Download - DS-6 BEST System overview
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Stelio MontebugnoliIRA - INAF- Italy
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Main points…Main points…
• DS6-T1: Design of subsystems • DS6-T2: Development and demonstration
• DS6-T3: Assesment of performance
• DS6-T4: Phased array on concentrators
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
DS-6 ScenarioDS-6 Scenario
DS-6 is aimed to the construction of 3 demonstrators, different in size, based on a large existing platform equipped with cylindrical concentrators (Northern Cross array located in Medicina, near Bologna -Italy-)
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Deliverables:Deliverables:1- LNAs, Analog Optical link, IF stages2- Wideband A/D converter, at least 1 GS/sec @ 8bit3- Ultra fast data processing4- Reliability prediction
Achieved milestones Achieved milestones and deliverablesand deliverables DS6-T1 DS6-T1
IF Input (Optical link)
Intermediate Freq Block
Data Proc Cluster
Reliability Prediction
High performance Front–End
High performance Front end
Low cost Optical Link Analogue Optical link
S.Montebugnoli
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables DS6-T2deliverables DS6-T2
• DS-6 T2: Development and demonstration of the
BEST-1 a small platform as part of the NC (408 MHz)
BEST-1176 m2
4 rx – 1 N/S cylinder
1 Rx=¼ of NS cylinder
4 RX =1 NS cylinder
Aug. 2005
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables DS6-T2deliverables DS6-T2
• DS-6 T2: Development and demonstration of the
BEST-2 a large SKA platform as part of the NC (408 MHz)
BEST-21410 m2
32 rx – 8 N/S cylinders
(Equivalent to a 42 mt(Equivalent to a 42 mtdish antenna)dish antenna)
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables DS6-T2deliverables DS6-T2
• DS-6 T2: Development and demonstration of the BEST-2, a large SKA platform as part of the NC (408 MHz)
NF=0.45dB Tn=32K Gain=60dB BW=16MHz@408MHz OIP3>+33dBm
Input RL>15dB Output RL>10dB Power Supply=10-15Volt@=245mA
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables DS6-T2deliverables DS6-T2
• DS-6 T2: Development and demonstration of the BEST-2, a large SKA platform as part of the NC (408 MHz)
=1310nm NF=36dBdB Gain=-25dB BW=(0.1-1)GHz IIP3>+33dBm
Input RL>15dB Output RL>20dB Power Supply=(12-15)Volt@=75mA
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables DS6-T2deliverables DS6-T2
• DS-6 T2: Development and demonstration of the BEST-2, a large SKA platform as part of the NC (408 MHz)
Opticalfibre fromthe front-end
IFuP
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
• DS-6 T2: Development and demonstration of the BEST-2, a large SKA platform as part of the NC (408 MHz)
Achieved milestones and Achieved milestones and deliverables DS6-T2deliverables DS6-T2
4 x A/D @ 8 bit(1.0 GS/sec)
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables DS6-T2deliverables DS6-T2
• DS-6 T2: Development and demonstration of the BEST-2, a large SKA platform as part of the NC (408 MHz).
• The final IF and data processing system for the BEST-2 demonstrator
NC telescopeprotected band3 MHz@408 MHz
BEST-2 BandwidthBEST-2 Bandwidth
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Time
Receivers
Am
pli
tud
e
Transit of Cassiopeia Oct. 2007Transit of Cassiopeia Oct. 2007 (Bw=16 MHz, waterfall plot)(Bw=16 MHz, waterfall plot)
BEST-2 “FIRST LIGHT”BEST-2 “FIRST LIGHT”
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Time
Rec
eive
rs
Transit of Cassiopeia Oct. 2007Transit of Cassiopeia Oct. 2007 (Bw=16 MHz, 2D plot)(Bw=16 MHz, 2D plot)
BEST-2 “FIRST LIGHT”BEST-2 “FIRST LIGHT”
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
DS6-T2 : future stepDS6-T2 : future step
BEST-37464 m2 (2008) (Equivalent to a 100 m(Equivalent to a 100 mdish antenna)dish antenna)
564 mt
640 mt
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables DS6-T3deliverables DS6-T3
DS6-T3: Assessment of Performace
BEST-1: Pn obtained with . GRASP
0,0,2
0 0 0
0,0,2
; , ; , sin
; , ,; , sin
n b
ant
n
P T d d
TP d d
Tsys computed:
= 86.3 K
1 0.045 2100 94.5sys BEST eqT G Flux K Jy Jy K
261
110 0.045
2g
BEST
A K KG
k Jy Jy
Tsys measured:
F=408 MHz
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Potential of FPAs for Potential of FPAs for cylinders DS-6 T4cylinders DS-6 T4
• DS4-T4:Phased array on concentrators
• This is a T0+32 task but some preliminary mechanical
considerations could simplify in a near future the installation of a 4x4 antennas (i.e. a subset of EMBRACE) on the focal line of one cilyndrical concentrator ...useful to test on the
field the deliverables from:• DS-4 T1 • DS-4 T3 • DS-4 T4• DS-4 T6
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Next milestone, next deliverable
• T1 -MilestoneMilestone: - End of design BEST-3 (T0+28 m)
-Deliverables:Deliverables: - Analogue opt. links
- calibration of large array
• T2 --MilestoneMilestone: - End of construction of BEST-3 (T0+40 m)
-Deliverables-Deliverables: - L.O. & Sync distrib. Scheme
- Wide Band high res. A/D - Softw. Beamform. Algorithms
- Adapt. Beamf./RFI mit. Algorithms
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
ConclusionConclusion
• At this date, the DS-6 milestones are reached and At this date, the DS-6 milestones are reached and deliverables ready.deliverables ready.
• The BEST-2 seen the “first light”. Calibration, adaptive The BEST-2 seen the “first light”. Calibration, adaptive beamforming and mapping of a radio source are beamforming and mapping of a radio source are expected to be ready in a couple of monthsexpected to be ready in a couple of months
• The plan is to have BEST-3 (maturity of the technology, The plan is to have BEST-3 (maturity of the technology, costs & first astronomical observation) for Tcosts & first astronomical observation) for T00 +40 m +40 m
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables DS6-T2deliverables DS6-T2
Simulation for BEST-1- N.sensors =4- Sensor= 16 /2 dipoles - Sensor spacing=8- Samples used for R =200- Primary beam = 2o - DOA RFI = +12DOA RFI = +12oo, -23, -23oo, +30, +30oo
SimulationDOA RFIDOA RFI
RFI mitigat.->MVDR(BEST-1)
(Connection with DS-4 T3)
Simulations for BEST-2 are in progress
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables T2deliverables T2
RFIs mitigat.->MSC (BEST-1)(Connection with DS-4 T3)
Prelim
inary
te
st
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S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Achieved milestones and Achieved milestones and deliverables T2deliverables T2
• RFIs Mitigation via Polyphase filter bank (BEST-1) (Connection
with DS-4 T3)
PFB
P, Proc.
Chan.
Contr.
Channel Threshold
level
S.Montebugnoli
Preliminary test