Subject: [IGSREPORT-4873] Wk 0955 JPL Analysis Report
From: D C Jefferson
Date: Mon, 11 May 1998 13:53:17 PDT

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IGS Electronic Report    Mon May 11 13:53:17 PDT 1998      Message Number 4873
******************************************************************************

Author: D C Jefferson
Subject: Wk 0955 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0955 (DAYS 116-122, DATES 1998 Apr 26 - May 02)
******************************************************************************

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/0955.  These files (except for *.tro) have also
been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl09557.sum         This text file.
jpl09557.erp         Earth rotation parameters for GPS week 955.
jpl09557.snx         Ground station coordinates for GPS week 955, SINEX format.
jpl0955[0-6].sp3     GPS ephemerides for GPS week 955, sp3 format.
jpl0955[0-6].tro     Ground station troposphere estimates for GPS week 955.
______________________________________________________________________________

Median Orbit Repeatability (see table below): 8.0 cm

STRATEGY UPDATE and CORRECTION
------------------------------
Since GPS week 936, we have typically used the receiver at NRC1 (Ottawa,
Ontario, Canada) as our default reference clock station.  Beginning this week,
we use USNO (US Naval Observatory, Washington D.C.) as the primary reference
clock receiver.  As in our previous IGS summary reports, we will continue to
note days on which USNO was not used as the reference clock for a given
analysis.

Also, for most of the time since it was launched, we have heavily deweighted
data from PRN08 in our analyses.  Beginning this week, we include all data
from this satellite using normal weighting.

As mentioned previously, it is our policy to exclude all pseudorange data
from any older-style Rogue receivers in the ground network, as these data
are found to be degraded under AS conditions.  It has been discovered that
since day 075 (March 16; week 949 day 1), pseudorange data from NYAL has
been mistakenly included for days on which that site was selected.  This
error has been corrected beginning with the analysis of day 123 (May 3;
week 956, day 0).

GENERAL
-------
Data from PRN24 were mismodeled on day 119, and we have chosen to excluded
them from the analysis of this day.

Beginning this week, we add two new sites as candidate stations.  As with
other sites, these stations are 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)
AMCT (Colorado Springs, USA)       -1248596.6102  -4819428.8627   3976505.1459
SUTH (Sutherland, South Africa)     5041274.9589   1916054.0672  -3397076.1650

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 PRN24 excluded day 119.
WARNING: Data from KELY, KSTU, YAKZ excluded day 116.
WARNING: Data from POTS excluded day 118.
WARNING: Data from CRO1 excluded day 119.
WARNING: Data from CRO1 excluded day 120.
WARNING: Data from CRO1, NYAL, SCIP excluded day 121.

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 955 (1998 Apr 26 - May 02)
     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
50929.50 -11267  31798   -19829  2003    2    2     9      9 37 23 27   46  211 
50930.50 -11235  32006   -21801  1940    2    2     9      9 37 21 27   29  228 
50931.50 -11256  32244   -23722  1903    2    2     9      9 37 22 27  -13  245 
50932.50 -11315  32495   -25653  1958    2    2     9      9 37 25 26  -24  275 
50933.50 -11296  32704   -27640  2016    2    2     9      9 37 20 27   -3  263 
50934.50 -11312  32918   -29674  2052    2    2     8      8 37 20 27   -4  221 
50935.50 -11319  33112   -31701  2002    2    2     8      8 37 21 27  -30  204 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 955:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 955 (1998 Apr 26 - May 02)
      98  4 26   98  4 27   98  4 28   98  4 29   98  4 30   98  5  1   98  5  2
prn   3d rss (cm)
  1       9          8         11          8          6          9         10   
  2       7          9          9          5          9          8         17   
  3       4          6          7          5          5          6          6   
  4      12          5          5          6          8          6          9   
  5      12         10          6          6          6          5          8   
  6       6          8          8          9          7         10         11   
  7       9          4          5         19         12         13         19   
  8      79         10          7          6          9          9         14   
  9      12          7          6          6          6         10          7   
 10       7          7          6          5          5          5          7   
 13       7          8          9          4          4          8         18   
 14       7          6         13          8         11         12         11   
 15       8          8         10          5         10         14          9   
 16       8         10         10          7         20         19          9   
 17       6          7          9          9         10          5         12   
 18      10          9          8          6         10          9          5   
 19      10         12         10         10          8          9         19   
 21       5          6          8          4         10          9         14   
 22       5          8          6          6          6          6          7   
 23       7          8         13          8         12          7         13   
 24      17          7          7                     7          6          8   
 25       7          7          4          6          6          4          6   
 26      17         14         12          8         13         15         16   
 27       9         11          9          9          6         12          7   
 29       6          7         10          6          7          7          8   
 30       8          5          6          6          6          5          7   
 31      13         11          8          9          7         11         14   
_______________________
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 955 (1998 Apr 26 - May 02)
 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    .111        .322        57.2        4.16        2.74    
AREQ*  1.0    100.       -.235        56.0        4.00        2.33    
ASC1   6.8    152.       -.238        77.0        5.14        1.59    
AUCK   4.0    86.6       -.239        40.8        4.53        2.73    
BAHR   5.9    .491        97.4        42.1        5.23        3.39    
BARB   2.6    94.1       -.294        33.0        6.36        3.60    
CAS1   4.7    .658e+07   -.119e+05    36.3        5.40        1.51    
CHAT   3.0    111.       -.241        79.7        5.69        2.79    
COCO   5.7    112.       -.193e+05    45.2        6.85        2.93    
CRO1   1.9    596.       -.235        52.6        5.53        1.77    
DAV1*  3.6    129.       -.216          .         5.05        1.36    
DGAR   6.6    668.       -.204        68.4        6.36        1.63    
DRAO   1.0    .114       -.256        39.0        4.00        2.96    
EISL   6.0    121.       -.233        53.4        5.87        3.05    
FAIR*  7.0    66.8       -.562        43.4        4.59        1.99    
FORT*  5.9    .251       -.143        73.4        6.84        1.73    
GALA   7.0    137.       -.231        78.2        6.01        1.62    
GOL2*  7.0    .171        .853        47.0        4.46        2.14    
GUAM*  7.0    122.       -.247        61.2        6.44        2.14    
HARK*  1.8    12.5       -8.34        53.5        5.00        2.88    
HRAO   2.0    70.4       -.237        38.5        4.00        2.76    
IRKT*  5.8    .355        .919e-01    60.9        5.00        2.45    
KELY    .6    99.4       -.243          .         5.00        1.50    
KERG*  4.8    .300e+04    566.          .         5.41        2.27    
KIT3*  3.6    122.       -.231        80.1        4.77        2.42    
KOKB*  7.0    66.4       -.267e-01    73.1        5.03        2.51    
KOUR*  1.0    2.30        4.52        70.0        6.00        2.10    
KWJ1*  7.0    126.       -.241        74.8        5.87        1.90    
LHAS*  3.9    98.5       -.244        70.0        4.50        1.47    
LPGS   1.0    151.       -.192        57.0        5.00        3.44    
MAC1*  3.6    96.7       -.234        38.3        4.59        1.87    
MAD2*  6.9    231.        .632        61.5        6.30        2.13    
MAG0   5.0    .289e+06    486.        32.6        4.82        2.28    
MALI*  7.0    67.9       -750.        84.6        7.00        2.12    
MATE*  1.0    .133       -2.46        44.0        5.00        3.07    
MCM4   3.0    93.6       -.241        35.5        4.65        1.36    
MKEA   2.0    .121       -.174        52.7        5.00        2.70    
NICO    .9    95.3       -.232        52.0        5.00        2.55    
NOUM   2.0    .289e+06    503.        60.0        6.51        2.17    
NYA1   5.7    250.       -1.46        41.8        5.19        1.92    
NYAL   1.0    .159       -1.77        71.0        5.00        1.50    
OHIG*  6.6    .447e+06   -26.6        58.4        5.21        1.87    
ONSA*  7.0    .234e+04    1.42        40.8        3.91        2.22    
PETR   1.0    84.5       -.226        54.0        5.00        2.51    
POL2   2.0    86.0       -.234        53.5        3.53        2.56    
REYK   1.0    79.5       -.269        59.0        6.00        1.99    
SANT*  6.1    .162e+04   -.194        45.6        4.96        1.53    
SELE    .9    111.       -.270        44.0        4.00        3.11    
SFER    .8    .610        26.4        65.0        5.00        3.27    
STJO   1.0    2.72        5.48        49.0        4.00        2.93    
SUTH   3.0    119.       -.236        39.8        4.00        2.50    
TID2*  7.0    .156        6.30        36.7        5.16        2.49    
TSKB*  7.0    1.61       -2.26        48.6        4.87        2.82    
USNO   7.6    .           .           55.9        5.31        2.67    
USUD   3.0    1.86        .277        46.7        5.47        2.73    
WTZR*  6.5    .340       -1.08        62.0        4.94        2.92    
WUHN   5.8    .134e+06   -96.8        52.5        5.18        2.37    
YAKZ    .9    .290e+06    427.        46.0        5.00        2.55    
YAR1*  7.0    79.2       -.236        36.5        4.00        2.25    
YELL*  7.0    .591       -.283        51.8        5.15        1.44    
ZECK    .9    76.1       -.247        47.0        4.00        2.51    
PRN01  7.0    81.6        45.8        52.0        5.45        2.06    
PRN02  7.0    79.8       -481.        59.9        5.15        2.16    
PRN03  7.0    82.0        122.        56.7        5.00        2.29    
PRN04  6.6    81.2        24.0        55.3        5.16        2.03    
PRN05  7.0    81.0        147.        57.7        5.00        2.28    
PRN06  7.0    81.5       -.443        57.5        5.15        2.07    
PRN07  7.0    83.4        776.        55.1        5.00        2.04    
PRN08  7.0    81.6        628.        56.3        5.30        2.09    
PRN09  7.0    80.6       -39.5        58.6        5.00        2.00    
PRN10  7.0    81.6        21.0        58.6        5.00        2.11    
PRN13  7.0    82.7        826.        58.4        5.16        2.15    
PRN14  7.0    84.0        28.9        51.2        5.00        2.40    
PRN15  6.6    3.39        550.        59.6        5.30        2.00    
PRN16  7.0    79.6        59.5        58.9        5.29        2.30    
PRN17  6.7    82.4       -179.        58.0        5.00        2.03    
PRN18  7.0    83.8        13.5        55.2        5.44        2.15    
PRN19  6.9    84.7        390.        55.3        5.14        2.11    
PRN21  7.0    79.9        36.3        57.8        5.00        2.08    
PRN22  7.0    80.9        .749        54.3        5.00        2.31    
PRN23  7.0    79.9        12.4        60.2        5.45        2.20    
PRN24  5.7    80.3        837.        57.5        5.18        2.04    
PRN25  7.0    79.5       -6.77        52.3        5.00        2.20    
PRN26  7.0    82.1        8.11        53.0        5.30        2.00    
PRN27  7.0    81.5        25.6        57.2        5.30        2.10    
PRN29  7.0    81.6        440.        53.1        5.15        2.35    
PRN30  7.0    78.3       -36.6        54.7        5.00        2.13    
PRN31  7.0    82.4        3.09        57.5        5.45        2.26    
_______________________
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
      98  4 26   98  4 27   98  4 28   98  4 29   98  4 30   98  5  1   98  5  2
prn   3d rss (cm)
  1     208        270        263        456        603        571        446   
  2     382        226        364        400        787        536        930   
  3     270        260        179        260        275        251        209   
  4     659        518        567        400        512        611        725   
  5     193        297        207        253        342        367        307   
  6     526        519        450        424        702        547        385   
  7     528        484        262        242        440        296        181   
  8     543        537        527        538        319        311        521   
  9     229        398        224        501        448        262        300   
 10     326        328        306        220        290        281        532   
 13     781        328        618        198        892        216        586   
 14     477       1224        681        295        401        654        338   
 15     336        275        496        357        436        300        316   
 16     295        366        329        302        536        608        434   
 17     314        323        311        237        409        388        347   
 18     215        342        475        451        336        433        330   
 19     242        311        458       1102       1523        378        232   
 21     479        299        162        151        298        363        213   
 22     263        268        286        294        280        305        302   
 23     573        351        446        409        230        204        346   
 24     343        469        268                  1088        760        293   
 25     252        447        555        258        270        362        439   
 26     242        222        237        195        218        237        176   
 27     469        359        393        657        376        381        187   
 29     323        230        264        163        258        346        238   
 30     264        246        190        270        280        187        176   
 31     326        418        368        264        380        359        260   
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

global:   algo areq asc1 auck bahr barb cas1 chat coco cro1 dav1 dgar drao eisl fair fort gala gol2 guam hark hrao irkt kely kerg kit3 kokb kour kwj1 lhas lpgs mac1 mad2 mag0 mali mate mcm4 mkea nico noum nya1 nyal ohig onsa petr pol2 reyk sant sele sfer stjo suth tid2 tskb usno usud wtzr wuhn yakz yar1 yell zeck

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