Subject: [IGSREPORT-4112] Wk 0920 JPL Analysis Report
From: D C Jefferson
Date: Tue, 9 Sep 1997 12:15:13 PDT

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IGS Electronic Report    Tue Sep  9 12:15:13 PDT 1997      Message Number 4112
******************************************************************************

Author: D C Jefferson
Subject: Wk 0920 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0920 (DAYS 236-242, DATES 1997 Aug 24 - Aug 30)
******************************************************************************

Submitted by the JPL IGS/FLINN Analysis Team:

J F Zumberge, Y E Bar-Sever, 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/0920.  These files (except for *.tro) have also
been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl09207.sum         This text file.
jpl09207.erp         Earth rotation parameters for GPS week 920.
jpl09207.snx         Ground station coordinates for GPS week 920, SINEX format.
jpl0920[0-6].sp3     GPS ephemerides for GPS week 920, sp3 format.
jpl0920[0-6].tro     Ground station troposphere estimates for GPS week 920.
______________________________________________________________________________

Median Orbit Repeatability (see table below): 11.0 cm

STRATEGY UPDATE
---------------
This week we introduce several modifications to our processing strategy;
all changes take place as of day 236 (97aug24):
1. We have switched from using the Lanyi troposphere mapping function
   to the Niell mapping function.
2. We are now estimating troposphere horizontal delay gradients at all the
   sites.  The two gradient parameters are modeled as random walk with sigma
   of 0.3 cm/sqrt(hour) and are estimated every five minutes.
3. We have reduced the random walk sigma on the estimated zenith wet delay
   from 10.2 cm/sqrt(hour) to 3 cm/sqrt(hour).
4. We reduced the carrier phase post-fit residual rejection criterion (window)
   from 5 cm to 2.5 cm.

We have not changed the elevation angle cutoff; it remains at 15 degrees.
Details of this estimation strategy are presented in: Bar-Sever, Y.E., P.M.
Kroger and J.A. Borjesson, "Estimating Horizontal Gradients of Tropospheric
Path Delay with a Single GPS Receiver". (Submitted for publication.  Copies
available upon request.)

GENERAL
-------
Data from the newly-launched PRN13 were included on days 238 and 239 only,
heavily deweighted.  This satellite was mismodeled on days 236, 237, 240, 241,
and 242, and has been excluded on these days accordingly.  This satellite
does not appear in any of the sp3 orbit products for this week.

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: USUD (not ALGO) used as reference clock day 236.
WARNING: FAIR (not ALGO) used as reference clock days 237 and 240.
WARNING: NLIB (not ALGO) used as reference clock days 238 and 242.
WARNING: PIE1 (not ALGO) used as reference clock day 239.
WARNING: Data from PRN13 deweigted days 238 and 239, excluded all others.
WARNING: Data from MDO1, METS, TAHI excluded day 236.
WARNING: Data from AOA1, KELY, KOKB, METS, POTS excluded day 237.
WARNING: Data from CSN1, KELY, KOUR, METS, VCIO excluded day 238.
WARNING: Data from CSN1, KELY, KOUR excluded day 239.
WARNING: Data from AOA1, CSN1, GOLD, HERS, KELY, MAD2, MADR, MALI, MCM4, MDO1,           MKEA, NLIB excluded day 240.
WARNING: Data from CSN1, KELY, MADR, MATE excluded day 241.
WARNING: Data from DAM2, MALI excluded day 242.

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 920 (1997 Aug 24 - Aug 30)
     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
50684.50  17827  46926   456735  1449    4    4     8      8 37  8 25  221 -220 
50685.50  18086  46739   455262  1498    4    4     8      8 37  6 25  202 -192 
50686.50  18285  46591   453733  1559    3    4     8      8 37  8 26  190 -183 
50687.50  18500  46424   452161  1586    4    4     9      9 37  7 26  228 -202 
50688.50  18738  46267   450553  1630    4    5    10     10 37  7 25  218 -158 
50689.50  18953  46090   448937  1601    4    4     9      9 37  8 25  227 -250 
50690.50  19144  45886   447321  1632    3    4     9      9 37  9 25  201 -154 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 920:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 920 (1997 Aug 24 - Aug 30)
      97  8 24   97  8 25   97  8 26   97  8 27   97  8 28   97  8 29   97  8 30
prn   3d rss (cm)
  1      15          9         11         19         31          7          9   
  2      10          8          4          8         10          9          9   
  3      31         31         20         21         22         20         19   
  4       7          9          7         24         25         15          4   
  5       6          9          8         16         12         15          4   
  6      23         12         10         16          8         31         20   
  7       9         14          9         11         11         12         10   
  9       9          7         10         13          9         10          5   
 10       9          8          6         47         26         24          7   
 13                            86        101                                    
 14      18         15         12         10         14          6         20   
 15      19         14         12         15         10         19          7   
 16      13          8          9          9         14          8         12   
 17      13         19         12         19         22         19         11   
 18       8          8          7         15          9         11          9   
 19      13          7          8         13          9         14          9   
 21      31         14         13         20          9         18         11   
 22       8          9          7         17         41         11         11   
 23      18         12         18         25         16         18         28   
 24       9          9          8          9         11         16         12   
 25      12         10         13         10          7          9          7   
 26       6         13          8         26         25         21         11   
 27       7         10         11          8          8         10         10   
 29      22         11         14          9         10          6          6   
 30       6         10          7          9         14         11          4   
 31      14         13         13         14         12         11         15   
_______________________
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 920 (1997 Aug 24 - Aug 30)
 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   3.0    16.7        48.1        40.2        4.36        2.89    
ALGO*  6.8    68.8        .179e-01    47.2        4.76        2.70    
ANKR   3.9    138.       -.169        52.3        4.76        2.90    
AREQ   6.9    96.9       -.173        41.2        4.31        2.36    
ASC1    .9    77.2       -.273        66.0        5.00        1.72    
AUCK   2.0    82.1       -.202        40.0        5.52        2.79    
BAHR   5.7    .709        128.        60.2        5.99        3.78    
BRAZ   3.7    197.       -.184        57.2        5.00        3.14    
BRMU   4.0    129.       -.168        38.8        6.76        3.29    
BRUS   2.0    .160        3.93        60.5        5.52        2.80    
CAS1   6.8    10.6        178.        50.7        5.16        1.72    
CASA    .9    18.4        75.8        35.0        4.00        2.83    
CHAT   6.9    115.       -.183        76.9        5.15        2.49    
CHUR   4.0    2.19        .721        36.0        5.52        2.01    
CRO1   5.9    162.       -.173        49.7        5.87        2.14    
DGAR   5.8    157.       -.184        67.2        6.14        1.69    
DRAO   1.0    .966        1.64        37.0        4.00        2.71    
DUBO   1.0    577.       -.169        49.0        4.00        2.35    
FAIR*  6.2    .194        .491e-01    34.6        4.92        2.25    
FLIN    .9    86.6       -.209        46.0        5.00        2.74    
FORT   5.8    .553e+05    287.        44.6        4.85        3.20    
GODE   1.0    .170       -.284        46.0        6.00        3.08    
GOL2*  6.0    49.6       -.292e-01    52.7        4.18        2.18    
GUAM   6.9    131.       -.189        58.3        7.60        2.11    
HARK   3.8    10.8        9.31        52.3        5.00        2.95    
HKLO   2.0    .290e+06    498.        52.5        6.52        2.46    
HOB2   2.0    88.8       -.206        52.5        5.00        2.83    
IISC   2.0    84.7       -.123        72.0        6.00        2.49    
IRKT   4.8    42.2       -.193        64.7        5.00        2.49    
KERG   3.8    .255e+04    27.5          .         5.28        2.35    
KIRU   5.0    10.3        .195        56.4        6.00        2.12    
KIT3   3.7    133.       -.147        59.9        5.00        2.93    
KOKB*  4.4    417.       -.187        78.5        5.83        1.65    
KOSG*  6.9    1.46       -24.0        46.2        5.75        2.68    
KWJ1   2.9    132.       -.223        58.3        6.68        1.82    
LHAS   1.9    .230e+05    4.67        59.2        5.00        2.43    
LMNO    .9    .288e+06    487.        55.0        5.00        2.42    
MAC1   6.7    95.1       -.186        32.2        4.00        2.35    
MAD2   2.0    .206e+04    .573        84.0        6.50        2.01    
MADR*  2.8    .895       -1.01          .         6.40        2.24    
MALI   4.8    119.       -33.2          .         7.61        2.36    
MAS1   6.9    3.19        .502        45.2        4.74        2.53    
MATE   1.0    .215        1.67          .         5.00        3.07    
MCM4   4.9    98.2       -.154        35.2        4.00        1.73    
MDVO   1.8    .519e+05    488.        72.5        7.00        1.77    
MKEA   4.9    .648       -.836e-01    46.4        5.20        2.58    
NLIB   3.9    .107       -.161e-01    48.5        5.77        2.57    
NOTO   1.8    .702e-01    2.28        44.0        6.03        2.70    
NRC1   2.0    .133       -.219        65.0        5.52        3.03    
PENC   1.0    3.85        963.        45.0        6.00        2.85    
PERT   6.9    2.28       -10.1        54.2        5.36        2.64    
PIE1   3.0    .873e-01    .245e-01    49.0        5.36        2.69    
POL2    .9    86.7       -.200        46.0        4.00        2.54    
RCM6   6.0    123.       -.176        57.2        6.85        2.46    
REYK   5.9    77.8       -.175        58.2        5.85        2.21    
SANT*  5.1    .146e+04   -.805        40.3        5.14        1.19    
SELE   1.0    110.       -.110        36.0        4.00        3.22    
SHAO    .9    107.       -.178        61.0        5.00        2.43    
STJO   4.8    166.        .766        38.2        4.88        2.95    
TAEJ    .9    .290e+06    510.        41.0        6.00        2.77    
THU1   1.7    74.2       -.243        47.0        5.00        2.85    
TID2*  6.9    .543       -.243        39.6        5.03        2.68    
USNO    .9    .203       -.216e-01    58.0        5.00        2.87    
USUD   5.8    .743        .139        40.5        5.84        2.74    
VILL    .9    8.25       -.198        70.0        6.00        2.79    
WES2   1.0    1.65        23.7        58.0        4.00        2.81    
WTZR*   .9    2.42       -3.05        64.0        5.00        2.67    
WUHN   4.8    .472e+06   -.306e+04    48.8        5.81        2.83    
YELL*  3.8    .830       -.773        45.5        5.00        1.82    
ZWEN    .9    116.       -.257        63.0        5.00        2.36    
PRN01  6.3    82.0        26.8        52.9        5.72        2.72    
PRN02  6.9    81.1       -396.        54.6        5.31        2.61    
PRN03  6.6    81.9        46.6        55.6        5.00        2.12    
PRN04  6.9    81.9        43.8        52.2        5.16        2.31    
PRN05  6.9    81.1        110.        51.1        5.15        2.35    
PRN06  6.5    82.1       -.499        52.1        5.74        2.27    
PRN07  6.7    80.0        753.        50.6        5.31        2.31    
PRN09  6.9    79.4       -9.41        53.4        5.44        2.27    
PRN10  6.8    80.1        11.9        55.7        5.60        2.13    
PRN14  6.9    82.6        21.5        49.8        5.44        2.46    
PRN15  6.9    3.14        461.        54.4        5.45        2.16    
PRN16  6.9    81.8        25.2        51.8        5.46        2.36    
PRN17  6.8    80.5       -158.        54.8        5.46        2.41    
PRN18  6.7    79.9        3.71        49.4        5.30        2.39    
PRN19  6.9    79.0        189.        51.9        5.00        2.66    
PRN21  6.9    80.1        76.5        52.4        5.45        2.49    
PRN22  6.9    80.0        13.6        48.2        5.48        2.46    
PRN23  6.8    81.7        2.96        51.7        5.60        2.41    
PRN24  6.9    80.6        730.        52.6        5.31        2.37    
PRN25  6.9    81.7       -5.99        47.6        5.30        2.51    
PRN26  6.5    81.1       -9.51        49.9        5.59        2.27    
PRN27  6.9    82.1        40.4        52.0        5.00        2.43    
PRN29  6.7    82.9        282.        49.8        6.01        2.63    
PRN30  6.9    81.6       -77.5        51.2        5.16        2.53    
PRN31  6.7    80.1       -.604        53.4        5.59        2.40    
_______________________
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  8 24   97  8 25   97  8 26   97  8 27   97  8 28   97  8 29   97  8 30
prn   3d rss (cm)
  1     294        338        346        398        425        373        426   
  2     176        194        231        220        242        380        306   
  3     439        271        743        237        533        270        587   
  4     548        158        255        392        212        201        240   
  5     235        227        372        458        855        292        263   
  6     737        891        603        961        916        749       1109   
  7     605        854        390        438        559        392        317   
  9     321        248        282        262        278        346        370   
 10    1112        179        266        271        486        414        461   
 13                           228        464                                    
 14     262        472       2053        282        249        433        537   
 15     292        302        212        253        171        252        235   
 16     444       1271        506        685        372        763       1831   
 17     133        135        134        246        582        164        120   
 18     735        527        397        452        778       1290        289   
 19     491        421        228        277        262        409        639   
 21     216        194        243        203        203        411        245   
 22     622        332        263        352        362        416        333   
 23     443        249        251        500        474        481        262   
 24     296        365        382        654        653        366        564   
 25     238        340        320        314        370        389        305   
 26     223        291        370        239        237        322        288   
 27     453        464        374        410        417        383        304   
 29     335        280        338        250        280        282        254   
 30     121        202        160        193        202        196        158   
 31     198        274        471        398        276        241        246   
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

global:   albh algo ankr areq asc1 auck bahr braz brmu brus cas1 casa chat chur cro1 dgar drao dubo fair flin fort gode gol2 guam hark hklo hob2 iisc irkt kerg kiru kit3 kokb kosg kwj1 lhas lmno mac1 mad2 madr mali mas1 mate mcm4 mdvo mkea nlib noto nrc1 penc pert pie1 pol2 rcm6 reyk sant sele shao stjo taej thu1 tid2 usno usud vill wes2 wtzr wuhn yell zwen

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