Subject: [IGSREPORT-1267] Wk 0767 JPL Analysis Report
From: D.C. Jefferson, Y.E. Bar-Sever, J.F. Zumberge
Date: Wed, 5 Oct 1994 10:20:08 PDT

******************************************************************************
IGS Electronic Report    Wed Oct  5 10:20:08 PDT 1994      Message Number 1267
******************************************************************************

Author: D.C. Jefferson, Y.E. Bar-Sever, J.F. Zumberge
Subject: Wk 0767 JPL Analysis Report

******************************************************************************
JPL ANALYSIS REPORT   GPS-WEEK 0767 (DAYS 261-267, DATES 1994 Sep 18 - Sep 24)
******************************************************************************

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/0767.  These files have also been sent to the CDDIS.

______________________________________________________________________________
filename               contents
______________________________________________________________________________
jpl07677.sum           This text file.
jpl07677.erp           Earth rotation parameters for GPS week 767.
jpl0767[0-6].sp3       GPS ephemerides for GPS week 767, sp3 format.
______________________________________________________________________________

STRATEGY UPDATE

Global Analysis and Point-Positioning
--------------------------------------
Beginning with the analysis of day 263 (Sep 20), we include data from no
more than 32 stations in the solution which yields global parameters.
The sites are chosen in the following way:  First, we define a set of
"global sites" to consist of the IGS fiducials.  From the list of
available stations not in the global sites set, we determine the site
with maximal distance to the nearest global site.  The set of global
sites is then expanded to include this site.  The procedure is
continued until we have 32 global sites.  (We have chosen 32 based on
the current status of the global network, and may increase it as new
sites become available.)

Sites not in the "global" category are then analyzed, each in turn, by
fixing the values of satellite parameters and earth orientation to those
determined in the global solution.  This "precise point positioning" is
very efficient, in that it does not require simultaneous analysis of data
from different sites.  Up to 17 sites were analyzed in this manner on days
263-267 (Sep 20-24).

GPS Yaw Attitude Model
----------------------
Also beginning day 263, the new GPS yaw attitude model has been added
to the measurement models.  A yaw-rate parameter is estimated twice
per revolution, once for the midnight turn and once for the noon turn
(if any).  For shadow events longer than 19 minutes, all measurements
are discarded from the shadow exit until 30 minutes thereafter.
Stochastic X and Y accelerations are also estimated for the eclipsing
satellites every hour with correlation time constant of 4 hours and 10%
a-priori sigma. (Days 264 and 265, Sep 21-22, were processed with X, Y,
and Z stochastic accelerations at 1% a-priori sigma.)  To make these changes
more effective, we have also changed our data decimation interval from 7.5
minutes to 5 minutes.

A text file containing the estimated yaw rates is published in the
aforementioned anonymous ftp area under the directory for the appropriate day.
A binary file containing the actual yaw attitudes of the eclipsing satellites
is published in pub/gipsy_products/1994/orbits.  Refer to IGS mail 591 for
background on the GPS yaw attitude model and for location of utilities to
create, read, and dump the GPS attitude file.

GENERAL

Beginning with day 266 (Sep23), we include data from PERT (Perth, Australia).
The solution for this site was obtained via the point-positioning method
described above.  The following nominal coordinates were assumed:

     X = -2368686.7540 m,   Y = 4881316.4660 m,   Z = -3341796.3540 m

WARNING: Data from RCM5 excluded for the entire GPS week 767.
WARNING: Data from MATE excluded on day 261 (Sep 18).
WARNING: Data from CASA, MATE excluded on day 262 (Sep 19).
WARNING: Data from BRMU, CASA excluded on day 263 (Sep 20).
WARNING: Data from CAS1, MATE excluded on day 264 (Sep 21).
WARNING: Data from MAS1 excluded on day 266 (Sep 23).
WARNING: Data from WEST excluded on day 267 (Sep 24).

In the following table, UT1R-UTC are the assumed nominal values from IERS
Bulletin-B predicts; estimated LODR values are also included.  See IGS Mail
Message 97 for details.

JPL ERP TABLE                                GPS week 767 (1994 Sep 18 - Sep 24)
     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
49613.50  -3171  18349   657177  2341    6    8     0     10 43 13 25 -308   46 
49614.50  -3408  18463   654919  2350    6    8     0      9 39 12 25 -281   90 
49615.50  -3642  18624   652643  2361    7    7     0     10 29 12 25 -272  134 
49616.50  -3894  18753   650349  2375    6    6     0      8 32 12 25 -289   61 
49617.50  -4208  18888   648038  2463    7    7     0     11 28 12 25 -281  147 
49618.50  -4548  18936   645710  2352    8    7     0     10 32 11 25 -249   96 
49619.50  -4850  19056   643367  2371    6    6     0     10 32 13 25 -307  142 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 767:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 767 (1994 Sep 18 - Sep 24)
      94  9 18   94  9 19   94  9 20   94  9 21   94  9 22   94  9 23   94  9 24
prn   3d rss (m)
  1       0.57       0.53       0.51       0.53       0.47       0.49       0.52
  2       0.54       0.61       0.47       0.58       0.58       0.56       0.45
  4       0.82       0.96       0.22       0.32       0.54       0.71       0.25
  5       0.28       0.57       0.26       0.49       0.28       0.32       0.38
  6       0.44       0.58       0.50       1.08       0.47       0.47       0.62
  7       0.71       0.55       0.33       0.31       0.29       0.46       0.22
  9       0.52       0.70       0.29       0.53       0.30       0.42       0.25
 12       0.42       0.54       0.28       0.54       0.25       0.35       0.22
 14       0.69       0.59       0.49       0.40       0.22       0.41       0.39
 15       0.48       0.57       0.43       0.29       0.27       0.23       0.38
 16       0.78       1.15       0.85       0.94       0.32       0.50       0.55
 17       0.36       0.30       0.29       0.26       0.34       0.47       0.51
 18       1.32       0.94       0.76       0.61       0.66       0.55       0.28
 19       0.54       0.36       0.30       0.34       0.67       0.36       0.36
 20       0.37       0.38       0.43       0.61       0.40       0.32       0.36
 21       0.64       0.43       0.41       0.47       0.53       0.48       0.52
 22       0.43       0.47       0.39       0.55       0.46       0.30       0.42
 23       0.94       0.61       0.42       0.45       0.35       0.54       0.51
 24       0.21       0.26       0.18       0.22       0.20       0.71       0.52
 25       0.52       0.55       0.41       0.47       0.43       0.39       0.43
 26       0.93       0.61       0.63       0.91       0.46       0.22       0.26
 27       0.70       0.57       0.38       0.22       0.47       0.35       0.57
 28       0.75       0.69       0.37       0.53       0.55       0.61       0.48
 29       1.11       0.77       0.75       0.84       0.53       0.55       0.39
 31       0.70       0.55       0.46       0.72       0.30       0.33       0.58
_______________________
END ORBIT REPEATABILITY 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
      94  9 18   94  9 19   94  9 20   94  9 21   94  9 22   94  9 23   94  9 24
prn   3d rss (m)
  1       6.1        5.6        5.7        6.2        8.4       11.4        7.5 
  2       6.6        5.7        5.9        5.9        4.3        4.0        3.8 
  4       2.8        3.6        5.3        3.6        4.0        4.6        4.1 
  5       5.1        2.9        4.0        4.1        3.7        2.9        3.0 
  6       5.8        5.2        6.2        5.6       13.0       39.7       12.7 
  7       7.5        8.0        9.6        7.9        6.6        6.4        5.9 
  9       3.1        2.6        2.2        2.2        2.9        3.5        2.5 
 12       1.2        2.72       3.6        2.5        2.8        2.4        2.2 
 14       5.0        4.6        4.5        5.2        5.1        3.7        4.3 
 15       6.0        5.5        6.5        9.0        5.7        2.5        5.4 
 16       3.2        4.1        9.8        5.6        4.9        5.0        7.6 
 17       7.9        9.1        7.7        1.8        1.8        2.1        5.2 
 18       9.9        8.9        8.8        9.4        9.3        9.8        9.1 
 19       3.2        3.5        2.8        2.7        3.7        3.3        4.8 
 20       2.9        2.8        4.2        4.5        3.2        4.1        2.5 
 21       5.0        9.2        8.0        5.7        5.5        5.1        4.8 
 22       5.7        6.9        9.0        9.8        9.3        5.8        5.9 
 23      14.5       18.0       15.3       12.6       19.8       11.1        5.9 
 24       6.4        6.5        9.0        7.0        4.3        4.8        6.2 
 25       4.6        4.0        3.4        3.5        3.9        4.2        4.0 
 26       5.3        4.5        5.3        3.8        3.8        3.3        5.2 
 27       6.4        6.3        5.0        5.4        5.4        5.4        5.9 
 28       3.8        3.0        3.4        3.5        3.1        5.0        5.4 
 29       6.5        6.4        7.5        8.7        7.0        5.7        4.9 
 31       5.7        5.2        5.4        6.1        4.5        5.7        5.5 
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

The following tables, as explained in IGS Report Nos. 99 and 295, indicate the
amount of global network tracking data used in this week's analysis:

JPL SITE SUMMARY TABLE (no. stations)        GPS week 767 (1994 Sep 18 - Sep 24)
      94  9 18   94  9 19   94  9 20   94  9 21   94  9 22   94  9 23   94  9 24
Fiducial 12.5       11.9       11.4       12.3       11.7       10.2       13.2
Total    41.9       38.1       28.2       31.8       27.0       30.5       31.3
END SITE SUMMARY TABLE

JPL GROUND STATION INCLUSION TABLE           GPS week 767 (1994 Sep 18 - Sep 24)
      94  9 18   94  9 19   94  9 20   94  9 21   94  9 22   94  9 23   94  9 24
site    % data
ALBH #    103        104        103        102        102        102        101
ALGO*#    107        107        105        104        104        105        104
AREQ #    112        112        111        109        110        109        110
BRMU #     93         98          0         70         82          0         90
CAS1 #     70         72         73          0         72         71         72
CASA #     96          0          0          0          0          0          0
CHTP #    103          0          0          0          0          0          0
DAV1 #     72         72         72          0          0          0          0
DRAO #    104        106          0          0          0          0          0
EISL #      0          0          0          0         70         98         70
FAIR*      79         47        104        104        104        104        106
FORT #    103        103        102        102        102        101        102
GODE #    107        106          0         95          0         60          0
GOLD*     104         82         27        100        102        103        102
GRAZ      110          0          0          0          0          0          0
HART*     106        106        106        105        104         63         94
HARV #     98        100          0          0          0          0          0
HERS      102         79          0          0          0          0          0
HOB2 #      0         68          0         68          0         70         68
JPLM #    106          0          0          0          0          0          0
KIRU #     88          0          0          0          0         96          0
KOKB*     107        109        106        107         45         37        106
KOSG*     102        101        100        101        102        101        102
KOUR       92         98        103        101        100         99         98
MAC1 #     71         68         68         69         70         67         70
MADR*     107        106        106        105        107          0        106
MAS1 #     98         92         90         93        106          0        105
MATE        0          0          0          0        107        107        108
MCMU #    115        114        115        116          0        113        109
MDO1 #    107        106        105         95         94        105        105
METS      103        103        104         93          0          0         85
NLIB #    106        105        103        103        103        102        102
NYAL      112        114        116        105          0          0        103
ONSA #      0         83          0        107        106        106          0
PAMA       99        101        100        102        102        103         99
PIE1 #    106        104          0          0          0          0          0
QUIN #    104        104          0        103          0        102          0
SANT*       5          0         88         87         90         89         88
STJO #     66         98        109        108          0        108          0
TAIW       99        100        100        104        105        105        105
TIDB*     102        106          0          0         93         98        101
TROM*     108        110        110         98          0          0         96
TSKB #      0          0        106        105        100        104        101
USUD #     95         98          0          0          0          0          0
WEST #    107        107          0          0          0        105          0
WETT*     108        108        108        109        108        108        105
YAR1*     104        102         78        105        107        107        106
YELL*#    107        107        107        107        107        106        107
_______________________
*Indicates fiducial site; #indicates TurboRogue psuedo-range used
END GROUND STATION INCLUSION TABLE

As described in IGS Report No. 634, the table below indicates the repeatability
of clock solutions for all satellites and stations used in this week's analysis:

JPL CLOCK REPEATABILITY TABLE                GPS week 767 (1994 Sep 18 - Sep 24)
      94  9 18   94  9 19   94  9 20   94  9 21   94  9 22   94  9 23   94  9 24
comp log10(rms/ps)
PRN01     3.1        3          4          3.6        3.3        3.4        3.3
PRN02     3.7        3          3          3.8        4.0        3.8        4.0
PRN04     5.0        5          5          4.5        3.8        4.1        4.3
PRN05     3.9        4          4          3.7        3.5        3.8        3.9
PRN06     4.2        4          4          3.7        3.9        3.8        4.1
PRN07     3.6        4          4          3.7        3.7        4.0        4.1
PRN09     3.2        3          3          3.7        3.8        3.5        4.0
PRN12     4.0        4          3          3.7        3.9        3.9        3.8
PRN14     4.7        4          3          3.5        3.2        3.7        3.7
PRN15     3.4        3          4          4.0        3.8        4.2        4.2
PRN16     4.4        5          4          3.5        4.2        4.7        4.9
PRN17     3.6        2          4          4.0        3.8        3.9        4.1
PRN18     4.9        5          3          4.4        4.9        4.9        5.0
PRN19     4.6        5          3          3.9        4.1        4.0        4.1
PRN20     4.0        4          3          3.6        3.5        2.8        3.7
PRN21     3.0        4          4          3.7        3.5        3.5        2.6
PRN22     4.9        4          5          4.1        4.6        4.5        4.9
PRN23     3.9        4          3          3.6        3.7        3.8        3.9
PRN24     4.6        5          4          3.9        3.7        3.8        5.0
PRN25     4.5        3          3          3.8        3.9        3.9        4.0
PRN26     3.7        4          4          3.7        4.0        4.1        4.1
PRN27     4.2        5          4          3.7        3.3        4.8        4.7
PRN28     4.4        5          4          4.3        4.3        4.2        4.6
PRN29     5.0        4          4          4.1        4.1        3.6        4.8
PRN31     4.1        4          4          4.2        4.7        4.3        4.3
ALBH      3.3        3          3          3.5        3.5        3.1        2.9
AREQ      3.3        4          3          3.3        3.2        2.7        2.7
BRMU      3.5        4                     3          4                     4  
DRAO      3.3        3                                                         
EISL                                                  3          3.3        3  
FAIR      3.5        4          3          3.8        3.8        3.3        3.4
FORT      3.4        4          3          3.3        3.4        2.1        2.8
GODE      3.2        3                                                         
GOLD      3.4        3          4          3.6        3.7        3.7        3.5
GRAZ      4                                                                    
HART      4.5        5          4          4.0        3.9        4          4.2
HARV      3.2        3                                                         
HERS      3.8        4                                                         
KIRU      3                                                                    
KOKB      4.5        4          4          3.5        4          3          2.9
KOSG      3.5        4          2          3.3        3.4        2.6        2.6
KOUR      4.0        4          4          3.9        4.0        3.8        3.7
MADR      3.5        3          2          3.5        4                     3  
MAS1      3.4        3          2          3.3        3                     2  
MATE                                                  3          2.4        3.0
MCMU      4.5        4          2          3                     4          3.7
MDO1      3.3        3          2          3.1        2.9        2.8        2.7
METS      4.0        4          3          3                                3  
NLIB      3.3        3          3          3.3        3.4        2.7        2.5
NYAL      3.6        4          4          4                                3  
ONSA                                       4          3.5        2             
PAMA      4.5        4          4          4.0        3.9        4.0        4.3
PIE1      3.3        3                                                         
QUIN      3.3        3                                                         
SANT                            4          4.0        3.9        3.4        3.9
STJO      3          4          3          3                                   
TAIW      3.3        3          4          3.9        4.0        3.8        3.9
TIDB      4.6        4                                2          3.3        3.7
TROM      3.9        4          3          3                                3  
TSKB                            2          3.4        3.6        3.4        3.3
USUD      3.5        4                                                         
WEST      3.2        3                                                         
WETT      3.3        3          4          3.8        3.8        3.4        3.3
YAR1      4.5        5          3          3.7        3.7        3.9        4.0
YELL      3.2        3          2          3.4        3.5        3.0        3.1
_______________________
END CLOCK REPEATABILITY TABLE

[Mailed From: [email-masked]]