[IGSMAIL-67] EARTH ORIENTATION Bul. No 4.
IERS
IERS
Thu Aug 13 19:04:58 PDT 1992
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IGS Electronic Mail 13-AUG-1992 19:04:58 Message Number 67
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>From: IERS
Subject: EARTH ORIENTATION Bul. No 4.
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IGS'92 EARTH ORIENTATION BULLETIN 4
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12 AUGUST 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)
JUL 4 48807 -1392.0 3844.0 43823.8
JUL 5 48808 -1381.0 3863.0 43644.7
JUL 6 48809 -1368.0 3884.0 43469.1
JUL 7 48810 -1352.0 3907.0 43307.6
JUL 8 48811 -1334.0 3933.0 43164.8
JUL 9 48812 -1316.0 3959.0 43043.1
JUL 10 48813 -1299.0 3987.0 42937.2
JUL 11 48814 -1285.0 4016.0 42845.2
JUL 12 48815 -1276.0 4043.0 42759.4
JUL 13 48816 -1270.0 4066.0 42676.3
JUL 14 48817 -1266.0 4084.0 42588.8
JUL 15 48818 -1259.0 4100.0 42492.2
JUL 16 48819 -1248.0 4116.0 42383.6
JUL 17 48820 -1230.0 4134.0 42262.6
JUL 18 48821 -1206.0 4155.0 42128.5
JUL 19 48822 -1178.0 4179.0 41983.6
JUL 20 48823 -1151.0 4203.0 41829.6
JUL 21 48824 -1125.0 4226.0 41672.5
JUL 22 48825 -1102.0 4248.0 41516.4
JUL 23 48826 -1081.0 4270.0 41366.9
JUL 24 48827 -1062.0 4290.0 41226.3
JUL 25 48828 -1043.0 4310.0 41096.9
JUL 26 48829 -1025.0 4328.0 40976.2
JUL 27 48830 -1006.0 4347.0 40856.0
JUL 28 48831 -987.0 4365.0 40726.9
JUL 29 48832 -967.0 4385.0 40579.8
JUL 30 48833 -947.0 4406.0 40407.7
JUL 31 48834 -927.0 4430.0 40210.4
AUG 1 48835 -905.0 4455.0 39996.1
AUG 2 48836 -883.0 4479.0 39777.2
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.
2 -a - EOP(CODE) 92 P 02
Units : 0.0001" for x,y, 0.00001s for UT1.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
JUN 27 48800.50 -1471.2 3700.2 72.0 1.4 1.5
JUN 28 48801.50 -1443.3 3730.4 -55335.8 72.0 1.6 1.8 0.9
JUN 29 48802.50 -1433.7 3764.5 -55459.7 72.0 1.5 1.6 0.9
JUN 30 48803.50 -1420.1 3787.4 -55582.4 72.0 1.1 1.6 0.9
JUL 1 48804.50 -1409.0 3818.6 44276.9 72.0 1.0 1.4 0.8
JUL 2 48805.50 -1405.3 3840.3 44129.3 72.0 1.3 1.7 0.7
JUL 3 48806.50 -1384.0 3855.4 43960.7 72.0 1.0 1.4 0.7
JUL 4 48807.50 -1369.8 3874.9 72.0 1.0 1.0
JUL 5 48808.50 -1358.4 3901.8 43557.1 72.0 1.0 0.9 0.6
JUL 6 48809.50 -1348.4 3916.2 43397.9 72.0 0.9 0.8 0.5
JUL 7 48810.50 -1340.8 3936.3 43261.9 72.0 1.0 0.9 0.6
JUL 8 48811.50 -1320.0 3965.0 43146.7 72.0 0.8 0.8 0.6
JUL 9 48812.50 -1307.0 3997.4 43042.6 72.0 0.9 0.9 0.6
JUL 10 48813.50 -1283.5 4008.1 42957.3 72.0 1.0 1.2 0.6
JUL 11 48814.50 -1271.9 4035.6 72.0 1.0 1.0
JUL 12 48815.50 -1280.3 4060.3 42738.0 72.0 0.9 1.0 0.6
JUL 13 48816.50 -1266.4 4080.1 42644.4 72.0 1.0 1.1 0.6
JUL 14 48817.50 -1262.6 4096.8 42539.5 72.0 1.0 1.1 0.6
JUL 15 48818.50 -1236.1 4109.0 42430.6 72.0 0.9 1.0 0.6
JUL 16 48819.50 -1225.0 4128.9 42312.8 72.0 1.0 1.1 0.7
JUL 17 48820.50 -1206.6 4163.2 42181.6 72.0 1.4 1.8 0.7
JUL 18 48821.50 -1194.0 4176.9 72.0 1.8 1.7
JUL 19 48822.50 -1165.1 4189.4 41930.3 72.0 1.3 1.6 0.7
JUL 20 48823.50 -1133.7 4251.7 41783.6 72.0 1.0 1.4 0.7
JUL 21 48824.50 -1092.2 4269.5 41637.7 72.0 1.1 1.5 0.6
JUL 22 48825.50 -1083.8 4277.3 41497.4 72.0 1.0 1.6 0.7
JUL 23 48826.50 -1073.0 4278.2 41366.4 72.0 1.0 1.2 0.7
JUL 24 48827.50 -1045.4 4300.7 41237.9 72.0 0.9 1.0 0.6
JUL 25 48828.50 -1031.5 4327.4 41113.4 72.0 1.0 1.2 0.6
2 -b - EOP(CSR) 92 P 01
Units : 0.0001" for x,y, 0.00001s for UT1.
A recent description of this analysis can be found in IGSMail 62.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
JUL 9 48812.50 -1293.2 4009.5 428 1.5 1.6
JUL 10 48813.50 -1286.5 4037.5 304 2.4 2.7
JUL 11 48814.50 -1272.3 4065.8 385 1.4 1.6
JUL 12 48815.50 -1273.2 4098.0 392 1.5 1.8
JUL 13 48816.50 -1259.7 4120.3 408 1.6 1.9
JUL 14 48817.50 -1246.6 4143.8 357 1.7 2.5
JUL 15 48818.50 -1248.4 4145.7 351 2.0 2.1
JUL 16 48819.50 -1228.0 4163.4 364 1.8 1.8
JUL 17 48820.50 -1229.7 4174.8 320 2.2 2.8
JUL 18 48821.50 -1198.3 4189.4 368 2.3 2.7
JUL 19 48822.50 -1180.9 4206.4 392 2.1 2.4
JUL 20 48823.50 -1138.1 4256.9 418 1.5 1.6
JUL 21 48824.50 -1102.9 4301.6 393 1.7 2.5
JUL 22 48825.50 -1082.7 4323.7 390 1.8 2.2
JUL 23 48826.50 -1071.8 4325.6 367 1.9 1.9
JUL 24 48827.50 -1045.0 4352.9 400 1.7 1.7
JUL 25 48828.50 -1021.1 4365.1 397 1.5 1.5
2 -c - EOP(ESOC) 92 P 01
Units : 0.0001" for x,y, 0.00001s for UT1.
A recent description of this analysis can be found in IGSMail 62.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
JUN 21 48794.50 -1506.7 3528.1 24.0 2.6 3.1
JUN 22 48795.50 -1495.4 3565.3 24.0 2.2 2.3
JUN 23 48796.50 -1499.8 3577.9 24.0 2.3 2.4
JUN 24 48797.50 -1504.9 3576.1 24.0 3.2 3.9
JUN 25 48798.50 -1491.9 3624.7 24.0 2.8 3.6
JUN 26 48799.50 -1466.4 3664.1 24.0 2.6 2.8
JUN 27 48800.50 -1449.1 3688.7 24.0 2.6 2.9
JUN 28 48801.50 -1431.2 3688.4 24.0 3.1 3.7
JUN 29 48802.50 -1431.3 3751.5 24.0 2.7 2.9
JUN 30 48803.50 -1421.3 3766.5 24.0 2.8 3.1
JUL 1 48804.50 -1398.3 3809.6 24.0 3.7 4.2
JUL 2 48805.50 -1385.0 3835.6 24.0 2.6 2.9
JUL 3 48806.50 -1397.5 3861.8 24.0 3.7 4.2
JUL 4 48807.50 -1369.6 3852.9 24.0 3.7 4.3
JUL 5 48808.50 -1367.6 3893.1 24.0 4.3 4.5
JUL 6 48809.50 -1347.7 3903.2 24.0 2.9 3.3
JUL 7 48810.50 -1345.5 3883.8 24.0 5.6 5.9
JUL 8 48811.50 -1287.0 3928.2 24.0 3.3 3.8
JUL 9 48812.50 -1290.1 3944.3 24.0 3.9 4.7
JUL 10 48813.50 -1275.5 3984.6 24.0 4.4 5.6
JUL 11 48814.50 -1254.1 4003.6 24.0 4.4 5.2
JUL 12 48815.50 -1271.5 4028.8 24.0 8.1 9.0
JUL 13 48816.50 -1259.3 4032.2 24.0 5.0 6.8
JUL 14 48817.50 -1278.5 4071.6 24.0 4.1 4.8
JUL 15 48818.50 -1210.7 4132.3 24.0 6.3 7.5
JUL 16 48819.50 -1204.2 4148.7 24.0 3.9 4.6
JUL 17 48820.50 -1178.8 4178.0 24.0 4.9 7.7
JUL 18 48821.50 -1171.9 4179.0 24.0 5.9 9.3
JUL 19 48822.50 -1126.8 4222.5 24.0 3.8 5.2
JUL 20 48823.50 -1121.5 4259.0 24.0 4.3 5.3
JUL 21 48824.50 -1088.6 4267.0 24.0 3.5 3.5
JUL 22 48825.50 -1087.3 4288.9 24.0 3.5 4.1
JUL 23 48826.50 -1061.9 4289.8 24.0 4.7 4.6
JUL 24 48827.50 -1055.4 4327.2 24.0 3.7 4.0
JUL 25 48828.50 -1009.5 4328.6 24.0 3.5 3.7
JUL 26 48829.50 -995.8 4347.5 24.0 4.9 4.9
JUL 27 48830.50 -987.7 4395.1 24.0 3.5 3.7
JUL 28 48831.50 -966.7 4395.9 24.0 3.9 4.1
JUL 29 48832.50 -931.4 4383.1 24.0 4.0 4.6
JUL 30 48833.50 -945.2 4420.5 24.0 4.7 5.0
JUL 31 48834.50 -892.8 4490.5 24.0 3.8 3.8
2 -d - EOP(GFZ) 92 P 01
Units : 0.0001" for x,y, 0.00001s for UT1.
A recent description of this analysis can be found in IGSMail 60.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
JUN 28 48801.00 -1475.0 3711.0 10.0 10.0
JUN 29 48802.00 -1468.0 3738.0 10.0 10.0
JUN 30 48803.00 -1442.0 3768.0 10.0 10.0
JUL 1 48804.00 -1467.0 3791.0 10.0 10.0
JUL 2 48805.00 -1430.0 3813.0 10.0 10.0
JUL 3 48806.00 -1415.0 3836.0 10.0 10.0
JUL 4 48807.00 -1435.0 3858.0 10.0 10.0
JUL 5 48808.00 -1401.0 3866.0 8.0 9.0
JUL 6 48809.00 -1405.0 3852.0 7.0 8.0
JUL 7 48810.00 -1389.0 3875.0 7.0 8.0
JUL 8 48811.00 -1357.0 3908.0 7.0 7.0
JUL 9 48812.00 -1321.0 3945.0 6.0 7.0
JUL 10 48813.00 -1306.0 3978.0 8.0 8.0
JUL 11 48814.00 -1308.0 3992.0 8.0 10.0
JUL 12 48815.00 -1300.0 3997.0 6.0 6.0
JUL 13 48816.00 -1300.0 4033.0 6.0 7.0
JUL 14 48817.00 -1290.0 4054.0 6.0 6.0
JUL 15 48818.00 -1277.0 4074.0 6.0 7.0
JUL 16 48819.00 -1248.0 4100.0 7.0 7.0
JUL 17 48820.00 -1238.0 4119.0 7.0 8.0
JUL 18 48821.00 -1209.0 4130.0 6.0 8.0
2 -e - EOP(JPL) 92 P 01
Units : 0.0001" for x,y, 0.00001s for UT1.
A recent description of this analysis can be found in IGSMail 55.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
JUN 28 48801.50 -1450.6 3757.1 2.8 3.7
JUN 29 48802.50 -1428.5 3790.5 2.6 3.2
JUN 30 48803.50 -1417.1 3809.0 2.2 2.6
JUL 1 48804.50 -1403.0 3837.6 2.2 2.7
JUL 2 48805.50 -1393.3 3862.2 2.3 2.8
JUL 3 48806.50 -1385.0 3870.2 2.4 3.1
JUL 4 48807.50 -1371.5 3897.0 2.7 3.4
JUL 5 48808.50 -1356.9 3917.1 2.6 3.1
JUL 6 48809.50 -1340.6 3939.9 2.3 2.8
JUL 7 48810.50 -1327.1 3946.4 2.7 3.2
JUL 8 48811.50 -1306.2 3984.7 2.3 2.7
JUL 9 48812.50 -1299.4 3996.6 2.9 3.6
JUL 10 48813.50 -1286.8 4026.4 2.8 3.5
JUL 11 48814.50 -1270.7 4058.8 2.1 2.5
JUL 12 48815.50 -1265.1 4086.5 2.4 2.9
JUL 13 48816.50 -1269.2 4105.5 2.3 2.8
JUL 14 48817.50 -1258.0 4129.0 2.5 2.9
JUL 15 48818.50 -1245.1 4130.1 2.5 2.9
JUL 16 48819.50 -1235.8 4153.3 2.4 2.7
JUL 17 48820.50 -1213.1 4175.4 2.5 2.9
JUL 18 48821.50 -1192.3 4188.0 3.0 3.5
2 -f - EOP(JPL) 92 P 02
Units : 0.0001" for x,y, 0.00001s for UT1.
A recent description of this analysis can be found in IGSMail 62.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
JUL 17 48820.50 -1208.7 4156.5 1.3 1.2
JUL 18 48821.50 -1179.0 4174.0 1.5 1.2
JUL 19 48822.50 -1156.7 4202.3 1.4 1.2
JUL 20 48823.50 -1126.5 4231.6 1.0 1.0
JUL 21 48824.50 -1100.2 4254.3 1.1 1.3
JUL 22 48825.50 -1082.2 4273.8 1.0 1.2
JUL 23 48826.50 -1064.0 4290.2 1.1 1.3
JUL 24 48827.50 -1042.5 4312.4 1.0 1.1
JUL 25 48828.50 -1018.5 4333.6 1.0 1.1
2 -g - EOP(SIO) 92 P 03
Units : 0.0001" for x,y, 0.00001s for UT1.
A recent description of this analysis can be found in IGSMail 64.
Date Uncertainties
1992 MJD x y UT1-UTC Passes Span x y
UT1-UTC
hours
JUL 12 48815.50 -1261.4 4089.8 1.5 2.0
JUL 13 48816.50 -1250.4 4110.5 1.4 1.6
JUL 14 48817.50 -1252.0 4115.2 1.7 2.0
JUL 15 48818.50 -1241.4 4138.3 1.6 1.7
JUL 16 48819.50 -1228.5 4155.5 1.7 1.9
JUL 17 48820.50 -1200.0 4176.1 2.0 2.0
JUL 18 48821.50 -1182.4 4187.8 2.7 2.8
JUL 19 48822.50 -1154.2 4214.5 2.1 2.0
JUL 20 48823.50 -1130.6 4239.9 2.4 2.5
JUL 21 48824.50 -1095.8 4268.2 1.7 1.9
JUL 23 48826.50 -1064.6 4313.5 1.3 1.4
JUL 24 48827.50 -1044.1 4330.6 1.4 1.4
JUL 25 48828.50 -1014.0 4350.4 1.6 1.7
JUL 26 48829.50 -998.5 4368.2 1.6 1.7
JUL 27 48830.50 -973.7 4391.3 1.3 1.4
JUL 28 48831.50 -956.5 4414.2 1.4 1.5
JUL 29 48832.50 -940.6 4428.8 1.6 1.8
JUL 30 48833.50 -925.4 4453.1 1.8 1.6
JUL 31 48834.50 -894.7 4469.8 1.2 1.3
3 - COMPARISONS OF GPS, 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 STRATEGIES
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 3.1
our understanding of these strategies according to the Centres and to the time
periods. Table 3.2 lists the status of the site positions in the various
analyses. It is reminded that the ITRF91 coordinates provided by Altamimi and
Boucher in IGSMail 33 are brought to 1992.5 by means of the combined SLR-VLBI
velocity field associated to ITRF91 (see the 1991 IERS Annual Report, mailed
early August 1992).
Table 3.1 - HISTORY OF THE TERRESTRIAL FRAME ORIENTATION STRATEGIES.
-------------------------------------------------------------------------------
Series MJD GPS Nominal Fiducials
(IERS label) from to weeks refrnce Nb source
-------------------------------------------------------------------------------
EOP(CODE) 92 P 01 48792-48800 650-650 ITRF90 9 IERS + AM0-2
EOP(CODE) 92 P 02 48800-48828 651-654 ITRF91 9 IERS (IGSMail 33)
EOP(CSR) 92 P 01 48794-48828 650-654 ITRF91 8 IERS (IGSMail 33)
EOP(ESOC) 92 P 01 48794-48800 650-650 ITRF91 8 IERS (IGSMAil 33)
EOP(ESOC) 92 P 01 48801-48821 651-653 ITRF91 5 IERS (IGSMail 33)
EOP(ESOC) 92 P 01 48722-48834 654-655 ITRF91 6 IERS (IGSMail 33)
EOP(GFZ) 92 P 01 48794-48821 650-653 ITRF90 9 SIO (01/91-05/92)
EOP(JPL) 92 P 01 48794-48821 650-653 ITRF90 3 JPL (GIG'91+VLBI vel.)
EOP(JPL) 92 P 02 48820-48828 654-654 ITRF91 8 IERS (IGSMail 33)
EOP(SIO) 92 P 03 48780-48834 648-655 ITRF90 26 SIO (51 IGS'92 days)
--------------------------------------------------------------------------------
Table 3.2 - STATUS OF THE SITE POSITIONS IN THE ANALYSES FOR EOP
-----------------------------------------------------------------------------
........... Processing Centre ...............
CODE CSR ESOC GFZ JPL SIO
---------------------------------------------
Reference epoch (years-1900): 92.5 92.5 92.5 92.352 92.5 92.57
............................................................................
Site Name Name Site position status
CODE CSR ESOC GFZ JPL SIO
----------------------------------------------------------------------------
Albert Head ALBH e
Algonquin ALGO F F F F F F
Canberra CANB/DS40 e e e e e F
DS41 F
DS42 e
DARW e
Fairbanks FAIR e F F F F F
Goldstone GOLD/DS10 F F/e e e F
DS1B F
Graz GRAZ
Hartebeesthoek HART F e e/F F
Herstmonceux HERS F/e e
Hobart HOBA
Kokee Park KOKB F F e e/F
KOKR F F
Kootwijk KOSG e e F
Kourou KOUR
Madrid MADR/DS60 F e F F F
Mas Palomas MASP e e e e
Matera MATE F e e F
McMurdo MCMU e e e e e F
Metsahovi METS e F
Mojave MOJ1
Ny Alesund NYAL/NALL e e e F e F
Onsala ONSA F e F
Pamate PAMA e e e e e e
Pasadena MESA
JPL1 F
JPLB F
Penticton DRAO e e e e
Pinyon Flat PINY F e
PIN1 F
PINB F
Richmond RCMA e
Saint John's STJO e e
SIO1 F
SIO2 F
Santiago SANT e e e e/F e
Taiwan TAIW e e e e e F
Townsville TOWN
Tromso TROM F F e/F F
Tsukuba TSUK
Usuda USUD e e e F e F
Victoria PGC1
Wellington WELL
WestFord WES1
Wettzell WETT F F F
WTZ1 F
Yaragadee YAR1 F F F F e/F F
YellowkniFe YELL F e F F e F
Zimmerwald ZIMM
----------------------------------------------------------------------------
F: fixed e: estimated F/e: fixed or estimated
----------------------------------------------------------------------------
3.2 - VLBI, SLR, GPS EOP DETERMINATIONS: AGREEMENT WITH THE IERS SYSTEM
In this section, the GPS, SLR, and VLBI observations available over the time
period of the IGS'92 Campaign (MJD 48779-48834) are compared to the IERS series
EOP(IERS) 90 C 04, which is a combination of the series of Table 3.3. The
LLR series has only two results during the considered period, so it could not
be included in the comparisons.
Table 3.3 - 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 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 3.1. They GPS give the x,y coordinates
of the pole, except CODE, which gives a series of UT1 that is tied at the begin
ning of each week 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 satellies in
a network of 11 to 29 stations: 14-19 for CODE, 14-20 for CSR,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). GFZ estimates the pole coordinates at 0h UT as the mean of
three successive values at Oh UT in the treatment of the two-day arcs. All
other centres estimate the EOP at 12h UT.
Table 3.4 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 3.4 - 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 0.51 +- 0.15 0.36 +- 0.16 -0.20 +- 0.15 12
VLBI EOP(NOAA) 92 R 02 -0.21 +- 0.15 34
VLBI EOP(USNO) 92 R 03 0.04 +- 0.16 0.13 +- 0.21 0.14 +- 0.43 8
SLR EOP(CSR) 91 L 01 0.32 +- 0.16 0.43 +- 0.14 -0.29 +- 0.27 20
SLR EOP(DUT) 91 L 02 0.17 +- 0.19 -0.37 +- 0.26 6.68 +- 1.46 11
GPS EOP(CODE) 92 P 01 -0.78 +- 0.77 -0.77 +- 0.64 16.29 +- 0.52 9
GPS EOP(CODE) 92 P 02 0.00 +- 0.37 0.19 +- 0.48 2.45 +- 0.65 29
GPS EOP(CSR) 92 P 01 -0.01 +- 0.40 3.12 +- 0.51 35
GPS EOP(ESOC) 92 P 01 0.74 +- 0.39 -1.16 +- 0.57 41
GPS EOP(GFZ) 92 P 01 -2.57 +- 0.44 -2.98 +- 0.56 27
GPS EOP(JPL) 92 P 01 0.14 +- 0.38 1.81 +- 0.50 28
GPS EOP(JPL) 92 P 02 0.42 +- 0.36 0.14 +- 0.45 9
GPS EOP(SIO) 92 P 03 0.63 +- 0.36 1.87 +- 0.45 54
--------------------------------------------------------------------------------
3.3 - GPS: HIGH FREQUENCY CORRELATION IN POLAR MOTION
The correlation of high frequency variations in the GPS polar motion results
is estimated in Table 3.5, 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 periods between two series cover 20 to 38 days.
Table 3.5 - HIGH FREQUENCY CORRELATION OF DAILY GPS POLE COORDINATES
Left triangle: x Right triangle: y
-------------------------------------------------------------------------------
CSR ESOC GFZ JPL SIO CSR ESOC GFZ JPL SIO
-------------------------------------------------------------------------------
CODE 0.26 0.15 0.41 0.22 -0.15 -0.13 0.03 0.21 0.31 -0.09
CSR - -0.09 -0.13 0.05 0.13 - 0.23 0.01 0.19 0.02
ESOC - 0.46 0.61 0.15 - 0.25 0.22 0.01
GFZ - 0.25 0.22 - 0.31 -0.12
JPL - 0.45 - 0.12
-------------------------------------------------------------------------------
3.4 - GPS: FORMAL AND ESTIMATED UNCERTAINTIES
Using the 21 days which are common to the six series without change of
reference system (GPS weeks 651-653) 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). A similar
estimation is performed for the first week of CODE and the last week of JPL,
which cover 9 days each. Table 3.6 shows the uncertainties thus estimated for
every GPS series, together with the corresponding rms formal uncertainty
provided by the Processing Centre.
Table 3.6 - 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 01 0.47 0.18 0.76 0.23 9
GPS EOP(CODE) 92 P 02 0.29 0.11 0.37 0.13 21
GPS EOP(CSR) 92 P 01 0.68 0.20 0.75 0.22 21
GPS EOP(ESOC) 92 P 01 0.87 0.43 1.55 0.52 21
GPS EOP(GFZ) 92 P 01 0.97 0.82 0.50 0.86 21
GPS EOP(JPL) 92 P 01 0.23 0.25 0.32 0.30 21
GPS EOP(JPL) 92 P 02 0.19 0.12 0.45 0.12 9
GPS EOP(SIO) 92 P 03 0.50 0.18 0.54 0.20 21
------------------------------------------------------------------------
3.5 - VLBI, SLR, GPS EOP DETERMINATIONS: DAY-TO-DAY AGREEMENT WITH IERS
The series of EOP obtained by VLBI, SLR and GPS already considered in Table
3.4 are considered now under the form of the weighted rms residual to
EOP(IERS) 90 C 04, after the biases of Table 3.4 are taken out. The
statistics are listed in Table 3.7.
Table 3.7 - WEIGHTED RMS DIFFERENCES OF EOP RESULTS WITH EOP(IERS) 90 C 04
The biases of Table 3.4 are taken out.
--------------------------------------------------------------------------------
Techn Series x (0.001") y(0.001") UT1(0.0001s) Nmes
--------------------------------------------------------------------------------
VLBI EOP(NOAA) 92 R 01 0.34 0.47 0.39 12
VLBI EOP(NOAA) 92 R 02 0.40 34
VLBI EOP(USNO) 92 R 03 0.30 0.38 1.17 8
SLR EOP(CSR) 91 L 01 0.47 0.55 0.73 20
SLR EOP(DUT) 91 L 02 0.63 1.25 7.59 11
GPS EOP(CODE) 92 P 01 2.07 1.24 1.37 9
GPS EOP(CODE) 92 P 02 0.72 1.03 3.00 29
GPS EOP(CSR) 92 P 01 1.18 1.47 35
GPS EOP(ESOC) 92 P 01 1.24 2.35 41
GPS EOP(GFZ) 92 P 01 1.36 1.79 27
GPS EOP(JPL) 92 P 01 0.71 1.28 28
GPS EOP(JPL) 92 P 02 0.28 0.33 9
GPS EOP(SIO) 92 P 03 0.76 0.74 54
--------------------------------------------------------------------------------
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