[IGSREPORT-99] JPL analysis report (week 678)
David
David
Thu Jan 21 13:51:05 PST 1993
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IGS Electronic Report 21-JAN-1993 13:51:05 Message Number 99
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From: David C Jefferson
Subject: JPL analysis report (week 678)
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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
______________________________________________________________________________
jpl06787.sum This text file.
jpl06787.erp Earth rotation parameters for GPS week 678.
jpl06787.sp1 GPS ephemerides for GPS week 678, sp1 format.
jpl06787.sp3 " " " " " " , sp3 " .
______________________________________________________________________________
For this week's analysis, we continue to deweight data from PRN11/GPS08, as
its repeatablilty results remain at the few-meter level. Additionally, we
begin to include results for the recently launched PRN29/GPS29. Because our
analysis indicates several-meter-level daily repeatabilities for this new
satellite, we will deweight its data for a while. It should be noted as well
that solar radiation pressure was estimated as a constant (instead of
stochastically) for this satellite. Future analyses will utilize stochastic
estimation. Finally, PRN12/GPS10 exhibits unmodelled behavior on January 5
(day 005); deweighting its data did not improve its orbit comparison results.
A preliminary review of our results revealed that there was an approximate
1.2-ms drift in the receiver clock at FAIR (Fairbanks, Alaska) on January 6
(day 006). The clock continued to be anomalous on the next day as well.
Because of this, and also due to a significant absence of tracking data from
FAIR on January 8 and 9, we have changed our reference clock to ALGO (Algonquin
Park, Ontario, Canada) as of January 6, 1993.
Beginning this week, JPL has modified its "GROUND STATION INCLUSION TABLE".
Actually, this new version is simply a more informative variation of the
original. A particular station's presence on any given day is now indicated by
a number, instead of just an 'X'. This number is a percentage, and reflects how
much data from a station was used for the corresponding date of analysis. These
percentages are based on a "normal" number (M) of total GPS measurements
(pseudorange and carrier phase) from all of the regularly used ground sites,
and exclude those measurements rejected as outliers by our software. After
monitoring about 6 weeks of daily analysis results, it was determined that:
M =~ 3400 measurements
[Because we use a 5-minute data interval, of which there are 360 in each
30-hr period, the 3400 means that stations, on the average, typically
see 3400/(360*2) =~ 5 satellites at any given time. The factor of two
accounts for the two data types.]
For example:
The column for January 5 indicates that, for JPLM, 0.96 * 3400 =~ 3264
measurements were used over the 30-hour processing interval. In general,
the number is:
% Data Used = (n/M)*100 = (n/3400)*100,
where n is the number of measurements for an individual site.
As with the previous Site Inclusion Table, a blank entry indicates that there
were no data used over the entire 30-hr period of analysis for that station/day,
and asterisks mark constrained stations.
-----------------
WARNING: PRN's 11 and 29 (GPS08 and GPS29) show unmodeled behavior at the meter- level for week 678 and have been deweighted.
WARNING: FAIR exhibits anomalous clock behavior starting 1/6/93; consequently, JPL has changed its reference clock from FAIR to ALGO as of this date.
JPL LODR TABLE GPS week 678 (1993 Jan 03 - Jan 09)
MJD LODR +/-
(ms/day)
48990.5 2.44 0.05
48991.5 2.56 0.05
48992.5 2.39 0.06
48993.5 2.68 0.05
48994.5 2.56 0.05
48995.5 2.23 0.05
48996.5 2.27 0.05
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 678 (1993 Jan 03 - Jan 09)
MJD X Y UT1R-UTC XSIG YSIG UTSIG RMS XYC XUC YUC STA SAT PASS
'' '' sec '' '' sec
48990.5 .20990 .35151 .06232 .00017 .00015 .00000 .0 -.08 .00 .00 25 21 0
48991.5 .20998 .34859 .06004 .00016 .00015 .00000 .0 -.06 .00 .00 25 21 0
48992.5 .21030 .34658 .05777 .00017 .00016 .00000 .0 -.01 .00 .00 26 21 0
48993.5 .21071 .34394 .05549 .00013 .00014 .00000 .0 .01 .00 .00 28 21 0
48994.5 .21100 .34115 .05321 .00015 .00017 .00000 .0 .08 .00 .00 28 21 0
48995.5 .21144 .33808 .05092 .00014 .00016 .00000 .0 .09 .00 .00 27 21 0
48996.5 .21269 .33568 .04864 .00013 .00015 .00000 .0 .09 .00 .00 26 21 0
END UTPM TABLE
The following table indicates the "3-dimensional orbit repeatability", as
defined in IGS Mail Message 37, for GPS week 678:
["3d rss" = sqrt(xrms**2 + yrms**2 + zrms**2)]
JPL ORBIT REPEATABILITY TABLE GPS week 678 (1993 Jan 03 - Jan 09)
93 1 3 93 1 4 93 1 5 93 1 6 93 1 7 93 1 8 93 1 9
prn 3d rss (m)
2 0.66 0.46 0.65 0.67 0.47 0.33 1.14
3 0.34 0.29 0.33 0.42 0.46 0.49 0.73
11 2.04 1.97 1.58 2.69 1.34 1.76 1.84
12 0.69 1.08 11.56 4.42 0.79 0.52 0.47
13 0.36 0.38 0.57 0.70 0.47 0.61 0.48
14 0.44 0.23 0.59 0.85 0.47 0.54 0.59
15 0.44 0.42 0.36 0.82 0.35 0.22 0.43
16 0.12 0.25 0.22 0.55 0.33 0.45 2.65
17 0.20 0.41 0.24 0.50 0.50 0.27 0.92
18 0.19 0.24 0.29 0.43 0.19 0.43 0.39
19 0.16 0.17 0.24 0.46 0.21 0.19 0.50
20 0.30 0.43 0.30 0.66 0.41 0.39 0.48
21 0.41 0.55 0.38 0.57 0.30 0.30 0.31
23 0.63 0.83 0.81 0.79 0.55 0.75 0.68
24 0.14 0.23 0.35 0.67 0.26 0.34 0.24
25 0.29 0.48 0.29 0.35 0.36 0.40 0.20
26 0.20 0.41 0.57 0.78 0.47 0.35 0.79
27 0.25 0.24 0.27 0.55 0.28 0.24 1.36
28 0.51 0.33 0.30 0.62 0.28 0.38 0.68
29 178.78 3.03 2.32 2.55 3.34 3.77 8.17
32 0.33 0.47 0.34 0.51 0.33 0.29 0.30
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 3 93 1 4 93 1 5 93 1 6 93 1 7 93 1 8 93 1 9
prn 3d rss (m)
2 5.2 4.6 4.2 5.6 6.1 6.9 5.5
3 14.4 13.0 12.0 13.7 15.7 15.1 14.4
11 8.9 14.3 13.8 9.93 13.4 6.6 9.5
12 7.5 10.4 9.9 13.3 15.6 12.5 15.3
13 5.4 6.2 7.1 3.1 2.5 3.7 2.8
14 12.4 9.5 5.9 7.4 5.5 8.3 5.0
15 3.6 3.5 5.2 4.9 5.4 7.4 5.4
16 4.4 3.9 4.0 4.2 3.9 4.3 4.5
17 3.0 4.3 2.9 3.5 3.8 3.6 4.1
18 3.9 3.6 7.6 8.3 9.3 7.4 7.7
19 4.7 5.0 5.9 6.1 5.2 5.1 9.9
20 6.1 6.8 6.1 6.2 6.5 7.0 5.4
21 5.1 4.8 2.9 2.4 4.0 4.3 3.0
23 4.8 3.1 3.4 3.6 4.9 4.5 3.8
24 6.6 5.8 6.4 6.1 6.3 8.0 8.9
25 7.7 6.7 7.3 6.3 6.8 7.5 7.3
26 2.6 2.8 2.7 2.5 2.9 4.8 4.6
27 17.0 16.4 15.5 16.7 16.3 16.1 18.1
28 6.9 2.7 6.5 4.6 11.1 7.3 6.9
29 24.8 28.4 24.9 26.0 41.6 49.9 42.4
32 11.1 15.6 11.6 9.4 7.0 9.4 9.4
END COMPARISON OF BROADCAST NAVIGATION MESSAGE WITH PRECISE EPHEMERIDES
The following table, as explained above, indicates which tracking sites were
used in this week's analysis:
JPL GROUND STATION INCLUSION TABLE GPS week 678 (1993 Jan 03 - Jan 09)
93 1 3 93 1 4 93 1 5 93 1 6 93 1 7 93 1 8 93 1 9
site % data
ALBH 104 105 105 107 108 108 107
ALGO* 96 91 86 89 91 94 107
CANB 102 74 92 100 102 102 103
FAIR* 104 105 90 99 92 9
GOLD 104 104 102 102 88 9 69
HART* 111 111 108 108 111 111 111
JPLM 98 99 96 57 12 101 112
KOKB 17 102 108 114 104
KOSG 46 65 108 64 41 20 99
KOUR 109 110 113 112
MADR* 100 101 98 100 102 100 99
MASP 94 109 111 111
MATE 107 103 90 102 92 100 108
MCMU 124 127 122 122 85 127 127
METS 110 109 106 110 111 111 113
ONSA 94 97 96 95 104 109 96
PAMA 101 103 99 101 103 102 101
PENT 61 30 103 103 103 100 96
RCM2 98 104 101 107 107 109 108
SANT* 109 110 108 111 113 113 113
STJO 103 104 99 103 104 101 102
TAIS 106 100 90 9 82 106 105
TROM* 107 120 118 123 123 125 125
USUD 108 109 109 106 109 110 108
WETB 101 98 96 98 103 105 108
YAR1* 93 91 89 84 6
YELL 59 81 100 113 111 116 114
_______________________
*Indicates fiducial site.
END GROUND STATION INCLUSION TABLE
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