[IGSMAIL-118] JPL analysis report
J.
J.
Thu Oct 15 17:23:49 PDT 1992
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IGS Electronic Mail 15-OCT-1992 17:23:49 Message Number 118
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THIS FILE CONTAINS 4 MESSAGES
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^From: J. Zumberge
Subject: JPL analysis report
-------------------
Submitted by
J F Zumberge, G Blewitt, M B Heflin, D C Jefferson, F H Webb
all at the Jet Propulsion Laboratory, California Institute of Technology,
Pasadena, CA 91109.
The following files have been posted on BODHI (for access to BODHI contact
starr at logos.jpl.nasa.gov):
______________________________________________________________________________
filename contents
______________________________________________________________________________
jpl06647.sum This text file.
jpl06647.erp Earth rotation parameters for GPS week 664.
jpl06647.sp1 GPS ephemerides for GPS week 664, sp1 format.
jpl06647.sp3 " " " " " " , sp3 " .
______________________________________________________________________________
A-S testing occurred during "26 Sep 92 0100 UT to 28 Sep 92 1000 UT" and
"03 Oct 92 0100 UT to 05 Oct 92 1000 UT", according to the file
pub/gps/gpstd.txt obtained from tycho.usno.navy.mil. Results for Sunday,
Sep 27, and Saturday, Oct 03, are not included in this submission. The
results for Monday, Sep 28, exclude data from Block-II satellites
acquired when A-S was on.
We begin this week using 30 hours of data for every day analyzed, so that
the solar radiation pressure coefficients, estimated as stochastic
parameters, are better determined at the beginning and end of the day.
Thus, on Wednesday, Sep 30, for example, data beginning Tuesday, Sep 29
at 21:00 GPS time through Thursday, Oct 1 at 03:00 GPS time are used.
(The daily analyses are therefore not completely independent, as there
are 3 hours of common data on adjacent days.)
A consequence of this is better agreement in satellite positions at
the midnight boundary between adjacent days, as can be seen by the
generally smaller numbers in the ORBIT REPEATABILITY TABLE. Some of
this is due to the fact that common data are used. However, we also
believe that the orbits are actually improved because of better
estimations of the solar radiation pressure coefficients near the
beginning and end of each day.
We continue to de-weight data from GPS27, although, as of Tue, Sep 29,
it fits the model reasonably well.
WARNING: GPS27 is not well modeled on Monday, Sep 28. We recommend using
the broadcast ephemeris for that satellite and day.
JPL LODR TABLE GPS week 664 (1992 Sep 28 - Oct 02)
MJD LODR +/-
(ms/day)
48893.5 2.23 0.09
48894.5 2.24 0.06
48895.5 2.34 0.06
48896.5 2.40 0.06
48897.5 2.15 0.06
END LODR TABLE
NOTE: In the following table, UT1R-UTC are the assumed nominal values from
IERS Bulletin-B predicts; estimated LODR values are given in the previous
table. See IGS Mail Message 97 for details.
JPL UTPM TABLE GPS week 664 (1992 Sep 28 - Oct 02)
MJD X Y UT1R-UTC XSIG YSIG UTSIG RMS XYC XUC YUC STA SAT PASS
'' '' sec '' '' sec
48893.5 .05135 .50494 .29227 .00040 .00045 .00000 .0 -.08 .00 .00 26 19 0
48894.5 .05356 .50519 .29002 .00018 .00018 .00000 .0 .02 .00 .00 26 19 0
48895.5 .05590 .50461 .28806 .00018 .00018 .00000 .0 -.01 .00 .00 26 19 0
48896.5 .05817 .50400 .28594 .00017 .00018 .00000 .0 .01 .00 .00 26 19 0
48897.5 .06082 .50381 .28381 .00019 .00019 .00000 .0 .02 .00 .00 26 19 0
END UTPM TABLE
The following table indicates the "3-dimensional orbit repeatability", as
defined in IGS Mail Message 37, for GPS week 664:
JPL ORBIT REPEATABILITY TABLE GPS week 664 (1992 Sep 28 - Oct 02)
92 9 28 92 9 29 92 9 30 92 10 1 92 10 2
prn rms (m)
2 0.8 0.66 0.30 0.17 0.2
3 1.3 1.23 0.76 0.73 0.9
11 0.5 0.45 0.38 0.47 0.6
12 1.1 1.00 0.42 0.54 0.5
13 0.4 0.58 0.34 0.39 0.3
14 0.6 0.51 0.32 0.37 0.4
15 0.5 0.25 0.23 0.18 0.2
16 0.6 0.40 0.50 0.43 0.4
17 0.8 1.38 1.06 0.21 0.2
18 0.6 0.39 0.14 0.64 0.5
19 0.4 0.56 0.27 0.31 0.3
20 0.6 0.40 0.22 0.41 0.5
21 0.5 0.53 0.30 0.38 0.6
23 0.2 0.33 0.39 0.21 0.1
24 0.7 0.75 0.69 0.57 0.3
25 0.5 0.45 0.19 0.16 0.1
26 0.5 0.27 0.43 0.34 0.5
27 352.1 339.55 1.48 2.90 2.6
28 0.5 0.37 0.47 0.39 0.4
END ORBIT REPEATABILITY TABLE
As described in IGS Mail Message 37, the following table compares the JPL
precise ephemerides with those from the broadcast ephemeris:
JPL COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES
92 9 28 92 9 29 92 9 30 92 10 1 92 10 2
prn rms (m)
2 13.1 12.1 11.4 12.3 12.7
3 11.1 13.6 15.8 12.6 13.8
11 2.5 5.1 2.7 6.7 12.0
12 5.3 11.5 7.2 6.7 13.0
13 10.0 8.7 11.1 6.3 8.5
14 5.0 5.2 5.7 4.5 4.8
15 6.5 3.7 8.7 8.1 5.8
16 12.1 10.6 11.0 9.9 8.6
17 9.8 6.5 5.7 7.1 8.0
18 8.5 7.1 7.5 8.4 7.5
19 4.9 4.3 4.8 5.5 6.4
20 5.4 9.6 7.3 6.1 4.8
21 8.3 5.8 5.8 6.6 14.5
23 4.6 5.9 7.6 5.7 6.1
24 12.3 8.7 10.5 15.3 15.1
25 10.2 9.7 9.6 7.4 8.0
26 8.2 9.2 7.5 8.6 7.2
27 452.5 13.2 16.2 22.6 21.5
28 5.7 4.0 3.6 3.7 3.4
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES
The following table, as explained in IGS Mail Message 91, indicates which
tracking sites were used in this week's analysis:
JPL GROUND STATION INCLUSION TABLE GPS week 664 (1992 Sep 28 - Oct 02)
92 9 28 92 9 29 92 9 30 92 10 1 92 10 2
ALBH X X X X X
ALGO* X X X X X
FAIR* X X X X X
GOLD X X X X X
HART* X X X X X
HERS X X X X X
JPLM X X X X X
KOSG X X X X X
MADR* X X X X X
MASP X X X X X
MATE X X X X X
MCMU X X X X X
METS X X X X X
NYAL X X X X X
ONSA X X X X X
PAMA X X X X X
PENT X X X X X
SANT* X X X X X
STJO X X X X X
TAIW X X X X X
TIDB X X X X X
TROM* X X X X X
USUD X X X X X
WETT X X X X X
YAR1* X X X X X
YELL X X X X X
_______________________
*Indicates fiducial site.
END GROUND STATION INCLUSION TABLE
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^From: IERS\CB
Subject: EARTH ORIENTATION Bulletin number 8 - 14 October 1992 -
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* *
IGS'92 EARTH ORIENTATION BULLETIN 8
* *
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14 OCTOBER 1992
1 - EARTH ORIENTATION PARAMETERS (IERS/CB evaluation) : EOP(IERS) 90 C 04
Date MJD x y UT1-UTC
1992 0.0001" 0.00001s
(0h UTC)
AUG 31 48865 -157.0 4999.0 34553.3
SEP 1 48866 -132.0 5009.0 34326.7
SEP 2 48867 -110.0 5012.0 34130.2
SEP 3 48868 -89.0 5011.0 33961.4
SEP 4 48869 -67.0 5009.0 33815.7
SEP 5 48870 -44.0 5008.0 33681.2
SEP 6 48871 -20.0 5012.0 33547.0
SEP 7 48872 6.0 5020.0 33402.7
SEP 8 48873 31.0 5030.0 33244.5
SEP 9 48874 56.0 5039.0 33068.6
SEP 10 48875 79.0 5046.0 32877.0
SEP 11 48876 102.0 5051.0 32672.7
SEP 12 48877 125.0 5053.0 32459.6
SEP 13 48878 148.0 5055.0 32245.9
SEP 14 48879 170.0 5056.0 32035.9
SEP 15 48880 193.0 5058.0 31833.7
SEP 16 48881 217.0 5061.0 31644.1
SEP 17 48882 241.0 5064.0 31467.1
SEP 18 48883 266.0 5064.0 31302.3
SEP 19 48884 291.0 5064.0 31143.0
SEP 20 48885 316.0 5063.0 30983.0
SEP 21 48886 340.0 5063.0 30811.6
SEP 22 48887 361.0 5062.0 30624.4
SEP 23 48888 382.0 5062.0 30413.9
SEP 24 48889 401.0 5061.0 30178.0
SEP 25 48890 420.0 5060.0 29923.7
SEP 26 48891 440.0 5058.0 29659.7
SEP 27 48892 460.0 5055.0 29401.2
SEP 28 48893 481.0 5051.0 29159.7
SEP 29 48894 503.0 5047.0 28943.6
2 - INDIVIDUAL SERIES OF EARTH ORIENTATION PARAMETERS
The series listed hereafter,obtained by the IGS Processing Centres,
are described in the IGS'92 Earth Orientation Bulletin number 2 and in
the IGSMail Messages .
Note : AS (antispoofing) was activated on several satellites on
August 1, 2, 3, 8, 9,10, 15,16,17, 23,24,25
Sept. 12,13,14, 19,20,21, 26,27 and 28.
2 -a - EOP(CODE) 92 P 04
Units : 0.0001" for x,y, 0.00001s for UT1 and D.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
SEP 11 48876.50 112.0 5070.5 32939.7 72.0 1.0 0.9 0.7
SEP 12 48877.50 126.4 5068.5 32729.3 96.0 1.9 1.7 1.1
SEP 13 48878.50 161.9 5062.0 32530.3 96.0 2.2 2.1 1.4
SEP 14 48879.50 194.8 5062.9 32339.8 72.0 2.0 2.4 2.8
SEP 15 48880.50 200.2 5080.3 32154.9 72.0 1.3 1.1 1.4
SEP 16 48881.50 224.6 5083.5 31975.3 72.0 1.4 1.2 0.9
SEP 17 48882.50 260.4 5090.2 31802.4 72.0 1.2 1.0 0.8
SEP 18 48883.50 280.0 5092.6 31637.0 72.0 1.2 0.9 0.6
SEP 19 48884.50 327.4 5099.2 31475.2 96.0 3.0 2.6 1.7
SEP 20 48885.50 336.6 5076.3 31308.7 72.0 3.4 3.2 2.0
SEP 21 48886.50 357.7 5065.5 31133.1 72.0 1.7 2.1 2.0
SEP 22 48887.50 364.4 5065.7 30940.6 72.0 1.2 1.2 0.9
SEP 23 48888.50 383.6 5072.2 30721.9 72.0 1.0 1.0 0.7
SEP 24 48889.50 404.8 5073.5 30479.8 72.0 1.0 1.0 0.6
SEP 25 48890.50 435.9 5088.7 30223.7 72.0 1.3 1.3 0.7
SEP 26 48891.50 461.2 5081.7 29954.6 72.0 1.7 1.9 0.9
SEP 27 48892.50 479.9 5078.6 29690.4 72.0 2.8 2.7 1.6
SEP 28 48893.50 526.4 5069.6 29452.8 72.0 1.9 1.8 1.4
2 -b - EOP(CSR) 92 P 01
Units : 0.0001" for x,y, 0.00001s for UT1 and D.
A recent description of this analysis can be found in IGSMail 110.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
AUG 30 48864.50 -164.7 5008.9 462 1.7 2.6
AUG 31 48865.50 -133.7 5014.3 449 1.6 2.0
SEP 1 48866.50 -121.2 5029.1 424 2.4 2.7
SEP 2 48867.50 -89.2 5029.7 404 2.0 2.5
SEP 3 48868.50 -72.3 5020.1 487 1.5 2.6
SEP 4 48869.50 -51.2 5021.5 505 1.5 1.9
SEP 5 48870.50 -33.2 5031.4 408 1.9 2.2
2 -c - EOP(EMR) 92 P 01
Units : 0.0001" for x,y, 0.00001s for UT1 and D.
A recent description of this analysis can be found in IGSMail 111.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
SEP 7 48872.50 12.9 5064.3 4.6 2.8
SEP 8 48873.50 29.7 5060.0 4.9 3.1
SEP 9 48874.50 50.7 5077.1 4.6 2.8
SEP 10 48875.50 73.0 5076.2 4.7 2.9
SEP 11 48876.50 107.7 5088.5 4.7 2.9
SEP 15 48880.50 201.0 5093.5 6.1 6.3
SEP 16 48881.50 222.0 5092.4 6.5 4.4
SEP 17 48882.50 251.1 5094.9 5.7 3.5
SEP 18 48883.50 277.5 5086.2 6.6 4.5
SEP 22 48887.50 349.1 5073.8 6.0 4.4
SEP 23 48888.50 379.1 5079.6 5.0 3.1
SEP 24 48889.50 396.9 5087.4 5.9 3.4
SEP 25 48890.50 415.9 5077.8 6.2 4.4
SEP 29 48894.50 533.7 5064.9 5.3 3.2
SEP 30 48895.50 555.6 5049.8 4.8 2.9
OCT 1 48896.50 579.3 5041.4 4.8 2.9
OCT 2 48897.50 599.6 5046.0 4.8 2.9
2 -d - EOP(ESOC) 92 P 01
Units : 0.0001" for x,y, 0.00001s for UT1 and D.
A recent description of this analysis can be found in IGSMail 114.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
SEP 13 48878.50 174.3 5075.6 30.0 13.7 14.4
SEP 14 48879.50 203.5 5089.1 30.0 5.0 5.4
SEP 15 48880.50 210.8 5079.1 30.0 3.8 3.4
SEP 16 48881.50 245.2 5104.0 30.0 6.0 6.3
SEP 17 48882.50 277.9 5084.7 30.0 3.6 3.5
SEP 18 48883.50 285.4 5102.6 30.0 3.6 2.9
SEP 19 48884.50 341.4 5097.8 30.0 7.8 8.8
SEP 20 48885.50 338.2 5088.6 30.0 5.2 5.4
SEP 21 48886.50 390.1 5100.6 30.0 4.1 4.6
SEP 22 48887.50 398.7 5088.9 30.0 3.2 3.2
SEP 23 48888.50 436.4 5072.9 30.0 2.6 2.5
SEP 24 48889.50 431.4 5100.8 30.0 2.2 2.2
SEP 25 48890.50 456.0 5093.0 30.0 2.4 2.5
SEP 26 48891.50 479.1 5102.2 30.0 4.8 4.5
SEP 27 48892.50 492.7 5076.3 30.0 6.1 5.9
SEP 28 48893.50 512.8 5083.1 30.0 3.4 3.7
SEP 29 48894.50 544.0 5059.0 30.0 2.7 2.8
SEP 30 48895.50 557.0 5053.6 30.0 2.5 2.8
OCT 1 48896.50 583.3 5052.1 30.0 2.4 2.6
OCT 2 48897.50 610.5 5056.4 30.0 2.2 2.2
2 -e - EOP(GFZ) 92 P 02
Units : 0.0001" for x,y, 0.00001s for UT1 and D.
A recent description of this analysis can be found in IGSMail 112.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
AUG 30 48864.50 -150.0 5022.0 3.0 3.0
AUG 31 48865.50 -126.0 5034.0 3.0 3.0
SEP 1 48866.50 -87.0 5050.0 3.0 3.0
SEP 2 48867.50 -82.0 5046.0 3.0 3.0
SEP 3 48868.50 -58.0 5038.0 3.0 3.0
SEP 4 48869.50 -30.0 5034.0 2.0 3.0
SEP 5 48870.50 -8.0 5038.0 4.0 4.0
SEP 6 48871.50 5.0 5046.0 4.0 4.0
SEP 7 48872.50 41.0 5054.0 3.0 3.0
SEP 8 48873.50 67.0 5078.0 4.0 4.0
SEP 9 48874.50 90.0 5067.0 3.0 3.0
SEP 10 48875.50 98.0 5072.0 4.0 4.0
SEP 11 48876.50 140.0 5080.0 3.0 3.0
SEP 15 48880.50 230.0 5117.0 6.0 7.0
SEP 16 48881.50 252.0 5111.0 8.0 8.0
SEP 17 48882.50 288.0 5101.0 4.0 4.0
SEP 18 48883.50 298.0 5117.0 4.0 5.0
2 -f - EOP(JPL) 92 P 02
Units : 0.0001" for x,y, 0.00001s for UT1 and D.
A recent description of this analysis can be found in IGSMail 112.
Date Uncertainties
1992 MJD x y D Passes Span x y D
hours
SEP 14 48879.50 188.6 5054.6 189.4 6.0 6.0 12.0
SEP 15 48880.50 216.9 5077.4 180.6 2.3 2.7 7.0
SEP 16 48881.50 235.2 5074.2 158.8 2.1 2.4 7.0
SEP 17 48882.50 263.4 5074.7 178.7 2.2 2.4 7.0
SEP 18 48883.50 281.9 5079.9 185.0 2.2 2.4 7.0
SEP 21 48886.50 367.2 5053.8 252.0 7.4 7.5 14.0
SEP 22 48887.50 374.1 5069.3 201.5 2.7 2.6 8.0
SEP 23 48888.50 396.3 5075.2 242.1 2.3 2.5 7.0
SEP 24 48889.50 422.2 5072.3 263.9 2.3 2.4 7.0
SEP 25 48890.50 438.4 5063.4 273.5 3.0 3.1 8.0
2 -g - EOP(SIO) 92 P 03
Units : 0.0001" for x,y, 0.00001s for UT1 and D.
A recent description of this analysis can be found in IGSMail 112.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
SEP 12 48877.50 119.1 5089.8 18 5.5 5.3
SEP 13 48878.50 169.2 5077.2 7 7.0 6.6
SEP 14 48879.50 170.4 5072.7 18 4.7 5.2
SEP 15 48880.50 209.3 5094.3 18 3.0 2.4
SEP 16 48881.50 241.8 5098.6 18 2.4 2.1
SEP 17 48882.50 275.1 5097.3 18 2.1 1.9
SEP 18 48883.50 291.3 5100.1 18 2.5 2.1
SEP 19 48884.50 314.0 5094.5 18 7.8 6.7
SEP 21 48886.50 353.3 5069.9 18 7.0 7.5
SEP 22 48887.50 375.0 5086.0 18 2.5 2.1
SEP 23 48888.50 392.3 5085.9 18 2.3 1.9
SEP 24 48889.50 415.4 5090.7 18 2.2 2.0
SEP 25 48890.50 434.7 5096.0 18 2.5 2.0
SEP 26 48891.50 480.7 5090.8 7 7.9 6.8
SEP 27 48892.50 500.8 5093.8 7 9.7 7.8
SEP 28 48893.50 502.8 5087.4 19 3.3 3.4
SEP 29 48894.50 532.9 5073.9 19 2.0 1.6
SEP 30 48895.50 562.5 5066.3 19 1.7 1.5
OCT 1 48896.50 583.1 5060.6 19 1.8 1.6
OCT 2 48897.50 604.4 5058.6 19 1.6 1.4
3 - COMPARISONS OF GPS, LLR, SLR AND VLBI EARTH ORIENTATION DETERMINATIONS
A paper version of this part, with plots, will be mailed to the IERS Analysis
Centres and to the IGS Processing Centres. Additional copies are available on
request.
3.1 - GPS: TERRESTRIAL FRAME ORIENTATION FIXING
Various strategies are tested by the GPS Processing Centres for maintaining
the terrestrial frame orientation. The choices concern the nominal orientation
(ITRF90 or ITRF91), the site motion model used to transfer the coordinates at
the reference epoch, the number of fiducial stations that are fixed, and the
source from which the fixed coordinates are taken. We summarize in Table 1 our
understanding of the terrestrial frame definitions according to the Centres
and to the time periods.
Table 1 - GPS SOLUTIONS: TERRESTRIAL FRAME ORIENTATION
---------------------------------------------------------------------------
Series MJD GPS Nominal
(IERS label) from to weeks refrnce Source
---------------------------------------------------------------------------
EOP(CODE) 92 P 04 48792-48893 650-663 ITRF91 IERS (IGSMail 33)
EOP(CSR) 92 P 01 48794-48870 650-660 CSR+GSFC (IGSMail 62)
EOP(EMR) 92 P 01 48838-48897 655-664 ITRF91 IERS (IGSMAIL 90)
EOP(ESOC) 92 P 01 48794-48897 650-664 ITRF91 IERS (IGSMail 90)
EOP(GFZ) 92 P 01 48794-48821 650-653 ITRF90 SIO (01/91-05/92)
EOP(GFZ) 92 P 02 48822-48883 654-662 ITRF90 SIO (IGSMail 56)
EOP(JPL) 92 P 01 48794-48821 650-653 ITRF90 JPL (GIG'91+VLBI vel.)
EOP(JPL) 92 P 02 48820-48890 654-663 ITRF91 IERS (IGSMail 90)
EOP(SIO) 92 P 03 48780-48897 648-664 ITRF90 SIO (51 IGS'92 days)
--------------------------------------------------------------------------------
3.2 - VLBI, LLR, SLR, GPS EOP DETERMINATIONS: AGREEMENT WITH THE IERS SYSTEM
In this section, the VLBI, LLR, SLR, and GPS observations available over the
time
period of the IGS'92 Campaign (MJD 48779-48893) are compared to the IERS series
EOP(IERS) 90 C 04, which is a combination of the series of Table 2.
Table 2 - IERS OPERATIONAL SERIES OF EOP
------------------------------------------------------------------------
Techn. Series Time Time EOP determined
span interv.
------------------------------------------------------------------------
VLBI EOP(NOAA) 92 R 01 24 h 3/4 d x, y, UT1, dPsi, dEps
VLBI EOP(NOAA) 92 R 02 1 h 1/2 d UT1
VLBI EOP(USNO) 92 R 03 24 h 7 d x, y, UT1, dPsi, dEps
LLR EOP(UTXMO) 92 M 02 1 h 0.1/30 d UT1
SLR EOP(CSR) 91 L 01 72 h 3 d x, y, "UT1"
SLR EOP(DUT) 91 L 02 120 h 5 d x, y, "UT1"
------------------------------------------------------------------------
The GPS series are those listed in Table 1. They give the x,y coordinates
of the pole, except CODE, which gives a series of UT1 that is tied at the
beginning of the complete series to an a priori value.The "UT1" determinations
obtained by the SLR Analysis Centre at DUT is left free, whereas in the CSR
SLR solution, it is tied to a VLBI solution for periods longer than about 60
days.
The GPS results are obtained from one-day observations of 16 to 18 satellites
in a network of 11 to 29 stations: 14-19 for CODE, 14-20 for CSR, 17-18 for EMR,
11-18 for ESOC, 22-27 for JPL, and 17-29 for SIO.
Most of the centres treat independently the successive daily arcs, the
exceptions being CODE (three-day overlapping arcs) and GFZ (two-day
overlapping arcs). The centres estimate the EOP at 12h UT.
Table 3 gives the differences of the VLBI, SLR,and GPS series with
EOP(IERS) 90 C 04 under the form of a constant bias, corrected for the predicted
value of the systematic difference. In the case of the GPS results, which are
referred directly to ITRF, the predicted bias and its uncertainty are derived
from Table I-3, p.II-13 of the 1991 IERS Annual Report. It reflects the slight
misalignment of the IERS EOP relative to the IERS terrestrial frame. In the
case of the SLR and VLBI results, the expected values are derived from
analyses of previous years results.
Table 3 - SYSTEMATIC DIFFERENCES OF EOP RESULTS WITH IERS
--------------------------------------------------------------------------------
Techn Series x (0.001") y(0.001") UT1(0.0001s) Nmes
--------------------------------------------------------------------------------
VLBI EOP(NOAA) 92 R 01 0.35 +- 0.09 0.17 +- 0.14 0.18 +- 0.08 31
VLBI EOP(NOAA) 92 R 02 0.17 +- 0.09 83
VLBI EOP(USNO) 92 R 03 0.16 +- 0.15 0.26 +- 0.19 0.45 +- 0.16 18
LLR EOP(UTXMO)92 M 02 -0.39 +- 0.32 15
SLR EOP(CSR) 91 L 01 0.52 +- 0.13 0.55 +- 0.11 0.03 +- 0.25 39
SLR EOP(DUT) 91 L 02 0.07 +- 0.26 -0.23 +- 0.33 24
GPS EOP(CODE) 92 P 04 -0.05 +- 0.36 0.01 +- 0.45 102
GPS EOP(CSR) 92 P 01 0.23 +- 0.37 2.60 +- 0.48 69
GPS EOP(EMR) 92 P 01 -0.12 +- 0.45 1.39 +- 0.46 36
GPS EOP(ESOC) 92 P 01 1.45 +- 0.38 0.11 +- 0.48 98
GPS EOP(GFZ) 92 P 01 -2.41 +- 0.43 -3.06 +- 0.56 27
GPS EOP(GFZ) 92 P 02 +1.78 +- 0.36 1.85 +- 0.45 56
GPS EOP(JPL) 92 P 01 0.28 +- 0.38 1.73 +- 0.50 28
GPS EOP(JPL) 92 P 02 0.47 +- 0.35 0.27 +- 0.45 59
LOD : 0.01 +- 0.15 22
GPS EOP(SIO) 92 P 03 1.65 +- 0.21 2.26 +- 0.52 109
--------------------------------------------------------------------------------
3.3 - GPS: FORMAL AND ESTIMATED UNCERTAINTIES
The correlation of high frequency variations in the GPS polar motion results
was estimated on the basis of the residuals of each series of daily values
relative to its own smoothing (frequency cutoff: 1 cycle/8 days). The common
time intervals between two series cover 17 to 60 days. No significant
correlation was found.
Using the days which are common to pairs of series without change of reference
system, we estimate the true uncertainty of the daily EOP values by the Allan
variance (or pair variance) based on the 15 series of differences two by two
(see the 1991 IERS Annual Report, p.II-52). Table 4 shows the uncertainties
thus estimated for every GPS series, together with the corresponding rms
formal uncertainty provided by the Processing Centre.
Table 4 - ESTIMATED AND FORMAL UNCERTAINTY OF DAILY GPS POLAR MOTION VALUES
------------------------------------------------------------------------
Techn Series x (0.001") y(0.001") Nmes
estim. formal estim. formal
------------------------------------------------------------------------
GPS EOP(CODE) 92 P 04 0.35 0.13 0.38 0.14 75
GPS EOP(CSR) 92 P 01 0.59 0.20 0.69 0.20 75
GPS EOP(EMR) 92 P 01 0.52 0.55 0.33 0.38 32
GPS EOP(ESOC) 92 P 01 1.02 0.37 1.14 0.42 75
GPS EOP(GFZ) 92 P 01 1.09 0.86 1.11 0.89 26
GPS EOP(GFZ) 92 P 02 0.76 0.49 0.38 0.54 32
GPS EOP(JPL) 92 P 01 0.37 0.25 0.47 0.30 26
GPS EOP(JPL) 92 P 02 0.11 0.18 0.11 0.19 32
GPS EOP(SIO) 92 P 03 0.36 0.26 0.66 0.27 75
------------------------------------------------------------------------
3.4 - VLBI, LLR, SLR, GPS EOP DETERMINATIONS: DAY-TO-DAY AGREEMENT WITH IERS
The series of EOP obtained by VLBI, LLR, SLR and GPS already considered in
Table 3
are considered now under the form of the weighted rms residual to
EOP(IERS) 90 C 04, after the biases of Table 2 are taken out. The statistics
are listed in Table 5.
Table 5 - WEIGHTED RMS DIFFERENCES OF EOP RESULTS WITH EOP(IERS) 90 C 04
The biases of Table 3 are taken out.
--------------------------------------------------------------------------------
Techn Series x (0.001") y(0.001") UT1(0.0001s) Nmes
--------------------------------------------------------------------------------
VLBI EOP(NOAA) 92 R 01 0.46 0.64 0.43 31
VLBI EOP(NOAA) 92 R 02 0.45 83
VLBI EOP(USNO) 92 R 03 0.30 0.42 0.38 18
LLR EOP(UTXMO)92 M 02 1.09 15
SLR EOP(CSR) 91 L 01 0.43 0.45 0.74 (1) 39
SLR EOP(DUT) 91 L 02 0.89 0.96 1.91 (2) 29
GPS EOP(CODE) 92 P 04 0.84 0.88 0.84 (3) 102
GPS EOP(CSR) 92 P 01 0.90 1.56 69
GPS EOP(EMR) 92 P 01 1.71 0.89 36
GPS EOP(ESOC) 92 P 01 1.41 1.74 98
GPS EOP(GFZ) 92 P 01 1.30 1.78 27
GPS EOP(GFZ) 92 P 01 0.73 0.65 56
GPS EOP(JPL) 92 P 01 0.81 1.24 28
GPS EOP(JPL) 92 P 02 0.39 0.47 59
LOD : 0.72 22
GPS EOP(SIO) 92 P 03 0.65 0.55 109
--------------------------------------------------------------------------------
Notes : 1 - CSR - Referred to VLBI in the long term ( p > 60 d ).
2 - DUT - With a drift of +0.026 ms/d and a quadratic term taken out.
3 - CODE - With a drift of +0.043 ms/d, a quadratic term
and a 68d term taken out.
==============================================================================
^From: Carey Noll/CDDIS
Subject: CDDIS GPS Data Holdings for IGS Week 17/GPS Week 0665
---------------------------------------------------------------
Current IGS GPS Data Holdings (as of 14-Oct-92 12:10)
IGS Week 17/GPS Week 0665 (October 04 thru 10, 1992; Days 278 thru 284)
2 2 2 2 2 2 2
Mon. 7 7 8 8 8 8 8 No.
Site Name Name Receiver 8 9 0 1 2 3 4 Sites
------------------ ---- -------- --- --- --- --- --- --- --- -----
Albert Head ALBH Rogue X X X X X X X 7
Algonquin ALGO Rogue X X X X X X X 7
Fairbanks FAIR Rogue X X X X X X X 7
Goldstone GOLD Rogue X X X X X X X 7
Graz GRAA Ashtech X X X X X X X 7
Graz GRAZ Rogue X X X X X X X 7
Hartebeesthoek HART Rogue X X X X X X X 7
Harvest Platform HARV Rogue X - - - X - - 2
Herstmonceux HERS Rogue X X X X X X X 7
Hobart HOBA Minimac X X X X X X X 7
Kootwijk KOSG Rogue X X X X X X X 7
Madrid MADR Rogue X X - X X X X 6
Maspalomas MASP Rogue X X X X X X X 7
Matera MATE Rogue X X X X X X X 7
McMurdo MCMU Rogue X - X X X X X 6
Metsahovi METS Rogue X X X X X X X 7
Ny Alesund NYAL Rogue X X X X X X X 7
Onsala ONSA Rogue X X X X X X X 7
Pamate PAMA Rogue X X X X X X X 7
Pasadena JPLM Rogue X X X X X X X 7
Penticton DRAO Rogue X X X X X X X 7
Quincy QUIN Rogue - X - X X - X 4
Saint John's STJO Rogue X X X X X X X 7
Santiago SANT Rogue X X - X X X X 6
Taiwan TAIW Rogue X X X X X X X 7
Tidbinbilla TIDB Rogue X X X X X X X 7
Townsville TOWN Trimble X X X X X X X 7
Tromso TROM Rogue X X X X X X X 7
Tsukuba TSUK Minimac - X X X X X X 6
Usuda USUD Rogue X X - X X X X 6
Wellington WELL Trimble X X X X X X X 7
Westford WES1 Minimac X X X X X X X 7
Wettzell WETT Rogue - X X X X X X 6
Yaragadee YAR1 Rogue X X X X X X X 7
Yellowknife YELL Rogue X X X X X X X 7
Zimmerwald ZIMM Trimble - - X X X X X 5
------------------ ---- -------- --- --- --- --- --- --- --- -----
Totals: 36 stations 32 33 31 35 36 34 35 236
Notes: CDDIS disk archive status:
GPS1:[GPSDATA] directory contains days 281 and on
GPS2:[GPSDATA] directory contains days 261 thru 280
GPS3:[PRODUCTS] directory contains IGS products
GPS3:[IGSMAIL] directory contains IGS MAIL messages and index
CIGNET has submitted SHANghai data to the CDDIS for days 207 thru 222.
Please advise the CDDIS if you wish copies of these data.
Beijing has submitted data from NANJing for days 206 thru 222 in
receiver format (Ashtech); CDDIS is currently reformatting the data.
Please advise the CDDIS if you wish copies of these data.
Mojave MiniMac receiver (MOJ1) has been moved to China; last observation
at Mojave was on Sept. 30.
==============================================================================
^From: Peter Pesec, Institute for Space Research, Graz, Austria
Subject: Status report IGS-site GRAZ and GRAA.
--------------------------------------------------------------
Measurements at GRAA (Ashtech P-code) have been terminated on
October 10th, 1992 and will not be resumed.
Measurements at GRAZ (ROGUE 8C) will be continued until further
notice. 2 data-gaps occurred on due to a receiver-breakdown and
during a remeasurement of the centering elements at the observa-
tory. Starting with day 289/1992 the receiver was switched back
to CONAN-3 in order to account for a proper data-recording during
AS. The switch to CONAN-4 will be done after the avilability of
the corrected software - hopefully mid of November.
The remeasurement of the centering elements gave the following
results (current mark minus central marker):
N E H
Laser (Az-El axis crossing): +0.760 m -8.890 m +1.097 m
GPS-site GRAZ (Rogue) : 0.000 m 0.000 m +2.068 m
GPS-site GRAA (Ashtech) : +3.381 m +0.910 m +1.852 m
The heights for the GPS-sites are referred to the physical bottom
of the antenna.
Best regards Peter Pesec
.
(
an unli
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