Subject: [IGSREPORT-115] JPL Analysis Report (week 679)
From: David C Jefferson
Date: 28 JAN 1993 00:00:00

Message inbox:92 -  Read
From:     David C Jefferson
Subject:  JPL Analysis Report (week 679)
----------------------------------------

Submitted by

J F Zumberge, G Blewitt, M B Heflin, D C Jefferson, F H Webb

all at the Jet Propulsion Laboratory, California Institute of Technology, 
Pasadena, CA  91109.

The following files have been posted on BODHI (for access to BODHI contact
[email-masked]):

______________________________________________________________________________
filename               contents
______________________________________________________________________________
jpl06797.sum           This text file.
jpl06797.erp           Earth rotation parameters for GPS week 679.
jpl06797.sp1           GPS ephemerides for GPS week 679, sp1 format.
jpl06797.sp3            "       "       "   "   "    " , sp3   "   .
______________________________________________________________________________

For this week's analysis, we continue to deweight data from PRN11/GPS08, and
PRN29/GPS29, as their repeatability results remain at the few-meter level.
As noted in the previous week's analysis report, solar radiation pressure was
estimated as a constant for PRN29 for Sunday, January 10 (day 010) ONLY.
The remainder of the week uses stochastic SRP estimation for all satellites.

Also, according to the file pub/gps/gpsn1.txt obtained from tycho.usno.navy.mil,
PRN19/GPS19 was scheduled unusable for up to 8 hours on Jan 15 (day 015),
beginning at 22:30 UT. Our analysis confirms that the behavior of this 
satellite is poorly modeled on this day, as well as the following day (Jan 16),
where "day" means the 30-hr period centered on GPS noon of the indicated date.
The corresponding data have thus been de-weighted on both days, and we 
recommend using the broadcast ephemeris during these times.

Starting this week we include data from GRAZ (Graz, Austria), PIE1 (Pie Town, 
New Mexico, USA), and QUIN (Quincy, California, USA). The following nominal 
coordinates were assumed, and the station locations were estimated 
(unconstrained) each day:

            GRAZ                  PIE1                  QUIN
 X(m) = 4194424.0960         -1640884.5670         -2517230.8830 
 Y(m) = 1162702.4560         -5014789.0820         -4198595.1840
 Z(m) = 4647245.2890          3575445.0510          4076531.2530

WARNING: PRN's 11 and 29 (GPS08 and GPS29) show unmodeled behavior at the                meter-level for week 679 and their data have been deweighted.
WARNING: PRN19/GPS19 is poorly modeled on January 15 and 16 and its data have            been deweighted for these days.

JPL LODR TABLE                               GPS week 679 (1993 Jan 10 - Jan 16)
  MJD       LODR     +/-
          (ms/day)
 48997.5    2.26     0.05
 48998.5    2.05     0.05
 48999.5    1.94     0.05
 49000.5    2.19     0.05
 49001.5    2.25     0.05
 49002.5    2.32     0.06
 49003.5    2.40     0.06
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 679 (1993 Jan 10 - Jan 16)
  MJD       X        Y       UT1R-UTC XSIG    YSIG   UTSIG  RMS  XYC  XUC  YUC STA SAT PASS    
           ''        ''        sec     ''     ''      sec
 48997.5   .21293   .33287   .04634  .00013  .00015  .00000  .0  .10  .00  .00  27 21  0
 48998.5   .21536   .33038   .04405  .00014  .00017  .00000  .0  .07  .00  .00  30 21  0
 48999.5   .21601   .32835   .04175  .00015  .00019  .00000  .0  .02  .00  .00  30 21  0
 49000.5   .21582   .32631   .03945  .00014  .00018  .00000  .0  .06  .00  .00  30 21  0
 49001.5   .21580   .32371   .03714  .00014  .00018  .00000  .0  .08  .00  .00  30 21  0
 49002.5   .21561   .32086   .03483  .00015  .00020  .00000  .0  .05  .00  .00  30 21  0
 49003.5   .21377   .31825   .03251  .00016  .00020  .00000  .0  .07  .00  .00  29 21  0
END UTPM TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 679:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 679 (1993 Jan 10 - Jan 16)
      93  1 10   93  1 11   93  1 12   93  1 13   93  1 14   93  1 15   93  1 16
prn   3d rss (m)
  2       0.78       0.37       0.18       0.40       0.60       0.39       0.54
  3       0.79       0.76       0.32       0.16       0.35       0.27       0.49
 11       1.53       1.71       3.03       2.29       2.77       2.36       4.26
 12       1.02       0.56       0.54       0.64       0.53       0.77       0.81
 13       0.44       0.80       0.75       0.76       0.47       1.05       0.88
 14       0.40       0.57       0.66       0.56       0.53       0.59       0.51
 15       0.43       0.32       0.48       0.67       0.78       0.69       0.46
 16       2.46       0.49       0.25       0.25       0.19       0.46       0.40
 17       0.65       0.39       0.35       0.30       0.24       0.31       0.58
 18       0.38       0.35       0.24       0.28       0.33       0.36       0.39
 19       0.39       0.23       0.20       0.25       6.99     694.48     298.06
 20       0.47       0.51       0.41       0.34       0.23       0.33       0.36
 21       0.47       0.28       0.55       0.45       0.54       0.42       0.34
 23       0.62       0.96       0.60       0.39       0.60       0.97       0.97
 24       0.47       0.50       0.55       0.16       0.65       1.04       0.66
 25       0.29       0.25       0.40       0.37       0.40       0.30       0.36
 26       0.45       0.36       0.40       0.51       0.57       0.65       0.58
 27       0.75       0.38       0.18       0.14       0.40       0.35       0.45
 28       0.35       0.37       0.45       0.28       0.33       0.42       0.31
 29       7.55       1.47       1.71       1.83       1.17       1.63       1.27
 32       0.61       0.55       0.37       0.38       0.37       0.50       0.78
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
      93  1 10   93  1 11   93  1 12   93  1 13   93  1 14   93  1 15   93  1 16
prn   3d rss (m)
  2       4.8        4.1        5.0        6.4        5.3        4.2        5.6 
  3      14.3       11.7       13.8       11.2       11.6       11.8       12.9 
 11      12.1       10.6       11.1       18.6       13.13      13.3        8.9 
 12      10.6       15.0        8.1        5.9        6.9        4.3        4.9 
 13       3.0        3.1        3.7        4.6        6.0        5.1        2.8 
 14       8.2        6.3        6.7        7.7        4.0        7.5        7.1 
 15       7.8        8.7        5.3        8.1        7.1       11.9       10.3 
 16       5.8        5.2        4.3        5.1        4.6        5.4        5.8 
 17       6.2        8.2        7.8        8.6        6.2        5.4        5.8 
 18       7.2        6.9        7.6        8.9        7.3        6.5        8.9 
 19       7.5        6.9        9.9        7.8        5.8        9.2      660.2 
 20       6.0        4.9        6.4        8.4        8.4        9.6        8.1 
 21       3.3        3.1        3.2        5.5        2.6        3.8        4.7 
 23       5.2        3.8        4.9        3.6        4.3        6.4        4.3 
 24       8.6        8.4        9.8       11.4       12.4       12.0       10.6 
 25       7.2        7.3        7.0        6.6        7.3        7.3        7.5 
 26       3.6        3.2        2.9        3.6        3.3        3.2        2.8 
 27      16.2       15.2       15.4       15.5       14.2       14.9       15.7 
 28       7.9        3.5        9.4        8.3        9.8        2.4        2.5 
 29      40.6       44.9       46.6       47.9       41.5       33.8       34.9 
 32       7.2        9.4        4.6        5.2        5.1        4.8        6.7 
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

The following table, as explained in IGS Report No. 99, indicates the amount
of data from each tracking site used in this week's analysis: 

JPL GROUND STATION INCLUSION TABLE           GPS week 679 (1993 Jan 10 - Jan 16)
      93  1 10   93  1 11   93  1 12   93  1 13   93  1 14   93  1 15   93  1 16
site    % data
ALBH      107        107        108        108         95         88         87
ALGO*     106         96        105        102         83         76         81
CANB      103        103        102        102         89         86         88
FAIR*       4         35        102        103         91         86         87
GOLD      105        107        103         80         67         82         83
GRAZ                  67         98        108         99         95         95
HART*     111        110        110        111        104        100         99
JPLM      112        113        113        113         98         90         90
KOKB*     104        112        112        113        103         91         97
KOSG      108        108        107        108         99         95         96
KOUR      111        111        110        109         97         92         86
MADR*     101        101        101         77         86         83         85
MASP      110         48         59        110        101         96         95
MATE      107         85         85        108         97         74         93
MCMU      127         96          9
METS      110        112        112        113         90         81        100
NALL                                        57         98         20         87
ONSA       94        106        111        112        102         92         83
PAMA      103        102        102        103         96         91         91
PENT      111        102        110        111         98         90         89
PIE1                 102         35         42         92         82         81
RCM2      107         99         59         91         60          4
SANT*     112        113        113        113         99         94         92
STJO      103        103        104        104         98         91         91
TAIS      105        105         54         99         95         83          9
TROM*     119        119        120        121         97         88        108
USUD      106        109        110        110        101         94         93
WETB      107        108        109        109         99         96         95
YELL      115        116        116        117        104         97         97
_______________________
*Indicates fiducial site.
END GROUND STATION INCLUSION TABLE