Subject: [IGSREPORT-184] JPL Analysis Report (week 686)
From: D. Jefferson
Date: 24 MAR 1993 09:10:27

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IGS Electronic Report     24-MAR-1993 09:10:27       Message Number 184
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From:	D. Jefferson	
Subj:	JPL Analysis Report (week 686)
--------------------------------------

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
______________________________________________________________________________
jpl06867.sum           This text file.
jpl06867.erp           Earth rotation parameters for GPS week 686.
jpl0686[0-4].sp1       GPS ephemerides for Sun, Feb 28 through Thu, Mar 4,
                          sp1 format - (w/PRN14).
jpl06865.sp1           GPS ephemerides for Fri, Mar 5, sp1 format - (no PRN14).
jpl06866.sp1           GPS ephemerides for Sat, Mar 6, sp1 format - (w/PRN14).
jpl0686[0-4].sp3       GPS ephemerides for Sun, Feb 28 through Thu, Mar 4,
                          sp3 format - (w/PRN14).
jpl06865.sp3           GPS ephemerides for Fri, Mar 5, sp3 format - (no PRN14).
jpl06866.sp3           GPS ephemerides for Sat, Mar 6, sp3 format - (w/PRN14).
______________________________________________________________________________

We continue to deweight data from PRN11/GPSO8; orbit repeatabilites for this
spacecraft remain at the meter-level. Also, according to the file gpsn1.txt
obtained from tycho.usno.mil, PRN14/GPS14 was scheduled unusable for up to 8
hours on March 5 (day 064), beginning at 14:55 UT (a maneuver). Because of
this, we have chosen to delete this satellite from our analysis of March 5, and
to deweight its data for March 6. Beginning this week, we are including results
for PRN22/GPS22, which was launched February 3 (day 034). As this is a new
satellite, its data have been deweighted for this week's analysis.

As per IGSMESS.209, data from MCMU have been excluded for the entire week of
analysis. Also, information from IGS Message Nos. 212 and 217 have prompted us
to exclude data from FAIR and DRAO respectively for the entire week as well.
However, this week's analysis includes the processing of data from two new
global network stations: NLIB (North Libery, Iowa, USA) and WEST (Haystack
Observatory; Westford, Massachusetts, USA). Keeping in line with our usual
practices, data from these stations were deweighted for week 686. The
following nominal coordinates were assumed, and the station locations were
estimated (unconstrained) each day:

   NLIB:  X = -130928.4000 m,    Y = -4762296.8000 m,    Z = 4226863.1000 m
   WEST:  X = 1492233.0160 m,    Y = -4458088.2540 m,    Z = 4296047.9700 m

According to the file gpstd.txt obtained from tycho.usno.navy.mil, A-S testing
occurred during "27 Feb 2200 UT to 28 Feb 0200 UT" (days 058, 059). All cross-
correlated data were included in our processing. Because of our 30-hour
analysis interval, the following measures were taken for February 28 and March 1
(days 059 and 060) ONLY:
   (1) we only accepted data above 20 degrees elevation (instead of the usual
       15 degrees);
   (2) pseudorange data were greatly deweighted relative to the carrier phase
       (relative weight ratio of 10**-8 instead of the usual 10**-4).

WARNING: Data from PRN11/GPSO8 have been deweighted for the entire GPSweek 686.
WARNING: Due to a the maneuver of PRN14/GPS14, data from this satellite have             been deleted for day 064, and deweighted for day 065.
WARNING: Data from PRN22/GPS22 have been deweighted for the entire GPSweek 686.
WARNING: Data from DRAO, FAIR, and MCMU have been excluded for GPSweek 686.

JPL LODR TABLE                               GPS week 686 (1993 Feb 28 - Mar 06)
  MJD       LODR     +/-
          (ms/day)
 49046.5    2.02     0.08
 49047.5    2.75     0.07
 49048.5    2.37     0.06
 49049.5    2.18     0.06
 49050.5    2.20     0.06
 49051.5    2.32     0.07
 49052.5    2.33     0.07
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 686 (1993 Feb 28 - Mar 06)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS
           ''        ''        sec     ''     ''      sec
 49046.5   .17663   .21495  -.09079  .00026  .00037  .00000  .0  .16  .00  .00  30 22  0
 49047.5   .17620   .21452  -.09351  .00024  .00033  .00000  .0  .16  .00  .00  30 22  0
 49048.5   .17363   .21282  -.09624  .00015  .00018  .00000  .0  .13  .00  .00  31 22  0
 49049.5   .17264   .21145  -.09898  .00015  .00016  .00000  .0  .11  .00  .00  32 22  0
 49050.5   .17143   .21002  -.10173  .00015  .00017  .00000  .0  .10  .00  .00  32 22  0
 49051.5   .16966   .20855  -.10449  .00020  .00023  .00000  .0 -.01  .00  .00  32 21  0
 49052.5   .16832   .20696  -.10725  .00018  .00020  .00000  .0  .04  .00  .00  33 22  0
END UTPM TABLE

The following table indicates the "3-dimensional orbit repeatability", as
defined in IGS Mail Message 37, for GPS week 686:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 686 (1993 Feb 28 - Mar 06)
      93  2 28   93  3  1   93  3  2   93  3  3   93  3  4   93  3  5   93  3  6
prn   3d rss (m)
  1       2.54       0.61       0.57       0.45       0.46       0.41       0.66
  2       2.98       0.59       0.31       0.37       0.77       0.24       0.33
  3       1.88       1.56       0.68       0.27       0.47       0.28       0.41
 11       1.74       1.22       0.69       1.29       2.48       1.47       1.56
 12       8.25       0.56       0.64       0.61       1.51       0.88       0.40
 13       1.37       0.71       0.67       0.48       0.68       0.84       0.84
 14       2.81       1.09       0.48       0.26       0.2     (not used)    6.5
 15       1.34       0.36       0.32       0.50       0.67       0.39       0.45
 16       7.13       1.30       0.26       0.47       0.39       0.15       0.50
 17       5.16       1.76       0.54       0.18       0.32       0.22       1.10
 18       5.97       0.61       0.84       0.45       0.34       0.23       0.83
 19       5.24       0.42       0.22       0.22       0.55       0.34       0.51
 20       6.71       2.10       1.31       0.59       0.49       0.53       0.86
 21       1.57       0.68       0.56       0.61       1.39       0.66       0.60
 22     990.1     1092.10    1540.22      80.22    1397.38    1343.28      35.69
 23       2.83       0.68       0.55       0.41       0.60       0.57       0.97
 24       1.86       0.77       0.54       0.40       0.39       0.53       0.67
 25       4.76       1.95       3.11       0.56       0.73       0.57       0.59
 26       1.99       0.88       0.30       0.26       0.56       0.29       0.38
 27       3.30       0.38       0.24       0.18       0.20       0.31       0.40
 28       0.65       0.27       0.84       0.28       0.86       0.42       0.66
 29       2.52       1.10       1.47       0.64       0.89       0.90       0.77
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  2 28   93  3  1   93  3  2   93  3  3   93  3  4   93  3  5   93  3  6
prn   3d rss (m)
  1      11.4       11.2       11.0       11.5       14.2       11.5       12.2
  2      12.8        7.2        8.2       11.9        7.9        7.4        7.0
  3       7.1        6.09       9.6       11.7        8.7        7.0       10.6
 11       9.4        7.1       10.0       11.8        9.9       12.5       10.9
 12      24.5       21.7       12.8       11.7       29.9       31.2       20.5
 13       4.7        3.7        3.4        2.9        7.6        8.0        3.6
 14      13.3       12.0       12.6       13.0       13.7    (not used)    21.5
 15       3.9        4.8        8.7        4.4        3.9        6.7        7.6
 16       9.9        6.9        7.7        6.7       18.7        5.2        6.6
 17       9.1        7.5        6.8       11.1        7.7        7.5        7.0
 18      11.8       10.1       12.7       10.3       12.3       10.2       13.1
 19       7.5        3.5        6.9        6.7        5.2        3.7        3.9
 20       7.1        6.6        6.6        7.4        8.0        5.8        6.0
 21       8.0        8.6        7.0        5.0        6.4        7.6        8.6
 22    9865.7     6549.1      561.7      271.5      462.8      717.2      824.7
 23      12.3       18.7       13.2        6.8        7.1        5.6        6.2
 24       9.7       10.7       11.3       13.2        9.6        6.5        7.4
 25       8.4       12.1       10.4        8.2        9.3        8.6       10.2
 26       8.9        6.2        4.7        5.4       10.4        6.7        8.5
 27       5.2        5.2        5.0        5.2        4.9        8.8        5.7
 28       8.0        9.7        4.6       10.1        7.1        6.4        4.9
 29      13.9       15.4       16.6       17.6       13.1       16.7       17.7
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 686 (1993 Feb 28 - Mar 06)
      93  2 28   93  3  1   93  3  2   93  3  3   93  3  4   93  3  5   93  3  6
site    % data
ALBH       91         92        103        102        102         87         98
ALGO*      89         90        101         89         99         86         95
GOLD       85         91         87         89         90         82         93
GRAZ       16         81        101        101         92         47         56
HART*      91         92        104        104        104         88         92
HERS       88         90        103        104        103         89         93
JPLM       91         92        105        105        106         91        101
KOKB*      91         94        107        107        107         91         98
KOSG       88         90        104        105        104         91         99
KOUR       87         89        111        107        105         86         96
MADR*      82         59         98         99        100         63         91
MASP       84         87         99        100        100         84         91
MATE        8         78         98         99         99         77         84
METS       87         91        102        100        102         90         90
NLIB        0          0          0          5         12         71         82
NYAL        0         77        119        120        111          0         28
ONSA       82         76         91         93         95         86         84
PAMA       89         87         95         98         99         84         91
PIE1       93         94        104        103        100         83         89
QUIN       65          0          0          0          0         19         88
RCM2       77         92        105        105         87         29         85
SANT*      94         96        108        108        106         89         99
STJO       86         88        102        102         99         81         92
TAIW       93         94        108        107        103         74         83
TIDB       90         92        103        101        101         89         97
TROM*      97         99        112        111        102         60        104
USUD       88         90        106        106        106         88         96
WEST       88         88         98        100        100         86         96
WETT       88         89        102        102        102         88         96
YAR1*       0          0         63        107        109         93        102
YELL       92         94        107        106        107         92        103
_______________________
*Indicates fiducial site.
END GROUND STATION INCLUSION TABLE