Subject: [IGSMAIL-129] JPL analysis report
From: J.F. Zumberge
Date: 5 NOV 1992 18:05:45

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IGS Electronic Mail        5-NOV-1992 18:05:45       Message Number 129
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                   THIS FILE CONTAINS 2 MESSAGES
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From:    J.F. Zumberge
Subject: JPL analysis report
         --------------------

Submitted by

D C Jefferson, J F Zumberge, G Blewitt, M B Heflin, 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]):

______________________________________________________________________________
filename               contents
______________________________________________________________________________
jpl06677.sum           This text file.
jpl06677.erp           Earth rotation parameters for GPS week 667.
jpl06677.sp1           GPS ephemerides for GPS week 667, sp1 format.
jpl06677.sp3            "       "       "   "   "    " , sp3   "   .
______________________________________________________________________________

A-S testing occurred during "17 Oct 92 0100 UT to 19 Oct 92 1000 UT" and
"24 Oct 92 0100 UT to 26 Oct 92 1000 UT", according to the file
pub/gps/gpstd.txt obtained from tycho.usno.navy.mil. Results for Sunday,
Oct 18, and Saturday, Oct 24, are not included in this submission. The
results for Monday, Oct 19, exclude data from Block-II satellites
acquired when operating in cross-correlated mode.

Also, according to the file pub/gps/gpsn4.txt, GPS25 was scheduled unusable
for up to 12 hours on Oct 22 (day 296), beginning at 22:00:00. Our analysis
confirms that the behaviour of this satellite is poorly modeled on the 
FOLLOWING day, as most of this 12 hour period occurs on Oct 23 (day 297).
The corresponding data have thus been de-weighted.

Beginning this week, we analyze data from GPS27 without de-weighting. As
our orbit comparison tables indicate, our model reasonably represents 
the behavior of this satellite.

WARNING: GPS25 is not well modeled on Friday, Oct 23. We recommend using
the broadcast ephemeris for that satellite and day.

JPL LODR TABLE                               GPS week 667 (1992 Oct 19 - Oct 23)
  MJD       LODR     +/-
          (ms/day)
 48914.5    2.65     0.10
 48915.5    2.79     0.06
 48916.5    2.04     0.06
 48917.5    2.14     0.06
 48918.5    2.77     0.06
END LODR TABLE

NOTE: In the following table, UT1R-UTC are the assumed nominal values from
IERS Bulletin-B predicts; estimated LODR values are given in the previous
table. See IGS Mail Message 97 for details.

JPL UTPM TABLE                               GPS week 667 (1992 Oct 19 - Oct 23)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS    
           ''        ''        sec     ''     ''      sec
 48914.5   .10429   .49425   .24721  .00049  .00054  .00000  .0 -.08  .00  .00  25 19  0
 48915.5   .10516   .49385   .24499  .00018  .00019  .00000  .0 -.07  .00  .00  25 19  0
 48916.5   .10789   .49228   .24276  .00019  .00023  .00000  .0 -.13  .00  .00  25 19  0
 48917.5   .11006   .49093   .24053  .00018  .00019  .00000  .0 -.04  .00  .00  26 19  0
 48918.5   .11276   .49020   .23829  .00018  .00020  .00000  .0 -.05  .00  .00  26 19  0
END UTPM TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 667:

JPL ORBIT REPEATABILITY TABLE                GPS week 667 (1992 Oct 19 - Oct 23)
                 92 10 19   92 10 20   92 10 21   92 10 22   92 10 23
prn    rms (m)
  2                  0.3        0.52       0.52       0.48       0.5 
  3                  0.9        0.84       0.74       0.53       0.3 
 11                  0.2        0.27       0.51       0.35       0.5 
 12                  0.3        0.33       0.58       0.35       0.3 
 13                  0.5        0.44       0.39       0.27       0.3 
 14                  0.5        0.52       0.42       0.46       0.4 
 15                  0.5        0.37       0.32       0.33       0.5 
 16                  0.6        0.61       0.64       0.98       0.7 
 17                  0.5        0.40       0.41       0.48       1.2 
 18                  0.4        0.61       0.88       0.61       0.4 
 19                  0.9        0.59       0.34       0.76       0.9 
 20                  0.6        0.30       0.17       0.45       0.2 
 21                  0.3        0.49       0.21       0.22       0.4 
 23                  0.2        0.40       0.28       0.34       0.6 
 24                  1.0        0.55       0.65       0.62       0.3 
 25                  0.3        0.25       0.27      13.19      37.8 
 26                  0.4        1.27       1.69       1.23       0.8 
 27                  0.5        0.39       0.54       0.72       0.4 
 28                  0.7        0.53       0.69       0.33       0.5 
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 10 19   92 10 20   92 10 21   92 10 22   92 10 23
prn    rms (m)
  2                  7.8        9.2        8.6        6.1        4.6 
  3                 13.3       14.6       15.2       14.2       14.8 
 11                  6.7        5.3        4.2        5.9        5.8 
 12                 20.3       10.2        8.4        4.5        4.1 
 13                  4.6        6.8        5.5        4.0        2.6 
 14                  5.8        6.4        5.9        5.7        6.1 
 15                  2.7        3.9        4.5       31.3        4.3 
 16                  5.8        6.2        6.5        5.7        4.8 
 17                  5.7        7.7       10.6        5.1        3.5 
 18                  7.8        9.0        6.9        6.9        8.7 
 19                  4.1        4.2        4.0        3.7        3.6 
 20                  5.7        5.2        5.0        5.1        6.1 
 21                  5.8        4.0        4.4        5.9        3.7 
 23                  9.7        4.2        4.9        3.9        7.4 
 24                 11.8       12.1       10.6        8.2        5.5 
 25                 10.3        9.6        8.6        8.3       31.6 
 26                 14.0       21.3       19.6       44.4       23.0 
 27                 15.2       13.7       15.8       18.2       15.9 
 28                  3.5        2.8        2.8        3.6        3.7 
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

The following table, as explained in IGS Mail Message 91, indicates which
tracking sites were used in this week's analysis:

JPL GROUND STATION INCLUSION TABLE           GPS week 667 (1992 Oct 19 - Oct 23)
                 92 10 19   92 10 20   92 10 21   92 10 22   92 10 23

ALBH                 X          X          X          X          X           
ALGO*                X          X          X          X          X           
FAIR*                X          X          X          X          X           
GOLD                 X          X          X          X          X           
HART*                X          X          X          X          X           
HERS                 X          X          X          X          X           
JPLM                 X          X          X          X          X           
KOSG                 X          X          X          X          X           
MADR*                X          X          X          X          X           
MASP                 X          X          X          X          X           
MATE                 X          X          X          X          X           
MCMU                 X          X          X          X          X           
METS                 X          X          X          X          X           
NYAL                 X          X          X          X          X           
ONSA                 X          X          X          X          X           
PAMA                 X          X          X          X          X           
PENT                 X          X          X          X          X           
SANT*                X          X          X          X          X           
STJO                 X          X          X          X          X           
TAIW                 X          X          X          X          X           
TROM*                X          X          X          X          X           
USUD                 X          X          X          X          X           
WETT                 X          X          X          X          X           
YAR1*                X          X          X          X          X           
YELL                 X          X          X          X          X           
_______________________
*Indicates fiducial site.
END GROUND STATION INCLUSION TABLE

==============================================================================
From:    Ch. Reigber
Subject: Report for GPS Week 666 (Days 285-291) from GFZ
         ===============================================

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

PRODUCT SUMMARY 

   GFZ0666*.EPH:  GPS ephemerides for GPS Week 666 (SP3 format, pos. and vel.)
                  * represents: 2 for Tuesday, .... , 5 for Friday
   GFZ06667.ERP:  Earth rotation parameter (UT1 corrections are not included)
   GFZ06667.CLK:  ST and SV clock parameters of each observation epoch (the
                  maser-based clock at Fairbanks is taken as reference clock)
   GFZ06667.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 285, 286
      and 291.
      The ephemerides file for the day 287 (13. Oct.) do not include 
      SV 26 because this satellite is poor modeled on that day 
*********************************************************************************

CORE STATION SUMMARY

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

                                      Day of Week 666
                                     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                 X  X  X  X 
Tromsoe         TROM                 X  X  X  X 
Usuda           USUD                 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         22629 22815 20651 22352 
   RMS of carrier phases [cm]       0.6   0.6   0.5   0.5 
   RMS of code measurements [cm]   46.4  49.4  44.0  47.0 
   ------------------------------------------------------

-  GFZ06667.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

 48908.5 0.0914 0.0006 0.4999 0.0006
 48909.5 0.0953 0.0003 0.5000 0.0003
 48910.5 0.0981 0.0002 0.4983 0.0003
 48911.5 0.1004 0.0003 0.4977 0.0003

-  GFZ06667.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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