Subject: [IGSMAIL-55] GFZ analysis results
From: Ch. Reigber
Date: 28 JUL 1992 09:45:19

***********************************************************************
IGS Electronic Mail       30-JUL-1992 08:49:17       Message Number 55
***********************************************************************
 
==============================================================================
                   THIS FILE CONTAINS 3 MESSAGES
==============================================================================

From:    Ch. Reigber
Subject: GFZ analysis results
         --------------------

Report for GPS Week 652 (Days 187-193) from GFZ
===============================================

This report is generated by the GeoForschungsZentrum Potsdam (GFZ) 
on a weekly basis for the International GPS Geodynamics Service (IGS). 

PRODUCT SUMMARY 

   GFZ06527.EPH:  GPS ephemerides for GPS Week 651 (SP3 format, pos. and vel.)
   GFZ06527.ERP:  Earth rotation parameter (UT1 corrections are not included)
   GFZ06527.CLK:  ST and SV clock parameters of each observation epoch (the
                  maser-based clock at Fairbanks is taken as reference clock)
   GFZ06527.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.

CORE STATION SUMMARY

The Core Station data used in the solutions is given below.  

                                      Day of Week 652
                                    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       DS10                X  X  X  X  X  X  X
Hartebeesthoek  HART                X  X  X  X  X  X  X
Kokee Park      KOKB                X  X  X  X  X  X  X
Mc Murdo        MCMU                X  X  X  X  X  -  X
Ny-Alesund      NALL                X  X  X  X  X  X  X
Pamatai         PAMA                X  X  X  X  X  X  X
Santiago        SANT                X  X  X  X  X  X  X
Tai Shi         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        WTZL                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         35185 35377 44851 46041 40830 37857 41041 
   RMS of carrier phases [cm]       4.4   4.4   4.4   2.9   3.5   5.0   3.8
   RMS of code measurements [cm]   44.7  46.7  46.6  44.9  46.2  49.1  43.1
   ------------------------------------------------------------------------

INFORMATIONS TO PRODUCT GENERATION

  The calculation of the 7-day ephemerides file is described below.

            Day of GPS Week 652        [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.  

-  GFZ06527.EPH (Seven 1-day segments)
   ============

   In the table below the overlap rms differences [m] in radial,
   cross- and along-track component are presented.

 prn            187    188    189    190    191    192    193 |  Mean
======================================================================
   2 radial   0.400  0.272  0.363  0.224  0.307  0.618  0.503 |  0.384
   2 cross    0.272  0.378  0.933  0.565  0.668  1.591  0.990 |  0.771
   2 along    1.134  0.648  0.970  0.811  0.721  1.789  1.246 |  1.046
----------------------------------------------------------------------
   3 radial   0.215  0.263  0.200  0.407  0.371  0.670  0.266 |  0.342
   3 cross    0.554  0.489  0.480  0.490  0.559  2.058  1.261 |  0.842
   3 along    0.551  0.515  0.555  0.780  0.644  1.571  0.968 |  0.798
----------------------------------------------------------------------
  11 radial   0.222  0.153  0.094  0.260  0.319  0.167  0.309 |  0.218
  11 cross    0.269  0.287  0.618  0.372  0.466  0.871  0.609 |  0.499
  11 along    0.596  0.384  0.468  0.666  0.429  1.363  0.729 |  0.662
----------------------------------------------------------------------
  12 radial   1.478  2.006  2.776  0.698  1.207  7.561  1.856 |  2.512
  12 cross    5.462  5.191  6.591  4.644  1.391  7.672  4.180 |  5.019
  12 along    3.837  4.546  6.355  3.418  2.329 17.748  5.212 |  6.206
----------------------------------------------------------------------
  13 radial   0.184  0.236  0.329  0.089  0.162  0.327  0.593 |  0.274
  13 cross    0.681  0.286  0.473  0.208  0.592  0.903  0.781 |  0.561
  13 along    1.007  0.730  1.150  0.643  0.515  1.102  1.146 |  0.899
----------------------------------------------------------------------
  14 radial   0.391  0.322  0.261  0.281  0.270  0.629  0.373 |  0.361
  14 cross    0.439  0.445  0.396  0.382  0.425  1.549  0.549 |  0.598
  14 along    1.123  0.664  0.729  0.579  0.570  1.614  0.908 |  0.884
----------------------------------------------------------------------
  15 radial   0.422  0.267  0.317  0.737  0.461  0.413  0.465 |  0.440
  15 cross    0.615  0.261  0.678  0.682  0.606  1.278  0.544 |  0.666
  15 along    0.792  0.528  0.637  1.669  0.874  1.941  0.880 |  1.046
----------------------------------------------------------------------
  16 radial   0.352  0.321  0.377  0.261  0.224  0.948  0.419 |  0.415
  16 cross    0.521  0.513  0.654  0.588  0.458  1.215  0.439 |  0.627
  16 along    0.840  0.819  0.836  0.679  0.590  1.840  0.865 |  0.924
----------------------------------------------------------------------
  17 radial   0.381  0.411  0.506  0.382  0.320  0.683  0.404 |  0.441
  17 cross    0.563  0.455  0.663  0.394  0.468  1.217  0.993 |  0.679
  17 along    0.729  0.813  1.010  0.643  0.751  2.630  1.931 |  1.215
----------------------------------------------------------------------
  18 radial   0.140  0.182  0.139  0.360  0.207  0.301  0.600 |  0.276
  18 cross    0.296  0.304  0.510  0.414  0.234  0.821  0.720 |  0.471
  18 along    0.489  0.327  0.547  0.933  0.613  1.189  1.245 |  0.763
----------------------------------------------------------------------
  19 radial   0.312  0.262  0.444  0.327  0.439  0.250  0.610 |  0.378
  19 cross    0.356  0.295  0.475  0.292  0.710  0.962  0.455 |  0.506
  19 along    0.747  0.613  1.260  0.703  0.908  1.019  1.128 |  0.911
----------------------------------------------------------------------
  20 radial   0.233  0.250  0.344  0.369  0.242  0.650  0.561 |  0.378
  20 cross    0.312  0.242  0.836  0.458  0.577  1.053  0.513 |  0.570
  20 along    0.683  0.518  0.871  0.783  0.582  1.238  1.359 |  0.862
----------------------------------------------------------------------
  21 radial   0.112  0.275  0.273  0.418  0.265  0.414  0.414 |  0.310
  21 cross    0.349  0.452  0.625  0.867  0.258  1.466  2.063 |  0.869
  21 along    0.269  0.619  0.566  1.182  0.460  1.461  1.417 |  0.853
----------------------------------------------------------------------
  23 radial   0.163  0.184  0.157  0.257  0.080  0.196  0.055 |  0.156
  23 cross    0.422  0.264  0.612  0.613  0.385  1.763  1.803 |  0.837
  23 along    0.387  0.497  0.460  0.757  0.329  1.654  0.712 |  0.685
----------------------------------------------------------------------
  24 radial   0.199  0.309  0.325  0.402  0.267  0.416  0.729 |  0.378
  24 cross    0.217  0.350  0.503  0.438  0.392  1.209  0.981 |  0.584
  24 along    0.574  0.649  0.982  0.961  0.607  1.133  1.407 |  0.902
----------------------------------------------------------------------
  25 radial   0.254  0.313  0.423  0.429  0.316  0.490  0.523 |  0.393
  25 cross    0.565  0.492  0.681  0.293  0.327  0.671  0.931 |  0.566
  25 along    0.784  0.998  1.109  0.823  0.683  0.955  0.984 |  0.905
----------------------------------------------------------------------
  28 radial   0.280  0.278  0.443  0.142  0.465  0.284  0.295 |  0.312
  28 cross    0.364  0.386  0.687  0.290  0.879  0.920  0.975 |  0.643
  28 along    0.623  0.521  1.032  0.372  1.001  1.327  1.148 |  0.861
======================================================================

-  GFZ06527.ERP
   ============

   MJD    x    sigmax    y    sigmay

 48808 -.1401  .0008  0.3866  .0009  
 48809 -.1405  .0007  0.3852  .0008  
 48810 -.1389  .0007  0.3875  .0008  
 48811 -.1357  .0007  0.3908  .0007  
 48812 -.1321  .0006  0.3945  .0007  
 48813 -.1306  .0008  0.3978  .0008  
 48814 -.1308  .0008  0.3992  .0010  

-  GFZ06527.CLK
   ============

   Description of the clock parameter file (e.g. GFZ06527.CLK):

   This file contains the clock parameter of all available
   stations and satellites for each epoch related to a fixed
   reference clock (if possible, the maser based clock at Fairbanks 
   is taken as reference). For each epoch the file consists of the
   following informations:

   (1) header record 
      
       column  format variable  meaning
        6-14   F9.2   DATE      date related to J2000.0
       22-30   F9.2   TIME      seconds of day (GPS Time)
       46-49   A4     REFCLK    4 Char. station ID of reference clock
       58-60   I3     NCLK      number of clock corrections for 
                                specified epoch

   (2) data record 

       (ID(I),CLOCK(I),I=1,NCLK)
       format: (4(A4,F12.6,1x))

       with  ID ...     4 Char. ID for station clocks
                        PRN No. for satellite clocks
             CLOCK .... clock corrections [micro seconds] related to 
                        reference clock

   Examplary three epochs of this file are listed below.

DATE: -2736.50  TIME:   360.00  REF. CLOCK:  FAIR  NCLK:  16
FAIR    0.000000 ALGO   -0.746915 YELL  387.718353 KOKB   -0.674088
TROM    9.330571 WTZL   -1.119087 NALL -136.354828 USUD    0.574582
   3  350.561035   16   15.260936   17    3.611038   18    3.732432
  19  -25.187544   20   -0.147432   24   98.387146   25   22.916180
DATE: -2736.50  TIME:   840.00  REF. CLOCK:  FAIR  NCLK:  16
FAIR    0.000000 ALGO   -0.747267 YELL  387.780792 KOKB   -0.674292
TROM    9.341206 WTZL   -1.120288 NALL -136.485764 USUD    0.574067
   3  350.587769   16   15.399527   17    3.573865   18    3.788386
  19  -25.274937   20   -0.060598   24   98.258797   25   22.969181
DATE: -2736.50  TIME:  1320.00  REF. CLOCK:  FAIR  NCLK:  21
FAIR    0.000000 ALGO   -0.747822 YELL  387.842712 KOKB   -0.674714
TROM    9.351743 WTZL   -1.121624 YAR1   -0.773147 NALL -136.617538
USUD    0.574093 HART   -0.712551    3  350.614563   14    0.647907
  15    4.877884   16   15.333588   17    3.661784   18    3.776476
  19  -25.179214   20   -0.176447   24   98.486992   25   22.963224
  28   -8.705925

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

From:    Yehuda Bock
Subject: Onsalo problems
         ---------------

We have found the ONSALA data of day 204 and first 8 hours of
205 are bad. It appears that the receiver had a hardware problem,
which caused the satellite clocks being modeled as a big slope.

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

From:    James F. Zumberge
Subject: JPL analysis results
         --------------------

J F Zumberge, G Blewitt, M B Heflin, D C Jefferson, F H Webb

all at the Jet Propulsion Laboratory, California Institute of Technology, 
Pasadena, CA  91109.

The following files have been posted on BODHI (for access to BODHI contact
[email-masked]) and should also be available shortly from the CDDIS
(contact [email-masked]):

_______________________________________________________________________________
filename               contents
_______________________________________________________________________________
jpl06537.sum           This text file

jpl06537.erp           Earth orientation for 5 days beginning 1992 Jul 12

jpl06530.sp3           Precise GPS ephemerides, 1992 Jul 12, NGS sp3 format
jpl06531.sp3           Precise GPS ephemerides, 1992 Jul 13
jpl06532.sp3           Precise GPS ephemerides, 1992 Jul 14
jpl06533.sp3           Precise GPS ephemerides, 1992 Jul 15
jpl06534.sp3           Precise GPS ephemerides, 1992 Jul 16

jpl06530.sp1           Precise GPS ephemerides, 1992 Jul 12, NGS sp1 format
jpl06531.sp1           Precise GPS ephemerides, 1992 Jul 13
jpl06532.sp1           Precise GPS ephemerides, 1992 Jul 14
jpl06533.sp1           Precise GPS ephemerides, 1992 Jul 15
jpl06534.sp1           Precise GPS ephemerides, 1992 Jul 16
_______________________________________________________________________________

Because Deep Space Network (DSN) data for the week have been delayed, results
are current only through July 16. The remainder of the week will be included in
next week's submission.

As mentioned in last week's .sum file the NANUs (151-92196 and 155-92197)
regarding prn 24 on Jul 14 and prn 25 on Jul 15 were confirmed. It looks like
prn 12 is behaving properly again.

WARNING: We recommend against using prn 24 on Jul 14.
WARNING: We recommend against using prn 25 on Jul 15.

The following table contains our pole position measurements:

JPL UTPM TABLE                                            (1992 Jul 12 - Jul 16)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS    
           ''        ''        sec     ''     ''      sec
 48815.5  -.12651   .40865   .00000  .00024  .00029  .00000  .0  .31  .00  .00  25 17  0
 48816.5  -.12692   .41055   .00000  .00023  .00028  .00000  .0  .21  .00  .00  27 17  0
 48817.5  -.12580   .41290   .00000  .00025  .00029  .00000  .0  .20  .00  .00  27 16  0
 48818.5  -.12451   .41301   .00000  .00025  .00029  .00000  .0  .25  .00  .00  26 16  0
 48819.5  -.12358   .41533   .00000  .00024  .00027  .00000  .0  .20  .00  .00  25 17  0
END UTPM TABLE

The following table indicates the "orbit repeatability", as defined in IGS Mail
Message 37, for the first five days of GPS week 653:

JPL ORBIT REPEATABILITY TABLE                GPS week 653 (1992 Jul 12 - Jul 16)
      92  7 12   92  7 13   92  7 14   92  7 15   92  7 16
prn    rms (m)
  2       0.52       1.12       0.69       1.03       0.6 
  3       0.37       0.53       0.34       0.40       0.2 
 11       0.38       0.48       0.52       0.60       0.3 
 12       0.46       0.88       1.17       0.54       0.5 
 13       0.92       0.63       0.77       0.69       0.4 
 14       1.10       1.23       1.38       0.91       0.7 
 15       0.95       0.70       0.89       0.67       0.6 
 16       0.35       0.45       0.64       0.48       0.2 
 17       0.66       0.87       0.84       0.77       0.7 
 18       0.40       0.55       0.40       0.31       0.2 
 19       0.65       0.57       0.56       0.46       0.4 
 20       0.62       0.73       0.57       0.63       0.3 
 21       0.36       0.45       0.37       0.46       0.6 
 23       0.41       0.53       0.27       0.27       0.7 
 24       0.98       0.9                   0.5        0.4 
 25       0.88       1.11       0.4                       
 28       1.36       1.17       1.38       1.08       0.6 
END ORBIT REPEATABILITY TABLE

As described in IGS Mail Message 37, the following table compares the JPL
precise ephemerides with those from the broadcast ephemeris:

JPL COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES
      92  7 12   92  7 13   92  7 14   92  7 15   92  7 16
prn    rms (m)
  2       6.3        5.6        6.0        6.4        6.3 
  3      11.2       12.6       13.2       12.8       11.3 
 11       5.7        9.0        5.4        6.5        5.1 
 12      12.7        8.0       17.0       13.5       11.6 
 13       5.5        6.1        8.7        7.3        7.9 
 14       5.7        5.9        6.1        6.2        6.4 
 15       6.9        8.9        9.2        8.2        7.4 
 16       8.1        7.4        9.9       10.0       11.8 
 17       7.2        7.0        7.9        8.4        7.7 
 18       7.4        7.2        7.4        7.5        8.1 
 19       8.1        7.3        7.9        8.2        6.6 
 20       4.5        3.7        4.6        4.2        5.0 
 21       6.1        5.9        5.1        5.1        5.7 
 23       5.9        4.9       10.2        7.2        4.4 
 24      15.1       13.4                  13.5       12.6 
 25       9.1        9.8       10.5                  17.5 
 28       5.3        4.3        4.2        5.0        4.1 
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES