Subject: [IGSREPORT-0782] JPL Analysis Report (week 734)
From: David C. Jefferson, James F. Zumberge
Date: Fri, 11 Feb 1994 15:08:12 PST

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IGS Electronic Report    Fri Feb 11 15:08:12 PST 1994      Message Number 0782
******************************************************************************

Author: David C. Jefferson, James F. Zumberge
Subject: JPL Analysis Report (week 734)

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JPL ANALYSIS REPORT   GPS-WEEK 0734 (DAYS 30-36, DATES 1994 Jan 30 - Feb 05)
******************************************************************************

Submitted by the JPL IGS/FLINN Analysis Team:

J F Zumberge, D C Jefferson, M B Heflin, 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/0734.  These files have also been sent to the CDDIS.

______________________________________________________________________________
filename               contents
______________________________________________________________________________
jpl07347.sum           This text file.
jpl07347.erp           Earth rotation parameters for GPS week 734.
jpl0734[0-6].sp3       GPS ephemerides for GPS week 734, sp3 format.
______________________________________________________________________________

According to IGS Message #467, ALGO experienced limited tracking on day 031.
We have chosen to use FAIR as the reference clock for the processing of this
day only.

Also, according to the file gpsn1.txt obtained from tycho.usno.navy.mil,
PRN16/GPS16 was scheduled unusable for up to 12 hours beginning at 08:35 on day
033 (February 2).  We have excluded this satellite from the this day's analysis.

Anti-spoofing has been in effect since Monday, Jan 31.  Our AS strategy has
been augmented, resulting in improved quality of orbits.  Based on
discontinuities in post-fit residuals following the first pass through the
parameter-estimation portion of the processing, we now allow the carrier-phase
bias parameter to be adjusted at times when the magnitude of the discontinuity
exceeds a threshold, currently set to be 10 cm.  We have analyzed the the
period Jan 31 - Feb 04 with both the old and new strategies.  We find the
following improvements:

   - reduction in the median value of the orbit repeatability from 103 cm
     to 63 cm

   - reduced number of (deleted) outliers (> 5-cm post-fit residual), from
     several thousand per day to ~200 per day

   - 30% reduction in the number of post-fit residuals that exceed 1 cm in
     magnitude (following outlier detection and deletion)

WARNING: FAIR (not ALGO) was used as the reference clock for day 031 (Jan 31).
WARNING: Data from PRN16/GPS16 were exlcuded on day 033 (Feb 2).

JPL LODR TABLE                               GPS week 734 (1994 Jan 30 - Feb 05)
  MJD       LODR     +/-
          (ms/day)
 49382.5    2.32     0.04
 49383.5    2.23     0.01
 49384.5    2.16     0.01
 49385.5    2.05     0.01
 49386.5    2.01     0.01
 49387.5    2.02     0.01
 49388.5    2.10     0.02
END LODR TABLE

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

JPL UTPM TABLE                               GPS week 734 (1994 Jan 30 - Feb 05)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS    
           ''        ''        sec     ''     ''      sec
 49382.5   .08311   .47317   .12416  .00012  .00012  .00000  .0  .09  .00  .00  40 26  0
 49383.5   .08626   .47203   .12161  .00009  .00010  .00000  .0  .06  .00  .00  41 26  0
 49384.5   .08884   .47108   .11907  .00009  .00010  .00000  .0  .10  .00  .00  40 26  0
 49385.5   .09152   .47064   .11652  .00010  .00011  .00000  .0  .06  .00  .00  41 25  0
 49386.5   .09494   .47082   .11396  .00010  .00011  .00000  .0  .08  .00  .00  39 26  0
 49387.5   .09697   .46965   .11140  .00011  .00013  .00000  .0  .09  .00  .00  40 26  0
 49388.5   .09888   .46840   .10884  .00014  .00016  .00000  .0  .12  .00  .00  38 26  0
END UTPM TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 734:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 734 (1994 Jan 30 - Feb 05)
      94  1 30   94  1 31   94  2  1   94  2  2   94  2  3   94  2  4   94  2  5
prn   3d rss (m)
  1       0.57       1.81       0.80       0.75       1.33       1.51       1.1 
  2       0.44       0.80       1.16       1.11       1.43       1.09       0.3 
  3       0.52       0.63       0.51       0.41       0.36       0.59       0.9 
  4       1.27       0.80       0.84       0.94       1.45       0.93       1.1 
  5       0.92       2.66       2.03       1.55       1.80       1.31       0.9 
  7       0.32       0.69       0.88       0.52       1.48       1.05       0.5 
  9       0.47       0.31       0.55       0.62       0.55       0.44       0.3 
 12       0.50       0.28       0.40       0.39       0.64       0.56       0.4 
 13       0.59       0.75       0.85       0.87       1.32       0.92       0.4 
 14       0.37       1.03       0.57       0.55       0.85       0.73       0.8 
 15       0.39       0.64       0.46       0.51       0.65       0.52       0.3 
 16       0.51       0.61       0.6                   2.8        4.91       1.2 
 17       0.67       0.96       0.71       1.42       0.71       0.89       1.0 
 18       0.29       0.60       0.58       0.51       0.41       0.34       0.2 
 19       0.34       0.40       0.50       0.49       0.47       0.59       0.4 
 20       1.04       1.12       1.19       1.22       1.83       1.42       0.8 
 21       0.58       0.49       0.99       0.78       1.06       0.88       0.6 
 22       0.24       0.82       1.02       0.82       1.62       0.60       1.0 
 23       0.59       0.93       1.54       1.42       0.99       1.07       0.8 
 24       0.6        0.46       0.77       1.18       1.68       0.94       0.7 
 25       0.36       0.54       0.66       0.73       0.67       0.66       1.1 
 26       0.43       0.25       0.52       0.52       0.82       0.48       0.3 
 27       0.19       0.53       0.52       0.32       0.72       0.59       0.2 
 28       0.21       0.40       0.64       0.90       1.03       0.39       0.9 
 29       0.23       0.28       0.35       0.51       0.56       0.39       0.4 
 31       0.29       0.54       0.39       0.57       0.57       0.48       0.6 
_______________________
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  1 30   94  1 31   94  2  1   94  2  2   94  2  3   94  2  4   94  2  5
prn   3d rss (m)
  1       6.9        7.3        7.6        6.1        6.3        8.4        7.7 
  2       7.7        7.4        7.3        7.9        7.5        8.5        9.3 
  3      23.1       14.4       12.2       11.2       10.3        9.5        8.7 
  4      27.5       17.5       16.1       18.8       20.5       21.4       21.0 
  5      11.2        8.2        7.8        9.2        7.6        8.9        7.3 
  7       5.4        3.9        4.8        4.9        5.1        4.7        5.5 
  9       3.9        6.1        5.8        4.4        5.0        3.4        3.7 
 12       6.5        7.1        6.4        7.3        3.8        3.9        4.4 
 13       6.9        8.0        6.7        6.4        6.9        5.6        6.4 
 14       7.6        7.3        6.7        5.2        4.9        5.0        6.1 
 15       6.6        4.1        4.8        6.6        4.5        4.2        5.8 
 16       5.0        5.0        4.7                  24.2       15.9       16.6 
 17       5.0        5.8        5.5        6.0        5.3        5.7        5.2 
 18      24.2       16.2        8.5        6.2       16.1        9.3       10.0 
 19       7.8        6.0        4.6        7.2        7.1        5.3        4.9 
 20      11.9        7.4        8.1        6.1        6.3        7.3        7.6 
 21       8.4        7.2        4.5        3.8        5.1        6.5        4.1 
 22       7.6        8.1        8.1        8.6        8.3       11.1       10.5 
 23       8.2        4.2        4.5        5.4        7.2        6.8        6.6 
 24      11.1       10.5       12.0       12.1        9.0        8.2        9.3 
 25       7.3        5.6        5.4        5.1        5.4        6.2        6.9 
 26       7.3        5.2        6.3        6.5        6.7        7.6        6.5 
 27       8.0        7.0        5.9        6.2        6.7        7.7        6.9 
 28       6.0        4.2        3.7        3.7        3.9        4.0        3.3 
 29       5.9        4.5        4.7        5.2        4.7        4.3        5.9 
 31       5.6        5.1        5.2        5.1        4.8        5.6        5.0 
_______________________
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 734 (1994 Jan 30 - Feb 05)
      94  1 30   94  1 31   94  2  1   94  2  2   94  2  3   94  2  4   94  2  5
Fiducial 11.2       10.2       10.9        9.7       10.2        9.6        9.2
Total    36.5       33.3       31.8       31.4       30.5       31.7       33.1
END SITE SUMMARY TABLE

JPL GROUND STATION INCLUSION TABLE           GPS week 734 (1994 Jan 30 - Feb 05)
      94  1 30   94  1 31   94  2  1   94  2  2   94  2  3   94  2  4   94  2  5
site    % data
ALBH       99         96         97         93         98         99        100
ALGO*      93         62         75         70         65         78         73
BRMU       62         59         60         90         97         80         88
CRO1       94         91         90         87         82         82         87
DRAO       98         84         73         81         77         71         70
FAIR*     104         77         78         70         77         72         78
FORT      100         91         92         89         91         93         93
GODE       92         96         95         85         60         90         94
GOLD*      91         93         89         87         66         57         72
GRAZ        0          0          0         66          0          0         89
HART*      98         78         90         76         81         69         84
HERS       97         78         81         79         68         77         85
HOBA      100         94         97         93         93         94         96
JPLM      102         70         66         60         64         76          0
KIRU        0          0          0          0          0          0         94
KOKB*      46         70         81         75         67         75         80
KOSG*      97         78         76         53         63         67         94
KOUR       93         92         89         79          0         80         90
MADR*      95         95         93         87         83         57          0
MASP       92         93         93         88         92         91         95
MATE      100         77         76         73         72         72         71
MCMU      107         83         48         29         76          0         87
MDO1       97         96         96         94         97         96         93
METS       94         74         88         81         76         76         76
NLIB       82         83         75          0         46         66         79
NYAL      104        104        103         99        103        103        103
ONSA       93         85          0         73          0         83         92
PAMA       93         76         25         68         74         76         72
PIE1       97         99         97         90         90         89         86
QUIN       99         87         75         91         75         88         93
RCM5       96         72         67         85         99         98         98
SANT*      99         79         74         72         73         75         36
STJO       98         93         97         93         95         97         96
TAIW       98         83         79         83         81         82         87
TIDB*      95         92         83         32         79         66         65
TROM*     100        101        100         95        100        100         98
USUD      100         88         69         63         67         81          0
VNDP       49         73         73         71         71         80         84
WEST       96         94         94         89         92         92         92
WETT*      99         67         71         70         79         72         66
YAR1*     102         89         78         87         85         74         79
YELL*       0         35         98         95         99         99         98
_______________________
*Indicates fiducial site; #indicates deweighted site.
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 734 (1994 Jan 30 - Feb 05)
      94  1 30   94  1 31   94  2  1   94  2  2   94  2  3   94  2  4   94  2  5
comp log10(rms/ps)
PRN01     6          6          5.9        7.2        4.1        4.1        3  
PRN02     6          6          7.7        7.2        4.0        3.8        4  
PRN03     6          6          7.8        8.2        4.1        4.3        4  
PRN04     6          6          8.2        7.9        4.0        3.8        4  
PRN05     6          6          7.8        8.0        4.1        4.0        4  
PRN07     6          6          7.7        7.3        4.0        3.9        4  
PRN09     6          6          7.9        8.1        3.9        4.1        3  
PRN12     6          6          7.9        8.1        4.3        4.3        4  
PRN13     6          6          8.3        7.8        4.2        4.3        4  
PRN14     6          6          7          7.2        4.0        4.1        3  
PRN15     6          6          7          7.1        4.3        4.1        4  
PRN16     6          7          7                     4          4.0        3  
PRN17     6          6          8.0        8.9        4.3        4.1        4  
PRN18     6          6          7.0        7.5        3.7        3.7        4  
PRN19     6          6          7.6        6.8        3.8        3.4        3  
PRN20     6          6          7.8        8.1        4.1        4.0        4  
PRN21     6          6          7.7        7.0        4.3        3.9        3  
PRN22     6          6          7.4        7.1        4.0        3.9        4  
PRN23     6          6          7.7        7.5        4.0        3.3        4  
PRN24     6          6          8.1        8.0        4.0        4.3        4  
PRN25     6          6          7.6        7.2        4.2        4.1        4  
PRN26     6          6          7.6        7.4        3.9        4.0        4  
PRN27     6          6          7.2        7.4        3.9        3.7        3  
PRN28     6          6          7.3        7.3        4.0        3.5        3  
PRN29     6          6          6.3        7.3        3.9        3.8        4  
PRN31     6          6          6.8        7.3        3.9        4.0        4  
ALBH      6          6          6.7        7.2        4.0        3.9        4  
BRMU      6          6          6.4        6.8        4.1        3.8        4  
CANB      6          6          7.9        8          4.2        4.0        4  
CRO1      6          6          6.8        6.8        4.1        3          3  
FAIR                            8          7.3        4.1        3.5        4  
FORT      6          6          7.0        7.0        4.3        4.0        4  
GODE      6          6          6.6        6.8        4.0        3.8        4  
GOLD      6          6          6.7        6.8        3.9        3.7        4  
HART      6          6          7.4        7.7        4.2        4.1        4  
HARV      6          6          6.7        7.0        3.8        3.5        4  
HERS      6          6          7.9        7.0        3.8        3.9        4  
HOBA      6          6          7.9        8.0        3.7        4.1        4  
JPLM      6          6          6.3        7.1        4.1        1             
KOKB      6          6          7.9        7.0        4.2        3.6        4  
KOSG      6          6          7.8        7.1        4.1        3.9        4  
KOUR      6          6          7.1        7                     4          4  
MADR      6          6          7.8        7.1        4.1        4             
MASP      6          6          7.6        6.9        3.3        3.9        3  
MATE      6          6          7.8        7.3        4.0        3.8        2  
MCMU      6          6          5          7          4                        
MDO1      6          6          6.4        6.9        4.1        3.8        3  
METS      6          6          7.7        7.9        3.9        4.3        5  
NALL      6          6          7.5        7.6        4.2        4.0        4  
NLIB      6          6          6                     4          3.8        4  
ONSA      6                                                      4          4  
PAMA      6          6          7.7        7.6        4.2        4.4        3  
PENT      6          6          6.8        7.0        4.0        3.6        4  
PIE1      6          6          6.7        6.9        3.9        3.8        3  
QUIN      6          6          6.3        7.1        3.9        3.9        2  
RCM5      6          6          7.0        6.9        4.0        3.3        3  
SANT      6          6          7.3        7.5        3.9        4.0        2  
STJO      6          6          7.1        6.6        3.8        4.0        4  
TAIS      6          6          7.9        7          4.1        4.1        4  
TROM      6          6          7.5        7.8        4.2        4.1        4  
USUD      6          8          8.8        8.5        4.1        4             
VNDP      6          6          7.0        6.9        4.0        3.4        3  
WEST      6          6          6.5        6.8        4.0        3.3        4  
WETB      6          6          7.8        7.1        4.2        3.7        4  
YAR1      6          6          7.8        8.0        4.1        4.2        4  
YELL                 6          6.9        6.9        4.1        4.4        4  
_______________________
END CLOCK REPEATABILITY TABLE