14 | 4096 40 35 --- 21 22 | 37 57 --- 44 37
R19E | 5712 57 30 65 42 26 | 53 48 198 70 53
XR23E | 8062 --- 10 --- --- 0 | --- 246 --- --- 246
R24E | 8969 170 90 301 68 84 | 298 206 143 267 233
------+-------------------------------+---------------------------
RMS | 8912 75 48 121 39 |T 69 126 136 73 72
WRMS | 8912 41 31 57 39 |NE 45 113 122 52 37
MEDI | 5731 40 30 49 29 |MD 51 51 141 48 40
Table 3.1420.1 GPS week: 1420 Day: 1 MJD: 54185
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 7438 39 57 75 23 26 | 57 668 250 53 44
R02 | 3534 29 20 38 19 15 | 45 38 232 19 29
XR03 | ---- 76 67 --- 37 41 | 93 52 --- 67 52
R04 | 2057 14 65 74 28 26 | 38 33 239 47 31
R06 | 3346 43 111 39 57 38 | 70 84 45 58 58
R07 |17908 40 58 70 520 39 | 65 38 9999 162 32
R08 | 6447 45 38 43 36 23 | 44 32 202 40 23
XR10 | 2864 33 38 --- 20 20 | 80 38 --- 36 42
XR14 | 2818 60 30 --- 29 28 | 42 38 --- 30 30
R19E | 8228 53 49 50 36 26 | 64 69 244 66 59
XR23E | 8307 --- 13 --- --- 0 | --- 169 --- --- 164
R24E | 6292 157 116 264 46 81 | 163 119 317 197 131
------+-------------------------------+---------------------------
RMS | 8313 67 71 108 187 |T 69 114 218 70 57
WRMS | 8313 36 58 50 187 |NE 59 113 193 56 37
MEDI | 6292 43 49 50 36 |MD 64 38 239 53 42
Table 3.1420.2 GPS week: 1420 Day: 2 MJD: 54186
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 |12135 76 39 659 33 77 | 83 447 427 55 63
R02 | 6334 73 32 682 29 79 | 68 55 432 35 30
XR03 | ---- 82 69 --- 35 44 | 85 49 --- 56 37
R04 | 3566 43 22 642 39 73 | 30 37 447 37 31
XR06 |11430 49 114 --- 80 62 | 40 137 --- 51 60
R08 | 3884 47 52 703 42 81 | 66 37 450 30 41
XR10 | 5588 55 35 --- 63 37 | 54 43 --- 60 33
XR14 | 4612 95 27 --- 49 42 | 56 30 --- 34 25
R19E |12096 85 27 695 41 81 | 54 65 368 67 61
XR23E | 8310 --- 11 --- --- 0 | --- 267 --- --- 266
R24E | 6688 173 87 800 80 81 | 185 153 407 183 145
------+-------------------------------+---------------------------
RMS | 8228 93 48 699 47 |T 72 120 421 71 72
WRMS | 8228 61 34 699 47 |NE 60 104 439 59 40
MEDI | 6334 73 35 682 41 |MD 56 55 427 55 41
Table 3.1420.3 GPS week: 1420 Day: 3 MJD: 54187
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 |13916 28 25 89 26 22 | 64 593 151 74 56
R02 | 9355 33 12 45 14 13 | 52 45 175 42 37
XR03 | ---- 87 64 --- 47 44 | 38 65 --- 63 36
R04 | 6510 16 18 31 18 11 | 27 39 186 35 28
XR06 |12965 40 45 --- 35 28 | 52 44 --- 61 35
R08 | 2118 41 26 72 29 21 | 63 58 223 55 53
XR10 | 8189 49 29 --- 28 23 | 45 52 --- 31 26
XR14 | 4501 23 16 --- 11 11 | 57 42 --- 27 32
R19E |12253 71 34 44 37 25 | 51 47 156 55 44
XR23E | 4989 --- 14 --- --- 0 | --- 163 --- --- 168
R24E | 8968 246 110 300 64 90 | 192 139 230 124 102
------+-------------------------------+---------------------------
RMS | 9649 107 50 134 35 |T 64 117 186 56 56
WRMS | 9649 39 20 56 35 |NE 49 117 183 48 37
MEDI | 8189 40 26 45 28 |MD 52 52 175 55 37
Table 3.1420.4 GPS week: 1420 Day: 4 MJD: 54188
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 |12421 21 40 78 21 21 | 48 839 111 47 40
R02 | 8659 28 11 41 19 13 | 44 34 80 30 24
XR03 | ---- 93 63 --- 50 49 | 46 77 --- 60 40
R04 | 9680 25 38 34 26 17 | 23 56 101 30 24
XR06 |12227 22 21 --- 18 14 | 36 51 --- 31 28
R08 | 2368 22 30 40 31 17 | 41 51 87 61 47
XR10 |11418 41 30 --- 22 22 | 42 46 --- 29 25
XR14 | 5473 43 49 --- 41 31 | 28 45 --- 49 31
R19E |15609 50 41 47 48 27 | 72 74 93 68 58
XR23E | 4676 --- 13 --- --- 0 | --- 186 --- --- 185
R24E |10323 86 64 269 120 73 | 188 163 170 133 164
------+-------------------------------+---------------------------
RMS |10636 45 41 119 56 |T 56 147 107 53 60
WRMS |10636 25 22 45 56 |NE 38 149 94 42 32
MEDI | 9680 28 38 41 26 |MD 42 56 93 47 40
Table 3.1420.5 GPS week: 1420 Day: 5 MJD: 54189
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
R01 | 7985 31 42 83 48 28 | 45 9999 75 64 48
R02 | 4497 25 25 24 29 15 | 53 47 59 45 38
XR03 | ---- 109 86 --- 42 57 | 48 99 --- 36 50
R04 | 8536 27 27 41 23 16 | 29 43 75 31 26
R06 |11586 46 46 63 40 27 | 52 72 62 62 40
R08 | 3852 17 32 37 21 15 | 39 43 65 31 33
XR10 |14704 47 41 --- 36 29 | 30 42 --- 24 20
XR14 | 6692 61 46 --- 45 35 | 33 70 --- 59 46
R19E |13308 110 38 77 42 38 | 69 95 117 68 70
XR23E | 5122 --- 11 --- --- 0 | --- 237 --- --- 232
R24E | 8911 110 56 279 104 74 | 177 198 136 183 173
------+-------------------------------+---------------------------
RMS | 8963 64 39 118 51 |T 57 94 84 60 70
WRMS | 8963 32 31 54 51 |NE 41 59 67 44 37
MEDI | 7985 46 41 63 40 |MD 45 70 75 45 46
Table 3.1420.6 GPS week: 1420 Day: 6 MJD: 54190
Weighted Average Orbit Dynamics (7 days)
PRN | brd bkg cod esx iac IGL | bkg cod esx iac IGL
------+-------------------------------+---------------------------
XR01 |19619 48 6247 --- 25 34 | 63 9999 --- 52 57
R02 | 2907 18 39 46 30 20 | 41 43 40 28 30
XR03 |37891 176 48 --- 33 58 | 59 75 --- 80 59
R04 | 4656 64 21 41 16 19 | 37 39 77 27 28
R06 | 9147 55 50 26 49 27 | 49 92 88 72 65
R08 | 6450 30 18 36 29 15 | 42 45 86 43 40
XR10 | 7299 42 33 --- 43 27 | 47 42 --- 34 35
XR14 | 6710 61 16 --- 40 25 | 32 46 --- 40 29
R19E | 6693 50 24 51 23 19 | 99 123 151 132 117
XR23E | 6627 --- 10 --- --- 0 | --- 273 --- --- 274
R24E | 6568 323 56 297 144 110 | 134 137 164 152 136
------+-------------------------------+---------------------------
RMS | 6368 138 38 127 65 |T 60 91 101 66 79
WRMS | 6368 50 31 43 65 |NE 46 54 72 47 42
MEDI | 6693 50 33 41 30 |MD 47 46 86 43 57
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