the current status of k5 evlbi intensive session - mit …€¦ · ppt file · web view ·...
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The current status of The current status of K5 eVLBI intensive session K5 eVLBI intensive session
Takashima, Kazuhiro; Machida,Morito; Fujisaku, Junichi;
Kokado, Kensuke; Shigematsu, Hiromi Geographical survey institute, JAPAN
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TOPICTOPIC
1. What is intensive session ?2. System components
1. K5 recording system2. K5 correlator system
3. eVLBI data transfer4. Contribution to “Deep Impact Mission”5. Results of Intensive session
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IVS intensive sessionIVS intensive sessionMonitoring the Rotation of the Earth Monitoring the Rotation of the Earth
(UT1)(UT1)
Leap second(2006.1.1)
Leap second(1999.1.1)
Leap second(1997.7.1)
・ The Earth rotation speed is not constant, disturbed by various dynamic phenomena.・ VLBI is one of few techniques that can monitor the earth’s rotation.
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IVS-INT1 and IVS-INT2IVS-INT1 and IVS-INT2 The 1 hour-long 1-baseline intensive sessions for UT
1 measurement daily. Monday through Friday Mark 5 is used on the Kokee-
Wettzell baseline, and on Saturday and Sunday Mark5/K5 is used on the Wettzell-Tsukuba baseline.
Session Days Baseline Correlator
INT1 Mon-Fri Wz-Kk WACO Mark5
INT2 Sat-Sun Wz-Ts GSI K5 eVLBI
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Number of INT session
0
50
100
150
200
250
300
350
2003 2004 2005 2006Year
Numb
er INT2(K5)INT2(K4)INT1
Number of INT sessionNumber of INT session
K5K4
Mark*
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System component (recording)System component (recording)Reference signal distributor
16ch video amps
K5PC
K5PC
Disk alley(SATA disk)
Mark5Wettzell K5
Tsukuba
IVS-INT2
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hard disk
Dataserver
Dataserver
Dataserver
Dataserver
correlator
correlator
correlator
correlator
correlator
correlator
correlator
Current form of K5/VSSP at correlator side
Management computer
correlator
Correlation servers(with 3GHz Intel Xeon dual CPUs)data servers
System component System component K5 correlatorK5 correlator
Gb-E
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System component K5 correlatorSystem component K5 correlator
Optical network
K5 PC cluster correlator
Data transfer
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Data transferData transfer
• GSI Correlator downloads Mark5 data from Wz.• convert the format from Mark5 to K5 simultaneously.
•automatic procedures
50Gbyte
ncftpAuto-script friendlyresume available
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gemnet
GEANT2
Super-SINET
X-WIN
Regensburg
TsukubaWettzell
traceroute to Wettzell Station (141.74. ), 30 hops max, 38 byte packets 1 .tsukuba.gemnet.net (210.229. ) 0.319 ms 2 .mecl.gemnet.net (210.229. ) 12.193 ms 3 nii-IX1-P3-0.sinet.ad.jp (150.99.199.5) 10.800 ms 4 NYC-gate1-P3-0.sinet.ad.jp (150.99.198.246) 186.511 ms 5 sinet.ny1.ny.geant.net (62.40.103.233) 182.895 ms 6 so-7-0-0.rt1.ams.nl.geant2.net (62.40.112.133) 262.334 ms 7 so-6-2-0.rt1.fra.de.geant2.net (62.40.112.57) 273.962 ms 8 dfn-gw.rt1.fra.de.geant2.net (62.40.124.34) 274.857 ms 9 cr-leipzig1-po4-0.x-win.dfn.de (188.1.18.190) 288.028 ms 10 cr-erlangen1-po2-3.x-win.dfn.de (188.1.18.18) 284.133 ms11 ar-regensburg1-po0-0.x-win.dfn.de (188.1.72.38) 287.110 ms12 ar-regensburg2-ge0-0-0.x-win.dfn.de (188.1.73.2) 286.465 ms13 141.74. (141.74. ) 288.462 ms
e-VLBI networke-VLBI networkK5 intensive sessionK5 intensive session
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Time Schedule (INT2)Time Schedule (INT2)
Sat
Sun
Mon
0 12 24JST: UTC+9h
FTP
FTPconvert
FTP
FTPconvert
Correlationetc
Obs.
Obs.
Submit to IVS
Turnaround period (Best case)Sat. session : 2 daysSun. session: 1 day
Mark5to PC
Mark5to PC
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Turnaround period (INT1&2)Turnaround period (INT1&2)The days from obs to data release (2006)
0
10
20
30
40
50
60
1 2 3 4 5 6 7 8 9 10~the period to release (days)
numb
er
K5(2006)Mark5(2006)
0
10
20
30
40
50
60
70
80
1 2 3 4 5 6 7 8 9 10~(days) period to release
numb
er
k4(2005)k5(2005)Mark4- 5(2005)
2006 (Jan.-Aug.) 2005
Average days K4 K5 Mark4/52006 - 2.1 3.82005 5.8 3.0 5.0
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0.0
1.0
2.0
3.0
4.0
Apr Jun Sep Nov Feb May Jul Oct Jan Mar Jun Aug
Date
Proc
essi
ng F
acto
r
tape based (K4)
eVLBI(K5)
processing factor (PF) =total length of correlationtotal length of a session
efficiency comparison with PF from intensive session
200620052004
Better
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Contribution to Deep Impact missionContribution to Deep Impact mission
( C ) NASA JPL
・ UT1 value provided by INT session•eVLBI observations for IVS-INT2・ Data transfer for short time•Contribution to the success of the mission
http://deepimpact.jpl.nasa.gov/Traveling at a relative velocity of 10 km/s and from about 864,000 km (536,865 miles) away, the impactor must strike the 6 km (3.7 mile) diameter comet.
( C ) NASA JPL
4 July 2005
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INT1&2
- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
2- J une- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
UT1 during the MissionUT1 during the Mission
Prediction
UT1 from VLBI observ.(not yet)
4-July Mission Date
2.2msecEquivalent to orbit error 21km
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INT1&2
- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
9- J une- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
UT1 during the MissionUT1 during the Mission
INT2 (eVLBI)INT1
Result from VLBI(released)
4-July
1.1msecEquivalent to orbit error 10km
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INT1&2
- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
16- J une- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
UT1 during the MissionUT1 during the Mission
4-July
0.6msecEquivalent to orbit error 6km
INT2 (eVLBI)INT1
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INT1&2
- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
23- J une- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
UT1 during the MissionUT1 during the Mission
4-July
0.6msecEquivalent to orbit error 6km
INT2 (eVLBI)INT1
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INT1&2
- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
30- J une- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
UT1 during the MissionUT1 during the Mission
4-July
0.4msecEquivalent to orbit error 4km
INT2 (eVLBI)INT1
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INT1&2
- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
30- J une- 0.620
- 0.615
- 0.610
- 0.605
- 0.6001- J un 11- J un 21- J un 1- J ul 11- J ul 21- J ul 31- J ul
day
UT1-
UTC(
sec)
UT1 during the MissionUT1 during the Mission
IMPACT 5:52 UT
4-July
Success!INT2 (eVLBI)INT1
©NASA JPL
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Mon-Fri
Sat-Sun
- 0.8
- 0.6
- 0.4
- 0.2
0
0.2
0.4
0.6
0.8
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006Year
UT1-
UTC
(sec)
Mark4/ 5K4/ 5
Intensive session result (1)Intensive session result (1)
Leap second
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(UT1- UTC)- C04
- 150
- 100
- 50
0
50
100
150
2001.5 2002.5 2003.5 2004.5 2005.5 2006.5date (year)
(UT1
-UTC
)-C0
4 (m
icros
ec)
Kokee- WettzelTsukuba- Wettzellinear (Tsukuba- Wettzel)linear(Kokee- Wettzel)
Intensive session result (2)Intensive session result (2)
INT1
INT2
C04: the daily UT1-UTC by IERS
CONT05
GSI
WACO
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CONT05 sessionCONT05 session・ 11 VLBI stations participated in CONT05 sessions・ The 15 days of continuous VLBI observation (September 12, 2005 ~ September 27,2005)・ The goal is analysis of the high frequency(sub-daily) earth orientation parameter.
Observation network
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INT1&2 with CONT05INT1&2 with CONT05( UT1- UTC )- IERS C04
- 80.0E- 6- 60.0E- 6- 40.0E- 6- 20.0E- 6000.0E+020.0E- 640.0E- 660.0E- 680.0E- 6
100.0E- 6120.0E- 6
12- Sep- 05 15- Sep- 05 18- Sep- 05 21- Sep- 05 24- Sep- 05 27- Sep- 05Day
(UT1
-UTC
) - C
04 [s
ec]
CONT05Ts- Wz(1h)Kk- Wz(1h)linear (CONT05)
INT1(Kk-Wz) 18:30-19:30 UTINT2(Ts-Wz) 7:30- 8:30 UT 11 hours diff.
Sub-daily variation
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Thank you