Subject: [IGSMAIL-81] Request for list of FIDUCIAL stations
From: Peter Morgan
Date: 31 AUG 1992 17:06:32

***********************************************************************
IGS Electronic Mail       31-AUG-1992 17:06:32       Message Number 81
***********************************************************************
 
==============================================================================
                   THIS FILE CONTAINS 7 MESSAGES
==============================================================================

From:     Peter Morgan
Subject:  Request for list of FIDUCIAL stations
          -------------------------------------

Could I please have forwarded to me, a list of all stations
participating in the EPOCH'92 Campaign component.

I prefer to have the following information:

1. Station Name 
2. Country
3  4 character abreviation if appropriate
4  A-priori coordinates (please tell me what system)
5  Data Center where data will be lodged

Other information such as dates of observation, instrument type etc are
most welcome.

Regards  peter

[email-masked]

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

From:     Carey Noll
Subject:  CDDIS GPS Data Holdings for IGS Week 10/GPS Week 658
--------------------------------------------------------------

              Current IGS GPS Data Holdings (as of 27-Aug-92 07:08)             
      IGS Week 10/GPS Week 658 (August 16 thru 22, 1992; Days 229 thru 235)     
                                                                                
                                     2    2    2    2    2    2    2            
                    Mon.             2    3    3    3    3    3    3    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       6    
Graz                GRAZ  Rogue      X    X    X    X    X    X    X       7    
Graz                GRAA  Ashtech    -    X    X    X    X    X    X       6    
Hartebeesthoek      HART  Rogue      X    X    X    X    X    X    X       7    
Herstmonceux        HERS  Rogue      -    X    X    X    X    X    X       6    
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    
Kourou              KOUR  Rogue      X    X    X    -    -    -    -       3    
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    
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    -    -    -       4    
Richmond            RCM2  Rogue      X    X    X    -    -    X    X       5    
Saint John's        STJO  Rogue      X    X    X    X    X    X    X       7    
Santiago            SANT  Rogue      -    X    X    X    X    X    X       6    
Taiwan              TAIW  Rogue      X    X    X    X    X    X    X       7    
Tidbinbilla         TIDB  Rogue      X    X    X    X    X    X    X       7    
Townsville          TOWN  Trimble    X    X    X    X*   X*   X*   X*      7    
Tromso              TROM  Rogue      X    X    X    X    X    X    X       7    
Tsukuba             TSUK  Minimac    X    X    X    -    -    -    -       3    
Usuda               USUD  Rogue      X    X    X    X    X    X    X       7    
Victoria            PGC1  Rogue      -    -    -    -    -    X    -       1    
Wellington          WELL  Trimble    X    X    X    X*   X*   X*   X*      7
Westford            WES1  Minimac    X    X    X    X    X    X    X       7    
Wettzell            WETT  Rogue      X    X    X    X    X    X    -       6    
Yaragadee           YAR1  Rogue      X    X    X    X    X    X    X       7    
Yellowknife         YELL  Rogue      X    X    X    X    X    X    X       7    
Zimmerwald          ZIMM  Trimble    X    X    X    X    X    X    X       7    
Zimmerwald          ZIMA  Ashtech    X    X    X    X    -    -    -       4    
------------------  ----  --------  ---  ---  ---  ---  ---  ---  ---  -----    
Totals:               41  stations   37   40   40   37   35   36   35    260    

Notes:  CDDIS disk archive status:  

           GPS1:[GPSDATA] directory contains days 206 thru 223
           GPS2:[GPSDATA] directory contains days 224 and on
           GPS3:[PRODUCTS] directory contains IGS products from GPS week 0649

        * denotes data replaced by CIGNET on August 26, 1992

        CDDIS has begun to retrieve data from the IGN for some European 
          stations.

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

From:     James F. Zumberge
Subject:  JPL orbit products
          ------------------

We omitted from our original description (IGS Mail Message 37) that JPL's orbit
product, like the broadcast ephemeris, refers to the coordinates of the 
spacecraft's antenna phase center, not its center of mass.

This decision was based on our feeling that the majority of users would
use the information as a replacement to the broadcast ephemeris, in which
case referring to center-of-mass coordinates would be inappropriate.

Although the information which follows is not necessary for such users, for
completeness we provide here our assumptions about the vector from
the spacecraft center of mass to the antenna phase center.

(1) No distinction is made among L1, L2, and LC. According to our contact with
the Aerospace Corporation, the phase centers have not been well enough
measured to make such a distinction.

(2) The coordinate system in the table below has Z pointing from the
satellite's center of mass to the Earth's center of mass, Y as the cross
product of Z with the vector from satellite to sun, and X completes a
right-handed system (X cross Y = Z).

          Vector from Center of Mass to Antenna Phase Center

                        X (m)        Y (m)        Z (m)

Block I satellites      0.21         0.0          0.854

Block II satellites     0.279        0.0          0.9519

The figures are believed accurate to +/- a few centimeters.

(3) When the Earth, sun, and spacecraft are in alignment, the X and Y
components of the above coordinate system are ill-defined. Therefore, if
the satellite-sun and satellite-Earth directions are within 3 degrees of
being collinear, only the radial (Z) component above is used.

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

From:     Bob E. Schutz
Subject:  GPS week 657 solution
          ---------------------

      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: 28 AUGUST 1992

Notes:  
  1.  RMS is in cm
  2.  The following satellites were included (by PRN): 2,3,11,12,13,14,15,16,17,18,19,20,21,23,24,25,26,28
  3.  AS was "on" during Day 222, 223, 228.  These days are not included in the solution.

   MJD         x        y    UT1        sx       sy     sUT1     RMS   cxy   cxUT1 cyUT1     Sta  Sat Passes

 48845.5 -0.06903  0.47492  0.000000  0.00014  0.00016  0.000000 2.14 -0.071  0.000  0.000    24  18   497
 48846.5 -0.06699  0.47635  0.000000  0.00015  0.00020  0.000000 2.02 -0.011  0.000  0.000    23  18   468
 48847.5 -0.06458  0.47941  0.000000  0.00013  0.00016  0.000000 2.07 -0.130  0.000  0.000    24  18   514
 48848.5 -0.06240  0.47881  0.000000  0.00014  0.00014  0.000000 2.30  0.100  0.000  0.000    24  18   505

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

From:     Ruth E. Neilan
Subject:  AS and the Tracking Network
          ---------------------------

Tracking Network Performance and the effects of AS
Ref. IGS Mail Messages 69,73 & 75 

There is legitimate concern over the loss of quality data 
for the tracking network during the implementation of 
AS (Anti-spoofing).  AS has been consistently activated 
on the Block II and IIa satellites over the weekends since 
the beginning of August.   The ultimate impact is that 
during the Epoch'92 campaign when 80 to 100 or more 
codeless GPS receivers were deployed for the 
densification of the global network and the robustness of 
the tracking network is lost for these time periods.

It is therefore important to summarize the status of the 
activities assessing the impact of AS on the operational 
IGS precision p-code (Rogue) tracking network:

1) This is not an inherent problem in the tracking loop 
software of the Rogue receivers.  Conversations with the 
Rogue development team indicate that the codeless data 
quality (rms) is sub-centimeter and consistent with 
codeless data produced by the other codeless receiver 
types.  Questions concerning this can be directed to Tom 
Meehan at JPL.
2) Two problems exist with the receiver software which 
are in the process of being fixed,  However, it is helpful 
to understand a bit about the architecture of the 
software.  The standard receiver software (Meenix) is 
present in all Rogue receivers.  It is enhanced at most 
locations through the CONAN software, which permits 
very efficient storage and uploading of the GPS data.  
There are two type of stations:
3 Deep Space Net stations that have continuous, 
dedicated communication lines for data transmission and 
operate under Meenix only; .
30 additional stations worldwide which depend on CONAN 
for periodic receiver access and data retrieval,  at a 
great reduction in communication costs .

The problems:
Meenix at the DSN does not record the Broadcast 
ephemeris correctly.
 
Meenix does however, handle AS correctly with the latest 
upgrade of the software.  Unfortunately this version of 
software was still in soak in late July at the DSN, but 
the data from the 3 DSN sites over the last weekend 
should provide the processing centers analysts with a 
Rogue codeless dataset.  The DSN stations are Canberra, 
Madrid and Goldstone.

The other 30 stations also operate this new version of 
Meenix and are quite capable of producing the proper AS 
data -- with the bypass of the CONAN efficiency.  As 
mentioned in U. Lindqwister's message included in IGS 
Mail 75, one can upload the data more frequently and 
retrieve the MEENIX output.  

Future problems can be better handled if we have 
increased communication among the processing centers 
and the Network Operations Group at JPL.  All  messages 
should be sent to:  
[email-masked]
with attention to Ulf Lindqwister who is responsible for 
network engineering.
Whenever a data problem with receivers is encountered 
it would be helpful to be more specific and to 
immediately bring this to the attention of ALL 
processing centers and the Central Bureau (i.e.: this 
problem was discovered on day __, at these stations __, 
evident on these satellite(s) __ , for the time period __). 

ALL processing centers, please comment on the data files 
from the 3 DSN sites for the past weekend.  Feedback is 
important.

A schedule for upgrade of the additional 30 receivers  
which are operating with CONAN is being developed.  If 
any other problems are evident it would be best to try to 
incorporate them in the next upgrade.   In the interim, if 
there are periods of time when the AS codeless is 
desired from some stations, follow the directions given 
in IGS message 75 or contact U. Lindqwister or myself.  
Operationally this type of data upload  is rather 
cumbersome and time consuming, but perhaps it would be 
very worthwhile for a few globally distributed. stations.  

Sincerely,
Ruth Neilan
Central Bureau of the IGS

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

From:     Yehuda Bock
Subject:  SIO PGGA/GARNER Analysis Center Results (28 August, 1992)
          ---------------------------------------------------------

Yehuda Bock, Peng Fang and Keith Stark

This week we include the following information:

(1) Note on SA tests
(2) Polar motion results for 15-19 August
Note: We have a problem with the solutions for 20 and 21 August which
we are currently investigating. We will include these days in our
next report.
                 
(1) Note on SA tests

Our solutions during AS periods do not include data from
the affected satellites (i.e., PRN's 2,16,17,20,21,23,24,25,26,28).
The consequences at this stage:
(a) Our orbital products do not include improvements to these satellites
during the AS period.
(b) Polar motion values for the AS period have larger uncertainties.

(2) Polar motion results.

    The set of coordinates described below is based on the 
    analysis of the of the first 58 days of the IGS campaign, and
    include coordinates of the PGGA sites after the Landers earthquake.
    The polar motion table has been updated for the period 15-19 August.

1. Analysis Center: Scripps Institute of Oceanography
2. Solution Identifier: Submission 920828
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 u
   (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 
X23601M001 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 
X40400M007 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 
X40405S031 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 
X40407M003 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 
X40460M002 SIO2      -2455539.248 -4767224.071  3441628.810 48829.5    17.0      0.002  0.004  0.003 -0.0335  0.0302  0.0180 
X40460M003 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 
X41705M003 SANT       1769692.988 -5044573.802 -3468321.387 48829.5    48.0      0.006  0.007  0.004  0.0013 -0.0044  0.0071 
X50103S017 CANB(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 
X92201M003 Pamatai   -5245195.149 -3080472.127 -1912825.677 48829.5    20.0      0.006  0.006  0.004 -0.0416  0.0527  0.0293 
X50134M001 Darwin    -4091358.542  4684606.625 -1408580.749 48829.5    11.0      0.007  0.006  0.005 -0.0376 -0.0146  0.0609 
X40420M006 VNDP      -2678089.800 -4525437.755  3597431.423 48829.5    15.0      0.002  0.003  0.003 -0.0302  0.0327  0.0187 
NOTES:
 (a) 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).
 (b) 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).
 (c) 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.

6. Solution 920828
 
* MIT_TO_IERS: Run on 1992/ 8/27 22:44
* Input file : pmu082792.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
 48835.5  -0.08915  0.44907  0.398750  0.00046 0.00051 0.000000 1.71  0.179  0.000  0.000   27  18 0
 48836.5  -0.08731  0.45118  0.396020  0.00039 0.00053 0.000000 1.49  0.066  0.000  0.000   27  10 0
 48837.5  -0.08407  0.45239  0.393620  0.00021 0.00025 0.000000 1.68 -0.011  0.000  0.000   29  18 0
 48838.5  -0.08178  0.45588  0.391677  0.00012 0.00012 0.000000 1.59  0.065  0.000  0.000   28  18 0
 48839.5  -0.08006  0.45774  0.390212  0.00012 0.00013 0.000000 1.80  0.114  0.000  0.000   29  18 0
 48840.5  -0.07784  0.45927  0.389148  0.00012 0.00012 0.000000 2.08  0.058  0.000  0.000   29  18 0
 48841.5  -0.07614  0.46140  0.388356  0.00013 0.00014 0.000000 2.04  0.061  0.000  0.000   27  18 0
 48842.5  -0.07490  0.46395  0.387691  0.00047 0.00046 0.000000 1.31  0.259  0.000  0.000   28  17 0
 48843.5  -0.07253  0.46654  0.386999  0.00036 0.00041 0.000000 1.40  0.247  0.000  0.000   26   8 0
 48844.5  -0.07071  0.46924  0.386177  0.00032 0.00027 0.000000 1.54  0.179  0.000  0.000   27  18 0
 48845.5  -0.06831  0.47233  0.385147  0.00017 0.00021 0.000000 1.75  0.172  0.000  0.000   27  18 0
 48846.5  -0.06668  0.47411  0.383853  0.00014 0.00014 0.000000 1.89  0.085  0.000  0.000   27  18 0
 48847.5  -0.06460  0.47653  0.382298  0.00013 0.00013 0.000000 2.09  0.059  0.000  0.000   28  18 0
 48848.5  -0.06236  0.47802  0.379500  0.00013 0.00013 0.000000 1.69  0.069  0.000  0.000   28  18 0
 48849.5  -0.05936  0.47947  0.377556  0.00032 0.00037 0.000000 1.22  0.237  0.000  0.000   28  13 0
 48850.5  -0.05897  0.48090  0.375550  0.00039 0.00042 0.000000 1.46  0.336  0.000  0.000   27   8 0
 48851.5  -0.05523  0.48289  0.373590  0.00020 0.00022 0.000000 2.33  0.028  0.000  0.000   28  18 0
 48852.5  -0.05191  0.48457  0.371746  0.00014 0.00014 0.000000 1.59  0.060  0.000  0.000   27  18 0
 48853.5  -0.04896  0.48645  0.370076  0.00013 0.00014 0.000000 1.82  0.017  0.000  0.000   26  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:     Joachim Feltens
Subject:  esa06587.sum
          ------------

-------------------------
ANALYSIS CENTRE: ESA/ESOC
-------------------------

OUTLINE OF THE ESTIMATION OF GPS-ORBITS AND EARTH ROTATION PARAMETERS AT THE
ESOC PROCESSING CENTER FOR IGS

J.M.Dow, S.Casotto, J.Feltens, S.Frey, C.Garcia-Martinez, T.Martin-Mur

Description of analysis for period 1992 August 16-22 (days 229-235,GPS week 658)

 *******************************************************************************
 On days 229, 230 and 235 (August 16,17 and 22) there have been anti-spoofing
 tests. One test period lasted from day 228 to 230, the other one from day 235
 to 237. So for this days our NGS-Format orbit files only contain such satel-
 lites, that obviously were not affected by anti-spoofing (see table below).
 *******************************************************************************

1. SOFTWARE USED:   GPSOBS/BAHN5

2. MODELS AND CONSTANTS USED

   a) General:                 no changes with respect to previous runs

   b) Satellite Force Model:   no changes with respect to previous runs

      The following table gives an overview over the satellites that have been
      used for the different one-day-arc solutions:     "+" used, "-" not used.
      __________________________________________________________________________
      PRN02| 03| 11| 12| 13| 14| 15| 16| 17| 18| 19| 20| 21| 23| 24| 25| 26| 28|
      ____-|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
      DAY| |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
      229|A| - | + | + | + | + | + | A | A | + | + | A | A | A | A | A | A | A |
      230|A| - | + | + | + | + | + | A | A | + | + | A | A | A | A | A | A | A |
      231|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      232|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      233|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      234|+| + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
      235|A| + | + | + | + | + | + | A | A | + | + | A | A | A | A | A | A | A |

      "A" means anti-spoofing tests

   c) Ground Stations (if being estimated, one position (X,Y,Z) every day):

      The following table gives an overview over the ground stations,  that have
      been included into the GPS-data processing at ESOC. Except where otherwise
      noted ("remarks"), corrections are taken from IGS Mail No. 65  -  IGS site
      information and coordinates,updated version of IERS/IGS Tables in IGS Mail
      No. 33  -  (Boucher and Altamimi).
      __________________________________________________________________________
                          |             |    |    GPS WEEK 658     |
                          |             |    | 2  2  2  2  2  2  2 |
                          |             |    | 2  3  3  3  3  3  3 |
              SITE        |   COUNTRY   |CODE| 9  0  1  2  3  4  5 |  REMARKS
      --------------------|-------------|----|---------------------|------------
        Algonquin         | Canada      |ALGO| F  F  F  F  F  F  F |
        CANB/Tidbinbilla  | Australia   |TIDB| e  e  e  e  e  e  e |
        Penticton         | U.S.A.      |DRAO| F  F  F  F  F  F  F |
        Fairbanks         | U.S.A/Alaska|FAIR| F  F  F  F  F  F  F |
        Goldstone         | U.S.A.      |GOLD| F  F  F  F  F ----- |
        Hartebeesthoek    | South Africa|HART| F  F  F  F  F  F  F |
        Herstmonceux      | U.K.        |HERS| -- F  F  F  F  F  F |
        Kokee Park        | U.S.A/Hawaii|KOKB| e  e  e  e  e  e  e |
        Kourou      (ESA) | French Guyan|KOUR| e  e  e ----------- | own estim.
        Madrid            | Spain       |MADR| F  F  F  F  F  F  F |
        Maspalomas  (ESA) | Spain/Can.Is|MASP| e  e  e  e  e  e  e |
        Matera            | Italy       |MATE| F  F  F  F  F  F  F |
        McMurdo           | Antarctica  |MCMU| e  e  e  e  e  e  e |
        Metsahovi         | Finland     |METS| F  F  F  F  F  F  F |
        Ny Alesund/Spitzb.| Norway      |NYAL| e  e  e  e  e  e -- |
        Onsala            | Norway      |ONSA| e  e --- e  e  e  e |
        Pamatai/Tahiti    | France      |PAMA| e  e  e  e  e  e  e |
        Richmond          | U.S.A/Florid|RCM2| e  e  e --------- e | own estim.
        Santiago          | Chile       |SANT| -- F  F  F  F  F  F |
        Tai-Shi           | Taiwan      |TAIW| e  e  e  e  e  e  e |
        Usuda             | Japan       |USUD| e  e  e  e  e  e  e |
        Wettzell          | Germany     |WETT| -- F  F  F  F  F -- |
        Yaragadee         | Australia   |YAR1| F  F  F  F  F  F  F |
        Yellowknife       | Canada      |YELL| F  F  F  F  F  F  F |

      with: "F" ... coordinates of ground station kept fixed,
            "e" ... coordinates of ground station estimated,
            "-" ... ground station not included on that day.

   d) Earth Rotation Parameters:   no changes with respect to previous runs

   e) Observations:                no changes with respect to previous runs

3. PARAMETERS TO BE ESTIMATED PER 1-DAY ARC

   a) Satellite Parameters per Spacecraft:    no changes with respect to
                                                                   previous runs
   b) Station related parameters per ground station:  no changes with respect to
                                                                   previous runs
   c) Earth Rotation Parameters:              no changes with respect to
                                                                   previous runs
4. PARAMETERS TO BE KEPT FIXED IN THE SOLUTION

   a) Satellite Parameters per Spacecraft:    no changes with respect to
                                                                   previous runs
   b) Station related parameters per Ground Station:  no changes with respect to
                                                                   previous runs
5. PRODUCTS GENERATED

   The following products are generated and stored in CDDIS at NASA/GSFC:

   ESA06580.EPH   - Precise GPS orbits for day 229 (August 16)
   ESA06581.EPH   - Precise GPS orbits for day 230 (August 17)
   ESA06582.EPH   - Precise GPS orbits for day 231 (August 18)
   ESA06583.EPH   - Precise GPS orbits for day 232 (August 19)
   ESA06584.EPH   - Precise GPS orbits for day 233 (August 20)
   ESA06585.EPH   - Precise GPS orbits for day 234 (August 21)
   ESA06586.EPH   - Precise GPS orbits for day 235 (August 22)
   ESA06587.ERP   - Earth rotation results for week beginning 1992 August 16
   ESA06587.SUM   - The name of this text file