Transcript casper2010_wuppi_shilpa_bollineni

DATA ACQUISITION ON THE 43M TELESCOPE
Shilpa Bollineni, Glen Langston, John Ford, Randy McCullough and
Paul Demorest
DATA ACQUISITION ON THE 43M
TELESCOPE
• The Digital Acquisition System is a clone of GUPPI(Green
Bank Ultimate Pulsar Processing Instrument).
• It was developed to be placed on the 43m telescope in the
feed-box.
• Why we did this?
1) The limitation with the fiber modem on the frequency range
which will be eliminated and we can observe at higher range.
2) We will have more dynamic range in the system as the S/N
will be better.
3) As the prime-focus box is controlled we will have a more
stable environment.
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DC
+/-15V
AC
AC
RFI Shielded Box
BEE2
IBOB 1
WUPPI
IBOB 2
Dewar
IP Power Strip
SWITCH
Bias # 17
Bias Cards
(2)
Vacuum Sensor #1
Teledyne VT6
Vacuum
Gauge
Heater
Heater
Control
Circuit
#2
Temp Sensor # 6
Induction
Motor Blower
H O S
CAT5
Fiber to
cat5
Gate Voltage Monitor (9)
Vacuum Pressure Monitor (1)
Remote
Monitoring
Net Burner
OFF
ON
#4
Lakeshore
Model 218
Temp Monitor
Temperature Monitor (2)
#2
Controller
E
DC Supply
(48V,10A)
Sunpower GT
CryoCooler
Cryocooler
Power supply
RF INPUT
Fig 1: Block diagram of the system
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Overview of the components
1) WUPPI
a) IBOB’s (Sampling)
1) 8-bit sampling.
2) Bandwidth of 800MHZ.
b) BEE2 (Data Processing)
1) We have 4k channel FFT.
2) full polarization
c) IP power strip (Remotely control the power of
the hardware)
d) Dual Synthesizer (800 MHz clock)
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Overview of the components
e) Ethernet switch
f) 1PPS converter (Fiber to copper converter)
g) Ethernet converter (Fiber to Cat5)
2) Remote Monitoring:
a) Net Burner (Embedded networking device)
b) Temperature Monitoring Device (Lakeshore)
3) Refrigerator components:
a) Controller (for the refrigerator on the Dewar)
b) DC power supply (To the refrigerator)
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The RFI shielded box has the dimensions
21(w)x24(d)x22(h) inches
FRONT VIEW
Fig 2: Mechanical model of the RFI shielded box
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Fiber cable data O/P
Brackets for
mounting
SMA
Fig 3: Front-view of the box
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• Front View
Fiber to copper
converter for
1PPS
• Back View
XAUI cables
ST connectors
(Fiber)
4 channel transceiver
IP Boot Bar
Fig 4: Inside the box
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Fig 5: Transceiver module/Fiber Fan-out
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Front-end receiver
Back-end Data Processing
3/28/2017
Fig 6: Mechanical View of the Front-End Box
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Different phases of testing
a) RFI test passed.
1) Frequency range: 20 MHz to 6.5 GHz no
emissions.
b) Data was taken in the lab (plots follow).
b) Next the box will be placed in the 43m
control room.
c) Finally it will be placed in the Front-end
box so we can process the data at the
antenna.
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Results
Fig 7: Spectrum @ 800MHz
Fig 8: Spectrum @ 220MHz
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Fig 9: Pulsar 0329+54
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Summary and Future work
• WUPPI was developed and successfully
tested in the lab.
• After integration with the front-end it will be
placed on the telescope.
• Working on replacing Roach with the
IBOB’s and BEE2 in the WUPPI.
• Worked with the Parkes spectrometer design.
1) Built a 2K channel, 800MHz dual
polarization version.
2) Introduced the 1SFA concept from GUPPI
into the design.
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Fig 10: Spectrum on Roach
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Fig 11: test signal @ 611 MHz
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Acknowledgement
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Glen Langston
John Ford
Jeff Cromer
Randy Mccullough
Jason Ray
Dennis Egan
Gary Anderson
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