[IGSMAIL-46] Preliminary look at GPS Earth orientation
Dennis
Dennis
Mon Jul 20 14:06:38 PDT 1992
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IGS Electronic Mail 20-JUL-1992 14:06:38 Message Number 46
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THIS FILE CONTAINS 6 MESSAGES
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>From: Dennis McCarthy
Subject: Preliminary look at GPS Earth orientation
-----------------------------------------
Date: 16 July 1992
An updated look at Earth orientation data submitted to the IERS
follows. Units are milliseconds of arc for x and y, and
milliseconds of time for UT1-UTC.
Contributor Data Span Points Mean Standard Deviation
(NEOS-GPS)
x y UT1-UTC x y UT1-UTC
U. of Texas 48794.0 11 -0.46 -0.71 0.62 2.33
-48800.5
Scripps 48779.5 29 -0.89 -0.75 0.85 0.95
-48808.0
U. of Berne 48792.5 8 -0.42 0.34 -1.50 1.85 1.87 0.14
(ITRF90) -48799.5
U. of Berne 48800.5 8 -0.72 -0.62 -0.44 0.89 0.87 0.10
(ITRF91) -48807.5
JPL 48794.5 18 -0.95 -1.60 0.99 1.80
-48811.5
Plots are available by FAX to anyone interested.
Regards,
Dennis McCarthy
dmc at maia.usno.navy.mil
==============================================================================
>From: Carey Noll
Subject: CDDIS GPS Data Holdings for IGS Week 3/GPS Week 652
------------------------------------------------------------------
Current IGS GPS Data Holdings (as of 16-Jul-92 11:07)
IGS Week 3/GPS Week 652 (July 05 thru July 11, 1992; Days 187 thru 193)
1 1 1 1 1 1 1
Mon. 8 8 8 9 9 9 9 No.
Site Name Name Receiver 7 8 9 0 1 2 3 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 DS10 ROGUE 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
Herstmonceux HERS ROGUE X X X 3 *
Hobart HOBA MINIMAC X X X X X X X 7 *
Kokee Park KOKB ROGUE X X X X X X X 7
Kootwijk KOSG ROGUE X X X X X X X 7
Madrid DS60 ROGUE X X X X X X X 7
Mas Palomas 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 *
Mojave MOJ1 MINIMAC X X X X X X X 7 *
Ny Alesund NYAL/NALL 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 MESA ROGUE X X X X X X 6
Penticton DRAO ROGUE X X X X X X X 7
Pinyon Flat PINY ROGUE X X X X X X X 7
Richmond RCMA MINIMAC X X X X X X X 7 *
Saint John's STJO ROGUE X X X X X X X 7
Santiago SANT ROGUE X X X X X X X 7
Taiwan TAIW ROGUE X X X X X 5 *
Tidbinbilla DS40 ROGUE X X X X X X X 7
Townsville TOWN TRIMBLE X X X X X X 6 *
Tromso TROM ROGUE X X X X X X X 7 *
Tsukuba TSUK MINIMAC X X X X X X X 7 *
Usuda USUD ROGUE X X X X X X X 7
Victoria PGC1 ROGUE X X X 3
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 X 7 *
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 X X 7
------------------ ---- ---------- -- -- -- -- -- -- -- -----
Totals: 38 stations 38 36 36 36 34 36 37 253
Notes: * indicates some data replaced by CIGNET on July 15 because of error
in the RINEX version number (days 188 through 194)
Data from DARWin station has arrived at CDDIS for days 169 to 177
from AUSLIG via Peter Morgan. Additional Darwin plus Orroral data
expected in near future.
==============================================================================
>From: Ch. Reigber
Subject: Report for GPS Week 650 (Days 173-179) from GFZ
------------------------------------------------
This report is generated by the GeoForschungsZentrum Potsdam (GFZ)
on a weekly basis for the International GPS Geodynamics Service (IGS).
PRODUCT SUMMARY
GFZ06507.EPH: GPS ephemerides for GPS Week 650 (SP3 format, pos. and vel.)
GFZ06507.ERP: Earth rotation parameter (UT1 corrections are not included)
GFZ06507.SUM: Summary file for reporting week
The above specified products are available at CDDIS. The ERP results are
additionally submitted to IERS Central Bureau and IERS Sub Bureau for Rapid
Service and Predictions.
CORE STATION SUMMARY
The Core Station data used in the solutions is given below.
Day of Week 650
S M T W T F S
U O U E H R A
Site N N E D U I T
Name Code
---------------------------------------------------------
Algonquin ALGO X X X X X X X
Fairbanks FAIR X X X X X X X
Goldstone GOLD X X X - X X X
Hartebeesthoek HART X X - - X - X
Kokee Park KOKB X X X X - - -
Mc Murdo MCMU X X X X X X X
Ny-Alesund NYAL X X X X X X X
Pamatai PAMA - X X X X X X
Santiago SANT X X X X X X X
Taipei TAIW - - X X X X X
Tromsoe TROM X X X X X X X
Usuda USUD X X X X X X X
Wettzell WETT X X X X X X X
Yellowknife YELL X X X X X X X
Yarragadee YAR1 X X X X X X X
---------------------------------------------------------
SOLUTION CHARACTERISTICS
1. Analysis Center: GFZ/DLR
2. Analysing Team: D. Angermann, R. Galas, Th. Nischan,
Ch. Reigber, S.Y. Zhu
3. Solution Identifier: EPH(GFZ)92G01-DDD
ERP(GFZ)92G01-DDD
CLK(GFZ)92G01-DDD (only relative)
4. Software used: GEPARD4.0
5. Defintion of Terrestrial Reference Frame
Origin: Nominally ITRF-90
Orientation: Nominally ITRF-90
Reference Epoch: 1992.352 (MJD 48750)
Fixed set of stations: Y. Bock Solution (IGS Message No.35)
ALGO, YELL, FAIR, KOKR, TROM, WEZ1, YAR1, USUD, NALL
6. Data used:
- undifferenced pseudo ranges and carrier phases
- 2-day arc solutions with one day overlap
7. Adjusted parameters:
- State vector of all GPS satellites
- Daily polar motion
- Coordinate corrections for non-fixed stations
- Troposheric zenith path delay
- Solar radiation scale and y-bias
- Ambiguities
- ST and SV clock parameters of each observation epoch (the
maser-based clock at Fairbanks is taken as reference clock)
SOLUTION STATISTICS
Arc No. 0 1 2 3 4 5 6
------------------------------------------------------------------------
Number of observations 32817 28814 25957 25946 28223 30366 32672
RMS of carrier phases [cm] 4.1 4.0 4.6 4.4 3.5 2.8 3.1
RMS of code measurements [cm] 70.1 67.5 46.9 45.1 44.7 44.3 44.6
------------------------------------------------------------------------
INFORMATIONS TO PRODUCT GENERATION
The calculation of the 7-day ephemerides file is described below.
Day of GPS Week 650 [Day 0=Sunday; Day 6=Saturday]
Arc No. 0 1 2 3 4 5 6
0 XXXX----
1 XXXX----
2 XXXX----
3 XXXX----
4 XXXX----
5 XXXX----
6 XXXX----
XXXX : The first day of the 2-day arc is used for ephemeris
dissemination
---- : The second day is used for quality control by overlap
The pole coordinates are estimated for three epochs (beginning
of each day) with the 2-day arc's. Using the above described
method (one day overlaps) there are three solutions for each
pole parameter. The submitted ERP-results are the mean values
of these different solutions.
- GFZ06507.EPH (Seven 1-day segments)
In the table below the overlap rms differences [m] in radial,
cross- and along-track component are presented.
prn 174 175 176 177 178 179
======================================================
2 radial 0.654 0.288 0.200 0.310 0.235 0.329
2 cross 0.802 0.917 0.645 0.733 0.511 0.667
2 along 1.403 0.877 1.194 0.889 0.576 0.636
------------------------------------------------------
3 radial 0.337 0.197 0.466 0.365 0.196 0.274
3 cross 1.082 0.698 0.937 0.874 0.766 0.460
3 along 0.684 0.725 1.056 0.899 0.492 0.598
------------------------------------------------------
11 radial 0.561 0.857 1.261 0.598 0.326 0.285
11 cross 0.693 1.087 2.158 1.471 0.546 0.417
11 along 1.143 1.647 2.728 1.032 1.006 0.473
------------------------------------------------------
12 radial 0.651 0.997 1.475 0.322 0.158 0.197
12 cross 1.056 1.057 1.731 0.697 0.523 0.924
12 along 2.132 1.815 3.376 0.668 0.597 0.539
------------------------------------------------------
13 radial 0.337 0.400 0.216 0.142 0.240 0.251
13 cross 0.701 0.461 0.480 0.765 0.507 0.159
13 along 1.081 0.908 0.980 0.688 0.691 0.478
------------------------------------------------------
14 radial 0.928 0.759 1.089 1.178 0.854 0.627
14 cross 0.823 0.906 1.077 1.329 0.707 0.869
14 along 1.892 1.654 2.062 2.170 1.690 1.196
------------------------------------------------------
15 radial 0.243 0.300 0.470 0.236 0.376 0.212
15 cross 0.332 0.482 0.738 1.230 0.394 0.948
15 along 0.795 0.739 1.064 0.798 0.917 0.522
------------------------------------------------------
16 radial 0.375 0.895 1.230 1.243 0.751 0.584
16 cross 0.937 1.309 1.426 0.991 0.954 0.994
16 along 1.285 1.765 2.218 2.238 1.680 1.003
------------------------------------------------------
17 radial 0.253 0.312 0.714 0.384 0.415 0.227
17 cross 0.778 1.316 0.609 0.435 0.339 0.724
17 along 0.790 0.832 1.559 0.897 0.786 0.587
------------------------------------------------------
18 radial 0.544 0.129 0.564 0.398 0.176 0.221
18 cross 1.059 0.558 1.376 0.667 0.356 0.630
18 along 1.681 0.539 1.341 0.922 0.468 0.463
------------------------------------------------------
19 radial 0.429 0.621 0.551 0.341 0.270 0.374
19 cross 0.877 0.882 0.659 0.606 0.259 0.500
19 along 1.594 1.048 1.331 0.905 0.582 0.749
------------------------------------------------------
20 radial 0.146 0.127 0.574 0.160 0.352 0.374
20 cross 0.523 0.912 0.958 0.835 1.228 0.701
20 along 0.353 0.741 1.321 0.556 1.001 0.655
------------------------------------------------------
21 radial 0.223 0.286 0.181 0.418 0.374 0.117
21 cross 0.306 0.731 0.792 0.835 0.414 0.434
21 along 0.464 0.505 0.502 0.980 0.655 0.337
------------------------------------------------------
23 radial 0.180 0.165 0.200 0.227 0.096 0.085
23 cross 0.688 0.659 0.289 0.675 1.027 0.734
23 along 0.606 0.530 0.491 0.592 0.550 0.419
------------------------------------------------------
24 radial 0.400 0.382 0.298 0.455 0.319 0.309
24 cross 0.667 0.895 0.488 1.005 1.019 0.658
24 along 1.029 0.709 0.893 1.118 0.783 0.615
------------------------------------------------------
25 radial 0.461 0.263 0.314 0.319 0.420 0.461
25 cross 0.989 1.276 2.113 1.424 0.864 0.371
25 along 1.027 0.694 0.808 1.051 1.422 0.995
------------------------------------------------------
28 radial 0.346 0.529 0.274 0.851 0.316 0.285
28 cross 0.395 0.612 0.986 1.815 0.626 0.490
28 along 0.724 1.648 1.578 3.078 1.020 0.534
======================================================
- GFZ06507.ERP
MJD x sigmax y sigmay
48795 -.1555 .001 0.3531 .001
48796 -.1520 .001 0.3554 .001
48797 -.1511 .001 0.3592 .001
48798 -.1474 .001 0.3592 .001
48799 -.1524 .001 0.3673 .001
48800 -.1489 .001 0.3695 .001
- GFZ06507.CLK
The dissemination of clock corrections is under preparation.
==============================================================================
>From: IERS CENTRAL BUREAU
Subject: Bulletin number 2
*******************************************
* *
IGS'92 EARTH ORIENTATION BULLETIN 2
* *
*******************************************
17 JULY 1992
VERSION 1
============
This bulletin gives the description of the the Earth orientation analyses
performed by the IGS Processing Centres. Updated versions of it will be
distributed as new information becomes available. Each new version is as
complete as possible and supersedes the previous one.
-----------------------
PROCESSING CENTRE: CODE EOP(CODE) 92 P 01
-----------------------
DESCRIPTION OF ESTIMATION OF EARTH ROTATION PARAMETERS AT THE CODE
PROCESSING CENTER FOR IGS
M. Rothacher, G. Beutler, S. Fankhauser, W. Gurtner, L. Mervart,
E. Brockmann, S. Botton , T. Springer , T. Friedli, U.Wild
Outline of the Analysis
-----------------------
The orbits and the earth rotation parameters are estimated in the
same parameter estimation process at AIUB. Earth rotation parameters
and orbital elements are not the only parameters in this process. The
following parameter types are usually solved for:
(a) orbital parameters (in general 8 per satellite=6 elements,
2 radiation pressure parameters)
(b) tropospheric zenith corrections (in general 4 per day
and station)
(c) station coordinates for those stations with insufficient
coordinate/local tie information
(d) ambiguity parameters (at least one per day and satellite, in
general it is necessary to introduce more (after breaks, losses of
lock).
(e) earth rotation parameters.
At CODE, we process data in overlapping time intervals. We do this to keep
the reference system changes minimal. Each time interval consists of a
central day, and two adjacent time intervals (see Figure 1).
Figure 1: Processing in Overlapping Intervals at AIUB
-----------------------------------------------------
Interval Observations used
1 I-----I----------I-----I
2 I-----I----------I-----I
3 I-----I----------I-----I
. .....
.
-------I----------I----------I----------I------->
time
day 1 day 2 day 3 ...
We set up one set of pole parameters (dx,dy,dut) for the central day
and for each of the adjacent time intervals. The pole parameters
in our result file are those estimated for the central days.
At present the time intervals to the left and right of the central day
have a length of one day too, which means that we are actually analyzing
three day arcs in each case.
Whereas it is possible to solve for dx and dy of the pole with GPS
provided the pole in the inertial space (System J2000.0) is known
(what we assume in our ananlysis), the UT1-UTC term may only be
estimated relative to an arbitrary starting epoch. In our result file
the first value of UT1-UTC is taken from the a priori pole, the other
values are estimates relative to this first value. The a priori pole,
which defines the starting value for our UT1-UTC results, is of no
particular importance elsewhere. It is taken from the files distributed
by D. McCarthy through e-mail.
Models used
___________
We followed Prof. Clyde Goad's instructions as closely as possible
(a set of these instructions were sent to the IERS Directing
Board).
In summary we used
- the GEM-T3 (8,8) model (including the non-zero terms C21, S21 (!))
- the value GM=398.6004415d+12
- ae = 6378137.d0 m
- Gravitation by sun/moon
- the Rock 4, Rock42 models according to Fliegel, 1992 *)
- the y-bias *)
- solid tides
- correct handling of light <--> shadow changes (!)
*) only used as a priori, additional parameters estimated (one for
each effect).
The system J2000.0 was used as intertial system (for orbit integration).
The IAU 1980 models for precession and nutation are used without estimating
something in this context.
Crucial in the analysis are the station coordinates kept fixed (and
the excentricities at these points). Basically the ITRF90 system
(epoch 1988.0) is used as earth fixed system, our realization is (hopefully)
identical with the information distributed by the IGN (Paris) lately through
IGS e-mail.
It is worth being noted that at present six satellites are having earth shadow
transits. It is also clear that the orbits are not of the same quality for
these satellites as for the other ones. This circumstance also seems to affect
the determination of the earth rotation parameters. It may well be that in
future we will decide to reduce the arc length for eclipsing satellites.
================================================================================
-----------------------
PROCESSING CENTRE: CSR EOP(CRS) 92 P 01
-----------------------
EARTH ORIENTATION RESULTS SUBMITTED TO IERS
Prof. B. E. Schutz
schutz at utcsr.ae.utexas.edu
Dr. P. A. M Abusali
abusali at utcsr.ae.utexas.edu
Solution description
--------------------
1. Analysis Center: University of Texas/Center for Space Research
2. Solution Identifier: EOP(CSR) 92 P 01
3. Software used: MSODP1/TEXGAP
4. Definition of Terrestrial Reference Frame:
Origin: ITRF91
Orientation: ITRF91
Reference epoch: 1992.5
Relativity Scale: Geocentric (LE)
Speed of light: 299792458.0 m/sec
Geogravitational constant (GM) = 398600.4415 km^3/s^2
Permanent tidal correction: Applied for dynamic tides
Not applied to station coordinates
5. Station Coordinates: ITRF91 (IGS Message Number 33/Boucher and Altamimi)
6. UT1: not estimated, reference from UTX/CSR Lageos
7. Force Model: IERS Standards
8. Data: L1/L2 GPS phase, processed as double differences
9. Adjusted parameters:
One-day arcs with no apriori covariance on any parameters
Orbit parameters: 6 epoch elements, 2 nongravitational
force parameters for each satellite
Zenith delay parameter each 2.5 hr for each station
Double difference bias parameters
Pole position
Estimated Stations: MADR(DS60), SANT, KOSG, YELL, CANB(DS40),
MCMU, USUDA, NYAL, TAIW, MASP, PAMA
Solution characteristics (Report period:1992 June 21 - 27)
------------------------
Reference Frame: Defined by fixed stations in SLR (CSR91L03) and VLBI (GLB718)
Software: MSODP1/TEXGAP
Data: L1/L2 GPS phase sampled at 2 min., processed as double differences
Minimum Elevation: 15 degrees
Arc Length:
UTX06507.EPH: 7-day continuous arc
UTX06507.ERP: 1-day arcs
Adjusted Parameters:
6 epoch elements, nongravitational force parameters for each satellite
Zenith delay parameter each 2.5 hr for each station
Double difference bias parameters
Pole position (in one-day arcs)
================================================================================
----------------------
PROCESSING CENTRE: GFZ EOP(GFZ) 92 P 01
----------------------
ANALYSIS RESULTS FROM GFZ
Chris Reigber
Solution description
--------------------
1. Analysis Center: GFZ/DLR
2. Solution Identifier: EPH(GFZ)92G01-DDD
ERP(GFZ)92G01-DDD
CLK(GFZ)92G01-DDD (only relative)
3. Software used: GEPARD4.0
4. Defintion of Terrestrial Reference Frame
Origin: Nominally ITRF-90
Orientation: Nominally ITRF-90
Reference Epoch: 1992.352 (MJD 48750)
Fixed set of stations: Y. Bock Solution (IGS Message No.35)
ALGO, YELL, FAIR, KOKR, TROM, WEZ1, YAR1, USUD, NALL
5. Data used:
- undifferenced pseudo ranges and carrier phases
- 2-day arc solutions with one day overlap
6. Adjusted parameters:
- State vector of all GPS satellites
- Daily polar motion
- Coordinate corrections for non-fixed stations
- Troposheric zenith path delay
- Solar radiation scale and y-bias
- Ambiguities
- ST and SV clock parameters of each observation epoch (the
maser-based clock at Fairbanks is taken as reference clock)
================================================================================
----------------------
PROCESSING CENTRE: JPL EOP(JPL) 92 P 01
----------------------
JPL ANALYSIS RESULTS
J F Zumberge, F H Webb, U J Lindqwister, D C Jefferson, M B Heflin, G Blewitt
all at the Jet Propulsion Laboratory, California Institute
of Technology, Pasadena, CA 91109.
Tracking data from the global network of Rogue GPS receivers were analyzed
using the GIPSY/OASIS-II software, described in JPL internal documents.
(These documents are available on request.)
Data were analyzed in daily batches with 24-hour satellite arcs.
The measurements consist of undifferenced dual-frequency carrier phase
decimated to 6 minutes, and carrier-smoothed dual-frequency P-code
pseudorange. For both carrier phase and P-code, linear combinations of the
individual frequencies provide the ionosphere-free phase and pseudorange.
Data below 15 degrees elevation were not used.
Estimates of a 9-component state vector for each GPS satellite (3 parameters
each for position, velocity, and solar radiation pressure) were made, with
nominal values of position and velocity from the broadcast ephemeris. Weak a
priori constraints of 1 km and 10 mm/s for position and velocity, respectively,
were imposed.
Also estimated were 3-component position vectors for each terrestrial site.
Those for Fairbanks (Alaska,US), Algonquin Park (Ontario, Canada), and Madrid
(Spain) had a priori constraints of 0.1 mm, effectively making them fiducial
stations (see tables below, where they are identified by FAIR, ALGO, and MADR).
The ITRF'90 coordinates for these fiducial sites were realized by applying a
7- parameter similarity transformation of our GPS solution for the GIG'91
experiment into the ITRF'90 reference frame (see Blewitt et al., GRL vol. 19,
no. 9, May 4, 1992]. This transformation was estimated using 12 globally-
distributed stations, and resulted in a WRMS of 15 mm. These coordinates were
then mapped to epoch 1992.5 using VLBI-derived velocities of solution GLB718
[Ma, Ryan and Caprette, private comm., 1991] with the additional constraint
that the vertical velocities are zero (see 'Model B' in Blewitt et al. [1992]).
Since the fiducial coordinates define the reference frame of the orbits, they
are listed here.
Station Monument X [m] Y [m] Z [m]
ALGO ARO 883160 918129.5841 -4346071.2094 4561977.7947
FAIR Gilmore -2281621.3243 -1453595.7491 5756961.9449
Creek NCMN
MADR Top of 4849202.5864 -360329.2017 4114913.0940
choke ring
Coordinates for all other sites were loosely (1 km) constrained. The other
sites are Alberthead (Canada), Canberra (Australia), Goldstone (US),
Hartebeesthoek (S. Africa), Herstmonceaux (UK), JPL (US), Kootwijk
(Netherlands), Madrid (Spain), Matera (Italy), McMurdo (Antarctica), Metshovi
(Finland), Ny Allesund (Norway), Onsala (Sweden), Tahiti, Penticton (Canada),
Pacific Geoscience Centre (Canada), Pinyon Flat (US), Santiago (Chile),
Scripps (US), St. Johns (Canada), Taiwan, Tromso (Norway), Usuda (Japan),
Wettzell (Germany), Yaragadee (Australia), and Yellowknife (Canada).
The wet troposphere zenith delays at each site were modeled as a random walk
in time with a 1 cm^2/hour variance derivative, and were mapped to satellite
elevations using the Lanyi mapping function. Their nominal values were 0.1 m
at every site and were estimated with 500-m a priori constraints.
The zenith dry delays were assumed fixed at 2 m for every site, and were also
mapped to satellite elevations using the Lanyi mapping function. (Because the
wet and dry delays are nearly degenerate parameters, the estimated wet delay
in fact represents the combined delay which deviates from the nominal 2.1 m.)
Clocks for each station and satellite (except for the reference clock, taken
as the maser-based clock at Fairbanks, and believed accurate to ~1 microsecond
or better) were estimated as a white-noise process with updates every 6 minutes.
The carrier phase ambiguities were estimated as real-valued parameters.
Nominal values for X and Y polar motion and UT1R-UTC were obtained from
interpolation in the IERS Bulletin B predicted values. Estimates of polar
motion had weak (5-m) constraints, while UT1R-UTC was constrained (0.01 mm)
to be the nominal.
The Williams solid Earth tide model was used. Pole tide and ocean loading were
not modeled.
The Earth's gravity field was described by the GEM-T3 multipole expansion using
terms up through degree and order 8. (IERS-recommended values for C21 and S21
of -0.17E-09 and 1.19E-09 were also used.) The value of GM was taken as
398600.4415km^3/s^2.
Description of the Terrestrial System for Solution EOP(JPL) 92 P 01
-------------------------------------------------------------------
(1) Technique: GPS
(2) Analysis Center: JPL
(3) Solution identifier: EOP(JPL) 92 P 01
(4) Software used: GIPSY/OASIS-II
(5) Relativity scale: Local Earth
(6) Permanent tide correction: No
(7) Tectonic plate model: None (single epoch solution)
(8) Velocity of light 299792458 m/sec
(9) GM 3.986004415E+14 m^3/s^2
(10) Reference epoch 1992.5
(11) Adjusted parameters: Station X, Y, Z at 1992.5
PMX, PMY every 24 hours;
GPS epoch state and 3 solar
radiation biases every 24 hours;
Random walk zenith tropospheres;
White noise clocks (Fairbanks
H-maser is the reference clock);
Carrier phase ambiguities as
real valued (not bias-fixed)
(12) Definition of origin Defined though a realization of ITRF90
and by fixing gravity field to GEM-T3.
(13) Definition of orientation Defined through a realization of ITRF90
(14) Constraint for time-evolution No time evolution.
================================================================================
----------------------
PROCESSING CENTRE: SIO EOP(SIO) 92 P 01
----------------------
SIO ANALYSIS RESULTS
Yehuda Bock
The revised analysis described below is based on the analysis of the first 29
days of the IGS campaign.
1. Analysis Center: Scripps Institute of Oceanography
2. Solution Identifier: Preliminary Submission 920624
3. Software used: GAMIT/GLOBK
4. Definition of Terrestrial Reference Frame:
Origin: Nominally ITRF-90
Orientation: Nominally ITRF-90
Reference epoch: 1992.51 (MJD 48808.5)
Relativity Scale: Terrestrial
Velocity of light: 299792458.0 m/sec
Permanent tidal correction: None
5. Adjusted parameters:
(a) Double-difference data
(b) Single day orbit arcs, 6 ICs and 3 radiation parameters per
satellite-per-day
(c) One-per-day-per-station zenith tropospheric parameter,
(d) Bias parameters, one for each independent double difference
combination.
(e) Station positions with +- 10 m constraints at stations other
than: ALGO, YELL, PIN1, PINB, JPL1, JPLB, SIO1, SIO2, FAIR, KOKR,
USUD, DS10, DS1B, DS40, DS41, DS60, YAR1, MCMU, TAIW, ONSA, WTZ1,
METS, MATE, TROM, NALL, KOSG. For these stations constraints of
+0.001 m for horiziontal and +-0.005 m for the height were used.
(f) X and Y pole position once per day. No estimate is made of UT1-AT
since these deviations are absorbed into the orbital parameters.
==============================================================================
>From: Yehuda Bock
Subject: SIO analysis results
A) An error in our calender date to MJD routine caused our
earlier submissions to have MJD's 0.5 days greater than
they should have been. This error has now been corrected.
B) The revised analysis described below is based on the analysis
of the first 29 days of the IGS campaign.
1. Analysis Center: Scripps Institute of Oceanography
2. Solution Identifier: Preliminary Submission 920624
3. Software used: GAMIT/GLOBK
4. Definition of Terrestrial Reference Frame:
Origin: Nominally ITRF-90
Orientation: Nominally ITRF-90
Reference epoch: 1992.51 (MJD 48808.5)
Relativity Scale: Terrestrial
Velocity of light: 299792458.0 m/sec
Permanent tidal correction: None
5. Adjusted parameters:
(a) Double-difference data
(b) Single day orbit arcs, 6 ICs and 3 radiation parameters per
satellite-per-day
(c) One-per-day-per-station zenith tropospheric parameter,
(d) Bias parameters, one for each independent double difference
combination.
(e) Station positions with +- 10 m constraints at stations other
than: ALGO, YELL, PIN1, PINB, JPL1, JPLB, SIO1, SIO2, FAIR, KOKR,
USUD, DS10, DS1B, DS40, DS41, DS60, YAR1, MCMU, TAIW, ONSA, WTZ1,
METS, MATE, TROM, NALL, KOSG. For these stations constraints of
+0.001 m for horiziontal and +-0.005 m for the height were used.
(f) X and Y pole position once per day. (No estimate is made of UT1-
AT since these deviations are absorbed into the orbital parameters).
6. Station coordinates used.
DOMES # Name X Y Z Epoch Dur +- X +- Y +- Z Vx Vy Vz
(m) (m) (m) MJD days (m) (m) (m) (m/yr) (m/yr) (m/yr)
X13407S011 DS60 (?) 4849202.502 -360329.180 4114912.961 48808.5 25.0 0.004 0.002 0.004 -0.0101 0.0185 0.0135
X????? MASPollom 5439189.142 -1522054.840 2953464.085 48808.5 5.0 0.008 0.004 0.006 -0.0040 0.0185 0.0169
X40701 SANTogue 1769692.989 -5044573.785 -3468321.402 48808.5 26.0 0.010 0.011 0.007 0.0013 -0.0044 0.0071
X40104M002 ALGO 918129.628 -4346071.218 4561977.781 48808.5 28.0 0.002 0.003 0.003 -0.0193 -0.0029 0.0012
X40127M003 YELL -1224452.371 -2689216.059 5633638.271 48808.5 29.0 0.002 0.002 0.003 -0.0231 -0.0029 -0.0064
X40407M00? PIN1 PEQ -2369510.372 -4761207.146 3511396.058 48808.5 7.0 0.003 0.005 0.004 -0.0224 0.0218 -0.0004
X40407M002 PIN1 -2369510.392 -4761207.164 3511396.033 48808.5 22.0 0.003 0.003 0.004 -0.0224 0.0218 -0.0004
X40405S0?? DS10 PEQ -2353614.083 -4641385.355 3676976.402 48808.5 4.0 0.004 0.006 0.005 -0.0159 0.0069 -0.0081
X40405S026 DS10 (?) -2353614.078 -4641385.364 3676976.426 48808.5 21.0 0.003 0.004 0.004 -0.0159 0.0069 -0.0081
X40460M001 SIO1 -2455521.684 -4767213.382 3441654.860 48808.5 12.0 0.003 0.005 0.004 -0.0335 0.0302 0.0180
X40460 SIO2 -2455539.233 -4767224.071 3441628.818 48808.5 23.0 0.003 0.004 0.004 -0.0335 0.0302 0.0180
X40400M005 JPL1 -2493304.063 -4655215.510 3565497.280 48808.5 22.0 0.003 0.004 0.004 -0.0372 0.0153 0.0120
X40400M00? JPL1 PEQ -2493304.072 -4655215.488 3565497.266 48808.5 7.0 0.003 0.005 0.004 -0.0372 0.0153 0.0120
X40105S004 DRAO (?) -2059164.593 -3621108.342 4814432.375 48808.5 29.0 0.002 0.002 0.003 -0.0201 -0.0023 -0.0103
X40408M001 FAIR -2281621.313 -1453595.746 5756961.963 48808.5 29.0 0.002 0.002 0.004 -0.0233 -0.0027 -0.0099
X92201M002 PAMA (?) -5245195.144 -3080472.123 -1912825.685 48808.5 5.0 0.013 0.012 0.007 -0.0416 0.0527 0.0293
X40424M004 KOKR -5543838.047 -2054587.474 2387809.481 48808.5 22.0 0.005 0.003 0.006 -0.0100 0.0613 0.0294
X?????S??? MCMU (?) -1310696.417 310469.332 -6213368.516 48808.5 26.0 0.013 0.012 0.007 0.0091 -0.0107 -0.0024
X50103S DS42 (?) -4460996.153 2682557.281 -3674444.134 48808.5 24.0 0.011 0.010 0.008 -0.0363 0.0023 0.0458
X21729S001 USUD -3855262.621 3427432.238 3741020.938 48808.5 20.0 0.006 0.004 0.008 -0.0212 -0.0097 -0.0130
X23902S001 TAIW -3024781.850 4928936.970 2681234.492 48808.5 27.0 0.007 0.008 0.009 -0.0232 -0.0078 -0.0118
X50107M004 YAR1 -2389025.457 5043316.885 -3078531.092 48808.5 24.0 0.011 0.010 0.008 -0.0485 0.0107 0.0552
X30302M001 HART (?) 5084625.136 2670366.576 -2768494.246 48808.5 12.0 0.014 0.012 0.008 -0.0013 0.0241 0.0209
X10503 METS (?) 2892571.006 1311843.296 5512634.000 48808.5 14.0 0.003 0.002 0.004 -0.0192 0.0132 0.0070
X10302M003 TROM 2102940.434 721569.354 5958192.082 48808.5 29.0 0.002 0.002 0.004 -0.0186 0.0110 0.0052
X12734 MATE new 4641949.794 1393045.251 4133287.214 48808.5 26.0 0.004 0.002 0.005 -0.0157 0.0179 0.0117
X14201 WTZ1 1200 4075578.649 931852.641 4801569.953 48808.5 26.0 0.004 0.002 0.004 -0.0161 0.0165 0.0105
X10402M004 ONSA 3370658.736 711876.990 5349786.800 48808.5 29.0 0.003 0.001 0.004 -0.0168 0.0147 0.0086
X10317M001 NALL 1202431.359 252626.760 6237770.778 48808.5 29.0 0.002 0.002 0.004 -0.0178 0.0083 0.0031
X13504M003 KOSG (?) 3899225.316 396731.763 5015078.257 48808.5 21.0 0.003 0.002 0.004 -0.0150 0.0161 0.0104
NOTES:
(a) Those sites without a DOMES point number are at unknown locations,
and those sites with a (?) in the Alternate descriptions possibly have
an incorrect DOMES number.
(b) The epoch refers to the epoch at which the site position applies
and not the mid-point of the data span. We have also added the
velocities adopted for these sites at the end of each line. For most sites
these are the NUVEL-1 velocities with the North American AM0-2 velocity
added. For PIN1 and DS10, Observed velocities (based on a combined VLBI/
GPS solution using ~10 years of data have been used).
(c) The PE notation in the site name (PINB, DS1B and JPLB) denotes
post-Landers earthquake position (applicable after 11:58 UTC June 28, 1992.
(d) These coordinates were estimated from the first 29 days of IGS data.
They have been rotated and translated into the ITRF 1990 frame by use
of the horizontal coordinates at YELL_GPS, PIN1_GPS, SIO1_GPS, FAIR_GPS,
USUD_GPS, DS10_GPS, DS60_GPS, YAR1_GPS, ONSA_GPS, WTZ1_GPS, TROM_GPS,
KOSG_GPS. The rms difference between the horizontal coordinates of
these sites and our previous realization (first IERS submission) was
15 mm).
6. Solution 920714
* MIT_TO_IERS: Run on 1992/ 7/17 17:15
* Input file : pmu920717.mit
48779.5 -0.15531 0.31885 -0.517136 0.00019 0.00020 0.000000 1.93 0.001 0.000 0.000 21 17 0
48780.5 -0.15624 0.32115 -0.519883 0.00021 0.00021 0.000000 1.84 0.109 0.000 0.000 21 16 0
48781.5 -0.15368 0.32302 -0.522617 0.00027 0.00025 0.000000 1.32 0.046 0.000 0.000 21 17 0
48782.5 -0.15451 0.32460 -0.525143 0.00026 0.00023 0.000000 1.32 0.117 0.000 0.000 21 17 0
48783.5 -0.15472 0.32779 -0.527309 0.00020 0.00020 0.000000 1.80 -0.010 0.000 0.000 21 17 0
48784.5 -0.15513 0.33001 -0.529055 0.00027 0.00024 0.000000 1.50 0.080 0.000 0.000 22 17 0
48785.5 -0.15373 0.33206 -0.530225 0.00023 0.00022 0.000000 1.42 0.000 0.000 0.000 22 17 0
48786.5 -0.15389 0.33508 -0.531264 0.00023 0.00022 0.000000 1.64 -0.023 0.000 0.000 21 17 0
48787.5 -0.15227 0.33830 -0.532088 0.00037 0.00033 0.000000 1.63 -0.062 0.000 0.000 17 17 0
48788.5 -0.15213 0.34141 -0.532830 0.00020 0.00022 0.000000 1.59 -0.011 0.000 0.000 21 17 0
48789.5 -0.15235 0.34447 -0.533614 0.00024 0.00025 0.000000 1.36 -0.040 0.000 0.000 20 17 0
48790.5 -0.15193 0.34715 -0.534539 0.00025 0.00025 0.000000 1.64 -0.044 0.000 0.000 21 17 0
48791.5 -0.15280 0.35032 -0.535654 0.00023 0.00024 0.000000 1.79 0.109 0.000 0.000 20 17 0
48792.5 -0.15191 0.35305 -0.536981 0.00020 0.00019 0.000000 2.22 0.060 0.000 0.000 20 17 0
48793.5 -0.15268 0.35566 -0.539967 0.00018 0.00019 0.000000 1.54 0.011 0.000 0.000 20 17 0
48794.5 -0.15108 0.35789 -0.541918 0.00021 0.00021 0.000000 1.35 0.000 0.000 0.000 23 17 0
48795.5 -0.15072 0.35924 -0.543939 0.00019 0.00020 0.000000 1.81 0.023 0.000 0.000 24 17 0
48796.5 -0.15012 0.36213 -0.545936 0.00017 0.00018 0.000000 1.50 0.098 0.000 0.000 24 17 0
48797.5 -0.14935 0.36385 -0.547805 0.00020 0.00023 0.000000 1.87 0.062 0.000 0.000 23 17 0
48798.5 -0.14714 0.36625 -0.549454 0.00026 0.00025 0.000000 1.36 0.121 0.000 0.000 21 17 0
48799.5 -0.14706 0.36930 -0.551219 0.00027 0.00028 0.000000 1.25 0.146 0.000 0.000 21 17 0
48800.5 -0.14466 0.37204 -0.552509 0.00024 0.00024 0.000000 1.30 0.085 0.000 0.000 22 17 0
48802.5 -0.14321 0.37720 -0.554140 0.00024 0.00027 0.000000 1.25 0.158 0.000 0.000 22 17 0
48803.5 -0.14155 0.38038 -0.555153 0.00020 0.00025 0.000000 1.89 0.119 0.000 0.000 21 17 0
48804.5 -0.14115 0.38151 0.443530 0.00016 0.00017 0.000000 2.21 0.129 0.000 0.000 23 17 0
48805.5 -0.13910 0.38475 0.441782 0.00018 0.00021 0.000000 1.98 0.083 0.000 0.000 22 17 0
48806.5 -0.13795 0.38644 0.439604 0.00020 0.00023 0.000000 1.58 0.133 0.000 0.000 22 17 0
48807.5 -0.13692 0.38956 0.437134 0.00021 0.00024 0.000000 1.72 0.096 0.000 0.000 23 16 0
48808.5 -0.13486 0.39141 0.434606 0.00018 0.00020 0.000000 1.62 0.038 0.000 0.000 24 16 0
48809.5 -0.13434 0.39332 0.432253 0.00015 0.00017 0.000000 2.95 0.134 0.000 0.000 26 16 0
48810.5 -0.13191 0.39555 0.430247 0.00017 0.00018 0.000000 3.01 0.057 0.000 0.000 27 16 0
48811.5 -0.13042 0.39820 0.428660 0.00014 0.00016 0.000000 2.63 0.095 0.000 0.000 27 17 0
48812.5 -0.12983 0.39940 0.427483 0.00015 0.00018 0.000000 2.82 0.142 0.000 0.000 26 17 0
48813.5 -0.12726 0.39815 0.427699 0.00019 0.00024 0.000000 6.56 0.290 0.000 0.000 27 16 0
48814.5 -0.12639 0.40500 0.427271 0.00014 0.00016 0.000000 3.01 0.192 0.000 0.000 28 17 0
NOTES: UT1 not estimated. Value given is apriori used in analysis. The rms is the square of chi**2
per degree of freedom in our solution. It nominally should be 1.0. st and sv are numbers of stations
and satellites in solution.
==============================================================================
>From: Bob E. Schutz
Subject: UTX SOLUTIONS
-------------
Earth Orientation Results Submitted to IERS
EARTH ROTATION PARAMETERS
ANALYSIS CENTER: UNIVERSITY OF TEXAS CENTER FOR SPACE RESEARCH
DATA: GPS
SOLUTION IDENTIFIER: EOP(CSR) 92 P 01
SUBMISSION DATE: 16 JULY 1992
MJD x y UT1 sx sy sUT1 RMS cxy cxUT1 cyUT1 Sta Sat Passes
48794.5 -0.15206 0.35361 0.0 0.00034 0.00038 0.0 2.1 0.0 0.0 0.0 16 17 275
48795.5 -0.15130 0.35812 0.0 0.00032 0.00035 0.0 2.1 0.0 0.0 0.0 16 17 275
48796.5 -0.14994 0.36261 0.0 0.00020 0.00024 0.0 1.7 0.0 0.0 0.0 17 17 308
48797.5 -0.14854 0.36192 0.0 0.00028 0.00041 0.0 1.9 0.0 0.0 0.0 17 17 249
48798.5 -0.14854 0.36618 0.0 0.00038 0.00046 0.0 1.4 0.0 0.0 0.0 15 17 247
48799.5 -0.14708 0.36858 0.0 0.00034 0.00034 0.0 1.7 0.0 0.0 0.0 17 17 282
48800.5 -0.14507 0.37326 0.0 0.00031 0.00033 0.0 1.4 0.0 0.0 0.0 14 17 286
48801.5 -0.14509 0.37373 0.0 0.00031 0.00030 0.0 1.4 0.0 0.0 0.0 19 17 350
48802.5 -0.14465 0.37779 0.0 0.00024 0.00026 0.0 1.5 0.0 0.0 0.0 19 17 371
48803.5 -0.14158 0.38167 0.0 0.00017 0.00017 0.0 1.9 0.0 0.0 0.0 19 17 398
48804.5 -0.14168 0.38466 0.0 0.00016 0.00017 0.0 1.9 0.0 0.0 0.0 19 17 382
48805.5 -0.14409 0.38765 0.0 0.00016 0.00017 0.0 2.1 0.0 0.0 0.0 20 17 392
48806.5 -0.13850 0.38859 0.0 0.00018 0.00020 0.0 2.2 0.0 0.0 0.0 19 17 392
48807.5 -0.13451 0.38798 0.0 0.00018 0.00024 0.0 2.3 0.0 0.0 0.0 18 17 350
48808.5 -0.13579 0.39443 0.000000 0.00019 0.00027 0.000000 1.53 -0.090 0.000 0.000 20 16 331
48809.5 -0.13384 0.39514 0.000000 0.00017 0.00017 0.000000 1.73 0.016 0.000 0.000 20 16 383
48810.5 -0.13257 0.39760 0.000000 0.00021 0.00022 0.000000 1.75 0.069 0.000 0.000 20 16 339
48811.5 -0.13019 0.39898 0.000000 0.00015 0.00014 0.000000 1.92 0.102 0.000 0.000 20 17 412
Notes:
1. RMS is in cm
2. MJD 48809.5 through 48810.5 excluded PRN12 based on the RMS which exceeded 2.3 cm.
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