Subject: [IGSREPORT-4707] Wk 0947 JPL Analysis Report
From: D C Jefferson
Date: Tue, 17 Mar 1998 17:33:37 PST

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IGS Electronic Report    Tue Mar 17 17:33:37 PST 1998      Message Number 4707
******************************************************************************

Author: D C Jefferson
Subject: Wk 0947 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0947 (DAYS 60-66, DATES 1998 Mar 01 - Mar 07)
******************************************************************************

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/0947.  These files (except for *.tro) have also
been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl09477.sum         This text file.
jpl09477.erp         Earth rotation parameters for GPS week 947.
jpl09477.snx         Ground station coordinates for GPS week 947, SINEX format.
jpl0947[0-6].sp3     GPS ephemerides for GPS week 947, sp3 format.
jpl0947[0-6].tro     Ground station troposphere estimates for GPS week 947.
______________________________________________________________________________

Median Orbit Repeatability (see table below): 9.0 cm

STRATEGY UPDATE
---------------
Beginning day 060 (and the same for the JPL rapid orbit), we make use of
ITRF96 coordinates and velocities for fiducial (constrained) stations in
our global solutions.  Monument coordinates and velocities are taken from
ftp://lareg.ensg.ign.fr/incoming/ITRF96_IGS_RS47.SNX (now available at
ftp://igscb.jpl.nasa.gov/igscb/station/coord/ITRF96_IGS_RS47.SNX.Z), and
antenna heights from ftp://igscb/igscb/station/general/igs.snx.  (Antenna
reference point to L1 and L2 phase centers are from ftp://igscb/igscb/station/
eneral/igs_01.pcv.)

As we use only 37 stations in our daily processing, we select a subset of the
47 sites designated by the IGS as fiducials in the following manner:

  a) Automatically include and constrain the following 22 sites when
     available: ALGO DAV1 FAIR FORT GOL2 HARK IRKT KERG KIT3 KOKB KWJ1
     MAC1 MAD2 MALI OHIG ONSA SANT TID2 TSKB WTZR YAR1 YELL.

  b) Allow the remaining 15 sites to be selected normally, based on
     geographic distribution.  Constrain any of these that are IGS fiducials
     to their ITRF96 values.

The jpl.acn file at the IGS CBIS has been updated to reflect these changes.
Orbits, Earth orientation, SINEX station coordinates, and daily transformation
files are now in ITRF96.  Note that at the present time, we continue to use the
names GOL2, HARK, MAD2, MAS1, and TID2 instead of GOLD, HART, MADR, MASP, and
TIDB for the TurboRogue receivers at those locations.

GENERAL
-------
We continue to exclude all data from PRN13 and deweight all data from PRN08
this week.  We should mention that, following IGS guidelines, as of week 945,
our sp3 files include solutions for all satellites used in the global analyses.
This means that satellites which were previously excluded for having large
formal errors (like PRN08, due to deweighting) are now represented in our sp3
files with appropriate sp3 accuracy codes.  

According to the file nanu1998.mes obtained from the IGS CBIS, PRN31 was
unusable on day 066.  Data from this satellite did not meet our initial
convergence criteria on this day and have been excluded from this day's
processing accordingly.

Beginning this week we add four new 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)
BILL (Temecula CA, USA)            -2420444.7749  -4737162.4083   3507853.8841
SCIP (San Clemente Isl. CA, USA)   -2556587.4388  -4711014.0991   3446241.4327
SIO4 (Scripps4, La Jolla CA, USA)  -2455541.6725  -4767225.1106   3441625.9004
WIDC (Wide Canyon CA, USA)         -2354891.5014  -4745575.8899   3540667.6009

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 060, 061, and 063-066.
WARNING: TID2 (not NRC1) used as reference clock day 062.
WARNING: Data from PRN08 deweighted the entire GPS week 947.
WARNING: Data from PRN13 excluded the entire GPS week 947.
WARNING: Data from PRN31 excluded day 066.
WARNING: Data from KELY, ONSA excluded day 061.
WARNING: Data from NANO, ONSA excluded day 062.
WARNING: Data from ONSA, YAKZ excluded day 063.
WARNING: Data from CHUR, NICO excluded day 064.
WARNING: Data from SANT excluded day 065.

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 947 (1998 Mar 01 - Mar 07)
     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
50873.50  -5982  19407    95193  2222    3    3    10     10 37 22 26 -145  150 
50874.50  -6102  19570    92985  2193    2    3    10     10 37 23 26 -180  154 
50875.50  -6247  19767    90821  2136    2    3    10     10 37 23 26 -175  141 
50876.50  -6416  19942    88683  2140    2    3    10     10 37 23 26 -212  149 
50877.50  -6595  20138    86537  2152    2    3    10     10 37 24 26 -211  169 
50878.50  -6745  20323    84366  2189    2    2     9      9 37 24 26 -197  167 
50879.50  -6897  20531    82174  2196    2    3    10     10 37 24 25 -213  206 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 947:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 947 (1998 Mar 01 - Mar 07)
      98  3  1   98  3  2   98  3  3   98  3  4   98  3  5   98  3  6   98  3  7
prn   3d rss (cm)
  1       9          8          8          8          8         10          8   
  2      18         11         12          9         10         17         13   
  3       7          9          8         12          6          6         20   
  4       6          7          7          7         10          8          4   
  5      12          7          7         11          9          4          6   
  6      10         10         11         14          9          7          8   
  7       8         14          9         10          6          8         10   
  8      56         46         51         93         62         55         54   
  9      17          7          6          8         12          6         11   
 10       8         11         14          6         13         11          7   
 14       8          7          9          9          9          9          9   
 15      23          8          4          6          8         11         14   
 16       9          7         12          9         10          7          7   
 17      14         11          6          8          9         17         12   
 18       9          9          7         12         16          6          7   
 19      27         24         28         25         17         12         11   
 21      17         12          9          7          6          9         10   
 22      10         10         14         13          8          5          7   
 23      13         10         16         12          9          9          8   
 24      12         12          6         10         18         13         19   
 25       5          4          6          6          6          4         10   
 26      10         13         14         20         16         12         11   
 27      22         19         11         13         14         13         11   
 29       6          5          6          5          6          5          5   
 30       7          5         18         27          7          4          6   
 31       9         15         11         20         17         13              
_______________________
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 947 (1998 Mar 01 - Mar 07)
 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*  6.7    .149e+04    2.26        56.2        4.31        2.91    
AREQ*  3.0    95.6       -.230        59.4        5.36        2.02    
ASC1   6.1    515.       -.199        68.4        5.00        1.54    
AUCK   5.0    .177e+07   -53.6        41.0        4.63        2.67    
BAHR   7.0    2.64        233.        45.6        4.73        2.91    
BOGT   1.5    138.       -.237        64.7        6.43        1.71    
BRUS   2.0    .523        .814        61.0        5.00        2.84    
CAS1   2.8    .699e+07   -.152e+05    38.7        6.38        1.02    
CHAT   1.0    111.       -.239        79.0        5.00        2.99    
COCO   1.9    82.2       -.113e+05    47.4        5.00        2.73    
CRO1   2.0    147.       -.814e-01    54.0        4.52        2.00    
DAV1*  6.9    138.       -.179          .         4.74        1.18    
DGAR   6.6    445.       -.181        66.3        6.03        1.53    
EISL   7.0    135.       -.190        53.6        5.90        2.69    
FAIR*  7.0    20.0       -.158        35.7        4.31        2.27    
FORT*  6.8    .214       -.321        76.1        6.86        1.57    
GOL2*  6.6    102.        .551        61.7        4.40        2.01    
GUAM*  7.0    118.       -.204        62.7        6.03        1.97    
HARK*  6.9    10.5       -.358        55.7        5.46        2.51    
HARV   1.0    .849e+07    .107e+05    71.0        5.00        2.66    
IISC    .9    115.       -.230        79.0        5.00        1.69    
IRKT*  6.8    .335e+05   -33.8        56.7        4.61        2.49    
KERG*  5.8    .205e+04    .192e+04      .         5.51        2.28    
KIT3*  2.8    130.       -.244        61.2        4.33        3.24    
KOKB*  7.0    .213       -17.7        69.2        5.16        2.55    
KWJ1*  6.9    118.       -.190        71.2        6.18        1.98    
LHAS*  6.0    89.8       -.179        49.6        4.69        2.73    
LPGS   3.0    415.       -.242        59.4        5.69        2.71    
MAC1*  5.7    83.5       -.176        47.6        4.50        2.18    
MAD2*  6.5    350.        .190        58.5        5.00        1.93    
MALI*  5.8    .202e+05   -38.7        87.6        7.00        2.05    
MCM4   5.0    93.8       -.163        42.9        4.82        1.29    
MDVO   3.9    .160e+05    697.        68.0        6.00        1.79    
MKEA   6.0    .679e-01    1.10        56.4        4.85        2.55    
MOIN   5.0    113.       -.170        73.2        6.62        1.94    
OHIG*  3.2    .173e+07   -397.        53.4        4.00        .941    
ONSA*  3.0    .211        1.77        38.7        4.00        2.19    
PERT*  1.9    2.66       -2.80        52.0        5.49        2.49    
PIE1*  1.0    .679e-01   -.247        48.0        4.00        2.58    
POL2   1.0    81.9       -.234        38.0        4.00        2.65    
REYK   2.0    81.6       -.700e-01    58.6        6.00        2.20    
SANT*  3.9    .165e+04    1.27        45.1        4.65        1.21    
TAHI   5.1    191.       -.231        79.5        6.27        2.30    
THU1*  5.9    72.6       -.180        44.7        5.69        2.09    
TID2*  7.0    8.83       -.341        35.1        6.05        2.33    
TSKB*  7.0    1.66       -1.78        46.9        4.15        3.20    
USNO   6.3    .           .           55.5        5.00        2.78    
USUD   7.0    .786       -1.02        45.3        4.00        2.82    
WTZR*  7.0    .880e-01    1.80        64.6        4.74        2.73    
WUHN   3.9    6.41       -677.        47.5        5.06        2.46    
YAR1*  7.0    87.1       -.188        38.6        4.61        2.21    
YELL*  6.7    25.9        1.38        44.3        4.61        1.37    
PRN01  6.9    82.7        41.0        54.2        5.00        2.19    
PRN02  7.0    85.4       -461.        59.3        5.00        2.16    
PRN03  7.0    79.8        105.        55.5        5.00        2.20    
PRN04  7.0    81.3        14.7        58.4        5.00        2.13    
PRN05  7.0    81.8        139.        53.9        5.00        2.29    
PRN06  7.0    82.3       -.501        57.0        5.00        2.00    
PRN07  7.0    81.3        771.        58.7        5.00        2.17    
PRN09  7.0    81.1       -32.4        57.1        5.00        2.09    
PRN10  7.0    80.2        19.0        57.6        5.00        1.98    
PRN14  7.0    78.8        27.1        51.6        5.00        2.42    
PRN15  7.0    3.10        530.        57.4        5.00        2.25    
PRN16  7.0    83.7        51.5        56.9        5.00        2.36    
PRN17  7.0    80.8       -175.        58.0        5.15        1.87    
PRN18  6.9    80.4        11.3        57.0        5.00        2.06    
PRN19  7.0    80.7        382.        59.4        5.00        1.95    
PRN21  7.0    80.2        26.3        55.6        5.00        2.03    
PRN22  7.0    79.9        49.6        54.6        5.15        2.32    
PRN23  7.0    80.8        10.4        53.8        5.15        2.22    
PRN24  7.0    81.5        802.        64.8        5.30        2.41    
PRN25  7.0    81.5       -7.06        53.6        5.16        2.06    
PRN26  6.9    81.8       -103.        55.9        5.00        1.97    
PRN27  6.9    82.6        19.7        59.0        4.88        2.09    
PRN29  6.9    84.4        260.        54.1        5.00        2.34    
PRN30  7.0    81.3       -28.2        57.7        5.00        2.24    
PRN31  6.0    79.4        1.56        58.0        5.18        2.23    
_______________________
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  3  1   98  3  2   98  3  3   98  3  4   98  3  5   98  3  6   98  3  7
prn   3d rss (cm)
  1     361        625        698        396        287        316        359   
  2     316        184        356        212        252        401        184   
  3     252        381        472        426        238        257        342   
  4     239        278        583        457        299        639        372   
  5     322        183        276        276        325        346        494   
  6     603        732        556        536        597        618        673   
  7     335        264        584        259        230        337        268   
  8     667        658        502        591        519        646        459   
  9     216        457        234        174        179        167        226   
 10     345        465        489        428        418        310        258   
 14     365        694        343        643        439        402        918   
 15     593        419        227        256        268        285        212   
 16    1330        529        234        589        499        605        382   
 17     212        322        434        409        307        287        453   
 18     451        476        301       1034        351        468        546   
 19     640        289        233        244        889        338        283   
 21     497        330        398        631        562        294        771   
 22     365        452        467        641        868        397        401   
 23     864        431        536        576        669        534        324   
 24     186        440        460        307        192        497        352   
 25     521        180        237        264        182        272        478   
 26     281        495        401        533        435        519        924   
 27     293        240        400        274        254        420        325   
 29     637        678        630        454        282        393        444   
 30     208        309        431        213        247        375        399   
 31     232        347        540        424        252        270              
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

global:   algo areq asc1 auck bahr bogt brus cas1 chat coco cro1 dav1 dgar eisl fair fort gol2 guam hark harv iisc irkt kerg kit3 kokb kwj1 lhas lpgs mac1 mad2 mali mcm4 mdvo mkea moin ohig onsa pert pie1 pol2 reyk sant tahi thu1 tid2 tskb usno usud wtzr wuhn yar1 yell

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