[IGSREPORT-1267] Wk 0767 JPL Analysis Report
D.C.
D.C.
Wed Oct 5 10:20:08 PDT 1994
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IGS Electronic Report Wed Oct 5 10:20:08 PDT 1994 Message Number 1267
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Author: D.C. Jefferson, Y.E. Bar-Sever, J.F. Zumberge
Subject: Wk 0767 JPL Analysis Report
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JPL ANALYSIS REPORT GPS-WEEK 0767 (DAYS 261-267, DATES 1994 Sep 18 - Sep 24)
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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: djeff at cobra.jpl.nasa.gov]
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