Subject: [IGSREPORT-1677] Wk 0794 JPL Analysis Report
From: D C Jefferson
Date: Mon, 10 Apr 1995 16:47:11 PDT

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IGS Electronic Report    Mon Apr 10 16:47:11 PDT 1995      Message Number 1677
******************************************************************************

Author: D C Jefferson
Subject: Wk 0794 JPL Analysis Report

******************************************************************************
JPL ANALYSIS REPORT   GPS-WEEK 0794 (DAYS 85-91, DATES 1995 Mar 26 - Apr 01)
******************************************************************************

Submitted by the JPL IGS/FLINN Analysis Team:

J F Zumberge, 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/0794.  These files have also been sent to the CDDIS.

______________________________________________________________________________
filename               contents
______________________________________________________________________________
jpl07947.sum           This text file.
jpl07947.erp           Earth rotation parameters for GPS week 794.
jpl0794[0-6].sp3       GPS ephemerides for GPS week 794, sp3 format.
______________________________________________________________________________

STRATEGY UPDATE
---------------
Beginning with the analysis of day 085 (Mar 26), we have implemented a number
of changes to our processing strategy.  These modifications are:

 a) Site Selection:  Our core network now consists of 34 sites (previously 32).
    The first 31 are chosen based on required stations (fiducial sites, etc.),
    and global distribution.  We continue to choose the remaining 3 at random, 
    so as to allow all sites the chance to participate in the global solution 
    over time.

 b) Point-Positioning:  Only the central 24 hours of data are used for sites
    anyalyzed via our precise point-positioning method (previously, the full
    30-hour data arc was used).  This is done so that station coordinate and
    clock solutions are less influenced by degradation of orbit and clock
    quality at the end of the 30-hour arc.

 c) Clock Solutions: The acceptable formal error on GPS clock solutions in
    our posted products and those used in point-positioning has changed to 
    0.3 ns (previously 20 ns).  96% of the clock solutions fall into this 
    category. 

 d) Extended Polar Motion:  Beginning this week, earth-fixed orbits correctly 
    reflect the extended polar motion model, implemented beginning Dec 10, 1994
    (day 344).  (Since then, and prior to this week, the extended UTPM model 
    was inadvertantly omitted when transforming orbits from the inertial to
    the earth-fixed frame.  This omission has resulted in 3d-RMS errors of
    about 5 cm.)

 e) Pseudorange:  We have re-instated the regular use of pseudorange data from 
    CASA and DAV1.

GENERAL
-------
Due to potential problems, data from the following stations 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 MATE, ZIMM excluded on day 085 (Mar 26).
WARNING: Data from DRAO excluded on day 087 (Mar 28).
WARNING: Data from GRAZ, MATE excluded on days 088-090 (Mar 29-31).

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 794 (1995 Mar 26 - Apr 01)
     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
49802.50    870  55257   172109  2678    5    6    14     14 34 12 25  412   71 
49803.50   1425  55366   169447  2645    5    6    14     14 34 12 25  422   64 
49804.50   1918  55501   166822  2605    5    6    15     15 34 12 25  378   37 
49805.50   2330  55665   164253  2533    5    6    15     15 34 12 25  331   45 
49806.50   2698  55716   161688  2598    5    5    14     14 34 13 25  320  -11 
49807.50   3004  55742   159069  2639    4    5    13     13 34 13 25  316   -5 
49808.50   3297  55742   156407  2685    4    5    14     14 34 13 25  306    7 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 794:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 794 (1995 Mar 26 - Apr 01)
      95  3 26   95  3 27   95  3 28   95  3 29   95  3 30   95  3 31   95  4  1
prn   3d rss (m)
  1       0.24       0.26       0.24       0.22       0.15       0.10       0.11
  2       0.20       0.22       0.24       0.22       0.20       0.13       0.32
  4       0.17       0.17       0.25       0.24       0.13       0.13       0.28
  5       0.10       0.12       0.12       0.10       0.14       0.14       0.09
  6       0.41       0.42       0.34       0.45       0.24       0.12       0.13
  7       0.30       0.28       0.40       0.52       0.28       0.16       0.26
  9       0.26       0.23       0.30       0.11       0.09       0.16       0.07
 12       0.23       0.17       0.34       0.21       0.09       0.16       0.15
 14       0.12       0.27       0.17       0.27       0.34       0.24       0.25
 15       0.42       0.32       0.32       0.35       0.55       0.33       0.32
 16       0.17       0.13       0.10       0.14       0.11       0.14       0.29
 17       0.16       0.13       0.37       0.21       0.19       0.26       0.21
 18       0.23       0.20       0.31       0.20       0.18       0.10       0.17
 19       0.25       0.27       0.20       0.25       0.18       0.12       0.29
 20       0.14       0.21       0.15       0.15       0.17       0.14       0.08
 21       0.21       0.20       0.16       0.30       0.25       0.14       0.12
 22       0.18       0.25       0.19       0.22       0.21       0.20       0.20
 23       0.17       0.18       0.16       0.34       0.49       0.25       0.13
 24       0.22       0.20       0.13       0.17       0.20       0.20       0.20
 25       0.16       0.19       0.28       0.29       0.32       0.21       0.14
 26       0.28       0.17       0.23       0.19       0.12       0.17       0.09
 27       0.14       0.12       0.21       0.24       0.13       0.20       0.21
 28       0.18       0.11       0.23       0.36       0.32       0.21       0.13
 29       0.16       0.20       0.18       0.16       0.23       0.20       0.29
 31       0.55       0.51       0.55       0.72       0.52       0.23       0.26
_______________________
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 794 (1995 Mar 26 - Apr 01)
 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   1.0    6.38        .989        35.0        3.00        2.77    
ALBH.  4.7    254.       -.346        34.8        5.73        2.72    
ALGO*  7.0    .           .           45.0        3.88        2.76    
AOA1   1.0    178.        .922        72.0        5.00        1.89    
AOA1.  4.7    177.        .776        72.7        7.00        2.19    
AREQ   2.2    .140e+05    .449        48.9        4.18        1.30    
BLYT    .2    .295e+06    455.        60.0        5.00        1.91    
BLYT.   .7    .291e+06    497.        59.2        6.78        2.38    
BOR1.  4.8    2.16       -.337        41.5        5.82        3.03    
BRAN.  5.5    .174e+04    3.48        92.6        7.89        2.86    
BRAZ.  1.5    .385e+05    391.        139.        9.32        1.37    
BRIB.  5.4    .286e+06    307.        63.1        8.72        3.27    
BRMU.  5.5    .457e+07   -.475e+04    43.8        7.54        2.57    
BRUS   1.9    .252        6.55        57.0        4.00        2.61    
BRUS.  3.9    .203        6.45        56.0        6.24        2.53    
CARR   2.9    104.        .894        52.7        4.69        2.52    
CARR.  3.2    94.0        .927        51.3        7.52        2.65    
CAS1   6.7    .169e+06    549.        41.5        4.97        1.40    
CASA   6.6    .588e+07   -.137e+05    59.0        5.77        1.94    
CHIL.   .4    .284e+06    407.        81.8        6.93        1.24    
CIT1.  5.5    109.        .908        47.3        5.16        2.84    
CMBB.  2.8    .290e+06    513.        76.1        10.1        2.74    
CRFP.   .4    .288e+06    390.        62.6        5.98        1.34    
DAV1    .9    5.36        80.8        60.0        5.00        1.25    
DAV1.  3.9    9.28        95.3        67.9        7.88        1.30    
DENC    .5    .292e+06    520.        62.5        4.00        .510    
DENC.   .8    .291e+06    504.        57.3        4.80        .498    
DRAO.  5.1    94.4        .737        48.1        5.77        .945    
EISL   6.8    .681e+07   -.144e+05    43.6        6.14        2.84    
FAIR*  6.8    2.32        .361          .         5.49        1.66    
FARB    .1    .283e+06    390.        41.0        4.00        1.30    
FARB.   .3    .287e+06    454.        41.6        5.81        1.34    
FORT   6.8    .188        1.16        51.9        7.36        2.99    
GODE.  5.5    .199       -1.44        44.8        6.39        2.25    
GOLD*  6.6    .377e+04    40.1          .         3.87        2.07    
GRAZ.  5.4    .769e+04    45.3          .         7.16        2.19    
GUAM   6.8    101.        .900        63.2        6.48        2.04    
HART*  3.7    .251e+05   -130.          .         6.57        2.11    
HARV.  5.5    .847e+07    .140e+05    75.2        7.65        2.44    
HERS.  5.5    .137e+04    11.3          .         6.46        2.04    
IISC    .2    .292e+06    453.        54.9        4.33        1.34    
JOZE.  5.1    17.2        146.        51.5        9.09        3.17    
JPLM   1.9    .698e+05    250.        26.5        3.50        2.69    
JPLM.  4.0    19.0        182.        27.9        5.81        2.92    
KERG   4.8    204.       -29.9          .         5.00        2.24    
KIRU   6.7    3.15        3.28        61.7        6.44        1.70    
KIT3   6.4    132.        .875        140.        4.60        2.69    
KOKB*  6.8    2.67        2.42          .         6.00        2.53    
KOSG*  6.8    5.50        6.55          .         3.74        2.21    
KOUR   4.9    3.54       -3.79          .         8.61        1.95    
KOUR.  1.6    1.90       -4.09          .         11.5        1.82    
LAMA.  4.7    .478e+04    2.13          .         6.32        2.27    
LBCH   6.7    774.        .844        73.2        4.81        2.53    
LMNO    .5    .291e+06    494.        56.0        4.00        1.00    
LMNO.  3.1    .288e+06    491.        58.8        6.41        1.13    
MADR*  6.6    .105       -1.85          .         4.87        2.44    
MAS1   2.9    8.28       -3.27        64.1        4.00        2.53    
MAS1.  3.2    7.45       -2.87        68.0        7.00        2.83    
MATE.  3.9    2.09        1.00          .         6.13        .435    
MATH    .6    .305e+06    541.        42.0        5.00        2.32    
MATH.  2.5    .281e+06    577.        47.8        6.89        2.65    
MCM4   6.6    84.5        .908          .         5.01        1.45    
MDO1.  5.5    .525        .373e-01    36.1        6.76        2.41    
METS    .6    .689e-01   -3.30          .         4.00        1.68    
METS.  3.1    .391       -3.29          .         6.25        1.96    
MONP.   .7    .292e+06    540.        77.0        5.60        2.18    
NLIB   1.0    .888e-01    1.22        40.0        4.00        2.88    
NLIB.  4.7    .531e-01    1.13        40.2        6.63        2.61    
NYAL.  5.1    20.1        1.15          .         8.07        1.60    
OAT2.  5.4    309.        .886        39.7        5.59        2.82    
OHIG   5.6    .141e+07   -299.        56.1        5.10        1.62    
ONSA.  5.3    .996e+04   -1.64        44.6        6.00        1.77    
PAMA   4.1    41.0        .103          .         11.8        1.12    
PERT   2.4    7.39        140.        53.2        5.44        3.05    
PIE1.  5.5    .853e-01   -3.91        37.1        6.15        2.37    
PIN1.   .7    .285e+06    564.        50.7        6.16        1.91    
PLTC.  1.8    .290e+06    492.        54.2        4.61        .650    
POTS.  5.4    376.        .903        62.4        6.74        2.05    
PVEP.  5.1    .290e+06    504.        116.        12.0        2.63    
QUIN.  5.5    1.84       -126.        54.1        7.08        2.22    
RCM5   6.9    .828        .909          .         5.53        2.73    
SANT*  6.3    .142       -3.87          .         5.31        2.44    
SHAO   6.8    1.31        1.40        42.6        4.00        2.38    
SIO3.  2.8    .287e+06    532.        69.9        7.04        3.15    
STJO   6.8    .347e+05    188.        115.        4.30        2.59    
TAIW   1.0    4.01        118.          .         5.00        2.42    
TAIW.  3.6    5.59        327.          .         7.68        1.79    
TIDB*  6.7    .351        .296          .         4.87        2.51    
TMGO.  4.9    .164e+04    .676        138.        12.5        .398    
TRAK.   .3    .286e+06    565.        81.8        8.89        1.71    
TROM*  6.8    .132e+06    724.          .         5.15        1.36    
TSKB   1.8    1.08        382.        51.5        4.00        2.86    
TSKB.  3.8    .828        382.        57.1        8.34        2.81    
UCLP.  5.5    83.6        .917        40.1        5.74        2.88    
UPAD.   .4    .275e+06    398.        83.2        7.32        1.10    
USC1.  5.5    121.        .897        58.9        7.15        2.53    
USUD.  5.5    .701        .768        39.0        7.65        2.31    
VILL   6.8    5.07       -.684e-01    75.9        4.31        3.00    
VNDP    .1    .298e+06    544.        54.0        4.00        .977    
VNDP.   .3    .296e+06    472.        54.2        5.04        1.37    
WEST.  5.5    .127        3.15        55.0        5.73        2.52    
WETT*  5.2    2.78        3.64          .         4.22        1.92    
WHI1.  3.5    .122e+06    5.05        49.8        5.84        1.40    
WLSN.  5.5    96.2        .932        67.1        8.86        2.19    
YAR1*  6.1    189.        1.07          .         4.32        2.25    
YELL*  6.5    .353       -.939        47.7        4.61        1.26    
ZIMM.   .9    .291e+06    492.        63.0        7.27        1.83    
PRN01  6.5    84.4       -8.25        54.7        6.48        2.04    
PRN02  6.8    82.2       -153.        65.7        6.45        1.99    
PRN04  6.9    83.3        19.7        63.1        6.00        1.65    
PRN05  6.9    79.0        98.6        57.8        6.00        1.83    
PRN06  6.5    82.4        316.        54.3        6.30        2.00    
PRN07  6.6    81.0        704.        66.4        6.86        1.75    
PRN09  6.9    80.2       -24.9        63.4        6.00        1.54    
PRN12  6.9    .749       -456.        81.4        5.89        1.91    
PRN14  6.9    80.3        9.56        57.2        6.16        1.89    
PRN15  6.7    2.92        173.        67.4        6.81        1.68    
PRN16  6.8    82.1       -82.3        68.2        6.60        1.78    
PRN17  6.8    83.7       -76.5        60.2        6.47        2.09    
PRN18  6.5    80.2       -7.38        62.8        6.31        1.96    
PRN19  6.8    81.4        311.        67.4        6.00        2.11    
PRN20  6.8    79.8        184.        60.6        6.00        1.87    
PRN21  6.8    81.9       -14.0        59.5        6.31        2.21    
PRN22  6.8    79.8        206.        64.9        6.87        1.91    
PRN23  6.8    79.6        8.39        53.6        6.15        2.20    
PRN24  6.9    82.6        626.        57.3        6.47        1.81    
PRN25  6.7    80.4        1.17        55.3        6.72        2.03    
PRN26  6.6    82.1       -73.8        68.7        7.00        1.81    
PRN27  6.8    81.9        26.1        68.3        6.45        2.18    
PRN28  6.3    2.44        4.76        82.4        6.33        2.11    
PRN29  6.5    79.9        8.67        60.1        6.46        1.91    
PRN31  6.5    81.6        83.5        71.2        6.87        2.07    
_______________________
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
      95  3 26   95  3 27   95  3 28   95  3 29   95  3 30   95  3 31   95  4  1
prn   3d rss (m)
  1       9.6       10.0        8.7        7.0        7.5        6.8        7.3 
  2       4.0        6.7        6.5        6.1        7.4        6.1        6.7 
  4       2.8        3.2        3.1        3.2        3.2        3.6        4.9 
  5       4.5        5.0        4.5        4.7        4.2        4.6        5.2 
  6      11.6        9.8       10.5        8.7       12.2       11.8       12.0 
  7       6.4        7.5        7.1        7.2        7.4        8.6        8.1 
  9       2.7        3.0        2.7        2.7        2.9        2.8        3.5 
 12       2.2        2.0        2.9        4.2        3.6        3.7        3.3 
 14       5.0        5.8        6.2        6.8        6.8        5.5        5.6 
 15       3.2        3.4        3.3        3.2        3.4        3.8        3.8 
 16      11.5       10.4        8.7        6.6        8.2       11.2        5.9 
 17       3.8        3.7        4.3        4.1        4.1        3.8        3.9 
 18      10.7       10.5        9.8        9.9        9.0       10.0       15.1 
 19       2.0        2.2        2.8        3.5        5.9        4.2        3.4 
 20       4.7        4.9        4.0        4.3        4.7        4.1        3.8 
 21       5.2        7.3        8.9        8.8        8.3        5.1        2.9 
 22       5.2        6.0        4.2        5.4        6.6        6.0        7.1 
 23      12.6       14.7       14.3       14.7       10.1       14.5       13.3 
 24       2.7        2.7        3.1        3.2        3.7        4.5        4.8 
 25       3.1        4.1        3.7        4.7        4.5        5.2        5.2 
 26       5.0        6.1        5.8        7.8        5.0        7.1        6.7 
 27       3.3        4.2        4.3        4.9        5.0        5.7        5.4 
 28       3.6        4.3        4.5        5.5        6.0        4.5        4.6 
 29       8.3        9.9       11.4       10.3        9.4        9.7       11.0 
 31       4.8        4.2        5.1        5.0        5.6        6.4        6.0 
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

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