results from the yebes raege telescope · pdf filevia alma common software. 4th international...
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Results from the Yebes RAEGE telescope
P. de Vicente
Observatorio de Yebes - CDT (IGN)
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44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
The telescope
Designed by Mt-Mechatronics
Mechanics built by Asturfeito
Telescope finished by end of 2013
Diameter: 13.2 m
Max. Az. speed: 12 degs /sMax. El. speed: 6 degs /s
Subreflector shape: ring focus
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44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
The telescope
Container: Servos + ACU
Az cabin: encoders + HCU
El cabin: Receivers + com.
Tower basement
Cable grnd. unit
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44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
The Antenna Control Unit
Main axes ACU Hexapod CU
Runs Windows with real time kernel: TwinCAT from Beckhof
Requires IRIG-B signal to keep UTC
Local Control Panel & Handheld panel (emergency cases)
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44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
Remote Control System
CORBAvia Alma Common Software
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44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
The Field System connection
SocketTCP Client
Component
TCP Server
fsNet
fsNet
Reads shared memory (local + FS)
Copies part of the shared memory to an internal structure
Sends the structure
Receives the structure
Copies the internal structure to shared memory (local + FS)
Opens 1 (or 2) socket (s)
Loo
p
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44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
The Field System connection
Local shared memory structure
(new source, new LOa, )
variablesSocket structure
semaphores
Az, El, Opacity
FS shared memory structure variables
Ra, Dec, tempwx, windwx, humidwx, ...
semaphores
variables (local)
variables (FS)
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44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
The Field System connection
TCP client exchanges a structure with
source positionLO frequencies
weather statusantenna position
calibration mode
Variables SemaphoresNew sourceNew LOCal. op. required
StowFS RT
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44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
The Field System connection
FS Command Activated semaphore
Semaphore deactivated
1
2
activate semaphore
FS log
Local Shared Memory Socket structure
Action at the telescope
Deactivate semaphore&
&Collect telescope data
Telescope data
Fills the structure
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Exporting the code
Used at:
Ishioka (for the commissioning phase - Toyo)
Ny Alesund
Will be used at:
Other antennas by MT-Mechatronics ?
Connection to Field System easily adapted to a twin telescope
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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Local connection and data transport
Data is transferred via optical fiber to the 40m backends room
Current SD backends: Continuum detectors
Possibility to connect an FFTS
Data / Control
IF (2.5 GHz) + 5 MHz, IRIG-B, 80 Hz
13.2 m
40 m
Monomode fiber
Multimode fiber
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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VLBI equipment
1 x DBBC2 (4 IFs)
2 x 500 MHz (2 VSI VDIF)
Currently Soon ..
2 x DBBC2 with Fila10G
2 x 4 x 1 GHz (VDIF)
1 x Mark5B+
Max: 2 Gbps ( 1 x 512 MHz)
1 (or 2) x Mark6
Max: 16 Gbps
Phase cal (5 MHz pulses)
Cable measurement
Phase cal (5 MHz pulses)
Cable measurement
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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Cable length variations - temperature dependence
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
5 MH dist.
OF converter
OF converter
Cable GroundUnit
Cable AntennaUnit
13m tower
40m backends room
13m elevation cabin
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Cable length variations - temperature dependence
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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Cable length variations - temperature dependence
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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RFI, a problem at low frequencies
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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RFI, a problem at low frequencies
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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RFI, a problem at low frequencies
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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The three band receiver
S band
X Band
Ka band
2.2 – 2.7
7.0 – 9.5
28.0 – 33.0
500
950
500
RCP/LCP
RCP/LCP
RCP/LCP
1.7
Freq. Range GHz BW (MHz) Pol LO (GHz)
0.1-20 / 20 mHz
0.1-20 / 20 mHz
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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Main characteristics of the antenna
S band
X Band
Ka band
~70 %
~75 %
~60 %
1700
1300
4000
50
40
100
Efficiency SEFD (Jy) Tsys (K)
~2550
~675
~190
HPBW('')
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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Main characteristics of the antenna
S band
X Band
Ka band
~70 %
~75 %
~60 %
1700
1300
4000
50
40
100
Efficiency SEFD (Jy) Tsys (K)
~2550
~675
~190
HPBW('')
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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Main characteristics of the antenna
3C84 X band Venus Ka band
RCP
LCP
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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In the IVS network
Since April 14, 2015: once per week R1 + R4 sessions
Experiments:
R4663 (first fringes, only X band)
R1675, R1677, R1678, R1679, R1680 (S + X bands)
R1675 produced first coordinates (Leonid Petrov):
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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Ka band (32 GHz) fringes between Wettzell & Yebes
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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X band fringes between Zc (512 MHz) & Yj (PFB 256 MHz)
44thth International VLBI Workhsop International VLBI Workhsop Nov. 2015Nov. 2015
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2222ndnd European VLBI General Assembly European VLBI General Assembly May 2015May 2015
Thank You !!