Subject: [IGSREPORT-142] JPL Analysis Report (week 681)
From: David C Jefferson
Date: 16 FEB 1993 00:00:00

From:     David C Jefferson
Subject:  JPL Analysis Report (week 681)
----------------------------------------

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
______________________________________________________________________________
jpl06817.sum           This text file.
jpl06817.erp           Earth rotation parameters for GPS week 681.
jpl06817.sp1           GPS ephemerides for GPS week 681, sp1 format.
jpl06817.sp3            "       "       "   "   "    " , sp3   "   .
______________________________________________________________________________

We continue to deweight data from PRN11/GPS08; daily repeatabilites for this
satellite remain at the meter level. Data from PRN29/GPS29 have also been
deweighted for this week's analysis. However, our orbit repeatability table
indicates that this satellite is now well-modelled. We will discontinue 
deweighting data from this satellite in subsequent analyses. Furthermore,
what was PRN32 changed to PRN01 on January 28. Our files and tables for this
submission refer to this satellite as PRN32 for the entire week. For the next
submission (GPS week 682) we will refer to it as PRN01.

Two stations were deliberately removed from our analyses this week due
to anomalous data which caused post-fit residuals of phase and
pseudorange measurements to be hundreds of meters or greater. The
relevant sites and dates are:

      DRAO (Penticton, B.C., Canada)  - January 24 and 29 (days 024,029)
      MCMU (McMurdo Bay, Antarctica)  - January 29 and 30 (days 029,030)

Also, we now include data from VNDP (Vandenberg Air Force Base). Data
from this site have been deweighted for this week. The following
nominal coordinates were assumed, and the station location was estimated
(unconstrained) each day:

      X = -2678071.2358 m,    Y = -4525457.5680 m,    Z = 3597434.3456 m
 
WARNING: Data from PRN's 11 and 29 (GPS08 and GPS29) have been deweighted for            week 681.

JPL LODR TABLE                               GPS week 681 (1993 Jan 24 - Jan 30)
  MJD       LODR     +/-
          (ms/day)
 49011.5    2.53     0.05
 49012.5    2.24     0.05
 49013.5    2.60     0.05
 49014.5    2.73     0.05
 49015.5    2.71     0.05
 49016.5    2.70     0.05
 49017.5    2.79     0.05
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 681 (1993 Jan 24 - Jan 30)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS    
           ''        ''        sec     ''     ''      sec
 49011.5   .21286   .29655   .00289  .00013  .00014  .00000  .0  .06  .00  .00  33 21  0
 49012.5   .21036   .29428   .00044  .00015  .00017  .00000  .0 -.01  .00  .00  34 21  0
 49013.5   .21260   .29282  -.00200  .00013  .00015  .00000  .0  .07  .00  .00  34 21  0
 49014.5   .21207   .29086  -.00445  .00014  .00015  .00000  .0  .09  .00  .00  33 21  0
 49015.5   .21166   .28855  -.00690  .00014  .00016  .00000  .0  .09  .00  .00  34 21  0
 49016.5   .21106   .28600  -.00935  .00014  .00016  .00000  .0  .09  .00  .00  32 21  0
 49017.5   .20984   .28373  -.01180  .00014  .00017  .00000  .0  .08  .00  .00  32 21  0
END UTPM TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 681:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 681 (1993 Jan 24 - Jan 30)
      93  1 24   93  1 25   93  1 26   93  1 27   93  1 28   93  1 29   93  1 30
prn   3d rss (m)
  2       1.54       0.70       0.27       0.40       0.34       0.17       0.35
  3       2.03       1.05       0.45       0.24       0.87       1.30       0.24
 11       1.64       0.93       0.97       1.15       1.41       1.18       2.07
 12       0.91       0.68       0.50       0.77       0.59       0.52       0.72
 13       2.16       0.79       0.56       0.60       0.74       0.49       0.44
 14       0.93       0.34       0.67       0.36       0.58       0.45       0.34
 15       0.80       0.53       0.34       0.20       0.24       0.29       0.22
 16       1.49       0.95       0.33       0.33       0.21       0.34       0.25
 17       0.99       0.75       0.55       0.22       0.33       0.53       0.36
 18       0.45       0.40       0.15       0.15       0.26       0.26       0.31
 19       0.64       0.58       0.32       0.19       0.20       0.13       0.17
 20       6.83       0.97       0.49       0.34       0.34       0.89       0.32
 21       0.47       0.42       0.25       0.14       0.25       0.23       0.23
 23       0.34       0.35       0.56       0.24       0.29       0.37       0.25
 24       1.58       0.63       0.46       0.70       0.65       0.27       0.40
 25       1.63       0.68       0.47       0.38       0.45       0.35       0.45
 26       0.56       0.76       0.65       0.28       0.66       0.50       0.39
 27       1.04       0.57       0.40       0.17       0.23       0.10       0.23
 28       0.86       0.66       0.31       0.26       0.21       0.17       0.20
 29       0.50       0.96       0.45       0.93       0.54       0.66       0.72
 32       0.88       0.84       0.73       0.45       0.65       1.29       0.54
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  1 24   93  1 25   93  1 26   93  1 27   93  1 28   93  1 29   93  1 30
prn   3d rss (m)
  2       4.7        4.0        4.2        4.1        4.9        5.7        6.1 
  3       8.7        8.7        9.0        8.6        7.6        7.4        7.2 
 11       8.8        9.9        9.52      15.6       15.7       12.3       14.3 
 12      14.7        8.1        9.6       10.6        5.6        9.8       11.5 
 13       3.0        4.0        6.5        6.2        5.5        1.7        6.6 
 14       7.3        8.2        5.1        7.1        6.7        6.5        5.1 
 15       8.0        9.4        5.9        7.3        6.9       11.3        9.3 
 16       3.9        3.7        3.8        5.7        4.4        5.6        4.9 
 17       6.7        6.2        5.6        5.7       10.8        9.3        8.9 
 18       3.5        8.7        6.1        5.1       11.2       13.6        8.0 
 19       3.6        3.6        3.7        4.1        6.5        5.7        5.0 
 20       6.6        7.0        6.7        7.6       10.3        6.7        9.2 
 21       8.6        4.6        2.5        5.9        2.4        7.8        6.5 
 23       5.9        5.4        4.8        5.7        5.0        5.5        6.7 
 24      11.9       13.0       12.9       14.9       11.6       16.1       18.4 
 25       5.8        4.8        5.7        4.6        5.4        5.2        6.3 
 26       2.7        2.3        2.3        4.3        6.0        4.7        5.1 
 27      14.8       13.0       10.5       12.1       11.0       14.9       16.8 
 28       4.8        8.3        9.0       23.2       12.5        5.0        4.6 
 29      26.4       24.6       23.9       22.3       17.6       17.6       16.9 
 32       6.1        5.7        5.7        6.6        4.5        4.4        4.3 
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 681 (1993 Jan 24 - Jan 30)
      93  1 24   93  1 25   93  1 26   93  1 27   93  1 28   93  1 29   93  1 30
site    % data
ALBH       96         87         95         96         96         96         96
ALGO*      95         87         96         97         97         97         97
DRAO                  90         98         71         51                    95
FAIR*      76         71        102         98         89        102        102
GOLD       75         52         81         76         63         89         90
GRAZ       46         88         98         99         58         88         98
HART*     103         90        103        103        102        101         77
HARV       97         88         95         93         83         84         96
JPLM       98         90         78         89         97         97         94
KOKB*      96         80        104        104        100        104         96
KOSG      101         91        100        100        100        100        100
KOUR       90         89         98         97         94         95         95
MADR*      92         83         90         92         93         93         92
MASP       99         90         99         99         98         97         98
MATE       89         78         85         91         91         43         90
MCMU      102         55         10
METS       92         91         99        102        102        102         99
NYAL                  43        106        110        114         86
ONSA       96         88        100         90         90         74         85
PAMA       97         86         96         96         96         95         95
PIE1       92         85         93         93         94         95         86
QUIN       93         82         90         88         87         82         97
RCM2        0                                          42         83         56
SANT*      99         89         97         99         98         99        100
STJO       99         89         98         98         98         98         99
TAIW      101         90        100        100         92         91        101
TIDB       92         82         90         93         91         95         95
TROM*      99        101        112        114        114        111        108
USUD       86         75         85         86         93         88         97
VNDP        0         29         30         32         31         27         27
WETT       94         85         96         85         69         91         94
YAR1*      99         91        102        102        102        101        101
YELL      102         93        103        104        104        105        105
_______________________
*Indicates fiducial site.
END GROUND STATION INCLUSION TABLE