Download - DS-6 BEST System overview
S. Montebugnoli2nd SKADS Workshop 10-11 October 2007
Stelio MontebugnoliIRA - INAF- Italy
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
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-)
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
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
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)
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
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
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
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)
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
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”
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”
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
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
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
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
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
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
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
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