Subject: [IGSMAIL-64] CDDIS GPS Data Holdings for IGS Week 7/GPS Week 0655
From: Carey Noll
Date: 12 AUG 1992 09:15:52

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IGS Electronic Mail       12-AUG-1992 09:15:52       Message Number 64
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                   THIS FILE CONTAINS 4 MESSAGES
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From:     Carey Noll
Subject:  CDDIS GPS Data Holdings for IGS Week 7/GPS Week 0655
          ----------------------------------------------------
                                                                                
              Current IGS GPS Data Holdings (as of 07-Aug-92 01:08)             
    IGS Week 7/GPS Week 655 (July 26 thru August 1, 1992; Days 208 thru 214)    
                                                                                
                                     2    2    2    2    2    2    2            
                    Mon.             0    0    1    1    1    1    1    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 
Brasilia            BRAS  TRIMBLE    X    X    X    X    X    X    X       7    
Darwin              DARW  ASHTECH    X    -    -    -    -    -    -       1    
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    
Herstmonceux        HERS  ROGUE      X    X    X    X    X    X    X       7    
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              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    
Mojave              MOJ1  MINIMAC    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    
Parana              PARA  TRIMBLE    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         PINY  ROGUE      X    X    X    X    X    X    X       7    
Richmond            RCM2  ROGUE      X    X    X    X    X    X    X       7    
Richmond            RCMA  MINIMAC    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    X       7    
Sao Paulo           UEPP  TRIMBLE    X    X    X    X    X    X    X       7    
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    X       7    
Usuda               USUD  ROGUE      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       6    
Yaragadee           YAR1  ROGUE      X    X    X    X    X    X    X       7    
Yellowknife         YELL  ROGUE      X    X    X    X    X    X    X       7    
Zimmerwald          ZIMA  ASHTECH    -    -    X    X    X    X    X       5    
Zimmerwald          ZIMM  TRIMBLE    X    X    X    X    X    X    X       7    
------------------  ----  --------  ---  ---  ---  ---  ---  ---  ---  -----    
Totals:               43 stations    42   41   42   41   41   41   41    289    

Notes:  CDDIS disk archive status:  

           GPS1:[GPSDATA] directory contains days 206 and on
           GPS2:[GPSDATA] directory contains days 187 thru 205
           GPS3:[PRODUCTS] directory contains IGS products

        RCMA data no longer submitted to the CDDIS as of day 212; data still 
           available from CIGNET Information Center, however.  Please advise
           CDDIS if we should continue to archive the RCMA data as well as the
           RCM2 (Rogue) data.

        An Ashtech receiver is operating at Zimmerwald; ZIMA data available in
           CDDIS since day 210.

        The Instituto Nacional de Pesquisas Espaciais (INPE) in Brazil is 
           sending data from three sites in Brazil:  BRAS (Brasilia), PARA 
           (Curitiba, Parana), and UEPP (Presidente Prudente, Sao Paulo).
           Data available from day 208 for Epoch '92 support.

        IfAG is now serving as the IGS European regional center and sending
           data from European sites to the CDDIS.  Included recently are data
           from Bar Giyorra (BARG), starting with day 215.

==============================================================================

From:     Yehuda Bock
Subject:  SIO Analysis Center Results (7 August, 1992)
          --------------------------------------------

SIO Analysis Center Results (7 August, 1992)

Yehuda Bock, Peng Fang and Keith Stark

This week we include the following information:

(1) Update on availability of SIO orbits
(2) SIO computed cCoseismic displacements at California sites due to
    Landers/Big Bear earthquakes (28 June 1992)
(3) Updated coordinates from the first 51 days of IGS analysis
    Polar motion results for 25-31 July.

(1) Availability of SIO orbits

The analysis center at SIO has been archiving GPS orbits since
14 August 1991, and maintaining them on-line for access via
anonymous ftp. To access the Scripps PGGA/GARNER archive:

Use anonymous ftp
address:      teddy.ucsd.edu (132.239.13.4)
Login:        anonymous
Password:     your name

Precise GPS orbits can be found under garner_orbits and are
stored by year (e.g. 92data).
The orbits are in NGS Precise Ephemeris Format (Standard Product 1).
The naming convention differs from the IGS one and is as follows:

ngarnyy.ddd (e.g. ngarn92.150)

This week we have renamed all our orbit files according to
the IGS convention. They can be found in igs_products/gps_week
The orbits can also be accessed according to our old naming
convention described above.
In addition, we have copied all orbit files since GPS week 649 to CDDIS.
They can be found in gps3:[products.week] (e.g. gps3:[products.0649].
We also plan to archive the IGS products of the other analysis centers,
under igs_products/gps_week

(2) Coseismic displacements

We have analyzed absolute coseismic displacements of the PGGA and
DSN sites in California from our daily SIO IGS solutions. The
displacements are computed from three weeks of solutions prior to
the earthquake, the day of the earthquake split into pre- and post-
earthquake solutions, and three weeks after the earthquake. These
displacements are from a fully rigorous global solution that
incorporates the SIO polar motion estimates over this period.

    Site            North            East             Up        
  post-pre           (mm)            (mm)            (mm)

  PINB-PIN1      43.4 +- 1.2      15.4 +- 2.4      -9.4 +- 5.6
  JPLB-JPL1       3.6 +- 1.5     -11.0 +- 2.3     -25.9 +- 5.5
  DS1B-DS10     -15.9 +- 1.4      -3.2 +- 2.4     -21.0 +- 6.7
  SIOC-SIO2      11.7 +- 1.6      10.3 +- 3.0     -20.1 +- 6.9

The formal errors should be scaled by a factor of 2 in order to
obtain realistic one-sigma estimates, according to the fit to
the adjustment of all the data. In addition, the scaled numbers agree
well with baseline repeatability over the three week period
before the earthquake and the three week period after the
earthquake. The horizontal displacements closely agree in
direction with those predicted by a variable-slip dislocation model,
while the magnitude of the observed displacements is uniformly about
70% of the model displacements. We do not consider the vertical motion
to be significant because of the higher scatter in our vertical
determinations. The hypothesis of no vertical motion should
be preferred.

(3) Updated coordinates and polar motion results.

    The new set of coordinates described below is based on the 
    analysis of the of the first 51 days of the IGS campaign, and
    include a new set of coordinates after the Landers earthquake.
    The polar motion results are for the period 25-31 July.

1. Analysis Center: Scripps Institute of Oceanography
2. Solution Identifier: Submission 920807
3. Software used: GAMIT/GLOBK
4. Definition of Terrestrial Reference Frame:
     Origin: Nominally ITRF-90
     Orientation: Nominally ITRF-90
     Reference epoch: 1992.57  (MJD 48829.5)
     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).
   (g) On MJD 48800.5, the California sites are treated as separate
sites before and after the Landers earthquake.

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)
X10302M003 Tromsoe    2102940.447   721569.360  5958192.092 48829.5    51.0      0.002  0.002  0.003 -0.0186  0.0110  0.0052 
X10317M001 NALL       1202431.371   252626.765  6237770.782 48829.5    49.0      0.002  0.002  0.003 -0.0178  0.0083  0.0031 
X10402M004 ONSA       3370658.746   711876.997  5349786.805 48829.5    50.0      0.002  0.002  0.003 -0.0168  0.0147  0.0086 
X10503S011 METS       2892571.016  1311843.303  5512634.005 48829.5    36.0      0.002  0.002  0.003 -0.0192  0.0132  0.0070 
X11001M002 Graz       4194424.048  1162702.525  4647245.239 48829.5    12.0      0.003  0.002  0.003 -0.0164  0.0168  0.0106 
X12734M008 MATE new   4641949.803  1393045.257  4133287.221 48829.5    49.0      0.002  0.002  0.003 -0.0157  0.0179  0.0117 
X13212M007 Herstmon   4033470.295    23672.714  4924301.128 48829.5    46.0      0.005  0.003  0.005 -0.0135  0.0165  0.0110 
X13407S012 Madrid     4849202.507  -360329.166  4114912.958 48829.5    40.0      0.003  0.002  0.003 -0.0101  0.0185  0.0135 
X13504M003 Kootwijk   3899225.329   396731.773  5015078.266 48829.5    43.0      0.002  0.002  0.003 -0.0150  0.0161  0.0104 
X14201S020 Wettzell   4075578.658   931852.651  4801569.960 48829.5    48.0      0.002  0.002  0.003 -0.0161  0.0165  0.0105 
X21729S003 Usuda     -3855262.632  3427432.244  3741020.958 48829.5    27.0      0.004  0.004  0.005 -0.0212 -0.0097 -0.0130 
X23902M001 Taipei    -3024781.855  4928936.973  2681234.516 48829.5    46.0      0.005  0.005  0.005 -0.0232 -0.0078 -0.0118 
X30302M002 HART       5084625.120  2670366.540 -2768494.199 48829.5    32.0      0.008  0.007  0.004 -0.0013  0.0241  0.0209 
X31303M001 MASPollom  5439189.154 -1522054.819  2953464.086 48829.5    26.0      0.003  0.002  0.003 -0.0040  0.0185  0.0169 
X40101M001 St. John   2612631.381 -3426807.002  4686757.711 48829.5    17.0      0.003  0.002  0.003 -0.0195 -0.0033  0.0084 
X40104M002 ALGO        918129.627 -4346071.211  4561977.762 48829.5    49.0      0.002  0.002  0.002 -0.0193 -0.0029  0.0012 
X40105M002 Penticon  -2059164.597 -3621108.342  4814432.369 48829.5    51.0      0.002  0.002  0.002 -0.0201 -0.0023 -0.0103 
X40127M003 YELL      -1224452.373 -2689216.062  5633638.275 48829.5    51.0      0.002  0.002  0.002 -0.0231 -0.0029 -0.0064 
X40400M006 JPL1      -2493304.076 -4655215.507  3565497.271 48829.5    23.0      0.002  0.003  0.003 -0.0372  0.0153  0.0120 
X40400M00? JPL1 PEQ  -2493304.072 -4655215.483  3565497.259 48829.5    28.0      0.002  0.003  0.003 -0.0372  0.0153  0.0120 
X40405S028 Golstone  -2353614.088 -4641385.363  3676976.416 48829.5    22.0      0.002  0.003  0.003 -0.0159  0.0069 -0.0081 
X40405S0?? Gold PEQ  -2353614.092 -4641385.353  3676976.394 48829.5    21.0      0.002  0.003  0.003 -0.0159  0.0069 -0.0081 
X40407M002 PIN1      -2369510.404 -4761207.161  3511396.023 48829.5    23.0      0.002  0.003  0.002 -0.0224  0.0218 -0.0004 
X40407M00? PIN1 PEQ  -2369510.373 -4761207.140  3511396.054 48829.5    29.0      0.002  0.003  0.002 -0.0224  0.0218 -0.0004 
X40408M001 Fairbanks -2281621.313 -1453595.741  5756961.965 48829.5    19.0      0.002  0.002  0.003 -0.0233 -0.0027 -0.0099 
X40424M004 Kokee Pk. -5543838.053 -2054587.456  2387809.481 48829.5    43.0      0.003  0.002  0.003 -0.0100  0.0613  0.0294 
X40460     SIO2      -2455539.248 -4767224.071  3441628.810 48829.5    17.0      0.002  0.004  0.003 -0.0335  0.0302  0.0180 
X40460     SIO2 PEQ  -2455539.226 -4767224.054  3441628.808 48829.5    21.0      0.002  0.003  0.003 -0.0335  0.0302  0.0180 
X40460M001 SIO1      -2455521.697 -4767213.379  3441654.850 48829.5    12.0      0.004  0.003  0.003 -0.0335  0.0302  0.0180 
X41705M002 SANTogue   1769692.988 -5044573.802 -3468321.387 48829.5    48.0      0.006  0.007  0.004  0.0013 -0.0044  0.0071 
X50103S    DS42 (?)  -4460996.139  2682557.264 -3674444.110 48829.5    39.0      0.006  0.006  0.005 -0.0363  0.0023  0.0458 
X50107M004 Yarragad. -2389025.452  5043316.874 -3078531.064 48829.5    46.0      0.006  0.006  0.005 -0.0485  0.0107  0.0552 
X66001S005 Mc Murdo  -1310696.393   310469.318 -6213368.515 48829.5    43.0      0.007  0.007  0.005  0.0091 -0.0107 -0.0024 
X92201M002 Pamatai   -5245195.149 -3080472.127 -1912825.677 48829.5    20.0      0.006  0.006  0.004 -0.0416  0.0527  0.0293 
X?????M??? Darwin    -4091358.542  4684606.625 -1408580.749 48829.5    11.0      0.007  0.006  0.005 -0.0376 -0.0146  0.0609 
X?????M??? Vandbrg   -2678089.800 -4525437.755  3597431.423 48829.5    15.0      0.002  0.003  0.003 -0.0302  0.0327  0.0187 
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 PEQ notation in the site name (PINB, DS1B, SIOC and JPLB) denotes 
post-Landers earthquake position (applicable after 11:58 UTC June 28, 1992.
 (d) These coordinates were estimated from the first 51 days of IGS data.
They have been rotated and translated into the ITRF 1990 frame by use
of the horizontal coordinates at all sites.  The rms difference between 
the horizontal coordinates of these sites and our previous realization 
(second IERS submission) was 5 mm).
 (e) The outlier in our polar motion result for day 192 (10 July) has
been resolved and the current table reflects this.

6. Solution 920807

* MIT_TO_IERS: Run at SIO on 1992/ 8/ 7 15:54
* Input file : pmu920807.mit
 48780.5  -0.15613  0.32205 -0.519883  0.00021 0.00021 0.000000 1.96  0.109  0.000  0.000   21  16 0
 48781.5  -0.15372  0.32385 -0.522617  0.00027 0.00025 0.000000 1.46  0.046  0.000  0.000   21  17 0
 48782.5  -0.15455  0.32543 -0.525143  0.00026 0.00023 0.000000 1.29  0.117  0.000  0.000   21  17 0
 48783.5  -0.15467  0.32866 -0.527309  0.00020 0.00020 0.000000 1.81 -0.010  0.000  0.000   21  17 0
 48784.5  -0.15518  0.33080 -0.529055  0.00027 0.00024 0.000000 1.41  0.080  0.000  0.000   22  17 0
 48785.5  -0.15367  0.33296 -0.530225  0.00023 0.00022 0.000000 1.43  0.000  0.000  0.000   22  17 0
 48786.5  -0.15379  0.33598 -0.531264  0.00023 0.00022 0.000000 1.71 -0.024  0.000  0.000   21  17 0
 48787.5  -0.15227  0.33915 -0.532088  0.00037 0.00033 0.000000 1.61 -0.062  0.000  0.000   17  17 0
 48788.5  -0.15204  0.34224 -0.532830  0.00020 0.00022 0.000000 1.49 -0.011  0.000  0.000   21  17 0
 48789.5  -0.15227  0.34537 -0.533614  0.00024 0.00025 0.000000 1.36 -0.040  0.000  0.000   20  17 0
 48790.5  -0.15178  0.34806 -0.534539  0.00025 0.00025 0.000000 1.74 -0.044  0.000  0.000   21  17 0
 48791.5  -0.15268  0.35123 -0.535654  0.00023 0.00024 0.000000 1.81  0.109  0.000  0.000   20  17 0
 48792.5  -0.15185  0.35393 -0.536981  0.00020 0.00019 0.000000 2.28  0.060  0.000  0.000   20  17 0
 48793.5  -0.15265  0.35656 -0.539967  0.00018 0.00019 0.000000 1.59  0.011  0.000  0.000   20  17 0
 48794.5  -0.15107  0.35867 -0.541918  0.00021 0.00021 0.000000 1.37  0.000  0.000  0.000   23  17 0
 48795.5  -0.15069  0.36003 -0.543939  0.00019 0.00020 0.000000 1.93  0.023  0.000  0.000   24  17 0
 48796.5  -0.15002  0.36293 -0.545936  0.00017 0.00018 0.000000 1.61  0.099  0.000  0.000   24  17 0
 48797.5  -0.14923  0.36463 -0.547805  0.00020 0.00023 0.000000 1.90  0.062  0.000  0.000   23  17 0
 48798.5  -0.14700  0.36705 -0.549454  0.00026 0.00025 0.000000 1.40  0.121  0.000  0.000   21  17 0
 48799.5  -0.14700  0.37016 -0.551219  0.00027 0.00028 0.000000 1.34  0.146  0.000  0.000   21  17 0
 48800.5  -0.14457  0.37288 -0.552509  0.00024 0.00024 0.000000 1.34  0.085  0.000  0.000   22  17 0
 48801.5  -0.14404  0.37427 -0.553393  0.00027 0.00028 0.000000 1.18  0.161  0.000  0.000   26  17 0
 48802.5  -0.14297  0.37794 -0.554140  0.00024 0.00027 0.000000 1.40  0.158  0.000  0.000   22  17 0
 48803.5  -0.14154  0.38093 -0.555153  0.00020 0.00025 0.000000 1.89  0.119  0.000  0.000   21  17 0
 48804.5  -0.14111  0.38215  0.443530  0.00016 0.00017 0.000000 2.22  0.129  0.000  0.000   23  17 0
 48805.5  -0.13907  0.38531  0.441782  0.00018 0.00021 0.000000 1.98  0.083  0.000  0.000   22  17 0
 48806.5  -0.13790  0.38707  0.439604  0.00020 0.00023 0.000000 1.53  0.133  0.000  0.000   22  17 0
 48807.5  -0.13686  0.39027  0.437134  0.00021 0.00024 0.000000 1.76  0.096  0.000  0.000   23  16 0
 48808.5  -0.13477  0.39214  0.434606  0.00018 0.00020 0.000000 1.80  0.038  0.000  0.000   24  16 0
 48809.5  -0.13430  0.39393  0.432253  0.00015 0.00017 0.000000 1.30  0.135  0.000  0.000   26  16 0
 48810.5  -0.13189  0.39617  0.430247  0.00017 0.00018 0.000000 1.44  0.057  0.000  0.000   27  16 0
 48811.5  -0.13039  0.39882  0.428660  0.00014 0.00016 0.000000 1.52  0.095  0.000  0.000   27  17 0
 48812.5  -0.12982  0.39996  0.427483  0.00015 0.00018 0.000000 1.84  0.142  0.000  0.000   26  17 0
 48813.5  -0.12806  0.40230  0.427699  0.00021 0.00025 0.000000 2.91  0.277  0.000  0.000   26  16 0
 48814.5  -0.12640  0.40553  0.427271  0.00014 0.00016 0.000000 1.48  0.192  0.000  0.000   28  17 0
 48815.5  -0.12614  0.40898  0.426947  0.00015 0.00020 0.000000 1.57  0.185  0.000  0.000   27  17 0
 48816.5  -0.12504  0.41105  0.426598  0.00014 0.00016 0.000000 1.89  0.164  0.000  0.000   29  17 0
 48817.5  -0.12520  0.41152  0.426111  0.00017 0.00020 0.000000 1.81  0.162  0.000  0.000   28  17 0
 48818.5  -0.12414  0.41383  0.425416  0.00016 0.00017 0.000000 1.74  0.106  0.000  0.000   27  17 0
 48819.5  -0.12285  0.41555  0.424472  0.00017 0.00019 0.000000 1.88  0.113  0.000  0.000   25  17 0
 48820.5  -0.12000  0.41761  0.423296  0.00020 0.00020 0.000000 1.88  0.166  0.000  0.000   24  17 0
 48821.5  -0.11824  0.41878  0.421397  0.00027 0.00028 0.000000 1.96  0.159  0.000  0.000   23  17 0
 48822.5  -0.11542  0.42145  0.419817  0.00021 0.00020 0.000000 1.95  0.137  0.000  0.000   25  17 0
 48823.5  -0.11306  0.42399  0.418199  0.00024 0.00025 0.000000 2.10  0.073  0.000  0.000   24  17 0
 48824.5  -0.10958  0.42682  0.416635  0.00017 0.00019 0.000000 1.95  0.100  0.000  0.000   25  18 0
 48826.5  -0.10646  0.43135  0.414004  0.00013 0.00014 0.000000 1.89  0.062  0.000  0.000   29  18 0
 48827.5  -0.10441  0.43306  0.413023  0.00014 0.00014 0.000000 1.75  0.082  0.000  0.000   27  18 0
 48828.5  -0.10140  0.43504  0.411183  0.00016 0.00017 0.000000 1.73  0.019  0.000  0.000   25  18 0
 48829.5  -0.09985  0.43682  0.410301  0.00016 0.00017 0.000000 1.46  0.045  0.000  0.000   25  18 0
 48830.5  -0.09737  0.43913  0.409336  0.00013 0.00014 0.000000 2.02  0.014  0.000  0.000   26  18 0
 48831.5  -0.09565  0.44142  0.408090  0.00014 0.00015 0.000000 2.03  0.026  0.000  0.000   27  18 0
 48832.5  -0.09406  0.44288  0.406405  0.00016 0.00018 0.000000 2.70  0.119  0.000  0.000   26  18 0
 48833.5  -0.09254  0.44531  0.404186  0.00018 0.00016 0.000000 1.94  0.215  0.000  0.000   26  18 0
 48834.5  -0.08947  0.44698  0.401566  0.00012 0.00013 0.000000 2.10  0.074  0.000  0.000   27  18 0
NOTES: UT1 not estimated.  Value given is apriori used in analysis.  The rms is the square root 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:     Dennis McCarthy
Subject:  Preliminary look at GPS Earth orientation
          -----------------------------------------

Date:     10 August 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  48794.5    35  -0.51 -2.51          1.19  2.14  
             -48828.5

Scripps      48780.5    54  -1.07 -1.66          0.75  0.82
             -48834.5     

U. of Berne  48792.5     8  -0.36  0.39  -1.50   1.82  1.87  0.14 
 (ITRF90)    -48799.5

U. of Berne  48800.5    29  -0.57 -0.16  -0.21   0.81  1.00  0.29 
 (ITRF91)    -48828.5

JPL          48794.5    35  -0.80 -1.24          0.79  1.60 
             -48828.5

GFZ          48795.0    27   1.98  2.64          1.41  1.86
             -48821.0

ESOC         48794.5    35  -1.40  1.36          1.39  2.37
             -48828.5

Plots are available by FAX to anyone interested.

Regards,

Dennis McCarthy
  [email-masked]

===============================================================================

From:     Dave Starr
Subject:  Anti Spoofing
          -------------

Last weekend, blockII satellites were operated with AS on (no p-code
available). Most Rogue sites handled the switchover just fine (taking
1.5-2.5 minutes to re-acquire satellites and produce tracking records).

A few sites had problems:
HERS (Hersmonceaux) did not track as many points as usual. Running
Meenix 7.0, but an older version? Also, the operators of HERS have
always used TRK format, which is not ideal. Do we have a contact for them?

GOLD (Goldstone)
MADR (Madrid) did not track AS. May have been upgraded this week. TIDB
tracked fine with newer software.

TAIW (Taiwan) did not track as many points as usual. Much older version
of software (5.6.1). Do we have a contact for them?

USUDA did not track AS. Older version of software (5.6.1).

Note that during the AS period, ephemerides were not available for
blockII satellites. The ephemerides are missing from the raw data
files, and Tom Meehan says that he noticed them missing for TurboRogue
also. Seems that the DOD did not broadcast them?