Subject: [IGSREPORT-292] JPL Analysis Report (week 693)
From: G. Blewitt
Date: 25 MAY 1993 09:34:12

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IGS Electronic Report     25-MAY-1993 09:34:12       Message Number 292
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From: G. Blewitt
Subj: JPL Analysis Report (week 693)
------------------------------------

Submitted by

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]):

______________________________________________________________________________
filename               contents
______________________________________________________________________________
jpl06937.sum           This text file.
jpl06937.erp           Earth rotation parameters for GPS week 693.
jpl06937.sp1           GPS ephemerides for GPS week 693, sp1 format.
jpl06937.sp3            "       "       "   "   "    " , sp3   "   .
______________________________________________________________________________

We continue to deweight data from PRN22/GPS22. Beginning this week, we have
included data from the new satellite PRN31/GPS31, launched March 30, 1993.
Following our usual practices, we have deweighted data from this satellite
for the entire week of analysis. Also, according to the file gpsn2.txt
obtained from tycho.usno.navy.mil, PRN01/GPS32 was unusable from 09:27 to 19:21
UT on day 112 (April 22). Because of this, we found it necessary to deweight
data from this satellite for days 112 AND 113.

As reported in gpstd.txt, also obtained from tycho.usno.navy.mil, "A-S testing
occurred during the period 19 Apr 0000 UT to 24 Apr 0000 UT". Days 109 through
114 included all cross-correlated data, and were analyzed using our AS
processing strategy (see jpl06867.sum). AS has adversely affected our GPS orbit
repeatabilites, causing them to be an order of magnitude or so larger than
normal.

Due to the atypically small amount of data available from ALGO on day 113
(April 23), we have changed our reference clock to FAIR (Fairbanks, Alaska)
for that day ONLY.

WARNING: Due to the maneuver of PRN01/GPS32, data from this satellite have
         been deweighted for days 112 and 113 (April 22 and 23).
WARNING: Data from PRN22/GPS22 have been deweighted for the entire GPSweek 692.
WARNING: Data from PRN31/GPS31 have been deweighted for the entire GPSweek 692.
WARNING: FAIR (instead of ALGO) was used as the reference clock for day 113.

JPL LODR TABLE                               GPS week 693 (1993 Apr 18 - Apr 24)
  MJD       LODR     +/-
          (ms/day)
 49095.5    2.97     0.06
 49096.5    3.62     0.06
 49097.5    3.69     0.06
 49098.5    2.70     0.06
 49099.5    2.90     0.06
 49100.5    3.14     0.06
 49101.5    2.49     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 693 (1993 Apr 18 - Apr 24)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS    
           ''        ''        sec     ''     ''      sec
 49095.5   .06969   .16437  -.22392  .00018  .00023  .00000  .0  .04  .00  .00  32 23  0
 49096.5   .06732   .16552  -.22658  .00020  .00021  .00000  .0 -.06  .00  .00  33 23  0
 49097.5   .06361   .16367  -.22923  .00020  .00021  .00000  .0 -.08  .00  .00  37 23  0
 49098.5   .06074   .16450  -.23187  .00019  .00021  .00000  .0 -.06  .00  .00  37 23  0
 49099.5   .06355   .16613  -.23449  .00020  .00021  .00000  .0 -.08  .00  .00  38 23  0
 49100.5   .05813   .15824  -.23710  .00021  .00023  .00000  .0 -.07  .00  .00  37 23  0
 49101.5   .05424   .16376  -.23971  .00020  .00020  .00000  .0 -.09  .00  .00  34 23  0
END UTPM TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 693:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 693 (1993 Apr 18 - Apr 24)
      93  4 18   93  4 19   93  4 20   93  4 21   93  4 22   93  4 23   93  4 24
prn   3d rss (m)
  1       1.49       3.90       5.65    2723.49   #3384.32   #4051.88       9.34
  2       0.84       2.48       2.35       2.24       1.64       2.44       3.50
  3       1.40       4.32       4.61       2.67       3.67       3.32       2.52
 11       1.34       2.04       2.66       2.07       1.16       1.48       2.48
 12       1.83       1.70       2.08       2.04       2.18       4.21       2.48
 13       1.22       1.40       1.94       1.60       1.72       1.03       1.74
 14       4.22       4.34       3.04       5.26       5.64       3.65       2.65
 15       1.80       2.82       6.08       2.85       4.86       3.52       2.31
 16       2.75       2.54       3.56       2.93       5.96       7.19       3.41
 17       3.53       7.88       8.92      11.26       4.23       8.20       7.26
 18       0.91       2.21       2.92       3.88       5.01       3.07       1.77
 19       1.68       4.83       4.98       5.14       5.94       2.93       4.72
 20       1.47       1.76       4.96       6.15       6.54       3.31       2.83
 21       0.78       5.46       5.05       4.99       2.55       3.55       7.78
 22      #6.2       #2.28      #2.79      #3.81      #2.28      #4.77      #9.48
 23       1.50       1.49       5.71       5.48       2.03       6.94       5.91
 24       1.42       1.70       1.94       5.62       5.20       3.41       2.19
 25       1.53       2.71       4.44       7.57       6.87       3.85       1.02
 26       1.02       1.64       2.90       3.51       4.36       5.47       3.28
 27       2.17       1.97       2.34       4.34       1.66       3.34       3.33
 28       1.17       2.26       2.56       2.74       4.85       4.96       4.07
 29       2.66       1.86       1.74       4.66       5.39       3.12       1.30
 31     #61.3      #30.03     #39.82      #8.71     #16.38     #31.21      #8.52
_______________________
#Indicates deweighted satellite.
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
      93  4 18   93  4 19   93  4 20   93  4 21   93  4 22   93  4 23   93  4 24
prn   3d rss (m)
  1      13.6       17.3       29.6    74530.6    #3156.4      #13.8        7.3 
  2       3.2        3.4        5.1        6.5        5.5        2.6        3.2 
  3      12.6       11.8       11.3       10.2       10.4        9.8       13.2 
 11       5.6        6.0        6.1        6.3        4.5        6.7        6.2 
 12       6.4        5.2        7.2        5.0        4.9        7.2        2.9 
 13       4.1        4.8        7.7        5.4        7.6        8.3        3.5 
 14       4.8        3.9        5.8       10.2        3.9        5.1        7.3 
 15       4.1        4.4        9.2        9.4        6.3        5.5        5.8 
 16       5.4        6.1        3.8        5.9        4.9        4.8        5.7 
 17       8.9       11.9        9.0        8.7        9.4        9.4       11.7 
 18       9.7       17.0        9.6       10.9       11.7       13.2       13.7 
 19       4.7        3.0        5.7        3.1        7.3        5.3        4.5 
 20      11.5       12.0       11.4        6.3        6.3       10.1        8.0 
 21       5.4        3.9        5.9        5.1        5.2        3.6        5.2 
 22      #2.1       #3.0       #2.5       #2.6       #2.1       #1.9       #2.7 
 23       7.9        3.4        4.0        6.1        7.8       10.7        6.4 
 24       7.5        7.3        6.8        6.1        7.2       10.4        7.1 
 25       8.9        9.9       11.2       10.3        8.3        8.8        7.4 
 26       7.1        9.7        9.4        6.6        5.7        5.8        5.2 
 27       5.6        6.5        3.8        5.5        4.8        5.4        3.8 
 28       5.0        6.0        7.9        8.5        8.1        6.5        5.5 
 29      10.5       13.2       12.9       10.6        6.0       11.8       12.4 
 31      #6.3      #31.5      #17.5       #2.6      #10.1       #7.2       #4.0 
_______________________
#Indicates deweighted satellite.
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

The following table, as explained in IGS Report No. 99, indicates the amount
of data from each tracking site used in this week's analysis:

JPL GROUND STATION INCLUSION TABLE           GPS week 693 (1993 Apr 18 - Apr 24)
      93  4 18   93  4 19   93  4 20   93  4 21   93  4 22   93  4 23   93  4 24
site    % data
ALBH       99         89         90         87         85         82         90
ALGO*      84         88         93         95         92         48         90
DRAO      102         92         93         91         88         89         94
FAIR*      96         91         92         92         88         88         92
GOLD       94         90         86         83         78         70         76
GRAZ      100         97         95         97         90         90         98
HART*      99         95         94         94         88         85         90
HERS        0          0         83         90         85         84         61
HOBA        0          0         63         82         76         58          0
JPLM       66         53         81         33          0         22         23
KOKB*      99         93         90         92         92         91         95
KOSG      102         90         95         94         91         90         97
KOUR       99         93         92         93         88         88         94
MADR*     100         93         91         92         72         63         74
MASP       98         95         91         92         91         93         95
MATE        0          0         72         84         76         83         92
MCMU        0         98        109        107        105        102        108
METS       96         95         92         93         85         76          0
NLIB       60         79         75         75         77         53         85
NYAL      108        102        101        100         55          0          0
ONSA      105         98         96         98         93         87         93
PAMA       95         91         87         88         86         85         93
PIE1      101         92         95         95         91         89         96
QUIN      102         93         91         86         85         85         90
RCM2      101         84         83         86         87         82         22
SANT*     102         99         99         99         95         90         97
STJO      103         90         90         93         88         84         93
TAIW        0         83         93         94         87         84         93
TIDB       91         94         82         92         87         86         99
TROM*      87         68        103        102         96         98        105
USUD       32          0          0          0         66         85         95
VNDP       96         84         91         91         82         86         92
WEST      103         92         91         93         81          0          0
WETT        0          0         46         50         54         68         84
YAR1*      86         96         92         82         86         91         60
YELL      107         91         92         87         76         90         96
_______________________
*Indicates fiducial site; #indicates deweighted site.
END GROUND STATION INCLUSION TABLE