Subject: [IGSREPORT-1007] jpl07507.sum
From: David C. Jefferson, James F. Zumberge
Date: Mon, 6 Jun 1994 14:06:19 PDT

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IGS Electronic Report    Mon Jun  6 14:06:19 PDT 1994      Message Number 1007
******************************************************************************

Author: David C. Jefferson, James F. Zumberge
Subject: jpl07507.sum

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JPL ANALYSIS REPORT   GPS-WEEK 0750 (DAYS 142-148, DATES 1994 May 22 - May 28)
******************************************************************************

Submitted by the JPL IGS/FLINN Analysis Team:

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

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

Files listed below are available in Unix compressed format and can be
retrieved using anonymous ftp to sideshow.jpl.nasa.gov (128.149.70.41),
directory pub/jpligsac/0750.  These files have also been sent to the CDDIS.

______________________________________________________________________________
filename               contents
______________________________________________________________________________
jpl07507.sum           This text file.
jpl07507.erp           Earth rotation parameters for GPS week 750.
jpl0750[0-6].sp3       GPS ephemerides for GPS week 750, sp3 format.
______________________________________________________________________________

STRATEGY UPDATE

Our strategy of allowing additional phase ambiguity parameters whenever
the discontinuity in post-fit residuals exceeds 10 cm sometimes results
in an over-parametrized problem.  The symptoms include some zero
post-fit residuals (that is, a perfect fit for some measurements) and
poor clock repeatability.  These symptoms occurred for nearly every day
in week 750.

The addition of some pseudorange data adds sufficient data strength to
remedy the situation.  Beginning this week we include, in the parameter
estimation phase of our analysis, pseudorange data from 8 sites with
TurboRogue receivers.  We have assigned a 10-m data noise sigma to these
measurements.  (For comparison, the corresponding figure for phase data
is 1 cm.)

Because we had the task of reprocessing the entire week in a small
amount of time, we have chosen to use a 20-station subset of the global
network.  The subset consists of the 13 IGS fiducial sites (two of which
have TurboRogues), 6 additional sites with TurboRogues, and 1 site which
is neither a constrained site nor has a TurboRogue.  The exclusion of
other sites is not necessarily indicative of problems at those stations.

GENERAL

The inclusion of ONSA caused an excessive number of outliers in the
analyses of days 144 and 145.  A similar problem was caused by FORT on
day 147.  We have deleted data from these sites on the corresponding
days.

WARNING: Data from ONSA excluded days 144 and 145 (May 24, 25).
WARNING: Data from FORT excluded day 147 (May 27).

JPL LODR TABLE                               GPS week 750 (1994 May 22 - May 28)
  MJD       LODR     +/-
          (ms/day)
 49494.5    2.17     0.02
 49495.5    2.12     0.02
 49496.5    2.07     0.02
 49497.5    2.04     0.02
 49498.5    1.93     0.02
 49499.5    1.83     0.02
 49500.5    1.80     0.03
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 750 (1994 May 22 - May 28)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS    
           ''        ''        sec     ''     ''      sec
 49494.5   .18587   .28996  -.14870  .00013  .00012  .00000  .0  .08  .00  .00  20 25  0
 49495.5   .18498   .28856  -.15107  .00013  .00013  .00000  .0  .08  .00  .00  20 25  0
 49496.5   .18323   .28825  -.15343  .00019  .00019  .00000  .0  .02  .00  .00  19 25  0
 49497.5   .18174   .28598  -.15577  .00017  .00017  .00000  .0  .00  .00  .00  19 25  0
 49498.5   .18078   .28313  -.15810  .00016  .00016  .00000  .0  .05  .00  .00  20 25  0
 49499.5   .17938   .28122  -.16041  .00017  .00020  .00000  .0  .03  .00  .00  18 25  0
 49500.5   .17812   .27854  -.16271  .00020  .00021  .00000  .0  .07  .00  .00  19 25  0
END UTPM TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 750:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 750 (1994 May 22 - May 28)
      94  5 22   94  5 23   94  5 24   94  5 25   94  5 26   94  5 27   94  5 28
prn   3d rss (m)
  1       0.85       1.30       1.77       1.41       0.89       0.71       0.95
  2       0.49       0.19       0.69       0.44       0.51       0.83       0.45
  4       0.58       0.67       0.51       0.41       0.56       1.14       0.61
  5       0.67       0.28       0.32       0.71       0.51       0.35       0.52
  6       0.68       0.39       0.81       0.61       0.58       0.71       0.61
  7       1.30       0.65       0.88       0.65       1.27       0.71       1.51
  9       1.17       0.92       0.75       0.92       0.53       0.93       1.15
 12       0.57       0.46       0.40       0.31       0.41       0.57       0.69
 14       0.68       0.66       0.83       0.83       0.57       0.81       0.69
 15       0.73       1.68       0.89       0.74       1.26       1.19       0.85
 16       0.25       0.46       1.18       0.96       0.79       0.47       0.43
 17       0.64       0.42       1.12       0.95       0.64       0.87       0.54
 18       0.58       1.14       1.31       1.53       0.91       0.38       0.80
 19       0.53       1.07       1.38       1.98       1.23       1.22       0.58
 20       1.07       0.24       0.41       0.43       0.37       0.31       0.49
 21       0.52       0.38       0.37       0.48       0.57       0.60       0.33
 22       0.43       0.47       0.41       0.46       1.22       1.28       1.31
 23       0.16       0.16       0.26       0.60       0.58       0.48       0.50
 24       0.44       0.58       0.69       0.45       0.70       0.88       0.73
 25       1.52       2.07       2.34       1.67       1.14       1.46       1.50
 26       1.19       0.55       0.49       1.13       0.62       0.54       0.86
 27       1.13       1.07       0.94       1.46       1.27       1.07       0.92
 28       0.57       0.44       0.74       1.00       1.12       0.93       0.95
 29       0.45       0.58       0.78       0.62       0.61       0.50       0.53
 31       0.97       0.47       0.64       0.54       0.63       0.73       0.84
_______________________
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
      94  5 22   94  5 23   94  5 24   94  5 25   94  5 26   94  5 27   94  5 28
prn   3d rss (m)
  1       8.4        8.0        7.9        8.1        8.7        7.7        7.4 
  2       4.5        5.2        8.2        8.2        5.8        5.3        3.6 
  4       9.4        9.8       10.3        9.7        9.4        9.1        9.8 
  5       3.1        3.3        6.5        6.8        5.2        4.8        5.1 
  6       9.7        9.7        7.7        6.9        8.1        6.9        8.6 
  7       8.3        8.3        8.1        9.3        9.4        9.7        8.7 
  9       6.2        4.4        7.7        6.2        6.8        6.1        9.4 
 12       4.5        3.0        7.3        7.7        5.0        4.6        5.2 
 14       3.4        4.4        3.1        3.2        3.6        3.4        3.5 
 15       4.7        4.4        5.0        5.0        5.4        4.9        5.1 
 16       5.8        6.4        8.2       10.5        8.4        7.3        7.5 
 17       4.0        4.5        6.0        5.0        5.1        4.0        4.9 
 18       7.2        7.7        8.0        8.1        9.1        9.8        7.8 
 19      10.9       10.1        9.4       12.3       11.6       10.0       10.8 
 20       4.4        6.0        6.4        5.2        3.9        5.7        5.0 
 21       4.4        3.9        4.2        5.4        4.1        3.7        5.3 
 22       3.5        4.9        6.7        4.4        4.0        3.5        6.0 
 23       3.0        3.1        3.6        2.9        3.6        3.0        3.1 
 24       6.9        8.2       10.8       10.1        9.8       10.3       10.0 
 25       7.8        6.8        8.2        8.8       10.7       12.1       10.8 
 26       5.0        6.4        7.2        6.0        4.4        4.4        4.3 
 27      10.5       10.9       12.1        9.2       11.2       10.0       11.5 
 28       5.5        4.9        4.4        4.1        4.8        5.6        4.8 
 29       3.3        2.9        3.5        4.3        5.3        5.1        4.7 
 31       4.8        5.3        5.9        5.1        4.9        5.6        5.8 
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

The following tables, as explained in IGS Report Nos. 99 and 295, indicate the
amount of global network tracking data used in this week's analysis:

JPL SITE SUMMARY TABLE (no. stations)        GPS week 750 (1994 May 22 - May 28)
      94  5 22   94  5 23   94  5 24   94  5 25   94  5 26   94  5 27   94  5 28
Fiducial 11.9       11.7       11.4       11.0       11.5       12.1       11.2
Total    18.5       18.4       16.9       16.6       17.4       16.0       15.8
END SITE SUMMARY TABLE

JPL GROUND STATION INCLUSION TABLE           GPS week 750 (1994 May 22 - May 28)
      94  5 22   94  5 23   94  5 24   94  5 25   94  5 26   94  5 27   94  5 28
site    % data
ALGO*#    103        103        102        103        103        104        101
AREQ#      60        103        104        108        104        106        107
FAIR*     104        106        101        102         98        105         92
FORT#     103         76         65         64         44          0         52
GOLD*      77         62         67         66         77         83         85
HART*      93         77         66         65         66         83         64
HOBA#     102        104        103        104        104         30          0
KOKB*     112        112        108        112        113        114        113
KOSG*      88         89         92         81         79         86         87
MADR*      67         60         81         61         69         73         68
MCMU#     110        110        110        109         88          0         44
ONSA#     101        101          0          0        100        101        104
PAMA       79         76         73         74         49         43         49
SANT*      91        104        107        107         96        103         76
TIDB*      76         62         76         71         85         82         86
TROM*     105        107        107        103        102        103         87
TSKB#     102         95        100        104        104        104        104
WETT*      70         88         70         49         73         74         73
YAR1*     101        100         60         77         91         99        104
YELL*#    105        101        100        105         97        105         84
_______________________
*Indicates fiducial site; #indicates TurboRogue psuedo-range used
END GROUND STATION INCLUSION TABLE

As described in IGS Report No. 634, the table below indicates the repeatability
of clock solutions for all satellites and stations used in this week's analysis:

JPL CLOCK REPEATABILITY TABLE                GPS week 750 (1994 May 22 - May 28)
      94  5 22   94  5 23   94  5 24   94  5 25   94  5 26   94  5 27   94  5 28
comp log10(rms/ps)
PRN01     3.5        3.3        3.2        3.3        3.3        3.3        3.9
PRN02     4          2.7        3          4          4.3        3.0        3  
PRN04     3.2        3.2        2.8        3.3        3.9        2.8        3.8
PRN05     3.8        3.3        3.0        3.2        3.1        3.1        3.8
PRN06     3.5        3.3        3.1        3.1        3.1        3.2        4.2
PRN07     4.4        3.4        2.7        2.7        3.2        3.4        3.5
PRN09     4.3        3.7        3.4        3.3        3.3        3.4        3.9
PRN12     4.4        3.8        3.4        2.9        3.4        3.1        3.7
PRN14     3.9        4.1        3.9        3.6        3.2        3.5        3.6
PRN15     3.7        4.1        4          3.5        3.0        3.4        4.1
PRN16     3.7        3.2        2.7        2.4        2.7        2.5        4.0
PRN17     3.3        3.5        3.2        3.0        3.0        3.4        4.8
PRN18     3.9        3.1        3.1        3.3        3.0        3.1        3.4
PRN19     3.7        3.3        3.3        3.1        3.1        3.6        3.2
PRN20     3.8        3.1        2.9        5.2        5.9        3.3        3.8
PRN21     3.9        3.9        3.1        2.8        3.0        2.9        4.5
PRN22     4.1        2.8        3.4        2.8        3.1        3.1        4.3
PRN23     4.0        3.4        3.1        3.5        2.8        3.4        4.8
PRN24     4.2        3.3        3.1        3.2        3.0        2.9        3.5
PRN25     3.8        3.9        3.4        3.2        3.4        3.4        3.3
PRN26     3.9        3.2        3.0        3.0        3.0        3.2        4.4
PRN27     3.8        3.1        3.7        3.1        3.1        3.0        3.1
PRN28     3.9        3.5        3.2        2.9        3.2        3.7        4.8
PRN29     3.8        3.2        3.4        3.0        3.1        2.9        3.3
PRN31     4.1        3.0        3.4        2.9        3.4        3.5        4.8
AREQ      3          3.3        3.0        2.8        2.9        3.0        3.2
CANB      3.9        4          3.6        3.7        3.4        2.9        4.5
FAIR      3.7        3.4        3.8        4.0        4.7        3.6        3.8
FORT      3          2.5        3.0        3.7        5                     3  
GOLD      3.6        3          3.3        3.8        3.3        3.6        3.7
HART      4          3.7        3.8        3.7        4.2        3.4        4.4
HOBA      3.6        3.8        3.1        2.9        2.8        3             
KOKB      3.6        3.5        3.9        4.0        4.8        3.4        3.5
KOSG      3.7        3.1        3.1        3.9        4.7        2.2        2.6
MADR      3.4        4          3.4        4.0        4.8        3.4        3.4
MCMU      3.8        3.9        3.0        2.9        3                     5  
ONSA      3.4        3                                3          2.8        2.9
PAMA      3          3.1        3.8        4.4        5.1        3.5        4.3
SANT      4          3.7        4.1        3.9        4.4        3.7        4.0
TROM      3.9        4.3        4.0        4.0        4.4        3.6        4.0
TSKB      3.4        3.0        3.3        2.9        2.9        3.0        3.2
WETB      3.2        3.7        3.7        4          3.9        3.2        3.6
YAR1      3.8        3.8        3.3        3          3.5        3.7        4.6
YELL      3.1        3.1        2.7        2.3        2.8        3.0        3.2
_______________________
END CLOCK REPEATABILITY TABLE