Subject: [IGSREPORT-4836] Wk 0953 JPL Analysis Report
From: D C Jefferson
Date: Tue, 28 Apr 1998 18:37:12 PDT

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IGS Electronic Report    Tue Apr 28 18:37:12 PDT 1998      Message Number 4836
******************************************************************************

Author: D C Jefferson
Subject: Wk 0953 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0953 (DAYS 102-108, DATES 1998 Apr 12 - Apr 18)
******************************************************************************

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/0953.  These files (except for *.tro) have also
been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl09537.sum         This text file.
jpl09537.erp         Earth rotation parameters for GPS week 953.
jpl09537.snx         Ground station coordinates for GPS week 953, SINEX format.
jpl0953[0-6].sp3     GPS ephemerides for GPS week 953, sp3 format.
jpl0953[0-6].tro     Ground station troposphere estimates for GPS week 953.
______________________________________________________________________________

Median Orbit Repeatability (see table below): 10.5 cm

UPDATES
-------
Beginning with the analysis of day 070 (98mar11), we have implemented the JPL
GPS solar pressure model (GSPM_XYZ.1) for all Block II and IIA satellites.  We
also use Lockheed-Martin solar pressure for GPS43 (see IGS mail 1833) instead
of the T30 model.  (Note: days 072 and 073 are excluded as they were processed
prior to this implementation.)

Beginning with the analysis of day 089 (98mar30), we have switched the phase
center offset vector for GPS43 from (0,0,-1.72) m to (0.058, -0.068, 0.63) m.
We weight data from GPS43 normally as of this day as well.

GENERAL
-------
According to the file nanu1998.mes obtained from the IGS CBIS, PRN24 was
unusable on days 105 and 106.  We have excluded data from this satellite
on day 106 only.

Since GPS week 951, several sites have been added 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)
GLSV (Golosiiv, Ukraine)            3512889.1452   2068979.8096   4888903.1967
NYA1 (Ny-Alesund, Norway)           1202433.9547    252632.2384   6237772.5646
TRO1 (Tromsoe, Norway)              2102928.6298    721619.4063   5958196.2723

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: USNO (not NRC1) used as reference clock days 102, 104, and 105.
WARNING: MKEA (not NRC1) used as reference clock day 106.
WARNING: TID2 (not NRC1) used as reference clock day 107.
WARNING: Data from PRN08 deweighted the entire GPS week 953.
WARNING: Data from PRN24 excluded day 106.
WARNING: Data from CARR, CIT1, LPGS excluded day 102.
WARNING: Data from CARR, KERG excluded day 103.
WARNING: Data from KELY, KERG, KIT3 excluded day 104.
WARNING: Data from KIT3, MADR excluded day 105.
WARNING: Data from CRO1 excluded day 106.
WARNING: Data from CRO1, EBRE, GRAZ, KELY, KIT3, MADR, ONSA excluded day 107.
WARNING: Data from CRO1, EBRE, GRAZ, KIT3, ONSA excluded day 108.

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 953 (1998 Apr 12 - Apr 18)
     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
50915.50 -11371  28105     7809  2000    3    3    11     11 37 22 27  -51  247 
50916.50 -11424  28365     5825  1968    3    3    11     11 37 19 27  -38  250 
50917.50 -11462  28630     3847  1988    3    3    11     11 37 22 27  -63  241 
50918.50 -11476  28899     1857  1991    3    3    11     11 37 23 27  -51  288 
50919.50 -11468  29152     -120  1964    3    3    11     11 37 22 26  -16  243 
50920.50 -11404  29421    -2082  1960    2    3    10     10 37 22 27   32  279 
50921.50 -11343  29727    -4040  1956    2    3    10     10 37 21 27    3  299 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 953:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 953 (1998 Apr 12 - Apr 18)
      98  4 12   98  4 13   98  4 14   98  4 15   98  4 16   98  4 17   98  4 18
prn   3d rss (cm)
  1      11          9         12         18         10          8          4   
  2      17          9         15         17         14         10         14   
  3       7         10          6          9         10          5         10   
  4      10          8         12         18         15         10         10   
  5       5         13         20         23         19         10         10   
  6       7         21         12         11         13          9          6   
  7      11         11         19         14         11         11         13   
  8      78         93        162        181         76         70         73   
  9      16         23         19         26         14         12          7   
 10      11         10         14         14         15          8          4   
 13       6          6         11         12         13          4          4   
 14      15         16          6          6         10         15          9   
 15       7         11          8         10         10          7          9   
 16       4         10          8          9         11          8          6   
 17      13         10         14         14         11         17         13   
 18       6          7          6         19          7          5          5   
 19      35          5          7         11         12          3          4   
 21      10         16         19         18         21         13         12   
 22       8          6          7          6          6         11          7   
 23      20         14         12         23         14         12          7   
 24      17          8         18         23                    14         12   
 25       7          4          3          7          6          8          4   
 26      17         11         12          9         15         17          9   
 27       9          8          7         18         14         10         13   
 29       9         10          4          8          9          7         11   
 30       5          6         10         13         14          5          4   
 31      12         10         10         14         14         14          7   
_______________________
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 953 (1998 Apr 12 - Apr 18)
 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    .115       -.606        56.8        4.00        2.77    
AREQ*  4.0    114.       -1.68        65.0        4.00        2.26    
AUCK   3.0    85.7       -.235        45.1        4.69        2.51    
BAHR   6.9    .557        96.9        41.0        4.00        2.77    
BARB   1.8    101.       -.293        34.5        7.00        2.90    
BOGT   3.9    .147e+04   -1.52        67.9        5.77        1.61    
CHAT   4.0    106.       -1.60        79.2        5.26        2.67    
COCO   4.7    106.       -.173e+05    50.3        7.41        2.29    
CRO1   1.0    142.        .451e-01    64.0        6.00        2.14    
DAV1*  4.8    137.       -.126          .         4.61        1.45    
DGAR   5.0    616.       -1.24        64.0        6.01        1.61    
EISL   5.9    353.       -1.13        69.9        5.53        2.43    
FORT*  7.0    .248       -1.22        86.4        6.86        1.64    
GALA   2.4    721.       -.165        80.7        5.75        1.37    
GOL2*  6.5    697.       -1.54        63.0        4.00        1.72    
GUAM*  6.9    136.       -1.02        69.0        6.73        1.95    
HARK*  7.0    14.1       -4.30        58.5        4.87        2.33    
IRKT*  6.8    .241       -.690        57.8        5.00        2.64    
KELY    .9    89.0       -.252          .         5.00        1.96    
KERG*  1.9    .326e+04    .369e+04      .         5.56        2.11    
KIT3*  1.9    135.       -.115        71.1        4.00        .939    
KOKB*  6.9    15.7       -.881        85.8        5.21        2.44    
KOUR*  1.9    4.08        .194        75.4        7.00        1.91    
KWJ1*  6.3    295.       -1.02        73.3        6.15        1.44    
LHAS*  6.9    109.       -1.04        73.8        4.46        2.38    
MAC1*  2.5    97.6       -.236        39.0        4.00        1.97    
MAD2*  6.9    243.       -.513e-01    55.5        5.59        2.25    
MAG0   1.0    .288e+06    477.        32.0        4.00        2.41    
MALI*  7.0    107.       -505.        94.0        6.59        1.65    
MCM4   6.9    92.1       -1.00        43.3        5.00        1.01    
MDVO    .9    .191e+06    261.        75.0        6.00        1.83    
MKEA   3.8    295.       -2.70        70.5        4.28        2.59    
NOTO    .8    .213        2.93        45.0        4.00        2.18    
NOUM   3.8    .289e+06    506.        72.1        4.25        1.97    
NRC1   2.2    .           .           77.5        3.54        2.89    
NYA1   1.7    .156       -.827        62.5        5.47        1.95    
NYAL   4.8    7.93       -2.34        70.3        5.20        1.39    
OHIG*  2.8    .751e+06    46.7        62.7        5.00        1.26    
ONSA*  5.0    .269       -.475        39.2        3.83        2.20    
PETR   1.9    88.4       -.955e-01    49.4        5.00        2.34    
PIE1*  2.0    .139       -.240        56.0        4.53        2.56    
POL2   3.0    94.7       -2.22        66.3        4.36        2.37    
RCM6   2.5    167.       -2.56        78.0        4.43        2.38    
REYK   5.0    89.9       -1.37        59.6        5.82        1.96    
SANT*  4.1    293.       -1.75        56.1        4.59        1.61    
STJO   3.0    2.76        3.89        74.5        5.07        2.74    
TAHI   3.4    502.       -.181        83.4        5.30        1.76    
TID2*  7.0    .162        6.40        42.2        5.05        2.19    
TSKB*  7.0    1.59       -2.93        52.7        5.20        3.02    
USNO   3.2    .           .           62.4        5.68        2.71    
USUD   5.0    247.        .846        48.8        5.76        2.29    
WES2   1.0    .255       -6.54        67.0        5.00        2.54    
WSLR   3.0    40.5        489.        44.0        4.00        2.99    
WTZR*  6.0    .431        .593        64.7        4.24        2.72    
WUHN   6.9    7.09       -.114e+04    53.3        4.75        2.32    
YAKA   1.0    105.       -6.47        60.0        5.00        2.52    
YAR1*  7.0    86.5       -1.01        43.3        4.73        2.05    
YELL*  7.0    26.3        11.8        46.2        4.89        1.64    
ZECK   5.0    72.3       -1.33        55.2        4.87        2.46    
PRN01  7.0    78.7        43.8        56.6        5.16        2.28    
PRN02  7.0    82.4       -477.        66.6        5.00        2.21    
PRN03  7.0    80.5        117.        59.0        5.00        2.11    
PRN04  6.6    80.0        20.9        63.4        5.15        2.06    
PRN05  7.0    78.0        144.        66.7        5.00        2.06    
PRN06  7.0    81.7       -1.27        63.5        5.15        2.02    
PRN07  6.9    78.9        774.        62.5        5.00        2.06    
PRN09  6.6    80.3       -38.5        63.0        5.31        2.03    
PRN10  7.0    81.4        19.7        65.4        5.00        2.13    
PRN13  7.0    80.8        836.        60.6        5.00        2.14    
PRN14  7.0    80.0        27.6        57.5        5.00        2.15    
PRN15  6.6    3.51        544.        65.7        5.15        1.88    
PRN16  7.0    82.4        56.8        62.0        5.00        2.36    
PRN17  6.7    81.8       -179.        69.6        5.00        1.89    
PRN18  7.0    80.0        12.2        61.1        5.00        2.22    
PRN19  6.7    78.8        389.        63.6        5.00        1.96    
PRN21  7.0    78.8        33.2        60.7        5.00        2.21    
PRN22  7.0    82.9       -.593        62.6        5.00        2.23    
PRN23  7.0    80.9        11.1        64.2        5.00        2.16    
PRN24  5.7    79.8        832.        64.2        5.99        2.05    
PRN25  6.8    79.6       -7.60        57.1        5.00        2.06    
PRN26  7.0    80.1       -45.6        58.0        5.15        2.21    
PRN27  6.6    78.3        23.3        64.4        5.00        1.89    
PRN29  7.0    81.9        405.        53.2        5.00        2.34    
PRN30  7.0    82.4       -35.2        62.8        5.00        2.07    
PRN31  7.0    82.7        1.94        61.3        5.31        2.14    
_______________________
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 12   98  4 13   98  4 14   98  4 15   98  4 16   98  4 17   98  4 18
prn   3d rss (cm)
  1     460        421        515        560        350        473        522   
  2     209        185        254        519        301        418        243   
  3     234        289        269        371        368        253        341   
  4     586        388        508        300        291        408        822   
  5     413        225        209        283        407        441        334   
  6     506        508        660        573        708        502        425   
  7     366        410        389        342        462        337        474   
  8     223        466        565        222        311        398        582   
  9     300        247        210        405        364        546        590   
 10     158        313        382        264        250        464        379   
 13     247        377        377        453        326        778        384   
 14     288        942       1705        453        736       1025       1403   
 15     452        414        299        356        327        428        684   
 16     462        292        253        368        320        361        925   
 17     512        333        443        341        366        442        334   
 18     872        380        345        316        292        346        450   
 19    1344        967        416        271        305        213        219   
 21     307        333        311        318        282        426        295   
 22     524        507        522        628       1084        592        902   
 23     235        510        513        267        530        398        264   
 24     473        410        516       1867                  1642        742   
 25     244        234        352        349        350        500        292   
 26     228        326        161        173        173        429        312   
 27     764        730        892        822        640       1187        921   
 29     623        385        361        414        568        325        403   
 30     356        371        247        236        362        469        325   
 31     286        342        295        261        282        369        344   
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

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