Subject: [IGSREPORT-177] JPL Analysis Report (week 0685)
From: David C Jefferson
Date: 19 MAR 1993 10:06:16

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IGS Electronic Report     19-MAR-1993 10:06:16       Message Number 177
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From: David C Jefferson
Subj: JPL Analysis Report (week 0685)
-------------------------------------

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
______________________________________________________________________________
jpl06857.sum           This text file.
jpl06857.erp           Earth rotation parameters for GPS week 685.
jpl06857.sp1           GPS ephemerides for GPS week 685, sp1 format.
jpl06857.sp3            "       "       "   "   "    " , sp3   "   .
______________________________________________________________________________

As in previous weeks, data from PRN11/GPSO8 have been deweighted; orbit
repeatabilites remain at the meter-level. Also, data from PRN03/GPS11 and
PRN14/GPS14 were deweighted for February 21 (day 052) only. As per IGSMESS.209,
data from MCMU have not been included for the entire week of analysis. Orbit
overlap statistics for February 27 (day 058) were derived using only the
previous day, hence the 3d-rss is only quoted to 1 decimal place.

According to the file gpstd.txt obtained from tycho.usno.navy.mil, A-S testing
occured during the following periods for week 685:
              "20 Feb 1700 UT to 21 Feb 0200 UT" (days 051, 052)
              "26 Feb 1200 UT to 26 Feb 2200 UT" (day 057)
              "27 Feb 2200 UT to 28 Feb 0200 UT" (days 058, 059)
All cross-correlated data were included in our processing, and the following
measures were taken for AS days only (see jpl06847.sum also):
   (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).
(However, unlike week 684, data from the TurboRogue receivers at HARV, PIE1,
QUIN, and VNDP were NOT deliberately excluded.)

WARNING: Data from PRN11/GPSO8 have been deweighted for the entire GPS week 685.
WARNING: Data from PRN03/GPS11 and PRN14/GPS14 have been deweighted for day 052.
WARNING: The measurement of LODR for February 27 (day 058) appears to be an              outlier, although we are unable to discern exactly why. There is no             evidence that clock instability is the cause.

JPL LODR TABLE                               GPS week 685 (1993 Feb 21 - Feb 27)
  MJD       LODR     +/-
          (ms/day)
 49039.5    2.38     0.08
 49040.5    2.78     0.06
 49041.5    2.61     0.06
 49042.5    2.61     0.07
 49043.5    2.82     0.07
 49044.5    2.45     0.07
 49045.5    3.85     0.08
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 685 (1993 Feb 21 - Feb 27)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS
           ''        ''        sec     ''     ''      sec
 49039.5   .19404   .23080  -.07161  .00029  .00039  .00000  .0  .03  .00  .00  31 21  0
 49040.5   .19117   .22903  -.07435  .00018  .00023  .00000  .0  .10  .00  .00  30 21  0
 49041.5   .18816   .22729  -.07710  .00018  .00023  .00000  .0  .12  .00  .00  29 21  0
 49042.5   .18570   .22519  -.07985  .00018  .00025  .00000  .0  .17  .00  .00  29 21  0
 49043.5   .18353   .22254  -.08260  .00019  .00025  .00000  .0  .19  .00  .00  28 21  0
 49044.5   .18079   .22383  -.08534  .00027  .00039  .00000  .0  .20  .00  .00  30 21  0
 49045.5   .18191   .21908  -.08806  .00026  .00038  .00000  .0  .17  .00  .00  29 21  0
END UTPM TABLE

The following table indicates the "3-dimensional orbit repeatability", as
defined in IGS Mail Message 37, for GPS week 685:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 685 (1993 Feb 21 - Feb 27)
      93  2 21   93  2 22   93  2 23   93  2 24   93  2 25   93  2 26   93  2 27
prn   3d rss (m)
  1       2.30       1.54       0.69       0.52       0.53       1.99       3.8
  2       1.75       0.70       0.26       0.23       1.40       3.10       1.4
  3       8.67       1.90       1.00       0.63       0.56       1.11       1.8
 11       2.41       1.50       0.68       1.69       1.94       2.40       5.3
 12       1.72       1.29       0.37       0.37       1.15       1.35       0.8
 13       4.98       1.04       0.57       0.59       1.26       1.91       0.3
 14       3.70       0.99       0.71       0.51       0.63       3.98       0.7
 15       1.71       0.38       0.32       0.32       1.00       1.43       2.5
 16       4.34       0.93       0.35       0.42       1.20       2.03       3.3
 17       2.76       2.36       0.78       0.30       0.65       4.09       5.9
 18       1.25       0.57       0.22       0.23       0.69       0.52       2.2
 19       4.51       0.23       0.28       0.36       0.61       0.77       1.6
 20       5.74       0.94       1.14       1.24       1.08       1.01       0.9
 21       2.05       0.88       0.77       0.60       0.40       2.86       1.6
 23       1.83       0.97       0.73       0.88       0.54       1.88       1.0
 24       3.31       0.66       0.52       0.33       3.38       3.03       2.0
 25       3.36       2.56       0.27       0.62       3.05       4.91      15.3
 26       0.77       0.50       0.20       0.27       0.72       2.98       3.0
 27       0.52       0.26       0.21       0.39       0.75       0.96       0.9
 28       2.57       0.61       0.40       0.40       0.48       1.36       0.6
 29       2.84       1.25       0.86       1.01       1.16       0.92       1.3
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 21   93  2 22   93  2 23   93  2 24   93  2 25   93  2 26   93  2 27
prn   3d rss (m)
  1       8.0        7.8        8.7        8.2        8.4        6.9        9.1
  2       8.9        9.6        9.0        9.4       11.4       11.0       16.7
  3       8.7       10.3        8.0        9.6        8.5        8.4        6.06
 11      10.5        4.8       12.2       10.2        5.6        8.2        8.0
 12       6.5        5.4        7.6        6.7       23.5        5.7       12.4
 13       5.3        4.1        2.8        5.7        5.9        2.5        6.3
 14      11.5       10.4        9.5        8.0       11.0       11.0       11.2
 15       9.5        8.9        2.8        5.1       10.2        5.7        2.8
 16       5.2        6.7        6.0        4.2        6.5        4.6        6.2
 17       4.7        4.8        4.7        6.2        9.9       12.3        9.9
 18       8.5        7.4        8.0        6.0       11.2        7.6        9.3
 19       7.1        7.2        4.2        3.8        7.0        7.3        5.0
 20      12.2        9.9        8.2        7.5        5.7        7.0        8.0
 21       5.3        4.2        3.8        5.8        8.4       10.3        5.1
 23       5.8        2.9        4.3       10.2       15.5       20.0       17.3
 24      10.7       11.2       10.1        9.4        7.5        8.0       10.9
 25       6.2        6.3        6.2        6.5        7.8        8.4        7.4
 26       4.5        5.6        5.2        4.8        4.4        4.0        4.7
 27       6.6        6.7        6.5        9.9        7.7        7.3        5.7
 28       3.2        2.2        5.0        3.8        5.8        6.7        5.8
 29      20.4       20.2       13.8       13.3       21.8       19.7       16.8
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 685 (1993 Feb 21 - Feb 27)
      93  2 21   93  2 22   93  2 23   93  2 24   93  2 25   93  2 26   93  2 27
site    % data
ALBH       83        104        103        103        102         90         90
ALGO*      72        102        102        102        101         85         82
DRAO       86          0          0        102         98         92          0
FAIR*      80         99         98          0          0          0          0
GOLD       82        101        101         99         98         87         76
GRAZ       80        102        102        102        102         88         79
HART*      82        104        104        104        104         92         91
HERS       79         93         19         95        104         88         87
JPLM       86        107        106        106        106         92         91
KOKB*      80        106        106        107        107         93         92
KOSG       74        104        104        104        100         87         86
KOUR       80        108        105        102        101         88         88
MADR*      71         48         64         99        100         83         72
MASP       78        103        102        100         98         84         82
MATE       80         99         21          0          0         37          7
METS       81        105        104        104        105         88         87
NYAL        0          0         28          0          0          0          0
ONSA       49         88        105        100         98         84         82
PAMA       80         99         97         97         97         87         88
PIE1       81        102         98         94         97         70         92
QUIN        0          0          0         16         74         13         70
RCM2       87        104        104        106        105         93         73
SANT*      84        108        107        106        108         95         94
STJO       79        102        102        101        100         87         86
TAIW       82        106        107         95         88         92         92
TIDB       82         79         87        100        100         90         91
TROM*      88        117         63          0          0         30         98
USUD       81        103        104        106        105         92         91
VNDP       10          0          0          0          0          0          0
WETT       80        103        103        103        102         89         88
YELL       85        109        109        108        110         94         91
_______________________
*Indicates fiducial site.
END GROUND STATION INCLUSION TABLE