[IGSMAIL-186] JPL Epoch '92 Re-analysis
James
James
Thu Jan 28 00:00:00 PST 1993
From: James F Zumberge
Subject: JPL Epoch '92 Re-analysis
-----------------------------------
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
starr at logos.jpl.nasa.gov):
______________________________________________________________________________
filename contents
______________________________________________________________________________
jplepoch92.sum This text file.
jplepoch92.erp Earth rotation parameters for Epoch '92.
jplepoch92.sp1 GPS ephemerides for Epoch '92, sp1 format.
jplepoch92.sp3 " " " " " , sp3 " .
______________________________________________________________________________
These files contain the results of our re-analysis of the Epoch '92
period, 1992 Jul 26 through 1992 Aug 07, with our most recent analysis
strategy. Because of AS, the days of Aug 1, Aug 2, and Aug 8 were not
analyzed.
This submission resembles a normal weekly one. In the UTPM table,
the UT1R-UTC column contains the assumed nominal values from IERS Bulletin-B
finals (_not_ predicts).
The new polar motion estimates differ from the original "near-real-time"
values as indicated in the following table:
delta X (mas) delta Y (mas)
average 0.07 -0.43
st deviation 0.40 0.30
Shown below is a comparison of the new ephemerides with the original
ones. Actually, the comparison is with the cleansed originals (refer to
IGS Message Nos. 127 and 164), and explains the absence of an entry for
prn 15 on Jul 26. Each entry in the table represents, for the
indicated prn and day, the 3d rss difference over 24 hours between the
current Epoch '92 analysis and the original analysis.
The ~3.5-m 3d-rss difference for Jul 26-30 changes abruptly to ~1.1 m on
Jul 31, because of a change in the nominal earth-orientation values in
the original processing (caused by an update in the IERS B predicts),
and because the original processing used the nominal (not solved-for)
earth orientation in the transformation from inertial to earth-fixed
coordinates. The values used on Jul 31 and later for the original
analysis are very close to the IERSB Final values used in the current
re-analysis.
The ~1.1-m comparison for Jul 31 and later (with some exceptions, to be
discussed), is due mainly to the change in convention from referring to
the antenna phase center (our original convention) to the spacecraft
center of mass (the current convention).
The comparison for Monday, Aug 3 shows mixed results. Because A-S was
in effect for the first 10 hours of this day, cross-correlated data from
Block-II satellites were not used, as reflected in the data availability
tables at the end of this file. Because the comparisons are over a
24-hr period, some of the Block-II results come from extrapolations.
For example, the value of 9.2 m for prn 25 becomes 1.3 m if differences
before 10 am are excluded.
Finally, the outlier of 26.6 m from prn 15 on Aug 6 is a result of
our deweighting data from that prn and day in our original submission.
It is modeled perfectly well with the current estimation strategy.
COMPARISON OF EPOCH '92 ORBITS WITH ORIGINAL "NEAR-REAL-TIME" ORBITS
92 7 26 92 7 27 92 7 28 92 7 29 92 7 30 92 7 31
prn 3d rss (m)
2 3.6 3.6 3.6 3.6 3.7 1.1
3 3.4 3.6 3.6 3.6 3.8 1.0
11 3.5 3.5 3.7 3.8 3.8 1.0
12 3.7 3.7 3.7 3.8 3.9 1.0
13 3.6 3.4 3.7 3.8 3.8 1.0
14 3.4 3.6 3.6 3.7 3.8 1.1
15 3.5 3.7 3.9 3.8 1.0
16 3.5 3.6 3.6 3.8 3.8 1.1
17 3.2 3.3 3.3 3.4 3.5 1.1
18 3.4 3.5 3.5 3.6 3.7 1.1
19 3.4 3.4 3.5 3.6 3.6 1.0
20 3.5 3.6 3.6 3.7 3.8 1.2
21 3.5 3.4 3.4 3.6 3.7 1.1
23 3.5 3.5 3.6 3.7 3.7 1.1
24 3.3 3.3 3.4 3.5 3.6 1.0
25 3.4 3.5 3.5 3.7 3.8 1.0
28 3.5 3.5 3.6 3.7 3.8 1.1
92 8 3 92 8 4 92 8 5 92 8 6 92 8 7
prn
2 2.4 1.1 1.1 1.1 1.1
3 0.9 0.9 0.9 1.0 0.9
11 1.0 1.0 1.0 1.0 1.0
12 1.0 1.0 1.0 1.0 1.0
13 1.0 1.0 1.0 1.0 1.0
14 1.1 1.0 1.1 1.1 1.1
15 1.1 1.1 1.1 26.6 1.1
16 4.6 1.0 1.0 1.0 1.1
17 1.8 1.1 1.1 1.1 1.1
18 1.1 1.1 1.2 1.1 1.2
19 1.1 1.1 1.1 1.1 1.1
20 5.5 1.1 1.1 1.2 1.2
21 4.0 1.1 1.1 1.1 1.0
23 3.6 1.1 1.1 1.2 1.1
24 1.6 1.2 1.2 1.1 1.1
25 9.2 1.0 1.1 1.1 1.1
28 5.2 1.1 1.1 1.1 1.1
END COMPARISON OF EPOCH '92 ORBITS WITH ORIGINAL "NEAR-REAL-TIME" ORBITS
JPL LODR TABLE Epoch '92 (1992 Jul 26 - Aug 07)
MJD LODR +/-
(ms/day)
48829.5 1.54 0.05
48830.5 1.55 0.05
48831.5 1.52 0.05
48832.5 1.24 0.05
48833.5 1.42 0.05
48834.5 1.44 0.05
48837.5 1.44 0.07
48838.5 1.86 0.05
48839.5 1.89 0.05
48840.5 1.90 0.05
48841.5 1.75 0.05
END LODR TABLE
NOTE: In the following table, UT1R-UTC are the assumed nominal values from
IERS Bulletin-B finals; estimated LODR values are given in the previous
table. See IGS Mail Message 97 for details.
JPL UTPM TABLE Epoch '92 (1992 Jul 26 - Aug 07)
MJD X Y UT1R-UTC XSIG YSIG UTSIG RMS XYC STA SAT
'' '' sec '' '' sec
48829.5 -.09972 .43566 .40824 .00013 .00015 .00000 .0 .00 29 18
48830.5 -.09792 .43761 .40681 .00013 .00014 .00000 .0 .01 29 18
48831.5 -.09581 .43903 .40540 .00014 .00015 .00000 .0 -.03 29 18
48832.5 -.09443 .44105 .40398 .00014 .00014 .00000 .0 .01 28 18
48833.5 -.09255 .44300 .40254 .00013 .00014 .00000 .0 .03 29 18
48834.5 -.09007 .44511 .40105 .00013 .00014 .00000 .0 .04 29 18
48837.5 -.08291 .45154 .39646 .00028 .00031 .00000 .0 -.04 29 18
48838.5 -.08187 .45416 .39489 .00013 .00014 .00000 .0 .01 29 18
48839.5 -.08015 .45586 .39329 .00014 .00015 .00000 .0 -.03 29 18
48840.5 -.07820 .45779 .39166 .00014 .00015 .00000 .0 .01 28 18
48841.5 -.07643 .45993 .39001 .00015 .00017 .00000 .0 .03 28 18
END UTPM TABLE
The following table indicates the "3-dimensional orbit repeatability", as
defined in IGS Mail Message 37, for the Epoch '92 period, 1992 Jul 26 - Aug 07:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]
JPL ORBIT REPEATABILITY TABLE Epoch '92 (1992 Jul 26 - Aug 07)
92 7 26 92 7 27 92 7 28 92 7 29 92 7 30 92 7 31
prn 3d rss (m)
2 0.3 0.20 0.57 0.51 0.35 0.4
3 0.2 0.28 0.45 0.42 0.48 0.5
11 0.3 0.30 0.64 0.46 0.30 0.2
12 0.2 0.33 0.47 0.43 0.27 0.1
13 0.3 0.33 0.35 0.39 0.24 0.2
14 0.3 0.47 0.41 0.36 0.32 0.3
15 0.9 0.54 0.87 0.86 0.69 0.4
16 0.1 0.21 0.21 0.25 0.26 0.3
17 0.2 0.15 0.26 0.20 0.32 0.3
18 0.3 0.34 0.41 0.40 0.53 0.4
19 0.3 0.23 0.38 0.57 0.22 0.3
20 0.2 0.27 0.24 0.28 0.29 0.4
21 0.3 0.39 0.69 0.27 0.20 0.1
23 0.3 0.31 0.37 0.37 0.26 0.3
24 0.3 0.28 0.20 0.26 0.40 0.3
25 0.2 0.30 0.31 0.62 0.76 0.6
26 0.6 0.28 0.40 0.43 0.44 0.3
28 0.2 0.30 0.29 0.27 0.28 0.2
92 8 3 92 8 4 92 8 5 92 8 6 92 8 7
prn
2 0.4 0.22 0.19 0.22 0.2
3 0.1 0.24 0.31 0.37 0.2
11 0.2 0.27 0.17 0.15 0.1
12 0.4 0.41 0.38 0.37 0.5
13 0.3 0.32 0.33 0.31 0.3
14 0.3 0.32 0.31 0.22 0.3
15 0.4 0.89 0.60 0.31 0.3
16 0.2 0.30 0.12 0.26 0.3
17 0.2 0.21 0.15 0.28 0.2
18 0.5 0.47 0.43 0.56 0.6
19 0.5 0.48 0.37 0.42 0.2
20 0.4 0.51 0.23 0.36 0.3
21 0.3 0.32 0.23 0.23 0.1
23 0.2 0.34 0.34 0.31 0.2
24 0.2 0.29 0.27 0.26 0.3
25 0.1 0.52 0.46 0.25 0.3
26 0.4 0.38 0.26 0.48 0.4
28 0.2 0.28 0.26 0.29 0.2
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
92 7 26 92 7 27 92 7 28 92 7 29 92 7 30 92 7 31
prn 3d rss (m)
2 4.3 4.7 3.5 3.7 4.0 3.7
3 10.1 10.1 9.8 9.7 9.6 9.5
11 7.4 4.6 3.7 8.8 10.1 5.7
12 10.0 8.4 8.5 10.7 13.3 14.2
13 8.69 8.1 6.7 5.97 10.3 6.6
14 4.5 7.2 8.1 4.4 4.4 5.9
15 6.1 8.9 9.7 9.8 9.7 5.8
16 8.0 10.7 8.8 6.7 7.3 7.1
17 4.6 5.4 9.2 7.3 7.9 6.1
18 4.5 4.7 4.8 4.7 5.1 4.1
19 6.5 4.8 2.9 2.5 4.5 5.0
20 3.7 3.5 4.5 3.7 5.2 4.9
21 5.3 5.4 4.0 5.3 7.3 6.4
23 11.9 10.4 5.8 3.7 3.4 4.4
24 14.4 14.5 14.9 16.1 15.9 14.3
25 7.0 7.4 9.8 14.7 14.3 8.9
26 24.5 22.5 20.3 20.0 14.2 20.0
28 3.3 2.9 3.4 3.5 3.0 3.7
92 8 3 92 8 4 92 8 5 92 8 6 92 8 7
prn
2 3.6 3.8 4.8 5.3 5.3
3 8.1 12.9 8.4 9.7 13.3
11 8.1 9.5 8.7 7.6 7.8
12 8.1 13.1 7.5 22.0 7.8
13 6.6 7.1 6.0 8.3 9.8
14 8.2 8.1 7.5 6.5 7.1
15 8.0 7.5 6.2 5.3 5.6
16 7.0 8.5 8.2 11.3 9.4
17 6.1 8.4 6.5 6.0 5.5
18 3.5 4.5 5.0 6.3 9.5
19 3.7 3.5 4.1 3.7 3.8
20 3.6 3.6 4.4 6.0 3.3
21 8.2 8.3 6.9 5.4 4.1
23 3.3 7.4 9.5 8.2 7.3
24 11.4 10.8 10.6 11.1 12.3
25 7.6 11.7 12.0 9.3 9.9
26 9.3 8.1 7.6 9.1 5.3
28 2.6 3.1 4.0 2.8 2.9
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 the Epoch '92 analysis:
JPL GROUND STATION INCLUSION TABLEs Epoch '92 (1992 Jul 26 - Aug 07)
92 7 26 92 7 27 92 7 28 92 7 29 92 7 30 92 7 31
ALBH 93 95 92 93 95 89
ALGO* 97 94 86 79 78 82
CANB 69 93 93 93 94 93
FAIR* 98 98 92 90 98 99
GOLD 78 87 0 89 92 88
HART* 91 92 76 91 92 88
HERS 82 83 81 82 82 77
JPLM 92 94 91 90 98 93
KOKB* 92 89 88 90 94 94
KOSG 90 88 83 88 91 90
MADR* 58 90 90 91 84 86
MASP 96 99 96 99 99 94
MATE 91 91 90 90 91 87
MCMU 77 99 102 108 108 107
METS 95 98 96 98 100 95
NALL 72 0 70 74 0 84
ONSA 95 84 89 90 91 92
PAMA 83 84 79 80 82 81
PENT 97 97 94 95 96 97
PINY 95 95 94 96 98 99
RCM2 94 96 90 91 94 65
SANT* 91 92 92 0 91 90
STJO 94 93 91 94 96 90
TAIS 84 85 81 82 72 77
TROM* 107 109 106 106 107 107
USUD 0 10 0 0 0 54
WETB 91 91 27 0 0 82
YAR1* 91 90 86 89 91 90
YELL 101 98 101 101 102 98
92 8 3 92 8 4 92 8 5 92 8 6 92 8 7
ALBH 70 97 97 97 96
ALGO* 58 88 85 90 89
CANB 62 86 93 92 92
FAIR* 72 98 99 100 94
GOLD 63 77 46 47 45
HART* 52 88 87 88 86
HERS 0 83 83 83 78
JPLM 68 93 95 96 92
KOKB* 69 94 93 94 90
KOSG 64 91 91 91 90
MADR* 49 87 87 82 64
MASP 61 89 10 0 0
MATE 59 83 85 91 87
MCMU 80 109 109 109 108
METS 70 101 101 101 96
NALL 0 49 0 103 110
ONSA 57 94 90 82 97
PAMA 63 91 92 43 0
PENT 68 98 100 99 99
PINY 68 99 98 96 90
RCM2 54 91 92 92 88
SANT* 0 92 92 92 88
STJO 63 94 96 96 90
TAIS 56 85 0 87 87
TROM* 76 107 106 107 103
USUD 47 86 85 89 65
WETB 63 91 92 92 87
YAR1* 69 80 92 93 94
YELL 71 98 101 104 97
_______________________
*Indicates fiducial site.
END GROUND STATION INCLUSION TABLEs
More information about the IGSMail
mailing list