Author: AC Coordinator / AIUB/CODE
Rapid IGS Orbit Combination - Week 1179 Day: 0 (Aug 11, 2002)
Contacts: R. Weber (rweber@luna.tuwien.ac.at),
U. Hugentobler (urs.hugentobler@aiub.unibe.ch),
H. Bock (bock@aiub.unibe.ch),R. Dach (dach@aiub.unibe.ch)
COMBINATION STRATEGY:
For a complete description of the combination strategy along with all tables
and statistics, please refer to the IGS Final Combination reports posted on
CDDIS within 13 days after the end of the GPS week.
REMARKS on IGS Rapid Orbit Combination:
1. Broadcast ("brd") orbits/clocks are included in the combination for
statistics only. However broadcast clock corrections are used for clock
alignment to GPS time and centre clock weight determination purposes.
2. The following IGR 2-day prediction and IGU Ultra rapid 1-day prediction
orbits/clocks were excluded from the combination but kept for statistics:
-> Centre: IGU
3. The following centre clock solutions, which provide broadcast clock
corrections, were excluded from the combination but kept in the combination
statistics:
-> Centre: NGS
4. The following clock solutions were excluded from the combination because
they were biasing the combined clock solutions.
Centre | PRN/STA list
-------+---------------
ESA | ALGO AUCK
GFZ | MAC1 MALI
JPL | KERG PIE1
USN | 13 21 KERG
5. Starting on 02-Dec-2001 (GPS Week 1143, day 0, MJD 52245) all IGS
products, including the IGS combined orbits, are based on the IGS
realization of the ITRF2000 reference frame (IGS00). For more information
see IGSMAIL #3605.
6. Starting on 5-Nov-2000 (GPS Week 1087, day 0; mjd=51853) all IGS clock
products are based on the new clock combination scheme which uses the
the clock RINEX files as input if available, otherwise SP3 clocks are used.
The navigation solution is still based on the SP3 clocks but this will
soon adopt the clock RINEX files as well.
7. Starting on 29-Nov-1998 (GPS Week 986, day 0; mjd=51146) all IGS clock
products reflect the use of the following antenna phase center offsets
(satellite fixed reference frame):
Block II/IIA: 0.279 0.000 1.023 X, Y, Z in meters
Block IIR : 0.000 0.000 0.000 X, Y, Z in meters
_______________________________________________________________________________
Table 1: Daily transformation of each centre to the combined IGR orbit and
clocks.
WRMS - RMS weighted by the centres SP3 header accuracy codes.
STA - Number of stations in the daily solutions.
Units: meters, mas, ppb, nano-sec, nano-sec/day.
Table 1.1179.0 GPS week: 1179 Day: 0 MJD: 52497.0
CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS | TOFT TDRFT RMS
--------|------------------------------------------------|---------------------
brd n/a|0.09 0.09 0.16 -0.11 -2.32 -2.00 5.8 2.20 2.20 | -0.3 0.8 4.26
cod 114|0.00-0.01-0.01 0.00 -0.07 0.10 -0.3 0.03 0.03 | -0.4 1.2 0.07
emr 31 |0.01 0.00 0.01 0.05 0.01 -0.01 0.5 0.04 0.04 | 143.6 12.4 0.05
esa 45 |0.00 0.00 0.01 0.03 -0.01 -0.06 0.1 0.08 0.08 | -1.1 -0.1 0.11
gfz 34 |0.00 0.00 0.01 -0.06 -0.18 0.00 -0.3 0.04 0.04 | -0.5 0.8 0.08
igu n/a|0.00-0.01 0.01 -0.33 0.53 0.15 0.2 0.22 0.13 | -0.3 0.8 6.31
jpl 39 |0.00 0.00 0.00 -0.05 0.16 -0.07 0.2 0.03 0.03 | 0.3 3.0 0.05
ngs 57 |-.01 0.00-0.02 0.10 0.05 -0.16 0.3 0.08 0.08 | -0.3 0.9 3.96
sio 32 |0.00-0.01-0.01 -0.04 0.25 0.11 -0.5 0.06 0.06 | 0.0 0.0 0.00
usn 34 |-.01 0.02 0.02 0.00 -0.11 -0.08 0.2 0.06 0.05 |-1496.3 -31.0 0.08
Table 2: Daily fit for each satellite and each centre resulting from weighted
average combination.
The last column gives the IGR resulting satellite accuracy measures
found in the IGR SP3 header. Eclipsing satellites are flagged with
and "E" beside the PRN number. "X" stands for excluded from RMS,
WRMS and MEDIan combination statistics but included in IGR orbit.
"MEDI" stands for median of the centre's satellite RMS.
Units: cm.
Table 2.1179.0 GPS week: 1179 Day: 0 MJD: 52497.0
Weighted Average
PRN | brd cod emr esa gfz igu jpl ngs sio usn IGR |
------|----------------------------------------------|
1 | 297 3 3 5 3 4 2 5 4 3 1 |
2 | 172 4 3 8 3 --- 3 7 5 4 2 |
3 | 136 4 3 5 5 10 3 10 4 4 2 |
4E | 387 4 4 10 6 21 3 12 4 4 2 |
5 | 199 3 3 6 4 12 2 5 6 4 1 |
6 | 267 3 3 4 3 18 3 10 4 5 2 |
7 | 75 3 4 9 5 9 2 9 6 4 2 |
8E | 260 3 5 6 6 62 4 7 4 5 2 |
9E | 238 3 4 11 3 12 3 9 4 4 2 |
10 | 101 3 3 8 3 3 2 7 3 5 1 |
11 | 152 3 4 11 5 32 3 10 7 5 2 |
13 | 135 4 4 8 4 8 4 7 8 20 3 |
X14 | 160 4 4 7 5 8 3 10 --- 3 2 |
X15E | 322 3 5 --- 5 28 2 7 5 6 2 |
17E | 403 4 6 12 4 34 4 8 7 6 2 |
18 | 143 4 7 8 4 6 4 8 8 6 2 |
20 | 278 3 4 5 3 8 4 6 6 5 2 |
X21 | 649 5 3 21 4 --- 3 9 --- 24 4 |
22 | 122 3 3 7 4 6 3 10 8 3 2 |
23 | 228 4 3 9 4 18 2 8 4 4 2 |
24E | 283 3 4 13 8 30 4 8 7 3 2 |
25E | 175 3 3 5 2 24 4 11 6 4 2 |
26 | 120 3 3 7 3 5 2 3 4 5 1 |
27E | 136 3 5 7 6 39 4 7 4 5 2 |
28 | 111 4 5 6 5 29 5 6 7 7 2 |
29 | 216 3 3 5 4 14 2 3 4 5 1 |
30 | 89 2 3 7 3 3 3 5 7 5 1 |
31 | 307 4 3 6 4 9 3 7 8 3 2 |
------|----------------------------------------------|
RMS | 220 3 4 8 4 22 3 8 6 6 |
WRMS | 220 3 4 8 4 13 3 8 6 5 |
MEDI | 187 3 4 7 4 12 3 8 6 5 |
Table 3: Daily Precise Navigation Summary using the corresponding Centre orbit
positions and satellite clock corrections at 15 min intervals.
Each line gives the daily station RMS w.r.t. the estimated coordinates
for the Latitude, Longitude and Height components.
CLK - Satellite clocks used.
EPO - Number of satellite clock epochs available for that day.
Units: centimetres.
Table 3.1179.0 GPS week: 1179 Day: 0 MJD: 52497.0
CENT| CLK EPO | BRUS | TOW2 | WILL |
----|----------|----------------|----------------|----------------|
cod | cod 2671 | 1 1 3 | 1 1 3 | 2 2 4 |
emr | emr 2656 | 2 2 4 | 2 2 11 | 3 2 5 |
esa | esa 2537 | 1 2 3 | 3 4 8 | 2 3 5 |
gfz | gfz 2652 | 1 2 3 | 2 3 7 | 3 2 5 |
igr | igr 2668 | 1 2 3 | 1 2 7 | 2 2 4 |
jpl | jpl 2656 | 2 2 3 | 2 2 8 | 3 2 5 |
usn | usn 2654 | 2 2 3 | 2 3 13 | 3 2 4 |
Table 4: Earth Orientation Parameters daily summary.
Daily Centre ERP, ERP Rates and LOD differences with respect to
IGR combined values.
Xpole,Xrt: x pole and x pole rate (10**-5")
Ypole,Yrt: y pole and y pole rate (10**-5"/day)
LOD: Length Of Day (us)
AC LOD BIAS: 21-day mean LOD bias with respect to Bulletin A (us)
AC LOD BIAS RMS: RMS of AC LOD BIAS (us)
FLAG: "u" (used), "x" (excluded), "-" (no submission)
for Xpole, Ypole, Xrt, Yrt and LOD
A star ("*") beside the AC name indicates that AC LOD values were
derived from AC UT1-UTC values.
Table 4.1179.0 GPS week: 1179 Day: 0 MJD: 52497.5
AC LOD AC LOD
CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS
------------------------------------------------------------------------
cod uuuuu | 6 -7 -3 -4 1 | -6 19
emr uuuuu | 5 -5 33 63 25 | 33 44
esa uuuuu | -2 -33 -51 -36 15 | 34 39
gfz uuuuu | 18 10 19 -43 -27 | 11 27
igu xxxxx | -53 26 -73 -29 22 | 1 38
jpl uuuuu | -19 2 -13 -20 55 | -20 95
ngs uuuux | 7 7 45 85 143 | -7 66
sio uuxxu | -25 26 -7 -294 -12 | -9 33
usn uuuuu | 7 -8 -43 -5 42 | 45 54