[IGSMAIL-130] Kokee Park Report
Tom
Tom
Fri Nov 6 17:36:29 PST 1992
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IGS Electronic Mail 6-NOV-1992 17:36:29 Message Number 130
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THIS FILE CONTAINS 4 MESSAGES
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^From: Tom Clark
Subject: Kokee Park Report
-----------------
I am informed by Clyde Cox, the VLBI manager for the Kokee Park, Hawaii
facility, that commercial, full-time power has been restored after a
nearly 2 month hiatus due to Hurricane Iniki hitting the island of Kauai
on Sept. 12th.
Tom Clark
==============================================================================
^From: Carey Noll/CDDIS
Subject: CDDIS GPS Data Holdings for IGS Week 20/GPS Week 0668
---------------------------------------------------------------
Current IGS GPS Data Holdings (as of 05-Nov-92 01:11)
IGS Week 20/GPS Week 0668 (October 25 thru 31, 1992; Days 299 thru 305)
2 3 3 3 3 3 3
Mon. 9 0 0 0 0 0 0 No.
Site Name Name Receiver 9 0 1 2 3 4 5 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 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 X X - - - 4
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 X 7
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 X 7
Metsahovi METS Rogue X X X X X X X 7
Ny Alesund NYAL Rogue X X X X X X - 6
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
Pinyon Flat PIN1 Ashtech X X X X X - - 5
Quincy QUIN Rogue X X - X X - - 4
Richmond RCM2 Rogue - X X X - - - 3
Saint John's STJO Rogue X X X X X X X 7
Santiago SANT Rogue X X X X X X - 6
Scripps SIO2 Ashtech X X X X - - - 4
Taiwan TAIW Rogue X X X X X X X 7
Tidbinbilla TIDB Rogue - X X X X X X 6
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 X 7
Usuda USUD Rogue X X X X X X X 7
Vandenberg VNDP Ashtech X X X X X X X 7
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 - - - - 2
------------------ ---- -------- --- --- --- --- --- --- --- -----
Totals: 39 stations 36 39 38 38 35 33 31 250
Notes: CDDIS disk archive status:
GPS1:[GPSDATA] directory contains days 281 thru 300
GPS2:[GPSDATA] directory contains days 301 and on
GPS3:[PRODUCTS] directory contains IGS products
GPS3:[IGSMAIL] directory contains IGS MAIL messages and index
CIGNET has discontinued operation of the Westford (WES1) receiver
as of day 307 due to poor data quality.
CDDIS has begun routinely retrieving PGGA data (SIO2, PIN1, VNDP) data
from Scripps. These data will be stored in the daily directories
starting with day 292.
JPL has resumed delivery of RCM2 (Richmond) and TIDBinbilla data as
of day 300.
==============================================================================
^From: Jan Kouba
Subject: EMR solution for week 0666
--------------------------
Jan Kouba
Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: kouba at geod.emr.ca
from: J. Kouba
Subject: Geodetic Survey Division (GSD), SMRSS, EMR analysis results
for the GPS weeks # 665,666 (Oct 04-Oct 17, 1992)
submitted by:
J. Kouba * , P. Tetreault, R. Ferland, F. Lahaye, M. Caissy, P. Heroux
Geodetic Survey Division (GSD), Surveys Mapping & Remote Sensing Sector
(SMRS), Energy Mines and Resources (EMR), 615 Booth Str., Ottawa, K1A 0E3
* on secondment to the Geodetic Survey from the Geophysics Div., Geological
Survey of Canada (GSC), EMR, 1 Observatory cresc., Ottawa, K1A 0Y3
Our analysis utilizes the JPL GIPSY/OASIS II (UNIX) software system
and data from all (up to 7) Canadian stations augmented by up to 12, globally
distributed, core stations (see Table 1 for the list of stations).
Starting with this submissions we have implemented:
- a new estimation strategy (see bellow)
- constraining additional stations at IGS coordinates (up to 11, see Table1)
- including 3 additional stations (HOLB, MCMU and PAMA).
The new estimation strategy includes an additional DUT1 unknown parameter,
estimated with respect to stochastically modeled (random walk of 1m/sqrt(1day))
satellite orbits, and initialized, once a week, at the a priori DUT1 (Bull. A)
values. Undifferenced phase and pseudorange observations are weighted according
to sigmas computed from the following exponential function:
sig0 + sig1*exp(-el/el0),
where el is the elevation angle (in deg); el0=20deg; sig0 and sig1 are set at
4 and 15mm (100 and 520mm) for undifferenced phase (pseudorange) observations
at most stations.
Submitted results start with GPS Week # 665 and include only days when
AS was not invoked. The EOP for the week #665 is resubmitted here to provide
the necessary overlap. The week #666 was also computed with the old strategy,
the average offsets (new-old) in x and y were: -1.2+-.4mas; -2.1+-.2mas.
CAUTION: The old EMR EOP series is labelled at noon each day (0.5 of MJD),
more correct labelling would have been at midnight (0.0) of each MJD as this was
the apriori used to reconstruct the total values. Strictly speaking, the EOP
solution corrections refer to noon (0.5) so that both apriori and corrections
at 0.5 MJD should have been used (and are now used for the new EMR EOP).
This effort is a part of a joint pilot project to test the
so called "Active Control System" in Canada and involves the Geodetic
Survey (GSD), SMRSS, the Geophysics Division and Pacific Geoscience Centre of
the Geological Survey of Canada, all three institutions are part of the
Department of Energy, Mines & Resources (EMR).
Table 1 : Station Summary (also indicated are day no. for which a
particular station is not included in the daily solution, either due to being
down or data being late)
station IGS code missing day no. of 1992
Albert Head, CAN ALBH
Algonquin, CAN ALGO*
Fairbanks FAIR*
Goldstone GOLD*
Hartebeesthoek HART*
Holberg,CAN HOLB
Kokee Park KOKB 278 -> 291
Madrid MADR* 280
McMurdo MCMU
Pamatai PAMA
Penticton, CAN DRAO
Prince Albert, CAN PRAL
Santiago SANT* 280
St. Johns, CAN STJO
Canbera TIDB*
Tromsoe TROM*
Wettzell WETT*
Yarragadee YAR1*
Yellowknife, CAN YELL*
* indicates constrained stations, remaining are solved for (50m apriori sig.)
SOLUTION CHARACTERISTICS
Reference frame and orientation
Nominally ITRF91 at epoch 1992.5, realized by constraining up to 11
above stations at the IGS coordinates (see IGS message #90):
Orientation is realized through the above coordinates and the fixed, once a
week, DUT1 values from the current NEOS/IERS (Bull. A).
Constants and models
- no change, see the IGS mess. #101 for details-
Estimation strategies
- no change, see the IGS mess. #101 for details - , except for the estimation
of DUT1, stochastic orbit modeling, new weighting of L3,P3 discussed above.
ALGO was used as time reference.
Table 3: Summary of estimated parameters and apriori weighting
(L3 and P3 undifferenced phase and smoothed pseudorange sigmas of 4/15mm
100/520mm were used with an exponential el. weighting; > 15 deg @ 5min)
parameter model apriori weighting (sigmas)
station X,Y,Z unknown parameters 50m (fixed stations .002-.02m)
pole x,y " " 3m
Dut1 " " 3m ; fixed/reset once a week
trop. zen. delay " " 0.2m
trop. bias random walk .01m/sqrt(1hour)
satellite states unknown parameters 1km; .005m/s or 1m; .0005m/s
rad. press Gx,Gz " " 10%
rad. press Gy " " 1.0 10e-9 m/s^2
initial real cy amb. " " 300000km
station clocks white noise 1s
satellite clocks " " 1ms and .1ms for Block I and II,resp.
Aposterioi variance factors typically are between 0.5 and 1.0 (noise
about 3mm and 200mm for phase and smoothed pseudorange observations, resp.).
Due to data quality for the AS days the results for the corresponding
days (with AS turned on) are not included here.
SUMMARY OF CANADIAN EMR SOLUTION
1. Analysis centre : Geodetic Survey Division (GSD), SMRSS , EMR
2. Solution identifier: Submission 921105
3. Software used : GIPSY/OASIS II (UNIX )
4. Definition of Terrestrial frame:
origin : Nominally ITRF91
orientation : " "
reference epoch : 1992.5
velocity of light : 299792458 m/s
GM : 389600.4414 km^3/s^5
gravity model : GEMT3( 8,8) +C21+S21
permanent tide corr: None
ocean loading : Pagiatakis, global model
5. Adjusted parameters:
undifferenced phase and smoothed pseudorange data > 15 degrees @ 5 min.
single day (24h) arc with 6 IC and 3 rad. parameters per satellite (19
satellites, PRN 27 included)
tropospheric zenith delay corr. parameter augmented with random walk stoch.
process
initial phase ambiguity parameters (one for each satellite station pass or
initial phase)
station positions X,Y,Z, up to 19 stations, ALGO, FAIR, GOLD, HART, SANT,
TROM, WETT, YELL, MADR, TIDB and YAR1 constrained.
x, y pole position once a day (DUT1 fixed/solved; DUT1,x,y apriori sigma=3m)
station clock biases once per each epoch/station (except for ALGO h. maser
which provides the time reference) with sigma 1 s
satellite clock biases once per each epoch/satellite with 1ms or .1ms sigma
Pole solution for non AS days
MJD date x(") y(") DUT1(s) xsig ysig utsig xyc
48899.5 10/04/92 AS on
48900.5 10/05/92 AS on
48901.5 10/06/92 .07174 .50298 .27496 .00026 .00022 0 0
48902.5 10/07/92 .07475 .50255 .27253 .00022 .00020 .00014 0
48903.5 10/08/92 .07819 .50173 .27005 .00023 .00020 .00020 0
48904.5 10/09/92 .08109 .50195 .26741 .00026 .00023 .00024 0
48905.5 10/10/92 AS on
48906.5 10/11/92 AS on
48907.5 10/12/92 AS on
48908.5 10/13/92 .09039 .49698 .25835 .00024 .00020 0 0
48909.5 10/14/92 .09289 .49686 .25620 .00022 .00019 .00014 0
48900.5 10/15/92 .09568 .49635 .25368 .00022 .00019 .00020 0
48911.5 10/16/92 .09741 .49548 .25127 .00022 .00020 .00024 0
48912.5 10/17/92 AS on
Products generated:
The following products are generated and uploaded into CDDIS @ NASA/GSFC
EMR06663.EPH GPS ephemeris for week#666/d3 in sp3 format (exl. prn26)
EMR06667.EPH GPS ephemeris for week # 666/d4-6 in sp3 format
EMR06667.ERP pole x y solutions for week# 665(resubmitted),666
EMR06667.SUM name of this text file
remarks on EMR's products:
1. only days with no AS included
2. ALGO hydrogen maser used as a time reference. In the sp3 EPH file sat.
epochs with no reference (e.g. ALGO not observing a satellite) have a value
of 99999. microseconds.
ALGO clock error was about -0.15microsec w.r.t. GPS time during this period.
3. ephemeris refers to the mass centre of SV
4. DUT1 var-covariance matrix is fully populated, consequence of a random walk
orbit model. i.e. cov(i,j)= var(i,i). Differences or LODRs are uncorrelated
with var= var(j,j)-var(i,i); j=i+1. DUT1 solutions may or may not be real,
they may reflect orbit (longitude) mismodeling common to all satellites.
5. prn26 exluded on Oct 13/92 due to orbit change
==============================================================================
^From: Ch. Reigber
Subject: Report for GPS Week 667 (Days 292-298) from GFZ
===============================================
This report is generated by the GeoForschungsZentrum Potsdam (GFZ)
on a weekly basis for the International GPS Geodynamics Service (IGS).
PRODUCT SUMMARY
GFZ0667*.EPH: GPS ephemerides for GPS Week 667 (SP3 format, pos. and vel.)
* represents: 2 for Tuesday, .... , 5 for Friday
GFZ06677.ERP: Earth rotation parameter (UT1 corrections are not included)
GFZ06677.CLK: ST and SV clock parameters of each observation epoch (the
maser-based clock at Fairbanks is taken as reference clock)
GFZ06677.SUM: Summary file for reporting week
The above specified products are available at CDDIS. The ERP results are
submitted additional to IERS Central Bureau and IERS Sub Bureau for Rapid
Service and Predictions.
*********************************************************************************
Note: Due to AS all product files do not include the days 292, 293
and 298.
*********************************************************************************
CORE STATION SUMMARY
The Core Station data used in the solutions is given below.
Day of Week 667
T W T F
U E H R
Site E D U I
Name Code
-------------------------------------------------
Algonquin ALGO X X X X
Fairbanks FAIR X X X X
Goldstone DS10 X X X X
Hartebeesthoek HART X X X X
Kokee Park KOKR - - - -
Mc Murdo MCMU X X X X
Ny-Alesund NALL X X X X
Pamatai PAMA X X X X
Santiago SANT X X X X
Tai Shi TAIW X X X X
Tidbinbilla TIDB - - - -
Tromsoe TROM X X X X
Usuda USUD X X X X
Wettzell WTZ1 X X X X
Yellowknife YELL X X X X
Yarragadee YAR1 X X X X
-------------------------------------------------
SOLUTION CHARACTERISTICS
1. Analysis Center: GFZ/DLR
2. Analysing Team: D. Angermann, R. Galas, Ch. Reigber, S.Y. Zhu
3. Solution Identifier: EPH(GFZ)92G01-DDD
ERP(GFZ)92G02-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.101)
ALGO, YELL, FAIR, KOKR, TROM, WTZ1, YAR1, PAMA,
MCMU, TAIW, DS10, SANT, HART, NALL,
6. Data used:
- undifferenced pseudo ranges and carrier phases
- 1-day arc solutions
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. 2 3 4 5
------------------------------------------------------
Observation Interval [sec] 360 360 360 360
Number of observations 22249 22100 22913 21117
RMS of carrier phases [cm] 0.6 0.6 0.6 0.6
RMS of code measurements [cm] 47.6 44.3 45.8 47.1
------------------------------------------------------
- GFZ06677.ERP
============
Solution identifier for ERP-Results:
* GPS week 650-653: ERP(GFZ)92G01-DDD
* since GPS week 654: ERP(GFZ)92G02-DDD
Please notice, that these two solutions are related to
different reference frames.
MJD x sigmax y sigmay
48915.5 0.1076 0.0003 0.4961 0.0003
48916.5 0.1085 0.0003 0.4950 0.0003
48917.5 0.1120 0.0003 0.4929 0.0003
48918.5 0.1147 0.0003 0.4919 0.0003
- GFZ06677.CLK
============
The clock parameter file is avaibable at CDDIS.
The format of this file is described in the
IGS Message No. 55.
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