[IGSREPORT-224] ESA analysis report (week 0691)
J.
J.
Fri Apr 16 21:01:49 PDT 1993
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IGS Electronic Report 16-APR-1993 21:01:49 Message Number 224
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From: J. Feltens
Subj: ESA analysis report (week 0691)
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ANALYSIS CENTRE: ESA/ESOC
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OUTLINE OF THE ESTIMATION OF GPS-ORBITS AND EARTH ROTATION PARAMETERS
AT THE ESOC PROCESSING CENTRE FOR IGS
J.M.Dow, J.Feltens, T.Martin-Mur, C.Garcia-Martinez
Description of analysis for period 1993 April 04 - April 10
(week 0691)
1. SOFTWARE USED: GPSOBS/BAHN-Version 5
2. MODELS USED AND PARAMETERS ESTIMATED/FIXED:
3. REMARKS: From the beginning of week 0691 on we have changed our esti-
mation strategy. First we have reduced our number of ground
stations to a total number of 19 (see table attached). In
agreement with decisions at the IGS workshop in Berne, 12
ground stations (as indicated in the table) are kept fixed.
Concering troposheric modelling, per ground station
2 parameters are estimated every 6 hours (Willmann Model).
The first parameter is the zenith delay, and the second is a
shape factor which enables a finer tropospheric modelling
especially at low elevations.
The observations used are double differenced carrier
phases in ionosphere-free combination with a 6-minute samp-
ling rate.
The GPS data is evaluated in 48-hour-arcs, so that over-
laps of 12 hours between successive days are obtained:
day(i-1) day(i) day(i+1) day(i+2)
| ------|xxxxxxxxxxxx|------ |
| ------|xxxxxxxxxxxx|------ |
where day no.: i
48-hour arc: ------|xxxxxxxxxxxx|------
central day: 12 h xxxxxxxxxxxx 12 h
overlap: ------ 24 h ------
The EOPs obtained are referred to the central day.
The following a priori constraints are given a-priori to the
estimated parameters:
Satellite position: +- 100 <m>
velocity: +- 1 <m/s>
ROCK4(2) scaling factor: +- 10 % deviation
from value 1
Y-bias: +- 0.1E-05 <Newton>
EOPs xp: +- 3 <m>
yp: +- 3 <m>
d(UT1R-TAI)/dt +- 3 <m>
(3 <m> expresses the a priori sigma as an arc length
referred to the Earth's surface)
Station position: +- 50 <m>
zenith delay +- 20 <cm>
shape factor +- 15 % of initial
value
4. GROUND STATIONS, ESOC Solution SSC (ESOC) 93 P 01
____________________________________________________________
GPSweek|ALGO HART MADR MCMU SANT USUD YELL |f |e |t
0691___| FAIR KOKB MASP PAMA TIDB WETT |i |s |o
|DAY| GOLD KOUR MATE RCM2 TROM YAR1 |x.|t.|t.
---|---|-------------------------------------------|--|--|--
|094| FFF FFe Fee eee FFF eFF F |12| 7|19
|095| FFF FFe Fee eee FFF eFF F |12| 7|19
|096| FFF FFe Fee eee FFF eFF F |12| 7|19
|097| FFF FFe Fee eee FFF eFF F |12| 7|19
|098| FFF FFe Fee eee FFF eFF F |12| 7|19
|099| FFF FFe Fee eee FFF eFF F |12| 7|19
|100| FFF FFe Fee eee FFF eFF F |12| 7|19
with: "F" ... coordinates of ground station kept fixed,
"e" ... coordinates of ground station estimated,
"-" ... ground station not included on that day.
5. ORBIT FIT MINUS EXTRAPOLATION FROM PREVIOUS DAY, RMS IN <METER>
\DAY| 094 095 096 097 098 099 100
\ |
\ |
SAT\|
----|-------------------------------------------
02 | 2.8 1.4 1.3 3.6 3.5 2.1 3.0
03 | 5.7 2.6 0.8 0.6 0.6 0.6 1.2
11 | 3.9 0.9 0.8 2.1 1.1 1.0 1.5
12 | 1.3 1.6 0.9 1.2 0.7 0.6 1.0
13 | 2.9 1.0 0.9 0.6 1.6 1.0 1.4
14 | 4.0 3.2 1.1 2.1 2.9 0.8 1.4
15 | 2.0 1.7 0.5 1.1 0.6 1.2 1.0
16 | 1.9 2.1 3.8 2.5 1.9 2.7 3.5
17 | 1.6 1.5 0.7 1.0 1.0 0.9 1.0
18 | 2.1 1.9 1.2 2.2 3.8 1.7 1.9
19 | 2.7 3.6 0.8 1.1 1.5 0.7 1.4
20 | 2.3 1.2 1.9 1.7 1.0 2.6 0.6
21 | 9.1 1.3 0.7 1.3 1.2 0.7 1.8
22 | 6.9 2.0 2.3 0.8 0.9 1.0 0.7
23 | 1.7 0.9 0.5 0.6 1.0 0.8 1.3
24 | 7.0 0.8 2.3 1.9 1.5 1.2 0.9
25 | 4.7 1.6 0.3 0.8 1.7 1.1 1.4
26 | 6.0 1.4 3.3 2.4 3.5 2.5 3.2
27 | 3.8 0.9 0.8 0.8 1.4 1.2 1.5
28 | 4.2 2.0 4.0 1.6 1.6 2.2 1.0
29 | 5.1 2.2 1.0 1.4 1.7 1.2 1.8
01 | 3.3 1.9 1.0 2.6 7.4 11.3 17.2
6. PRODUCTS GENERATED:
The following products are generated and stored in CDDIS at NASA/GSFC:
ESA0691*.EPH - Precise GPS orbits, *=0 for Sunday,..., 6 for Saturday
ESA06917.ERP - Earth rotation results for week 0691 (including DUT1R)
ESA06917.SUM - This summary file
End of Message
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