the current status of k5 evlbi intensive session takashima, kazuhiro; machida,morito; fujisaku,...

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

TOPICTOPIC

1. What is intensive session ?

2. System components1. K5 recording system

2. K5 correlator system

3. eVLBI data transfer

4. Contribution to “Deep Impact Mission”

5. Results of Intensive session

IVS intensive sessionIVS intensive sessionMonitoring the Rotation of the Earth Monitoring the Rotation of the Earth

(UT1)(UT1)

Leap second(2006.1.1)



・ 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.

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

Number of INT session

0

50

100

150

200

250

300

350

2003 2004 2005 2006

Year

Num

ber INT2(K5)

INT2(K4)INT1

Number of INT sessionNumber of INT session

K5K4

Mark*

System component (recording)System component (recording)Reference signal distributor

16ch video amps

K5PC

K5PC

Disk alley(SATA disk)

Mark5Wettzell K5

Tsukuba

IVS-INT2

hard disk

Dataserver

Dataserver

Dataserver

Dataserver

correlator

correlator

correlator

correlator

correlator

correlator

correlator

Current form of K5/VSSP at correlator sideCurrent 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

System component K5 correlatorSystem component K5 correlator

Optical network

K5 PC cluster correlator

Data transfer

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

gemnetgemnet

GEANT2

GEANT2 Super-SINET

Super-SINET

X-WINX-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

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

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

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)

num

ber

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

num

ber

k4(2005)k5(2005)Mark4- 5(2005)

2006 (Jan.-Aug.) 2005

Average days K4 K5 Mark4/5

2006 - 2.1 3.8

2005 5.8 3.0 5.0

0.0

1.0

2.0

3.0

4.0

Apr Jun Sep Nov Feb May Jul Oct Jan Mar Jun Aug

Date

Pro

cess

ing

Fac

tor

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

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

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


day

UT1

-UTC

(sec

)

UT1 during the MissionUT1 during the Mission

Prediction

UT1 from VLBI observ.(not yet)

4-July 　 Mission Date

2.2msec

Equivalent to orbit error 21km

INT1&2

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)

9- J une

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)


INT2 (eVLBI)

INT1

Result from VLBI(released)

4-July

1.1msec


INT1&2

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)

16- J une

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)


4-July

0.6msec


INT2 (eVLBI)

INT1

INT1&2

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)

23- J une

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)


4-July

0.6msec


INT2 (eVLBI)

INT1

INT1&2

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)

30- J une

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)


4-July

0.4msec


INT2 (eVLBI)

INT1

INT1&2

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)

30- J une

- 0.620

- 0.615

- 0.610

- 0.605


day

UT1

-UTC

(sec

)


IMPACT 5:52 UT

4-July

Success!

INT2 (eVLBI)

INT1

©NASA JPL

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 2006

Year

UT1-

UTC

(se

c)

Mark4/ 5K4/ 5

Intensive session result (1)Intensive session result (1)

Leap second

(UT1- UTC)- C04

- 150

- 100

- 50

0

50

100

150

2001.5 2002.5 2003.5 2004.5 2005.5 2006.5

date (year)

(UT1

-UTC

)-C

04 (m

icro

sec)

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

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

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- 05

Day

(UT1

-UTC

) - C

04 [

sec]

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

Thank you

the current status of k5 evlbi intensive session takashima, kazuhiro; machida,morito; fujisaku,...

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