Subject: [IGSREPORT-4452] Wk 0936 JPL Analysis Report
From: D C Jefferson
Date: Tue, 30 Dec 1997 14:34:33 PST

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IGS Electronic Report    Tue Dec 30 14:34:33 PST 1997      Message Number 4452
******************************************************************************

Author: D C Jefferson
Subject: Wk 0936 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0936 (DAYS 348-354, DATES 1997 Dec 14 - Dec 20)
******************************************************************************

Submitted by the JPL IGS/FLINN Analysis Team:

D C Jefferson, Y E Bar-Sever, M B Heflin, M M Watkins, F H Webb, J F Zumberge

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 (137.78.60.30),
directory pub/jpligsac/0936.  These files (except for *.tro) have also
been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl09367.sum         This text file.
jpl09367.erp         Earth rotation parameters for GPS week 936.
jpl09367.snx         Ground station coordinates for GPS week 936, SINEX format.
jpl0936[0-6].sp3     GPS ephemerides for GPS week 936, sp3 format.
jpl0936[0-6].tro     Ground station troposphere estimates for GPS week 936.
______________________________________________________________________________

Median Orbit Repeatability (see table below): 9.0 cm

STRATEGY UPDATE
---------------
Until now, we have typically used the receiver at ALGO (Algonquin Park,
Ontario, Canada) as our reference clock station.  Beginning this week, we
use NRC1 (Ottawa, Ontario, Canada) as the primary reference clock receiver,
as this station more accurately reflects actual GPS time.  As in our previous
IGS summary reports, we will continue to note days on which NRC1 was not
used as the reference clock for a given analysis.

GENERAL
-------
We continue to deweight data from PRN13 this week.  Also, data from the
newly-launched PRN08 were mismodeled all days this week, and consequently
have been excluded from all analyses.

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: NRC1 (not ALGO) is primary reference clock as of day 348.
WARNING: USNO (not NRC1) used as reference clock day 351.
WARNING: TID2 (not NRC1) used as reference clock days 352 and 353.
WARNING: Data from PRN08 excluded the entire GPS week 936.
WARNING: Data from PRN13 deweighted the entire GPS week 936.
WARNING: Data from CASA, KOUR, TAEJ excluded day 348.
WARNING: Data from CASA excluded day 349.
WARNING: Data from CRO1, KOKB excluded day 351.
WARNING: Data from KOUR, RCM6 excluded day 352.
WARNING: Data from BRAN, SANT, SELE excluded day 353.
WARNING: Data from KOUR, QUIN excluded day 354.

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 936 (1997 Dec 14 - Dec 20)
     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
50796.50  14821  19974   240475  1718    3    3     8      8 37 10 26 -285 -251 
50797.50  14540  19736   238767  1698    2    2     8      8 37 11 26 -266 -290 
50798.50  14247  19533   237081  1674    3    3     8      8 37 10 26 -293 -250 
50799.50  13977  19321   235422  1643    3    3     8      8 37 10 26 -218 -244 
50800.50  13804  19178   233743  1716    3    3     9      9 37 11 26 -161 -141 
50801.50  13637  19092   232051  1667    3    4     8      8 37 10 26 -196 -149 
50802.50  13384  19016   230383  1670    3    3     8      8 37 10 26 -242 -154 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 936:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 936 (1997 Dec 14 - Dec 20)
      97 12 14   97 12 15   97 12 16   97 12 17   97 12 18   97 12 19   97 12 20
prn   3d rss (cm)
  1       7         13         16          7          4         13          5   
  2      12          8          6         13         12          5          7   
  3       5          8          9          7          8          8          8   
  4      14         24         13          7          9         12          9   
  5       8          8         12          7          9          9          5   
  6      10          8          6          4          8          8         10   
  7      14         12         10         11         12          7          9   
  9       5          7          6          4          3          5          5   
 10       6          8          8         11         12          7          8   
 13      54         50         44         30         24         44         29   
 14      10         27         25         18         28         25         13   
 15      13         15          7          9          7         11          7   
 16      11         10          9         11         20         18          8   
 17       6          6          6          7          6         11          5   
 18      16         17         17         13         10         13         15   
 19      12         17          7          8          8          5          8   
 21       6         10          6          7          7          7          7   
 22       7         12          8         11         17         10          7   
 23       7          9          5          7         11          9          7   
 24       7         10         10         12         10          4          6   
 25       6         13         18         22         26         14         16   
 26       9          6          6          8          9         10          9   
 27       8          8          8         17          9          7          6   
 29      16         12          6         12         13         18          6   
 30      10          5          6          7          9          8          3   
 31       8         12          6         10          7          8          8   
_______________________
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 936 (1997 Dec 14 - Dec 20)
 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*  7.0    .779e-01    2.71        45.2        4.04        3.09    
ANKR   1.9    145.       -.204e-01    58.3        4.50        2.81    
AREQ   5.0    96.8       -.503e-01    47.8        4.82        2.27    
ASC1   6.9    153.       -.239e-01    72.4        5.30        1.66    
BAHR   7.0    .477        235.        42.9        4.87        3.80    
BRAZ   1.0    109.        .796e-01    63.0        6.00        1.82    
BRUS   1.0    437.        1.46        60.0        4.00        2.45    
CAS1   6.9    32.6        279.        37.9        5.31        1.57    
CHAT   7.0    116.       -.304e-01    75.2        5.16        2.62    
COCO   6.9    88.7       -.119e+04    42.6        5.90        3.17    
CRO1   5.0    .103e+04    .433e-01    44.7        5.21        2.01    
DGAR   7.0    183.       -.256e-01    77.6        5.15        1.43    
EISL   6.9    761.       -.250e-01    57.5        5.16        2.66    
FAIR*  7.0    52.2       -.376        36.2        4.16        2.43    
FLIN   2.0    75.6       -.145        39.0        3.00        2.59    
FORT   6.0    .190       -2.94        65.7        6.35        1.52    
GALA   3.0    93.8       -.604e-01    62.0        6.45        1.79    
GOL2*  7.0    .102       -.513        55.2        4.31        2.17    
GUAM   2.6    132.        .142e-01    54.7        7.97        2.49    
HARK   4.6    27.3        5.56        60.3        5.00        2.76    
IISC   7.0    91.3       -.313e-01    66.3        5.15        2.46    
IRKT   4.9    .150       -.383        48.6        5.00        2.44    
KERG   4.7    146.        915.          .         5.22        2.60    
KIRU   3.0    480.        .359e-01    50.0        6.35        2.18    
KOKB*  4.4    75.2        .123        58.0        5.14        1.89    
KOSG*  6.9    .405e+04   -24.4        38.7        3.74        2.51    
KOUR   1.7    .217e+04   -6.54          .         4.00        1.80    
KWJ1   7.0    113.       -.313e-01    59.1        6.02        1.65    
LPGS   1.0    583.        .533e-01    63.0        6.00        3.27    
MAC1   1.9    86.8        .364e-01    48.0        4.00        2.65    
MAD2*  6.7    250.       -.495        65.8        6.35        2.07    
MCM4   7.0    106.       -.182e-01    67.0        5.00        1.40    
MDVO    .9    .921e-01    212.        77.0        7.00        2.42    
MKEA   5.0    .686e-01   -.302        49.6        4.81        2.49    
MOIN   3.9    107.       -.172e-01    63.3        6.56        1.72    
NICO   3.0    83.3       -.738e-01    33.7        4.00        2.63    
NRC1   4.0    .           .           57.7        3.54        3.09    
OHIG   1.9    .146e+04    .100        63.2        5.00        1.98    
PERT   6.0    1.94       -9.32        51.5        4.69        2.80    
POL2   6.9    87.9       -.218e-01    44.2        4.00        2.78    
REYK   5.0    82.8       -.560e-01    60.2        6.61        1.93    
SANT*  3.4    .104e+04    .915        41.4        4.53        .934    
STJO   1.0    1.60        .466        38.0        4.00        2.57    
TAHI   3.8    150.        .363e-01    92.5        6.29        2.49    
THU1   7.0    110.       -.322e-01    52.1        5.62        2.51    
TID2*  7.0    .815e-01    .278e-01    39.3        5.89        2.77    
USNO   1.0    .           .           53.0        5.00        2.74    
USUD   7.0    .739       -10.3        41.7        4.00        2.85    
WES2   2.0    .176        2.07        55.5        4.00        2.72    
WTZR*  7.0    .832e-01    .992        62.0        4.74        2.54    
WUHN   4.9    6.17       -307.        48.3        5.00        2.66    
XIAN   2.0    95.1        .121e-01    59.0        4.00        2.84    
YAR1*  6.9    96.2       -.269e-01    39.0        4.16        2.39    
YELL*  7.0    3.95       -.655        44.4        4.62        2.09    
PRN01  7.0    81.5        35.0        55.5        5.31        2.19    
PRN02  6.9    79.9       -435.        55.9        5.00        2.39    
PRN03  7.0    80.6        80.9        54.6        5.00        2.36    
PRN04  7.0    80.2        1.36        51.6        5.16        2.09    
PRN05  6.9    77.8        126.        51.9        5.00        2.46    
PRN06  7.0    81.9       -.123        52.2        5.00        2.28    
PRN07  7.0    79.5        763.        56.4        5.16        2.39    
PRN09  7.0    81.8       -22.4        52.2        5.16        2.38    
PRN10  6.9    82.8        16.4        56.8        5.00        2.25    
PRN14  7.0    80.6        24.9        55.6        5.02        2.21    
PRN15  7.0    3.46        502.        57.3        5.00        2.53    
PRN16  7.0    82.2        40.9        59.4        5.86        2.37    
PRN17  7.0    81.5       -168.        56.7        5.00        2.18    
PRN18  7.0    83.5        8.62        54.3        4.87        2.26    
PRN19  7.0    80.4        337.        52.9        5.00        2.26    
PRN21  6.9    82.1        11.5        55.1        5.31        2.21    
PRN22  6.8    81.5        36.0        55.8        5.00        2.15    
PRN23  7.0    79.9        7.19        56.3        5.45        2.35    
PRN24  7.0    83.7        775.        53.4        5.00        2.34    
PRN25  7.0    81.7       -6.71        53.4        5.00        2.11    
PRN26  7.0    82.8       -55.9        49.9        5.16        2.18    
PRN27  7.0    79.8        11.4        52.0        4.87        2.76    
PRN29  7.0    81.9        61.3        55.7        5.00        2.51    
PRN30  6.9    84.1       -15.7        52.7        5.16        2.40    
PRN31  6.8    96.6        .135        54.0        5.16        2.49    
_______________________
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
      97 12 14   97 12 15   97 12 16   97 12 17   97 12 18   97 12 19   97 12 20
prn   3d rss (cm)
  1     275        609        336        301        223        242        288   
  2     444        375        253        249        196        139        366   
  3     184        195        328        248        241        262        240   
  4     186        204        292        460        445        424        281   
  5     359        419        395        348        346        406        519   
  6     895        903        733        719        678        632        593   
  7     544        341        514        729        582        590        540   
  9     377        300        390        547        479        292        312   
 10     265        719        848        559        626        965        646   
 13     453        158        164        397        474        272        260   
 14     347        358       1334       1497        268        969       1662   
 15     215        188        210        246        235        258        232   
 16     788        271        377        404        297        234       1198   
 17     594        282        390        584        533        885        504   
 18     178        198        713        436        256        256        412   
 19     222       1617        763        295        409        297        726   
 21     314        187        258        157        204        268        194   
 22    1440        588        461        592        691        555        622   
 23    1033        565        728        487        974       1143        297   
 24     400        225        248        223        198        157        224   
 25     283        606        178        252        284        272        587   
 26     275        237        262        208        288        243        376   
 27     227        428        190        286        205        449        314   
 29     384        464        183        284        702        728        156   
 30     196        212        309        207        233        299        407   
 31     187        281        403        232        292        282        241   
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

global:   algo ankr areq asc1 bahr braz brus cas1 chat coco cro1 dgar eisl fair flin fort gala gol2 guam hark iisc irkt kerg kiru kokb kosg kour kwj1 lpgs mac1 mad2 mcm4 mdvo mkea moin nico nrc1 ohig pert pol2 reyk sant stjo tahi thu1 tid2 usno usud wes2 wtzr wuhn xian yar1 yell

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