Subject: [IGSREPORT-2620] Wk 0850 JPL Analysis Report
From: D C Jefferson
Date: Thu, 2 May 1996 16:15:48 PDT

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IGS Electronic Report    Thu May  2 16:15:48 PDT 1996      Message Number 2620
******************************************************************************

Author: D C Jefferson
Subject: Wk 0850 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0850 (DAYS 112-118, DATES 1996 Apr 21 - Apr 27)
******************************************************************************

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/0850.  These files have also been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl08507.sum         This text file.
jpl08507.erp         Earth rotation parameters for GPS week 850.
jpl08507.snx         Ground station coordinates for GPS week 850, SINEX format.
jpl0850[0-6].sp3     GPS ephemerides for GPS week 850, sp3 format.
______________________________________________________________________________

Mean Orbit Repeatability (see table below): 20.2 cm

STRATEGY UPDATE
---------------
Beginning this week, we attempt ambiguity resolution on the entire global 
network (with orbit adjustment), without an imposed limit on baseline length.

GENERAL
-------
According to the file nanu1996.mes obtained from the IGS CBIS, PRN06 was 
unusable on day 117 for maintenance/repositioning.  Data from this satellite
did not meet our convergence criteria for this nor the previous day (116),
and were subsequently excluded from our analyses for both days.

Also, PRN18 was unsuable for an indefinite period beginning day 112.  Data
from this satellite did not meet our convergence criteria for the following
day (113), and was excluded from this day's analysis only.  Although included
on adjacent days 112 and 114, anomalous behavior was observed and we have 
elected to remove this satellite from these days' sp3 orbit products as 
well (jpl08500.sp3 and jpl08502.sp3).

For various reasons, some days processed this week were analyzed with a
global network of less than the usual 37 stations:

                       96apr24 - only 28 sites used
                       96apr26 - only 30 sites used
                       96apr27 - only 30 sites used

Also, at this time, the solutions for day 119 are not available, hence the
single-decimal level of precision for day 118 in the orbit repeatability
table.

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 BOGT, BRAN, MATE, POTS excluded day 112.
WARNING: Data from PRN18, BOGT, BRAN, CHAT, CHIL, FORT, HOPB, MONP, TIBB 
         excluded day 113.
WARNING: Data from BRAN, CHAT, CMBB, DAM2, FORT, LAMA, TIBB excluded day 114.
WARNING: Data from FORT, TIBB excluded day 115.
WARNING: Data from PRN06, KERG, MATE, MOLA, PERT, TIBB, TID2, USC1, WEST, YAR1           excluded day 116.
WARNING: Data from PRN06, TIBB, TMGO, USNA excluded day 117.

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 850 (1996 Apr 21 - Apr 27)
     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
50194.50  -9725  55589   324712  2184    3    4     9      9 37 12 25  405  126 
50195.50  -9379  55753   322538  2164    4    4     9      9 37 12 24  361  151 
50196.50  -9011  55950   320362  2188    4    4     9      9 37 10 25  378  184 
50197.50  -8673  56116   318165  2205    4    4     9      9 28 10 25  373  163 
50198.50  -8329  56314   315935  2255    5    6    11     11 37  8 24  347  139 
50199.50  -7945  56400   313720  2176    3    3     9      9 30 11 24  395  105 
50200.50  -7522  56537   311514  2236    3    3     9      9 30 11 25  404  150 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 850:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 850 (1996 Apr 21 - Apr 27)
      96  4 21   96  4 22   96  4 23   96  4 24   96  4 25   96  4 26   96  4 27
prn   3d rss (m)
  1       0.18       0.22       0.17       0.18       0.13       0.24       0.2 
  2       0.21       0.26       0.27       0.49       0.48       0.42       0.3 
  3       0.45       0.43       0.49       0.38       0.40       0.58       0.5 
  4       0.26       0.13       0.11       0.10       0.13       0.07       0.1 
  5       0.15       0.18       0.13       0.18       0.11       0.16       0.1 
  6       0.17       0.10       0.09       0.1                                  
  7       0.30       0.14       0.11       0.12       0.18       0.09       0.1 
  9       0.12       0.16       0.16       0.16       0.15       0.20       0.1 
 14       0.19       0.14       0.13       0.10       0.08       0.09       0.1 
 15       0.12       0.12       0.17       0.14       0.17       0.13       0.1 
 16       0.46       0.32       0.63       0.52       0.49       0.36       0.1 
 17       0.31       0.19       0.15       0.17       0.10       0.17       0.1 
 18       1.3                   0.2        0.04       0.09       0.07       0.0 
 19       0.26       0.16       0.21       0.15       0.20       0.15       0.1 
 20       0.15       0.14       0.08       0.13       0.08       0.09       0.1 
 21       0.41       0.22       0.23       0.34       0.27       0.14       0.2 
 22       0.13       0.13       0.14       0.11       0.08       0.13       0.1 
 23       0.34       0.20       0.13       0.26       0.23       0.17       0.2 
 24       0.12       0.15       0.20       0.17       0.09       0.10       0.3 
 25       0.10       0.13       0.14       0.11       0.10       0.10       0.1 
 26       0.33       0.22       0.14       0.17       0.17       0.15       0.2 
 27       0.28       0.17       0.30       0.38       0.32       0.20       0.1 
 28       0.31       0.24       0.25       0.19       0.39       0.34       0.1 
 29       0.14       0.11       0.12       0.09       0.09       0.12       0.1 
 31       0.39       0.21       0.28       0.09       0.16       0.32       0.3 
_______________________
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 850 (1996 Apr 21 - Apr 27)
 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)
 |     |      |           |           |           |           |
 |___  |__    |_______    |_______    |___        |___        |__
ALBH   1.0    3.49       -1.72        42.0        5.00        2.91    
ALGO*  6.7    .           .           45.8        4.35        2.91    
ANKR   1.9    119.       -2.20        69.0        4.00        2.71    
AREQ    .9    100.       -2.10        41.0        5.00        2.51    
AUCK   2.0    82.3       -2.15        38.5        4.52        2.95    
BRMU   4.0    118.       -2.19        38.5        5.26        3.02    
BRUS    .9    .247       -5.04        59.0        4.00        2.71    
CHAT   5.0    98.9       -2.20        81.3        5.22        3.08    
CRO1   6.0    196.       -2.19        44.4        6.27        2.15    
DAV1   1.9    7.35        269.        32.6        5.53        1.47    
EISL   1.0    .797e+07   -.143e+05    40.0        6.00        2.57    
FAIR*  7.0    .259       -2.44        39.5        4.74        2.17    
FORT   4.0    .483e+04   -466.        50.1        6.49        3.67    
GOL2*  7.0    .145       -1.55        45.9        4.60        3.12    
GUAM   5.0    97.2       -2.18        55.5        8.23        2.63    
HART*  1.6    30.4       -3.65          .         4.67        2.79    
HKLO   3.0    .289e+06    507.        51.5        5.48        .907    
IISC   4.8    73.0       -2.19        69.0        6.60        2.22    
IRKT   7.0    .551       -2.30        59.7        5.00        2.87    
JPLM   5.0    87.9        453.        29.0        4.00        3.05    
KERG   6.0    120.       -657.          .         5.18        2.68    
KIRU   6.0    32.5       -2.52        57.6        7.54        2.08    
KIT3   6.9    147.       -2.18        57.7        5.74        2.76    
KOKB*  7.0    .185       -.236e+04    63.9        5.87        2.59    
KOSG*  1.9    1.24       -.732        42.0        3.57        2.50    
KWJ1   2.9    84.3       -2.18        55.1        7.05        1.90    
LPGS   3.9    755.       -2.15        50.5        5.77        2.25    
MAC1   1.9    76.2       -2.12        30.0        4.56        2.07    
MADR*  6.9    .367        19.7          .         4.61        2.51    
MALI   6.9    278.        25.4          .         8.32        2.27    
MAS1   5.9    22.2       -2.58        49.7        5.08        2.93    
MCM4   7.0    83.3       -2.18        34.0        4.89        2.13    
MDVO   2.9    .330        122.        69.7        6.00        2.68    
MOIN   4.9    88.4       -2.18        65.5        7.49        1.89    
NOTO   4.9    .126       -13.4        35.8        5.11        3.19    
PAMA   7.0    147.       -2.19          .         10.3        2.22    
PERT   6.0    2.93        36.6        49.2        4.69        3.14    
RCM5   3.0    87.2       -2.17        88.2        6.05        2.25    
REYK   7.0    74.4       -2.19        59.2        6.16        2.06    
SANT*  7.0    7.41       -5.93          .         5.45        2.38    
STJO   5.0    647.       -8.43        37.4        6.13        2.84    
TAEJ    .9    .285e+06    475.        58.0        5.00        3.49    
THU1   6.0    70.3       -2.19        48.7        5.19        2.65    
TID2*  6.0    .132       -2.14        41.0        5.18        3.31    
TROM*  1.9    32.1        68.1          .         5.56        1.85    
TSKB   4.0    5.94       -1.30        52.3        5.27        2.75    
USUD   3.0    8.24       -1.10        37.3        4.70        2.86    
VILL   3.0    3.24       -5.07        65.4        5.50        3.12    
WLPS   1.0    115.       -2.21        72.0        5.00        3.03    
WSMN   1.0    .289e+06    500.        62.0        5.00        .588    
WTZR*  7.0    .191       -1.74        61.3        4.63        2.48    
YAR1*  6.0    2.55        5.88          .         4.19        2.47    
YELL*  6.6    363.       -2.73        50.1        5.44        1.93    
PRN01  7.0    80.7        56.1        57.3        5.89        2.33    
PRN02  7.0    80.5       -252.        54.7        5.59        2.48    
PRN03  6.9    80.2        3.41        50.7        5.30        2.72    
PRN04  7.0    82.7        20.3        50.1        6.00        2.27    
PRN05  7.0    82.7        34.4        49.5        6.01        2.40    
PRN06  5.0    79.6        6.08        48.1        6.00        2.48    
PRN07  7.0    80.2        717.        55.1        5.89        2.19    
PRN09  6.8    80.6       -21.5        56.4        5.63        2.13    
PRN14  7.0    83.3        11.3        51.3        5.46        2.45    
PRN15  7.0    3.36        292.        57.4        5.17        2.30    
PRN16  7.0    81.6        6.32        50.7        7.32        2.47    
PRN17  7.0    81.3       -115.        53.5        5.59        2.46    
PRN18  6.0    82.7       -10.8        50.6        7.06        2.51    
PRN19  6.6    81.6        459.        51.2        5.64        2.39    
PRN20  7.0    80.5        12.9        55.2        5.88        2.41    
PRN21  7.0    81.5       -22.3        55.5        5.44        2.58    
PRN22  7.0    80.8        300.        51.4        5.60        2.25    
PRN23  7.0    80.8        7.50        52.8        5.88        2.42    
PRN24  7.0    81.6       -199.        55.3        6.13        2.52    
PRN25  6.8    80.2       -3.90        51.5        5.89        2.35    
PRN26  7.0    79.6       -187.        51.4        5.85        2.53    
PRN27  6.5    82.9        24.4        53.0        6.14        2.23    
PRN28  7.0    1.97        76.6        59.7        4.62        2.92    
PRN29  7.0    80.2        6.93        46.2        5.44        2.44    
PRN31  6.8    80.5        451.        54.2        5.44        2.60    
_______________________
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  4 21   96  4 22   96  4 23   96  4 24   96  4 25   96  4 26   96  4 27
prn   3d rss (m)
  1       4.7        3.7        3.8        4.4        4.2        4.3        3.5 
  2       2.6        2.7        2.7        2.4        4.0        3.0        3.3 
  3      10.6       13.2       13.8       13.4        8.3        7.1        9.7 
  4       4.4        4.1        5.5        5.8        5.6        5.6        4.4 
  5       4.3        4.2        4.6        4.2        4.4        3.9        3.2 
  6       7.6        6.8        7.7        6.5                              7.7 
  7       5.0        5.8        5.9        6.6        7.6        4.9        5.2 
  9       5.1        4.6        6.0        7.1        8.2        9.2        7.8 
 14       4.5        4.3        4.3        4.1        4.1        3.6        3.0 
 15       4.1        4.3        5.3        4.6        4.5        4.8        5.0 
 16       7.3       21.1       27.4        3.8       17.5       32.3       23.5 
 17       5.4        4.7        5.9        5.8        6.1        6.5        6.1 
 18      68.7                   8.0        6.8        5.8        4.6        4.3 
 19       3.2        3.4        3.3        3.9        5.0        6.2        5.9 
 20       2.7        3.5        3.8        3.3        3.2        3.7        3.1 
 21       2.8        3.7        6.2        6.6        5.5        5.1        2.5 
 22       3.8        4.1        4.2        4.4        4.4        4.6        4.8 
 23       1.9        2.3        2.5        2.0        2.0        1.8        2.5 
 24       5.5        7.5        7.3        6.2        5.4        5.4        5.2 
 25       5.4        5.2        4.9        4.6        4.8        5.5        5.7 
 26       4.6        4.5        4.2        4.1        4.5        4.2        4.1 
 27       3.7        7.4        4.4        6.3        7.5        6.3        6.1 
 28       3.9        3.3        3.7        3.6        2.8        2.7        2.9 
 29       5.5        5.2        4.8        5.0        4.8        4.4        4.7 
 31       2.7        2.8        3.0        3.1        3.3        3.0        3.1 
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

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