Subject: [IGSREPORT-4161] Wk 0922 JPL Analysis Report
From: D C Jefferson
Date: Tue, 23 Sep 1997 14:45:44 PDT

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IGS Electronic Report    Tue Sep 23 14:45:44 PDT 1997      Message Number 4161
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Author: D C Jefferson
Subject: Wk 0922 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0922 (DAYS 250-256, DATES 1997 Sep 07 - Sep 13)
******************************************************************************

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 (128.149.70.41),
directory pub/jpligsac/0922.  These files (except for *.tro) have also
been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl09227.sum         This text file.
jpl09227.erp         Earth rotation parameters for GPS week 922.
jpl09227.snx         Ground station coordinates for GPS week 922, SINEX format.
jpl0922[0-6].sp3     GPS ephemerides for GPS week 922, sp3 format.
jpl0922[0-6].tro     Ground station troposphere estimates for GPS week 922.
______________________________________________________________________________

Median Orbit Repeatability (see table below): 9.0 cm

According to the file nanu1997.mes obtained from the IGS CBIS, PRN01 was
unusable on days 254 and 255 for maintenance/repositioning.  Data from this
satellite did not meet our initial convergence criteria on neither of these
days and have been excluded accordingly.

Although used in the analyses of days 250-255, we continue to deweight data
from PRN13.  Data from this satellite was mismodeled on day 256 and was not
used at all on this day.  This satellite does not appear in any of the orbit
products for this week.

Beginning this week we add six 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)
KSTU (Krasnoyarsk, Russia)           -174281.7343   3571333.0971   5264196.1530
NICO (Nicosia, Cyprus)               4359415.9513   2874117.0641   3650777.7999
NTUS (Singapore)                    -1508022.7839   6195576.8795    148799.4829
PRDS (Calgary, Alberta, Canada)     -1659602.8290  -3676725.7540   4925493.5910
SCH2 (Schefferville, Quebec, Canada) 1448636.9320  -3385243.6730   5191046.9500
TORP (Torrance, California, USA)    -2517894.2431  -4670260.2923   3527827.5211

A clock reset (large discontinuity) of about 42 microseconds was detected for
PRN27 at approximately 01:35 UT on day 252.

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 PRN13 deweighted days 250-255; excluded day 256.
WARNING: Data from PRN01 excluded days 254 and 255 due to a manuever.
WARNING: Data from CRO1, CSN1, SNI1 excluded day 250.
WARNING: Data from CSN1, DAM2, KELY, POL2 excluded day 251.
WARNING: Data from CSN1, DAM2, REYK, SANT, SNI1 excluded day 252.
WARNING: Data from CSN1, DAM2 excluded day 253.
WARNING: Data from LEEP, USNA excluded day 255.

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 922 (1997 Sep 07 - Sep 13)
     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
50698.50  20876  44237   434070  1694    3    3     8      8 37 10 26  144 -277 
50699.50  21043  43957   432401  1643    3    4     8      8 37 10 26  194 -264 
50700.50  21187  43728   430777  1606    4    4     9      9 37  9 26  129 -291 
50701.50  21342  43465   429166  1615    3    4     9      9 37 10 26  143 -256 
50702.50  21483  43192   427516  1685    4    4     9      9 37 10 25  179 -297 
50703.50  21620  42931   425832  1684    4    4     9      9 37 10 25  156 -241 
50704.50  21725  42716   424139  1702    4    4     9      9 37  8 25  129 -217 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 922:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 922 (1997 Sep 07 - Sep 13)
      97  9  7   97  9  8   97  9  9   97  9 10   97  9 11   97  9 12   97  9 13
prn   3d rss (cm)
  1       8          9          8         11                                5   
  2       8          9          7          8          9          5          8   
  3      25         38         35         39         29         31         20   
  4       6          6          4          6         11          6          7   
  5       5          9          6          6          9         12          9   
  6       7          8         12         12          8         12          8   
  7      10          8          8          5          9          5          9   
  9       6         10         11         12          8         11          6   
 10       7          8          7          4         12         11          8   
 13      63         65         63         60        307        444              
 14       6          9         10          4          5          6          4   
 15       7          9         11          9         11         13         13   
 16      11         11          8          7          8          7          9   
 17      10         12         11          8         18         23         20   
 18       9         20         10          8          6          9          9   
 19      12         23         15         16         13         10         17   
 21      12          6         10          8          8          6         10   
 22       9         12          7         10          7         10          8   
 23      19          9         21         19         27         13         19   
 24       6          9          5          7          7         11          5   
 25       5          7          6         10         10         12          6   
 26      11         20          5          6         10          9          4   
 27       6         21         19          8          9          5          9   
 29       7          9         10          9          8         10          6   
 30       4          7          6         10          6          7          6   
 31      10         12         18         14         19         12         20   
_______________________
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 922 (1997 Sep 07 - Sep 13)
 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*  7.2    .           .           47.9        4.16        3.11    
AREQ   2.9    98.2       -1.28        50.9        4.00        2.11    
ASC1   4.8    114.       -1.25        67.9        4.82        1.78    
AUCK   1.0    93.0       -1.49        38.0        4.00        2.80    
BAHR   7.0    .523        127.        62.0        5.21        3.77    
BRAZ   1.9    133.       -1.39        62.0        5.54        2.92    
CAS1   6.9    15.5        174.        47.0        5.45        1.62    
CASA   4.0    25.0        359.        37.7        4.78        2.92    
CHAT   6.0    111.       -1.17        77.2        5.00        2.55    
CRO1   6.0    947.       -1.25        52.9        5.39        2.01    
DGAR   1.6    955.       -1.05        67.6        7.45        1.69    
DRAO   1.0    .586        1.24        33.0        4.00        3.19    
FAIR*  6.4    .143e+06   -75.4        34.9        4.85        2.17    
FLIN   5.0    84.9       -1.12        48.4        5.04        2.79    
FORT   4.0    .126       -5.88        49.0        5.52        2.92    
GALA   4.9    721.       -1.31        70.3        4.65        1.75    
GOL2*  7.0    .107       -.606        41.8        4.74        2.20    
GUAM   5.8    122.       -1.24        64.0        7.52        2.05    
HARK   4.8    56.0       -1.64        54.2        4.23        2.66    
HKLO    .9    .288e+06    499.        49.0        7.00        3.14    
HOB2   1.0    83.9       -1.48        45.0        4.00        2.78    
IISC   4.0    90.0       -1.36        77.8        5.77        2.34    
IRKT   6.9    26.4       -1.31        59.9        4.87        2.18    
KELY    .7    .290e+04   -2.45          .         6.00        .930    
KERG   6.9    .202e+05    147.          .         4.89        2.47    
KIRU   1.0    4.42       -4.95        55.0        6.00        2.45    
KIT3   2.5    125.       -1.09        70.1        4.39        2.80    
KOKB*  6.8    75.0       -1.23        81.8        5.61        1.71    
KOSG*  7.0    .292e+04   -11.5        44.3        4.77        2.62    
KOUR   1.0    7.50       -1.67          .         7.00        2.50    
KWJ1   7.0    431.       -1.22        67.6        6.74        1.63    
LHAS   6.8    108.       -1.22        59.3        4.88        2.54    
LPGS    .9    148.       -1.09        58.0        5.00        2.27    
MAC1   5.8    91.4       -1.16        30.6        4.22        2.16    
MAD2   5.0    .127e+04    2.57        84.0        5.81        2.27    
MADR*  7.0    2.32       -1.94          .         5.60        2.26    
MALI   5.9    116.       -15.6          .         7.00        2.13    
MAS1   2.0    59.0       -.712        48.5        4.00        2.57    
MCM4   7.0    98.3       -1.22        36.0        4.45        1.47    
MDVO   2.9    .338e+04    661.        73.3        7.00        1.98    
MKEA   7.0    .863e-01   -1.22        51.8        5.00        2.67    
NICO   2.0    172.       -1.07        37.5        4.53        2.34    
NOTO   1.0    .114       -.399        42.0        5.00        2.95    
ONSA   2.0    .123       -3.71        54.7        5.53        2.33    
PERT   7.0    2.36       -12.8        56.2        5.24        2.90    
POL2   1.0    89.1       -1.21        42.0        3.00        2.50    
RCM6   2.0    161.       -1.23        60.2        6.08        2.40    
REYK   4.8    537.       -1.24        57.9        6.45        1.69    
SANT*  4.5    .158e+04   -.712        46.5        5.00        1.34    
SELE   3.0    115.       -1.31        34.7        3.36        3.26    
SHAO   1.0    95.2       -1.49        58.0        6.00        2.55    
STJO   4.0    3.91        .182        55.2        4.83        2.64    
TAHI   2.8    205.       -1.24        80.8        5.69        2.35    
TID2*  7.0    9.59       -1.24        41.6        5.30        2.66    
TOUL   2.0    615.       -.706        52.0        5.00        2.21    
USUD   6.0    1.67       -.838        42.0        6.18        2.67    
WTZR*  5.9    11.0       -4.24        61.5        5.02        2.68    
WUHN   5.9    8.40       -.469e+04    50.5        5.36        2.82    
YELL*  6.0    .361       -2.35        46.0        5.00        1.57    
PRN01  4.8    80.8        26.8        57.3        5.23        2.37    
PRN02  7.0    81.9       -402.        59.2        5.00        2.45    
PRN03  6.8    82.8        49.9        59.9        5.00        2.07    
PRN04  7.0    80.9        45.0        57.6        5.46        2.41    
PRN05  7.0    79.7        111.        51.6        5.00        2.42    
PRN06  7.0    79.4       -1.55        54.4        5.31        2.27    
PRN07  7.0    80.6        753.        53.2        5.16        2.21    
PRN09  7.0    81.7       -12.0        58.4        5.16        2.22    
PRN10  7.0    80.2        11.4        56.3        5.30        2.21    
PRN14  7.0    82.0        20.8        51.4        5.31        2.36    
PRN15  7.0    4.13        465.        59.7        5.00        2.11    
PRN16  7.0    80.9        26.0        54.8        5.30        2.35    
PRN17  7.0    79.5       -160.        58.5        5.16        2.23    
PRN18  6.9    80.1        3.08        53.7        5.00        2.23    
PRN19  7.0    80.8        212.        55.6        5.15        2.46    
PRN21  7.0    80.0        78.4        57.5        5.15        2.32    
PRN22  7.0    82.4        15.7        53.6        5.00        2.26    
PRN23  7.0    81.4        2.41        61.5        5.31        2.25    
PRN24  7.0    83.7        747.        57.6        5.45        2.28    
PRN25  7.0    80.1       -7.18        52.1        5.00        2.24    
PRN26  6.8    83.6       -15.8        54.1        5.00        2.08    
PRN27  6.9    .401e+04    13.9        55.8        5.00        2.47    
PRN29  6.9    81.6        285.        52.0        5.00        2.55    
PRN30  7.0    81.5       -81.4        54.7        5.16        2.59    
PRN31  7.0    83.4       -1.72        55.3        5.00        2.15    
_______________________
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  9  7   97  9  8   97  9  9   97  9 10   97  9 11   97  9 12   97  9 13
prn   3d rss (cm)
  1     395        312        351        291                              358   
  2     153        331        532        239        229        380        315   
  3     385        519        334        273        257        240        244   
  4     246        241        169        153        186        224        207   
  5     263        194        294        264        299        323        377   
  6    1123        740        682        915        930        655        596   
  7     329        460        246        319        434        308        340   
  9     196        252        335        397        203        222        193   
 10     419        174        259        657        694        494        334   
 13     171        340        301        435        207        523              
 14     244        358        386        618        886        498        340   
 15     202        178        309        453        468        216        273   
 16     190        748       1927       1051        294        304        188   
 17     531        457        323        140        207        141        134   
 18     509        686        447        419        522        518        469   
 19     254        206        668        931        249        320        366   
 21     326        130        272        663        179        182        757   
 22     448        534        388        331        629        558        505   
 23     889        673        574        871        832        399        591   
 24     431        412        303        371        288        348        452   
 25     266        332        486        298        686        602        311   
 26     202        255        454        466        325        337        350   
 27     396        326        617        527        394        349        586   
 29     277        253        332        509        325        559        438   
 30     200        351        490        237        166        276        261   
 31     191        226        203        387        312        310        340   
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

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