[IGSMAIL-1299] Station Report
J
J
Wed May 1 13:41:07 PDT 1996
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IGS Electronic Mail Wed May 1 13:41:07 PDT 1996 Message Number 1299
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Author: J F Zumberge
Subject: Station Report
Date: May 1, 1996
To: IGS Colleagues
Beginning today, as part of the Central Bureau's (CB) task to
"...monitor network operations and quality assurance of data..." (IGS
Terms of Reference), daily and weekly Station Reports are generated by
the Satellite Geodesy and Geodynamics Systems Group at JPL for the CB.
These are available at igscb.jpl.nasa.gov. For example
netscape ftp://igscb.jpl.nasa.gov/igscb/mail/igsnet/weekly/1996-04-21.gz
will display the report for seven days beginning April 21, 1996, and
netscape ftp://igscb.jpl.nasa.gov/igscb/mail/igsnet/daily/1996-04-25.gz
will display the report for the single day April 25, 1996.
(Of course, regular anonymous ftp can be used to retrieve files. Once
logged on to igscb.jpl.nasa.gov, cd to /igscb/mail/igsnet/daily for
daily reports or /igscb/mail/igsnet/weekly for weekly reports.)
Every Wednesday for the week that ended the previous Saturday, a weekly
report is distributed to IGS station operators, the Governing Board, AC
and AAC personnel, and Data Center personnel. The first such report was
mailed earlier today. (If you want to be added to or removed from the
distribution list, send your request to robliu at igscb.jpl.nasa.gov.)
Documentation can be found in
ftp://igscb.jpl.nasa.gov/igscb/data/network/igsnet.doc
which is included below for your convenience.
Sincerely,
Jim Zumberge
________________________________________________________________________
96/04/05
J F Zumberge jfz at cobra.jpl.nasa.gov
This document describes the Station Report that is generated
periodically for the IGS Central Bureau by JPL's Satellite Geodesy and
Geodynamics System (SGGS) Group, based on Rinex data provided by the GPS
Networks and Operations (GNO) Group. An example is given in Table 1.
There are four numeric fields: "overall", "quantity", "quality", and
"latency". Each is a floating point number, although the results are
rounded to the nearest integer. The overall field is the average of the
other three fields. The highest and best value for each field is 10.
Before describing how these numbers are computed, we first refer to the
procedure announced in IGS mail 1187, (Jan 16, 1996):
Rapid precise GPS orbit and clock solutions are now
available from JPL in sp3 format (see below for access
details) within about 20 hours of the close of the UTC day.
These rapid orbits typically agree with the final JPL IGS
orbit to about 20 cm rms. Earth orientation is adjusted in
these solutions and reported to the IGS, IERS, and USNO.
These solutions are used to compute rapid solutions from
over 100 sites daily, including all SCIGN sites in southern
California. These rapid positions typically agree with our
final positions at the sub-cm level. Publicly available
Rinex data from new sites will be processed as the sites
become operational. Results are available upon request for
sites of interest.
A 3-day predicted orbit is also available in the sp3
format. Because of the rapid turn-around, this means that
a real-time orbit, based on extrapolations of between 20
and 44 hours, is available, with an accuracy significantly
better than the broadcast orbits. We find that 24 hour
predicted orbits are typically 50-80 cm, and 48 hour
predictions generally 1-2 meters.
The final JPL IGS orbit and Earth orientation are now
computed with a 4 day lag (access details below). All
sites are also processed using this final orbit, with
ambiguities resolved for regional networks.
One of the results of the "rapid solutions" mentioned in this excerpt is
shown in Table 2. (Several of the fields in the full database from
which Table 2 was extracted can be viewed graphically at
http://milhouse/eng/eng.html.) There is one rapid solution for each
site on each day (assuming that the Rinex file has been made available
to the SGGS Group by the GNO Group). The phase and pseudorange data are
used to estimate the usual receiver-specific parameters: Cartesian
coordinates, receiver clock, and zenith troposphere delay. Transmitter
parameters -- satellite positions and clock corrections -- are fixed at
their values determined in the rapid global solution.
In Table 2, the "number of time tags for which clock solution is valid"
field, call it N, reflects data availability. The normal data rate
analyzed is 5 minutes; there are thus 288 times in a 24-hr period for
which data exists. The value of the "quantity" field is therefore
quantity = <N>/28.8,
where <N> is the average value of N over the period of interest, usually
1 week. This number can be less than 10 if either (a) one or more days
of data are missing or (b) some of the data have been rejected as
outliers.
The quality field is also the average over one or more days of a daily
quality figure. The daily quality figure is based on several
categories. One quality point is awarded on each day for each of the
following conditions:
- there are at least 250 valid clock solutions
- there are fewer than 100 phase bias resets (the last
field in Table 2)
- the 3d formal error of the solution for station location
is less than 1 cm (this field is not in Table 2, but is
in a related database)
- the pseudorange rms residuals (field 8 in Table 2) are
less than 86 cm (this is true 95% of the time), and the
number of pseudorange measurements is at least 90% of
the number of phase measurements
- the phase rms residuals (field 10 in Table 2) are less
than 13 mm (also true 95% of the time)
Thus a site can be awarded up to 5 quality points every day. The
quality field is thus
quality = <P>/0.5,
where <P> is the average number of points awarded over the period
(again, typically a week) reported.
The latency field measures the delay between the beginning of data in
the file and the availability of the file, minus 1 day to account for
the span of the data. A latency database is maintained for each of the
three IGS Global Data Centers. The latency for a given site and day is
the minimum value from the three centers. (If no centers have the data,
then the latency is based on the GNO value.) Very late or missing files
are assumed to have a latency of 100 hr. The latency is calculated as
latency = 10 - <H>/10,
where <H> is the average latency, in hours, over the period.
[A subset of engineering data -- like shown in Table 2 -- can be made
available on request. Questions/comments should be directed to me at
the e-mail address listed above.]
_______________________________________________________________________________
Table 1 Example of Station Report
------------------------------------------------------------------------------
_____________________________________________________________________
Station Report for 7 days beginning 1996-03-24
(generated 1996-04-05 09:38)
NOTICE: The information listed below results from JPL IGS Analysis
Center procedures based on Rinex data available from JPL's GPS Networks
and Operations Group, and does not necessarily reflect the operational
quality of any site.
For all numeric fields, a 10 is the highest (and best), a 0 is the
lowest. The "overall" field is the average of the quantity, quality,
and latency fields. The "quantity" field indicates how much usable data
from the site was available. The "quality" field accounts for amount of
data, number of phase breaks, formal errors of (precise)
point-positioned coordinates, and pseudorange and phase residuals. The
"latency" field will be 10 for a site whose data are available, on
average, within 5 hours of the end of the GPS day. It will be reduced
by 1 point for each additional 10 hours of delay. (More detailed
information can be found in
ftp://igscb.jpl.nasa.gov/igscb/data/network/igsnet.doc.)
_____________________________________________________________________
IGS Fiducial Sites
site overall quantity quality latency agency location
---------------------------------------------------------------------
algo 10 10 10 9 NRCan-GSD Canada
fair 8 9 7 9 JPL USA
gold 8 8 7 7 JPL USA
hart 0 0 0 0 CNES South Africa
kokb 10 10 10 10 JPL USA
kosg 10 10 9 9 DUT The Netherlands
madr 9 9 7 9 JPL Spain
sant 9 10 8 9 JPL Chile
tidb 8 8 6 9 JPL Australia
trom 6 6 5 8 NMA Norway
wett 8 9 7 9 IfAG Germany
yar1 9 10 8 9 JPL Australia
yell 9 8 9 9 NRCan-GSD Canada
_____________________________________________________________________
Other IGS Global Sites
site overall quantity quality latency agency location
---------------------------------------------------------------------
albh 10 10 10 9 NRCan-GSC Canada
ankr 8 10 10 5 IfAG Turkey
areq 9 10 10 8 JPL Peru
bor1 10 10 10 9 SRC-PAS Poland
brmu 9 9 9 10 NOAA USA
brus 10 10 10 9 ROB Belgium
cas1 8 9 9 7 AUSLIG Antarctica
chat 7 7 7 6 JPL New Zealand
fort 9 10 9 8 NOAA Brazil
guam 9 10 10 8 JPL Guam
hob2 0 0 0 0 AUSLIG Australia
iisc 9 9 8 9 JPL India
irkt 8 9 9 5 DUT Russia
kely 4 2 3 5 NOAA Greenland
kerg 9 10 8 9 CNES Kerguelen Islands
kiru 10 10 9 10 ESA Sweden
kit3 6 7 7 5 GFZ Uzbekistan
kour 8 9 6 10 ESA French Guiana
lpgs 5 5 5 5 GFZ Argentina
mac1 4 4 4 4 AUSLIG Australia
mali 7 8 5 9 ESA Kenya
mas1 4 3 2 7 ESA Spain
mate 7 7 5 8 ASI Italy
mcm4 10 10 10 9 JPL Antarctica
mdo1 9 9 10 7 JPL USA
mdvo 8 8 8 7 DUT Russia
mets 7 6 6 8 FGI Finland
nlib 10 10 10 9 JPL USA
ohig 6 7 7 4 IfAG Antarctica
onsa 8 7 7 9 OSO Sweden
pama 7 8 5 8 CNES Tahiti
pert 9 9 9 10 ESA Australia
pie1 10 10 10 9 JPL USA
pots 8 9 7 10 GFZ Germany
rcm5 9 9 8 10 NOAA USA
sey1 0 0 0 0 JPL Seychelles
shao 9 10 8 8 JPL China
stjo 10 10 10 9 NRCan-GSD Canada
taiw 8 9 7 10 IES-AS Taiwan
thu1 9 9 9 9 JPL Greenland
tskb 10 10 10 9 GSI Japan
usud 10 10 10 9 JPL Japan
vill 10 10 10 10 ESA Spain
zwen 6 6 5 7 GFZ Russia
_____________________________________________________________________
Other IGS Sites (retrieved by JPL)
site overall quantity quality latency agency location
---------------------------------------------------------------------
aoa1 10 10 10 9 JPL USA
auck 8 9 9 7 JPL New Zealand
blyt 10 10 10 9 SIO USA
bogt 9 9 9 9 JPL Columbia
bran 5 6 5 4 USGS-SIO USA
braz 0 0 0 0 IBGE-JPL Brazil
carr 10 10 10 9 JPL USA
casa 9 9 7 9 JPL USA
cat1 10 10 10 9 JPL USA
chil 8 9 9 6 USGS-SIO USA
cit1 10 10 10 9 JPL USA
coso 9 9 9 10 SIO USA
crfp 9 9 9 9 SIO USA
cro1 10 10 10 9 NRAO-JPL US Virgin Islands
dav1 5 4 4 5 AUSLIG Antarctica
drao 10 10 10 9 NRCan-GSC Canada
ebre 2 3 3 1 ICC Spain
eisl 9 10 9 9 JPL Chile
gode 10 10 10 9 NASA-GSFC USA
gope 9 9 9 8 RIG Czech Republic
gras 9 10 10 7 CNES France
graz 8 8 7 9 ISR Austria
harv 10 10 10 9 JPL USA
hers 8 9 7 8 RGO United Kingdom
holc 8 10 10 4 USGS-SIO USA
joze 9 10 10 8 IGGA-WUT Poland
jplm 10 10 10 9 JPL USA
lama 0 0 0 0 OUAT Poland
lbch 10 10 10 9 JPL USA
lhas 0 0 0 0 IfAG China
long 5 6 4 5 USGS-SIO USA
math 7 10 10 0 SIO USA
monp 8 7 8 9 SIO USA
noto 8 10 10 5 ASI Italy
nyal 8 8 7 8 NMA Norway
oat2 10 10 10 9 JPL USA
pin1 8 9 9 8 SIO USA
pol2 7 7 7 7 UNAVCO Kyrgyzstan
pvep 9 10 7 9 SIO USA
quin 10 10 10 9 JPL USA
reyk 6 4 4 9 IfAG Iceland
sio3 10 10 10 9 SIO USA
sni1 0 0 0 0 JPL USA
spk1 10 10 10 9 JPL USA
taej 8 6 7 10 KAO Korea
trak 8 9 7 8 SIO USA
uclp 10 10 10 9 JPL USA
upad 6 7 7 5 UP Italy
usc1 10 10 10 9 JPL USA
vndp 9 9 10 9 SIO-JPL USA
wes2 9 9 10 10 NOAA USA
whc1 9 10 10 9 JPL USA
whi1 9 10 9 9 JPL USA
wlsn 10 10 10 9 JPL USA
wtzr 10 10 10 9 IfAG Germany
zimm 9 9 8 9 FOT Switzerland
_____________________________________________________________________
Other IGS Sites (not retrieved by JPL)
site agency location
---------------------------------------------------------------------
cagl ASI Italy
hflk ISR Austria
medi ASI Italy
roch SIO USA
sfer ROA Spain
_____________________________________________________________________
Other Sites (no log file at IGS CB)
site overall quantity quality latency agency location
---------------------------------------------------------------------
brib. 9 10 9 9 USGS USA
chab. 7 10 9 3 USGS USA
cice. 10 10 10 9 JPL Mexico
clar. 8 10 8 6 USGS USA
cmbb. 0 0 0 0 USGS USA
cmp9. 8 10 10 6 USGS USA
dam1. 7 8 9 3 USGS USA
dam2. 5 4 4 6 USGS USA
denc. 0 0 0 0 CORS USA
fai2. 10 10 10 9 JPL USA
farb. 9 10 10 7 USGS USA
gol2. 10 10 10 9 JPL USA
hbrk. 3 0 0 10 CORS USA
hklo. 3 0 0 10 CORS USA
holp. 8 10 10 6 USGS USA
hopb. 6 4 4 9 USGS USA
krak. 3 0 0 8 JPL USA
leep. 8 10 10 5 USGS USA
lmno. 3 0 0 10 CORS USA
moin. 3 0 0 9 JPL Costa Rica
mola. 8 10 10 4 USGS USA
nune. 8 10 10 4 USGS USA
pltc. 3 0 0 10 CORS USA
rock. 8 10 10 5 USGS USA
sol1. 9 9 9 9 NOAA/NASA USA
strl. 3 0 0 9 CORS USA
tabl. 4 3 3 5 USGS USA
tibb. 6 4 4 9 USGS USA
tid2. 10 10 10 9 JPL Australia
tmgo. 8 7 7 9 CORS USA
usna. 9 9 9 9 NOAA/NASA USA
vcio. 3 0 0 10 CORS USA
wint. 8 10 10 3 USGS USA
wlps. 3 0 0 9 CORS USA
wsmn. 3 0 0 10 CORS USA
_____________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Table 2 Engineering data for precise-point-positioned sites
-------------------------------------------------------------------------------
date
| site
| | number of time tags for which clock solution is valid
| | | rms deviation from straight line of clock solution (ns)
| | | | drift of clock solution (parts per trillion)
| | | | | clock solution at noon (usec)
| | | | | | # of pseudorange meas.
| | | | | | | rms (cm)
| | | | | | | | # of phase meas.
| | | | | | | | | rms (mm)
| | | | | | | | | | orig
| | | | | | | | | | | tot
| | | | | | | | | | <-breaks->
|________ |___ |_ |_______ |_______ |_______ |___ |_ |___ |_ |_ |_
...
1996-02-25 IISC 288 69.9 0.247 -0.00443 1677 70 1675 13 69 69
1996-02-25 IRKT 287 147 9.47 -0.214 1650 46 1650 8 51 51
1996-02-25 JOZE 286 36.2 -94.8 181 1653 50 1653 7 39 39
1996-02-25 JPLM 288 41.7 114 1.4e+03 1667 26 1667 6 44 47
1996-02-25 KERG 288 70.9 7.06 -660 0 . 1552 5 53 53
1996-02-25 KIRU 288 3.08 -0.00867 11.7 1427 50 1427 10 67 80
1996-02-25 KIT3 288 126 0.0974 -0.0181 1642 66 1642 11 47 47
1996-02-25 KOKB 288 0.131 0.366 0.00596 1661 55 1661 6 45 50
1996-02-25 KOSG 288 1.02 -3.94 20.5 1324 38 1324 5 44 44
...
_______________________________________________________________________________
96/04/05 /users/igscb/work/data/network/SCCS/s.igsnet.doc
[Mailed From: jfz at cobra.jpl.nasa.gov]
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