Subject: [IGSREPORT-3054] Wk 0873 JPL Analysis Report
From: D C Jefferson
Date: Thu, 10 Oct 1996 14:52:46 PDT

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IGS Electronic Report    Thu Oct 10 14:52:46 PDT 1996      Message Number 3054
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Author: D C Jefferson
Subject: Wk 0873 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0873 (DAYS 273-279, DATES 1996 Sep 29 - Oct 05)
******************************************************************************

Submitted by the JPL IGS/FLINN Analysis Team:

J F Zumberge, D C Jefferson, M B Heflin, M M Watkins, F H Webb

all at the Jet Propulsion Laboratory, California Institute of Technology, 
Pasadena, CA  91109.

Files listed below are available in Unix compressed format and can be
retrieved using anonymous ftp to sideshow.jpl.nasa.gov (128.149.70.41),
directory pub/jpligsac/0873.  These files have also been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl08737.sum         This text file.
jpl08737.erp         Earth rotation parameters for GPS week 873.
jpl08737.snx         Ground station coordinates for GPS week 873, SINEX format.
jpl0873[0-6].sp3     GPS ephemerides for GPS week 873, sp3 format.
______________________________________________________________________________

Median Orbit Repeatability (see table below): 19.0 cm

STRATEGY UPDATE
---------------
Since GPS week 870, we have been excluding data from PRN10 in our analyses
(see jpl8707.sum).  Beginning this week, we begin to use data from this
satellite again; however, the data are heavily deweighted (we have used this
strategy in the past).  Doing so prevents mismodeling of this satellite from
affecting other estimated parameters.  At the same time, its performance
(orbit repeatability statistics, etc.) can still be monitored.

Please note that we have treated the newly-launched PRN30 in a similar manner.
However, due to implementation time and some initial software anomalies, some
days included data from the two new satellites using normal weighting.  These
are PRN30 on day 273, and PRN10 on day 279.  As the orbit repeatability
statistics show, these satellites were mismodeled on these days, and have
been moved from the corresponding sp3 files (jpl08730.sp3 and jpl08736.sp3)
accordingly.

GENERAL
-------
According to the file nanu1996.mes obtained from the IGS CBIS, PRN18 was
scheduled unusable on day 275 for maintenance and repositioning.  Data from
this satellite did not meet our convergence criteria on this nor the previous
day (274), and have been excluded from our analyses of both days.  Data from
PRN30 was similarly excluded on these days, also having convergences in excess
of our criteria.

Also, according to IGS Mail Message No. 1451, the antenna change for MADR
scheduled on day 270 (see IGS Mail No. 1440) actually occured on day 278.
This station was NOT used as a fiducial (constrained) site in the analyses
of days 273 through 278.

Lastly, beginning this week, we add one new candidate station.  As with most
stations, this site is given the opportunity to participate in the orbit and
clock solution as the global site distribution varies.  The following nominal
coordinates were assumed:
                                 X (m)          Y (m)          Z (m)
HRAO (Hartebeesthoek RAO,    5085353.0467   2668424.4571  -2768705.3570
 Krugersdorp, South Africa)

Due to potential problems, data from stations mentioned below were not
considered for use in the global solution for the day indicated.  (For
geographical reasons, they may not have been used in any case.)

WARNING: Data from PRN10 deweighted days 273-278.
WARNING: Data from PRN18 excluded days 274 and 275 due to a maneuver.
WARNING: Data from PRN30 excluded days 274 and 275; deweighted days 276-279.
WARNING: MADR not used as a fiducial days 273-278 due to an antenna change.
WARNING: Data from CASA, CMBB excluded day 273.
WARNING: Data from CASA, KRAK, TROM excluded day 274.
WARNING: Data from BOGT, CASA, DGAR, XIAN excluded day 275.
WARNING: Data from CAS1, TROM excluded day 276.
WARNING: Data from DGAR, GUAM, TROM excluded day 277.
WARNING: Data from DGAR, GUAM, PIN1, POTM excluded day 278.
WARNING: Data from BRAN excluded day 279.

In the following table, UT1R-UTC are the integrated values based on estimated
LODR values in the adjacent column.  See IGS Report No. 1498 (jpl07827.sum)
for details:

JPL ERP TABLE                                GPS week 873 (1996 Sep 29 - Oct 05)
     MJD  XPole  Ypole UT1R-UTC  LODR Xsig Ysig UTsig LODsig Nr Nf Nt  Xrt  Yrt 
            10**-5"      usec    us/d  10**-5"    us   us/d            10**-5"/d
50355.50  26978  23344    67667  1933    3    3     9      9 37 11 26  -90 -385 
50356.50  26806  23022    65725  1951    3    3    10     10 37 10 24 -277 -242 
50357.50  26675  22657    63742  2016    3    3     9      9 37 12 24 -176 -310 
50358.50  26490  22263    61746  1976    3    3    10     10 37 11 26 -168 -402 
50359.50  26293  21876    59778  1959    3    3     9      9 37 11 26 -223 -405 
50360.50  26092  21473    57831  1936    3    4     9      9 37 12 26 -197 -359 
50361.50  25914  21133    55917  1892    3    3    10     10 37 13 26  -90 -280 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 873:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 873 (1996 Sep 29 - Oct 05)
      96  9 29   96  9 30   96 10  1   96 10  2   96 10  3   96 10  4   96 10  5
prn   3d rss (m)
  1       0.30       0.22       0.12       0.09       0.13       0.10       0.20
  2       0.15       0.19       0.23       0.27       0.09       0.12       0.10
  3       0.28       0.28       0.18       0.24       0.24       0.28       0.19
  4       0.13       0.34       0.36       0.19       0.16       0.14       0.20
  5       0.24       0.17       0.31       0.24       0.09       0.09       0.17
  6       0.21       0.23       0.32       0.16       0.11       0.14       0.15
  7       0.10       0.26       0.17       0.09       0.11       0.11       0.20
  9       0.20       0.17       0.21       0.05       0.08       0.11       0.15
 10      23.0       25.45      25.93      19.94       2.90       3.41       3.04
 14       0.18       0.32       0.52       0.42       0.05       0.11       0.19
 15       0.19       0.33       0.26       0.21       0.08       0.16       0.20
 16       0.10       0.15       0.20       0.19       0.20       0.17       0.27
 17       0.26       0.20       0.16       0.37       0.25       0.26       0.25
 18       0.1                              0.1        0.13       0.43       0.50
 19       0.15       0.25       0.21       0.19       0.57       0.49       0.23
 21       0.29       0.23       0.26       0.16       0.17       0.12       0.10
 22       0.13       0.23       0.26       0.23       0.14       0.16       0.09
 23       0.28       0.23       0.14       0.31       0.26       0.12       0.16
 24       0.12       0.22       0.37       0.10       0.18       0.13       0.10
 25       0.13       0.24       0.30       0.18       0.09       0.12       0.11
 26       0.17       0.17       0.37       0.27       0.35       0.20       0.17
 27       0.12       0.16       0.14       0.18       0.12       0.26       0.12
 28       0.20       0.16       0.16       0.33       0.22       0.21       0.12
 29       0.14       1.13       1.83       1.21       0.05       0.17       0.11
 30       1.2                              8.2        7.12       5.29       5.33
 31       0.16       0.51       0.34       0.27       0.18       0.33       0.19
_______________________
END ORBIT REPEATABILITY TABLE

The following table statistically summarizes this week's "engineering data", as
described in IGS Report No. 1528:

JPL ENGINEERING DATA SUMMARY TABLE           GPS week 873 (1996 Sep 29 - Oct 05)
 receiver/transmitter (dot means point positioned, * means fiducial site)
 |     days analyzed
 |     |      rms clock noise (ns)
 |     |      |           average clock solution (us)
 |     |      |           |           rms pseudorange (cm)
 |     |      |           |           |   (dot means pcode not analyzed)
 |     |      |           |           |           rms phase (mm)
 |     |      |           |           |           |           average arc (hr)
 |     |      |           |           |           |           |
 |___  |__    |_______    |_______    |___        |___        |__
ALGO*  6.8    .           .           46.3        4.53        2.40    
AREQ   2.8    88.5       -.360        42.4        4.76        1.94    
ASC1   3.9    848.       -.388        79.6        5.76        1.69    
BAHR   4.7    .414        266.        47.8        4.63        2.50    
BOGT   1.7    202.       -.326        65.1        5.62        1.68    
BRAZ   4.0    .140e+04   -.361        56.8        5.76        2.50    
BRMU   2.0    115.       -.407        38.5        5.53        2.70    
BRUS   5.0    .364        2.63        61.6        5.88        2.34    
CAS1   3.0    14.3        276.        37.6        7.12        1.43    
CHAT   6.9    103.       -.358        80.9        5.60        2.44    
CHUR   2.0    6.33        102.        34.0        5.54        1.64    
COCO   3.9    128.       -.133e+04    49.6        5.00        2.25    
CRO1   5.9    223.       -.370        41.0        6.41        1.74    
DAV1   1.9    5.86        231.        34.4        5.00        1.39    
DGAR   1.0    .199e+06   -24.0          .         4.96        .748    
EISL   5.6    .568e+07   -.130e+05    40.4        6.19        2.02    
ENG1   1.0    .290e+06    506.        99.0        11.0        2.25    
FAIR*  7.0    .134       -1.19        39.3        4.77        1.79    
FLIN   3.0    86.3       -.364        92.7        4.00        2.22    
FORT   4.8    42.4       -.668        49.2        6.44        1.86    
GOL2*  7.0    84.4        .245e-01    44.7        5.32        2.33    
GUAM   4.9    .114e+04   -.299        60.9        7.88        1.60    
HART*  7.0    39.8       -1.29        45.5        4.87        1.94    
HKLO   2.9    .289e+06    497.        49.3        5.67        2.46    
IRKT   5.5    .296       -.264        54.4        4.85        2.19    
KELY   2.0    73.8       -.368        64.5        5.53        1.88    
KERG   5.0    114.       -19.0          .         5.21        1.74    
KIRU   4.0    3.02       -.527        52.6        5.77        2.01    
KIT3   7.0    124.       -.350        55.4        4.61        2.31    
KOKB*  6.9    2.26        3.28        67.6        6.07        2.39    
KOSG*  7.0    193.        .794e-03    43.7        4.45        1.84    
KWJ1   7.0    84.6       -.349        59.2        7.60        1.49    
LAMA    .9    34.7       -22.1        52.0        4.00        1.44    
LHAS   3.8    287.       -.361        56.5        5.51        2.29    
MAC1   2.9    84.5       -.299        30.4        4.70        1.59    
MADR*   .7    .373e-01    .545e-01      .         5.00        2.71    
MALI   5.8    122.       -54.1          .         7.53        1.40    
MAS1   5.8    152.       -.482        49.7        4.91        2.05    
MCM4   7.0    95.7       -.348        42.9        5.73        1.44    
MDVO   1.0    .415        190.        68.0        6.00        2.72    
MKEA   4.9    .969e-01   -.623        48.2        6.26        2.27    
OHIG   6.3    .188e+05   -2.41        52.2        4.61        1.40    
PAMA   5.8    670.       -.285          .         10.5        1.73    
PERT   5.9    71.4       -.726        48.7        4.53        2.30    
RCM5   4.0    116.       -.376        67.4        7.03        2.31    
REYK   4.0    78.8       -.341        57.8        5.77        1.95    
SANT*  6.9    .158e+04    1.05        43.1        5.04        1.79    
THU1   4.8    75.3       -.334        45.7        5.87        1.78    
TID2*  6.9    35.8       -.464        43.6        6.17        2.16    
TROM*  2.8    .253e+04    5.52          .         5.00        1.61    
USUD   7.0    1.38        2.20        33.5        4.93        2.11    
WTZR*  5.7    .128        .326        61.8        4.15        2.61    
WUHN   2.0    4.04       -68.8        47.0        4.00        2.42    
YAR1*  7.0    3.79       -1.36          .         4.00        1.76    
YELL*  7.0    .980e-01   -1.99        42.5        4.47        1.57    
PRN01  7.0    81.6        3.39        53.3        5.59        2.50    
PRN02  7.0    79.8       -296.        54.2        5.45        2.59    
PRN03  7.0    82.0        57.2        51.4        5.89        2.19    
PRN04  7.0    81.4        47.0        51.6        6.03        2.06    
PRN05  7.0    80.6        60.3        52.0        5.45        2.58    
PRN06  7.0    78.9        2.17        50.0        5.30        2.69    
PRN07  7.0    81.5        728.        50.9        5.46        2.21    
PRN09  7.0    79.8       -12.7        53.9        5.60        2.42    
PRN10  1.0    84.4        199.        54.0        6.00        2.59    
PRN14  7.0    81.1        14.9        50.3        5.79        2.48    
PRN15  7.0    3.34        346.        60.2        5.63        2.41    
PRN16  7.0    84.0        27.7        52.5        5.46        2.22    
PRN17  7.0    81.0       -127.        55.5        5.45        2.42    
PRN18  5.0    83.1        12.4        46.0        5.63        2.35    
PRN19  7.0    81.3        124.        52.2        5.73        2.46    
PRN21  7.0    82.4       -29.5        53.8        5.30        2.47    
PRN22  7.0    81.7        340.        48.1        5.45        2.45    
PRN23  7.0    81.3        4.12        55.8        5.16        2.16    
PRN24  7.0    82.2        317.        51.4        6.17        2.28    
PRN25  7.0    80.5       -3.70        50.5        5.89        2.54    
PRN26  7.0    79.6       -46.3        50.6        5.60        2.41    
PRN27  7.0    80.5        3.22        51.3        5.46        2.56    
PRN28  7.0    2.65        109.        65.3        4.73        2.71    
PRN29  7.0    79.7        .964        46.3        7.33        2.77    
PRN30  1.0    1.71       -.688        59.0        7.00        3.13    
PRN31  7.0    80.4        56.1        52.5        6.04        2.41    
_______________________
END ENGINEERING DATA SUMMARY 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
      96  9 29   96  9 30   96 10  1   96 10  2   96 10  3   96 10  4   96 10  5
prn   3d rss (m)
  1       8.4        9.3        8.4        8.4        7.6        6.5        7.1 
  2       2.5        2.7        3.4        3.8        3.9        3.1        3.3 
  3       5.5        5.4        5.0        5.2        4.4        8.2        5.3 
  4       5.3        4.8        5.3        6.0        4.6        3.5        3.8 
  5       5.0        2.2        2.4        2.5        3.1        3.1        4.6 
  6       6.9        7.5        7.4        6.5        7.1        7.2        8.2 
  7       8.7        8.1        6.4        6.6        6.8        6.9        6.5 
  9       4.5        3.8        4.0        3.6        4.0        6.3        7.6 
 10      15.8       17.3       20.2       13.0       15.9       12.4       14.2 
 14       2.6       15.9       18.5        9.4        3.9        3.4        2.7 
 15       6.1        4.1        3.2        3.2        3.5        3.7        3.1 
 16       3.8        3.4        4.0        3.6        3.1        2.7        2.3 
 17       6.1        2.7        3.6        3.5        2.7        2.1        4.8 
 18       3.0                              7.2        8.1        3.0        7.1 
 19       2.3        3.0        3.1        2.5        2.6        7.7        5.3 
 21       4.7        4.0        4.3        4.2        3.7        3.3        3.8 
 22       7.4        6.2        4.7        4.2        5.1        4.3        3.8 
 23       2.9        3.2        2.8        3.8        3.1        3.0        4.4 
 24       5.7        5.5        5.6        4.9        4.5        4.7        4.6 
 25       8.9        6.4        6.7        5.5        5.0        4.0        4.6 
 26       4.8        4.9        3.9        4.4        4.7        3.7        4.1 
 27       7.5        7.4        7.8        7.6        7.8        7.3        8.1 
 28      10.1        9.0        7.1        5.8        3.6        3.6        4.6 
 29       3.0        3.1       12.4       22.9       15.6        3.2        2.0 
 30                                       15.8       26.2       42.6       15.4 
 31       5.5        4.3        4.2        3.4        3.8        4.7        2.8 
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

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