2-PAD: An Introduction. The 2-PAD Team
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1 2-PAD: An Introduction The 2-PAD Team Workshop, Jodrell Bank, 10 Presented th November 2009 by 2-PAD: Dr An Georgina Introduction Harris Georgina Harris for the 2-PAD Team 1
2 2-PAD Objectives Demonstrate digital beamforming using direct RF conversion Multiple simultaneous beams, bandwidth v beams trade Low self induced RFI Low cost interconnects are feasible Dual polarisation measurements Proof of calibration at tile level To produce a flexible platform upon which to test a variety of subsystems for the Aperture Array for the SKA Currently 300MHz to 1GHz Georgina Harris for the 2-PAD Team 2
3 2-PAD Simplified System Overview LNA Analogue Signal Transport Digitiser Subsystem Digital Signal Transport Digital Beamforming Processor Various BECA ORA FlowPAD Various To suit Antenna Options Gain Chain CAT7 Cable Sig Cond Card Midplane DAQ Card Clock Distribution CX4 10Gb/s 4x3.125Gb/s 8b10 Encoding Streaming Channel No Transport Overhead Berkeley FPGA Board Based System Or IBM 20 Node C64 Cyclops Based System DELL Quad Core ZEON Server 2TB Storage RHEL Georgina Harris for the 2-PAD Team 3
4 2-PAD: The Antennas 16 x 16 dual polarisation elements RF Testing 8 x 8 dual pol 2-PAD V1 4 x 4 dual pol 2-PAD V2-8 x 8 dual pol Antennae at the edges are dummy loaded Georgina Harris for the 2-PAD Team 4
5 BECA Antennas Georgina Harris for the 2-PAD Team 5
6 Log Mag (db) 10 The Co-Polar pattern change 1.5dB between 45 o E and BS scan BECA 8x8 1GHz BS BECA 8x8 1GHz 45 o Angle (db) Georgina Harris for the 2-PAD Team 6
7 ORA Antennas Georgina Harris for the 2-PAD Team 7
8 FLOTT Antennas Georgina Harris for the 2-PAD Team 8
9 Analogue Electronics Georgina Harris for the 2-PAD Team 9
10 The Bunker at JBO Georgina Harris for the 2-PAD Team 10
11 2-PAD Site at Jodrell Bank Georgina Harris for the 2-PAD Team 11
12 Antenna Calibration Mount Georgina Harris for the 2-PAD Team 12
13 Antenna Positioning for Calibration and Testing Georgina Harris for the 2-PAD Team 13
14 2-PAD Test Range Georgina Harris for the 2-PAD Team 14
15 Georgina Harris for the 2-PAD Team 15
16 Georgina Harris for the 2-PAD Team 16
17 Boards Signal Conditioning Card DAQ Card Midplane Clock Distribution Georgina Harris for the 2-PAD Team 17
18 Signal Conditioning Module Front Panel Connector Single Ended DC Power & Equal. Power Reg Filter TV By-pass Filter Lo Filter Hi Step attenuator Driver Diff. Pair Control Single Ended Power Reg DC Power & Equal. Filter TV By-pass Filter Lo Filter Hi Step attenuator Driver Diff. Pair Georgina Harris for the 2-PAD Team 18
19 Signal Conditioning Module Georgina Harris for the 2-PAD Team 19
20 DAQ Card Georgina Harris for the 2-PAD Team 20
21 DAQ Card Georgina Harris for the 2-PAD Team 21
22 DAQ board and results Georgina Harris for the 2-PAD Team 22
23 Midplane Clock Module Clock Module Signals from field 2-channel signal conditioning module 2-channel acquisition and processing module 2 x 10Gb CX4 Copper Midplane Power & Clock Distribution via midplane Instrument Management Network via midplane Georgina Harris for the 2-PAD Team 23
24 Midplane Clock Module Clock Module 2-channel signal conditioning module 2-channel acquisition and processing module Georgina Harris for the 2-PAD Team 24
25 Clock System Georgina Harris for the 2-PAD Team 25
26 System Clock Card Georgina Harris for the 2-PAD Team 26
27 Shelf Clock Card Layout Georgina Harris for the 2-PAD Team 27
28 2PAD 8x8x2 Analogue System The 2PAD System in 8x8 Dual Polarisation Configuration requires 32 sets of the components shown below; Antenna array Quiet zone Digital RFI zone Balun Balun Balun LNA LNA LNA RFI Filter & Gain RFI Filter & Gain Semi-rigid Coaxial # 1 RFI Filter & Gain Gain Chain Module CAT-7 Splitter Module Coaxial #2 Signal Conditioning Data Acquisition CX4 10Gb links Balun LNA RFI Filter & Gain Signal Conditioning Data Acquisition Analogue Digital Georgina Harris for the 2-PAD Team 28
29 Analogue System 32-channel system showing cabin mounted rack undergoing tests at Oxford Georgina Harris for the 2-PAD Team 29
30 2-PAD Simplified System Overview LNA & Analogue Signal Transport Multi Channel ADC (Casper Hardware) Multi Channel ADC (Custom) Digital Beamformer (Casper Hardware) Digital Beamformer (Software) Back-End Processing Georgina Harris for the 2-PAD Team 30
31 IBob Beamformer Tests in the Anechoic Chamber The 4x1 ibob-based Beamformer was initially tested in the anechoic chamber and irradiated with a 700MHz signal The 4x4x2 beamformer should be installed and tested on 2-PAD by the end of the year. Georgina Harris for the 2-PAD Team 31
32 2-PAD Simplified System Overview LNA & Analogue Signal Transport Multi Channel ADC (Casper Hardware) Multi Channel ADC (Custom) Digital Beamformer (Casper Hardware) Digital Beamformer (Software) Back-End Processing Georgina Harris for the 2-PAD Team 32
33 IBM Cyclops-Based Software Beamformer Completed with the following design characteristics: 2 Polarisations; 1,2,4 or 8 beams; 1X8 bits input data size and 2X8 bits output data size; Mixed arithmetic precision: Coefficients are applied in double floating-point precision and partial-beams accumulated in 8 bits integer format. Compile-Time updatable beamforming coefficients; Independent of array geometry and antenna choice; Georgina Harris for the 2-PAD Team 33
34 2-PAD Current Status Digital First Light - a true end to end test including both digital and analogue systems at the 2-PAD site occurred on Tuesday 30 th June 2009 A 4x4x1 IBOB based FPGA digital beamformer system is now being tested on 2-PAD. A higher bandwidth digital solution based on a custom data acquisition and channelization card (DAQ) is installed on 2- PAD This allows data to be captured for non-real time beamforming using the remote IBM software beamformer It will permit integration to an FPGA-based backend for future real-time beamforming Georgina Harris for the 2-PAD Team 34
35 Georgina Harris for the 2-PAD Team 35
36 Georgina Harris for the 2-PAD Team 36
37 Georgina Harris for the 2-PAD Team 37
38 Any Questions? Please contact who will put you in touch with the correct members of the team
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