Subject: [IGSREPORT-202] JPL Comparisons
From: David C Jefferson
Date: 6 APR 1993 08:39:35

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IGS Electronic Report      6-APR-1993 08:39:35       Message Number 202
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From: David C Jefferson 
Subj: JPL Comparisons
-----------------------

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
______________________________________________________________________________
jpl06877.sum           This text file.
jpl06877.erp           Earth rotation parameters for GPS week 687.
jpl06877.sp1           GPS ephemerides for GPS week 687, sp1 format.
jpl06877.sp3            "       "       "   "   "    " , sp3   "   .
______________________________________________________________________________

______________________________________________________________________________

We continue to deweight data from PRN11/GPSO8; orbit repeatabilites for this
spacecraft remain at the meter-level. Except for March 8 and March 9, data from
PRN22/GPS22 have again been deweighted, as it is a relatively new satellite.
On days when PRN22 is poorly modelled, as measured by orbit repeatability, LODR values get skewed. On days when this satellite is well modelled (like March 8th
and 9th), LODR has a reasonable estimate.

Data from MCMU and FAIR have been excluded for the entire week of analysis
in accordance with IGS Message Nos. 209 and 212. Also, we have excluded
data from DRAO for all days except March 13 (day 72), as a replacement clock
has been installed at that site (see IGSMESS.217). As in last week's analysis,
we have again deweighted data from the new site NLIB.

WARNING: Data from PRN11/GPSO8 have been deweighted for the entire GPSweek 687.
WARNING: Data from PRN22/GPS22 have been deweighted for all days EXCEPT days             067 and 068 (March 8 and 9).
WARNING: Data from FAIR and MCMU have been excluded for the entire GPSweek 687.
WARNING: Data from DRAO have been excluded for all days EXCEPT day 072 (Mar 13).

JPL LODR TABLE                               GPS week 687 (1993 Mar 07 - Mar 13)
  MJD       LODR     +/-
          (ms/day)
 49053.5    2.58     0.06
 49054.5    2.70     0.06
 49055.5    2.17     0.06
 49056.5    2.70     0.06
 49057.5    2.47     0.06
 49058.5    2.71     0.06
 49059.5    2.76     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 687 (1993 Mar 07 - Mar 13)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS
           ''        ''        sec     ''     ''      sec
 49053.5   .16715   .20586  -.11001  .00017  .00020  .00000  .0  .07  .00  .00  33 22  0
 49054.5   .16546   .20370  -.11277  .00015  .00017  .00000  .0  .09  .00  .00  33 22  0
 49055.5   .16421   .20167  -.11554  .00015  .00017  .00000  .0  .10  .00  .00  33 22  0
 49056.5   .16384   .20027  -.11831  .00016  .00018  .00000  .0  .11  .00  .00  32 22  0
 49057.5   .16360   .19886  -.12108  .00017  .00019  .00000  .0  .08  .00  .00  33 22  0
 49058.5   .16310   .19716  -.12385  .00016  .00019  .00000  .0  .11  .00  .00  33 22  0
 49059.5   .16216   .19604  -.12663  .00016  .00018  .00000  .0  .10  .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 687:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 687 (1993 Mar 07 - Mar 13)
      93  3  7   93  3  8   93  3  9   93  3 10   93  3 11   93  3 12   93  3 13
prn   3d rss (m)
  1       0.94       0.41       0.63       0.64       0.27       0.29       0.43
  2       0.29       0.33       0.36       0.27       0.33       0.46       0.34
  3       0.27       0.33       0.41       0.29       0.38       0.48       0.31
 11      #0.94      #0.97      #2.47      #2.13      #2.27      #1.21      #1.67
 12       0.37       0.42       0.35       0.53       0.46       0.27       0.37
 13       0.27       0.28       0.45       0.58       0.92       0.49       0.33
 14       8.77       0.29       0.49       0.47       0.50       0.34       0.54
 15       0.15       0.11       0.33       0.28       0.20       0.28       0.30
 16       0.34       0.34       0.66       0.29       0.22       0.32       0.32
 17       0.29       0.48       0.24       0.24       0.28       0.24       0.11
 18       0.39       0.37       0.74       0.42       0.43       0.44       0.46
 19       0.25       0.26       0.28       0.20       0.26       0.50       0.24
 20       0.80       0.49       0.39       0.28       0.44       0.55       0.54
 21       0.60       0.45       0.42       0.42       0.44       0.47       0.42
 22     #90.71      60.36      32.09     #56.26     #83.22     #48.34     #38.31
 23       0.77       0.68       0.83       0.81       0.91       0.89       0.33
 24       0.55       0.32       0.41       0.34       0.33       0.45       0.35
 25       0.33       0.35       0.58       0.73       0.68       0.28       0.30
 26       0.34       0.23       0.21       0.34       0.21       0.32       0.17
 27       0.28       0.28       0.36       0.29       0.49       0.52       0.27
 28       0.22       0.28       0.40       0.17       0.30       0.26       0.22
 29       0.36       0.53       0.84       0.68       0.67       0.73       0.81
_______________________
#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  3  7   93  3  8   93  3  9   93  3 10   93  3 11   93  3 12   93  3 13
prn   3d rss (m)
  1      12.3       11.3       11.6       11.5       10.1       11.0       10.7
  2       6.3        5.6        4.6        5.4        5.2        9.8        6.2
  3       8.3        8.8        9.3        7.1        7.8        4.6        5.8
 11      #9.1       #5.1      #11.9      #18.97      #7.2       #4.8       #7.9
 12      11.8        7.5        5.7       16.8       14.2       10.4       25.9
 13       2.1        2.6        3.2        4.1        5.2        4.5        3.7
 14      10.2       12.9       15.8       14.0        7.3        7.3       10.7
 15       5.2        7.8        7.0       13.9        4.0        4.3        3.1
 16       6.0        4.1        6.2        5.7        5.3        4.1        5.0
 17       4.0        2.9        4.6       10.9       12.5        3.5        4.9
 18       8.5        8.1        8.3       11.9       10.4       10.3       10.4
 19       5.3        3.9        4.1        8.0        3.5        3.2        4.2
 20       7.7        5.5        6.1        5.9        5.5        5.1        4.6
 21      11.6       14.7       11.2       11.2        8.3        9.5       11.7
 22    #660.7      731.5      665.0     #720.4     #178.2     #141.7     #103.6
 23      12.6       21.4       16.6       24.6       27.1       13.2       13.9
 24       8.0        6.2        8.5        9.3        5.8        3.2        3.5
 25       8.0        8.7        7.7        7.2        5.6        4.1       10.6
 26       6.0        5.6        4.8        7.9        5.8        4.5        4.7
 27       7.4        6.2        6.7        5.8        4.6        4.0        3.3
 28      10.5        5.6       10.0        6.9       11.0        3.4        5.9
 29      14.4       15.8       13.2       14.0        9.8        9.7       13.5
_______________________
#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 687 (1993 Mar 07 - Mar 13)
      93  3  7   93  3  8   93  3  9   93  3 10   93  3 11   93  3 12   93  3 13
site    % data
ALBH      101        102        102        101        100        101        101
ALGO*     100        102        105         90         96        102        102
DRAO        0          0          0          0          0          0        103
GOLD       95         96         98         94         30         66         86
GRAZ       92        107        107        101        102        101        101
HART*      99        111        110        103        103        103        104
HERS      104        106        105         99        100        103        100
JPLM      103        107         78          0         35        103        105
KOKB*     104        107        107        104        106        106        106
KOSG      103        110        108        104        105        103        105
KOUR      105        112        112        109        109        112        111
MADR*     100        108        105         99         33         63         83
MASP       93         94         95         94         95         95         96
MATE       98         92         89         98         99         98         99
METS       80         65        110        105        106        105        106
NLIB      #10         #8        #38       #102       #100        #99        #99
NYAL      113        125        123        120        119        115         44
ONSA       85         91        100         94         94        105        101
PAMA       96        102        102         98         97         97         97
PIE1       91         94         94         90         90         91         92
QUIN       90         81         96         78         77         29          0
RCM2      101        108         97        103        105        101         96
SANT*     107        106        110        109        109        109        107
STJO       97        106        107        102         98         97        103
TAIW       83        104        100         96         98         97        104
TIDB       96         99        101        100         35         69        103
TROM*     108        114        115        111        112        112        114
USUD       97        102        108        102        104        106        106
WEST      100         98         99         96         92         84         17
WETT       98        105        103         96         81         21         31
YAR1*      68         91        112        109        109        109        108
YELL      106        108        112        107        107        105        105
_______________________
*Indicates fiducial site; #indicates deweighted site.
END GROUND STATION INCLUSION TABLE