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www.haystack.mit.edu 1 11/10/2014 3rd International VLBI Technology Workshop
Report on the new VGOS 12m radio telecope at Kokee Park Geophysical Observatory
Chris Beaudoin, Alan Whitney, Arthur Niell, Brian Corey, Chet Ruszczyk, Chris Eckert, Mark Derome, Russ McWhirter, Jason SooHoo, Mike Titus, Alan Rogers, Peter Bolis, Roger Cappallo, Jon Byford - MIT Haystack Observatory Chopo Ma, Larry Hilliard, Tom Clark – NASA GSFC Ed Himwich – GSFC/NVI Bill Petrachenko – Natural Resources Canada Javier Gonzalez Garcia – Yebes Astronomical Observatory
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Overview
Frontend – Block Diagram – RF Design – Antenna/Mechanical Design
Backend – Block Diagram – Equipment Rack Layout – VGOS UDC w/ baseband output – RDBE-G v3.0
Signal Chain Calibration Subsystem Monitor/Control VLBI Data AcQuisition (VDAQ) Module Schedule
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Frontend – Block Diagram
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Frontend – RF Design
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Frontend – Antenna
• Main reflector surface comprises 100 precision
adjustable stretch formed aluminum panels,
• Carbon fiber composite sub-reflector with optional
high accuracy hexapod adjustment mechanism
• Precision zero backlash torque biased mechanisms
based on COTS motors and controllers
• Extensively galvanized and painted to assist with
corrosion protection, galvanic protection built in by
design
• Meets all the VLBI2010 specifications
• Suitable for array applications
• Passed CDR in July 2014
High accuracy, high slew speed, full motion 12m Antenna System
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Frontend – Mechanical Design
Fiber Tx High/Low Band
Electronics
Turbo Pump
E/mech Vac Valve
Vac Gauge
Cal Generator
Mon/Con VDAQ Module
Payload Interface LNA Bias Supplies
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Backend – Block Diagram
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Backend – Equipment Rack Layout
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Backend – VGOS UDC
• Supports 2-14 GHz input RF Frequency • Provides 2 GHz baseband output • Net LO tuning resolution < 1 Hz
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Backend - RDBE-G v3.0 Firmware
Pulse Calibration Extraction
Raw Capture Histogram
Raw Capture Spectrum
Raw Capture Samples
Noise Diode Off Accumulators Noise Diode On Accumulators •Sy
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ork
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Signal Chain Calibration Subsystem
FE Antenna Unit
BE Ground Unit
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Signal Chain Calibration – Antenna Unit
Ethernet/PoE Interface Main Supply and drive signals
Dual Phase/Noise Calibration Signal Outputs
5 MHz Reference
Input
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Signal Chain Calibration – CD Stability
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VLBI Data Acquisition Module
VLBI Data AcQuisition (VDAQ) module – Open-source hardware development – Hot-Swappable – Deployable Temperature, Pressure, Humidity Sensing – On-board temperature sensor – Logging to SD card
Interface – Ethernet Communications – Powered over Ethernet
• Isolated DC Power Sources
– 16 Analog Monitors • Single-ended or Differential • Isolated or Non-Isolated • Configurable signal conditioning
– 40 Digital Monitors or Controls • 10 Isolated Monitors • 10 Isolated Controls • 20 Non-isolated Monitors and/or Controls
– RS232 and I2C Communications
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VLBI Data Acquisition Module
Dimensions: 13 x 10 x 2.5 cm
Ethernet/PoE Interface
Monitor/Control Signal Interface
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Schedule
March 2015: Calibration Subsystem Fab Complete
April 2015: Frontend/Backend Subsystems Fab Complete
May 2015: MCI and Integration Complete
May-July 2015: Integrated Testing at Haystack
August 2015: Ship to KPGO
August-Sept 2015: Installation/Testing
Early October 2015: Complete System Test
Oct-Dec 2015: Commissioning
Jan 2016 and beyond: IVS Integration