Subject: [IGSREPORT-3439] Wk 0890 JPL Analysis Report
From: D C Jefferson
Date: Tue, 11 Feb 1997 9:08:41 PST

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IGS Electronic Report    Tue Feb 11  9:08:41 PST 1997      Message Number 3439
******************************************************************************

Author: D C Jefferson
Subject: Wk 0890 JPL Analysis Report

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JPL ANALYSIS REPORT   GPS-WEEK 0890 (DAYS 26-32, DATES 1997 Jan 26 - Feb 01)
******************************************************************************

Submitted by the JPL IGS/FLINN Analysis Team:

J F Zumberge, D C Jefferson, M B Heflin, M M Watkins, F H Webb, Y E Bar-Sever

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/0890.  These files (except for *.tro) have also
been sent to the CDDIS.

______________________________________________________________________________
filename             contents
______________________________________________________________________________
jpl08907.sum         This text file.
jpl08907.erp         Earth rotation parameters for GPS week 890.
jpl08907.snx         Ground station coordinates for GPS week 890, SINEX format.
jpl0890[0-6].sp3     GPS ephemerides for GPS week 890, sp3 format.
jpl0890[0-6].tro     Ground station troposphere estimates for GPS week 890.
______________________________________________________________________________

Median Orbit Repeatability (see table below): 14.0 cm
                           (excluding deweighted satellites)

PRODUCTS UPDATE
---------------
Starting this week, our IGS submission has been upgraded to SINEX 1.0 format.
Thanks to Remi Ferland of NRCan for providing the SINEX conversion utilities.

This week we also begin reporting estimates of total zenith troposphere delay
from all the sites participating in our orbit solution process.  The files,
one for each solution day, will be made available on a weekly basis along with
the other IGS products; please see the products listing in the header above.

The information in the files is arranged according to Variant 2 in the agreed
upon format put forward by Gerd Gendt in his letter to the AC's from November
19, 1996.  Briefly, they contain the total troposphere delay at 5-minute
intervals from about 37 globally-distributed sites.  They also contain the
estimated coordinates for each of the participating sites.

GENERAL
------
We have recently discovered an error in our treatment of the solar radiation
pressure estimate for PRN's 10 and 30 which has existed since their inclusion
in our processing beginning in mid-1996.  This error has also likely been
responsible for the increased noise in our LOD estimates during that period.
The problems have been corrected beginning with day 2 of GPS week 890
(1997-027), and we expect that our LOD will return to its previous quality.
We no longer deweight data from PRN10 as of this date as well.

A clock reset was detected at ALGO at approximately 00:00 UT on day 032.  As
we use a 30-hour data span, we elected to use a different reference clock,
FAIR, on this and the previous day (031).

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 PRN10 deweighted on day 026 only.
WARNING: FAIR (not ALGO) used as reference clock days 031 and 032.
WARNING: Data from ONSA excluded day 026.
WARNING: Data from LPGS, YAR1 excluded day 027.
WARNING: Data from HOB2, TROM excluded day 028.
WARNING: Data from WTZR excluded day 029.
WARNING: Data from AUCK, CHAT excluded day 030.
WARNING: Data from AUCK, CHAT, POTM, WTZR excluded day 031.
WARNING: Data from AUCK, CHAT, HFLK, KELY, OHIG excluded day 032.

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 890 (1997 Jan 26 - Feb 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
50474.50  -9511  13450  -157154  1551    3    4     7      7 37 12 25 -307  279 
50475.50  -9821  13645  -158752  1644    3    4     8      8 37 12 25 -270  219 
50476.50 -10112  13863  -160395  1642    3    3     7      7 37 12 25 -300  253 
50477.50 -10420  14066  -161995  1558    3    3     7      7 37 11 25 -297  207 
50478.50 -10675  14213  -163538  1528    3    4     8      8 36  8 25 -300  257 
50479.50 -10952  14469  -165063  1523    3    3     8      8 37 11 25 -300  251 
50480.50 -11259  14674  -166519  1388    3    3     7      7 37 12 25 -287  229 
END ERP TABLE

The following table indicates the "3-dimensional orbit repeatability", as 
defined in IGS Mail Message 37, for GPS week 890:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]

JPL ORBIT REPEATABILITY TABLE                GPS week 890 (1997 Jan 26 - Feb 01)
      97  1 26   97  1 27   97  1 28   97  1 29   97  1 30   97  1 31   97  2  1
prn   3d rss (m)
  1       0.12       0.09       0.08       0.12       0.10       0.09       0.09
  2       0.14       0.19       0.08       0.08       0.07       0.09       0.07
  3       0.28       0.22       0.16       0.22       0.22       0.14       0.17
  4       0.09       0.08       0.16       0.12       0.14       0.14       0.16
  5       0.09       0.12       0.03       0.16       0.14       0.09       0.15
  6       0.16       0.15       0.08       0.07       0.10       0.07       0.13
  7       0.11       0.09       0.17       0.13       0.14       0.11       0.09
  9       0.11       0.13       0.10       0.11       0.07       0.11       0.15
 10       0.75       0.32       0.34       0.20       0.18       0.10       0.20
 14       0.20       0.15       0.13       0.20       0.17       0.18       0.26
 15       0.12       0.12       0.08       0.09       0.14       0.10       0.14
 16       0.45       0.36       0.16       0.15       0.13       0.19       0.31
 17       0.14       0.12       0.08       0.13       0.13       0.08       0.18
 18       0.26       0.25       0.15       0.11       0.15       0.25       0.51
 19       0.15       0.27       0.09       0.21       0.24       0.20       0.38
 21       0.14       0.12       0.08       0.09       0.09       0.09       0.11
 22       0.13       0.15       0.13       0.09       0.11       0.08       0.10
 23       0.17       0.15       0.17       0.22       0.19       0.11       0.13
 24       0.10       0.09       0.16       0.23       0.20       0.24       0.15
 25       0.23       0.05       0.12       0.29       0.14       0.17       0.17
 26       0.24       0.16       0.12       0.07       0.09       0.11       0.17
 27       0.19       0.15       0.09       0.12       0.15       0.12       0.11
 29       0.25       0.25       0.13       0.11       0.20       0.15       0.10
 30       0.28       0.17       0.09       0.20       0.15       0.09       0.12
 31       0.09       0.17       0.17       0.14       0.15       0.12       0.14
_______________________
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 890 (1997 Jan 26 - Feb 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)
 |     |      |           |           |           |           |
 |___  |__    |_______    |_______    |___        |___        |__
ALGO*  6.9    163.       -.802        61.4        4.00        2.83    
ANKR   2.0    102.       -1.30        53.0        4.00        2.87    
AREQ   3.9    99.8       -.540        39.7        5.05        1.58    
ASC1   6.9    84.2       -.742        80.0        5.59        1.41    
BAHR   5.2    .502        264.        40.3        4.77        3.52    
BOGT   7.0    130.       -.726        52.8        6.73        1.47    
BRAZ   1.0    102.       -.618        57.0        6.00        1.50    
BRUS   6.0    .403       -1.95        60.0        4.18        2.52    
CAS1   3.8    16.1        .204e+04    38.0        5.77        1.49    
CASA   1.8    7.02        17.0        48.2        5.66        2.68    
CHAT   3.9    107.       -.481        74.0        5.77        2.65    
COCO   5.8    216.       -.399e+04    42.1        6.23        3.28    
DAV1   2.0    43.0        250.        33.5        4.00        1.59    
DGAR   6.9    92.7       -.741        65.7        8.68        1.59    
FAIR*  7.0    .714e-01    .602        33.0        4.61        2.16    
FLIN   1.0    85.2       -.608        38.0        3.00        2.51    
FORT   5.9    .194       -1.05        51.4        7.72        2.69    
GODE   2.0    .141       -1.08        41.5        4.00        2.76    
GOL2*  7.0    .830e-01   -.875        61.3        4.92        2.70    
GUAM   7.0    116.       -.739        56.1        6.51        2.27    
HART*  7.0    603.       -3.31        49.3        5.33        2.60    
HOB2   1.9    .367       -1.23        51.1        5.00        2.76    
IISC   6.5    84.4       -.701        69.5        5.16        2.37    
IRKT   4.9    .183       -.339        45.0        5.00        2.89    
KELY   1.7    .187e+05   -1.26        44.4        6.00        1.48    
KERG   5.0    128.       -3.57          .         6.23        2.60    
KIRU   1.0    2.88       -.759        55.0        7.00        2.19    
KIT3   1.8    127.       -.923        61.0        4.53        3.25    
KOKB*  6.9    74.5       -.697        61.9        7.01        1.94    
KOSG*  7.0    42.8       -7.92        41.3        4.63        2.16    
KWJ1   5.9    89.0       -.780        60.5        7.34        1.61    
LHAS   4.2    .109e+07    579.        59.6        4.88        2.00    
MAC1   1.9    87.6       -.840        31.0        4.52        2.04    
MADR*  6.9    .878e-01    24.7          .         5.47        2.34    
MALI   5.0    21.2       -19.9          .         7.81        2.26    
MAS1   7.0    135.       -.676        41.2        4.61        2.39    
MCM4   6.0    98.1       -.781        42.2        5.51        1.56    
MKEA   4.8    .746e-01   -.823        43.6        5.63        2.45    
NOTO   2.0    .691e-01   -.631        31.0        4.51        2.78    
NYAL   1.0    .813       -1.38          .         5.00        1.65    
OHIG   3.8    .347e+05   -1.06        61.2        4.81        1.01    
PAMA   7.0    150.       -.741          .         11.2        2.12    
PERT   7.0    2.36       -4.88        49.7        4.90        3.08    
POL2   2.8    79.7       -.487        57.6        3.70        2.53    
RCM6   5.0    80.5       -.511        61.4        5.68        2.28    
REYK   1.0    74.9       -.569        57.0        6.00        1.62    
SANT*  5.3    .452e+04   -.638        40.1        5.56        .878    
SHAO   1.0    84.6       -.630        42.0        4.00        2.85    
THU1   5.0    75.3       -.648        42.2        5.21        2.27    
TID2*  5.9    20.1       -.643        41.5        6.54        2.71    
TROM*  2.0    4.95        28.8          .         7.03        1.28    
USUD   6.0    .842        1.94        35.6        4.55        2.73    
WTZR*  4.0    .168        .212        58.0        4.27        2.60    
WUHN   2.0    5.28       -435.        41.5        4.00        2.60    
XIAN   1.0    150.       -.389        51.0        4.00        3.04    
YAR1*  3.7    11.2       -.758          .         5.57        2.35    
YELL*  5.9    .308       -.530        43.0        4.70        1.53    
PRN01  7.0    79.6        11.4        53.9        5.73        2.28    
PRN02  6.9    82.1       -332.        55.0        5.87        2.03    
PRN03  6.6    79.5        93.7        53.3        5.87        2.05    
PRN04  6.9    82.1        9.64        49.8        6.31        1.85    
PRN05  7.0    81.2        79.1        51.0        5.60        2.48    
PRN06  6.8    82.7        3.48        49.5        5.90        2.40    
PRN07  6.8    81.3        737.        52.8        6.16        2.02    
PRN09  7.0    81.6       -26.7        53.1        5.31        2.41    
PRN10  4.9    81.0        2.51        53.4        6.04        2.00    
PRN14  6.6    82.1        16.1        50.5        5.76        1.85    
PRN15  7.0    3.71        386.        55.6        5.31        2.11    
PRN16  6.7    79.5        40.9        52.6        5.73        2.05    
PRN17  7.0    78.6       -139.        53.2        5.60        2.17    
PRN18  6.8    79.5        20.8        49.8        6.33        1.82    
PRN19  6.9    83.3        247.        52.2        5.76        1.90    
PRN21  6.9    81.9        27.3        55.3        6.02        2.19    
PRN22  6.9    81.8        367.        52.3        5.87        2.18    
PRN23  6.8    82.6        8.23        53.7        5.87        2.05    
PRN24  7.0    81.4        280.        49.8        6.59        2.07    
PRN25  7.0    81.6       -5.57        48.6        5.73        2.09    
PRN26  7.0    80.6       -111.        54.5        6.16        2.27    
PRN27  7.0    80.2        16.1        51.7        5.76        2.02    
PRN29  6.9    81.3        5.22        49.8        5.45        2.17    
PRN30  7.0    80.7       -32.4        47.9        5.46        2.34    
PRN31  6.6    81.9        189.        50.9        5.60        2.22    
_______________________
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  1 26   97  1 27   97  1 28   97  1 29   97  1 30   97  1 31   97  2  1
prn   3d rss (m)
  1       5.2        4.6        4.5        4.3        5.0        5.7        5.1 
  2       5.4        6.7        4.5        4.3        4.1        3.8        4.5 
  3       5.7        5.2        6.1        5.3        6.1        6.2        6.3 
  4       3.8        3.6        2.2        2.2        3.3        3.8        3.0 
  5       4.2        4.3        5.3        5.0        3.7        4.0        3.5 
  6       6.8        6.6        5.8        6.6        6.2        5.9        7.7 
  7       6.4        6.6        7.7        7.8        8.2        7.3        7.7 
  9       2.1        2.0        2.5        2.1        2.4        3.1        2.1 
 10       7.0        6.0        6.2        7.3        8.2        6.3        7.3 
 14       2.2        8.1        6.7        6.0        8.9        9.9        2.3 
 15       3.6        4.3        2.9        4.7        3.6        4.4        3.9 
 16       2.0        2.5        2.8        4.3        3.5        3.0        2.9 
 17       4.0        3.7        4.0        4.8        6.4        4.6        4.0 
 18       2.8        6.4        5.0        4.4        3.8        8.1        3.8 
 19       2.2        1.7        1.9        1.9        2.4        2.7        2.2 
 21      11.4        9.4        8.4        8.3        8.1        8.5       10.0 
 22       7.2        6.1        7.6        6.9        5.6        6.0        6.5 
 23      26.1       26.2       25.7       13.8        8.8       10.5       12.3 
 24       4.8        4.1        5.3        5.3        4.2        3.7        3.9 
 25       5.7        4.7        3.9        5.0        3.8        4.4        4.1 
 26       3.1        3.4        3.3        2.8        3.3        3.4        3.2 
 27       5.2        5.6        2.9        3.4        3.5        3.4        3.6 
 29       2.4        2.0        2.3        3.0        2.6        3.2        2.5 
 30       6.9        7.4        6.1        5.7        5.7        4.7        4.1 
 31       4.5        3.0        3.2        3.3        3.7        3.5        4.3 
_______________________
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES

global:   algo ankr areq asc1 bahr bogt braz brus cas1 casa chat coco dav1 dgar fair flin fort gode gol2 guam hart hob2 iisc irkt kely kerg kiru kit3 kokb kosg kwj1 lhas mac1 madr mali mas1 mcm4 mkea noto nyal ohig pama pert pol2 rcm6 reyk sant shao thu1 tid2 trom usud wtzr wuhn xian yar1 yell

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