DVA-1 Project Overview Gordon Lacy April 2014.

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Presentation transcript:

DVA-1 Project Overview Gordon Lacy April 2014

The Dish Verification Antenna, DVA-1 Built on composite knowledge from 2 previous 10m composite dishes Combined composite expertise with US TDP group (ATA design) Key Features: A 15m aperture, feed-high offset Gregorian with shaped optics Rim supported composite shell primary and secondary Composite tubes supporting feed platform and secondary Deep tubular truss backing structure

DVA-1: Designed for High Dynamic Range Capability High Thermal Performance Rim supported monocoque design along with very low CTE materials keeps all thermal movement both small and very uniform to minimize effect on beam pattern High Performance in Wind and Gravity Central compliant connector allows some structural sag without inducing unwanted distortion at center of dish Rim supported design keeps dish deflections to absolute minimum and concentrates any deflections at rim where effect on performance is small. Extremely deep truss back structure keeps dish shape as close to rigid as is possible. High Overall Optics Stability Secondary and feed platform support optimized to maximize stiffness using shape optimization software. Secondary and feed support tubes use zero and matched CTE carbon tubes for extremely high thermal stability.

DVA-1: Shaped Offset Optics Advantage Clear optical path, no blockage or scattering Combined with shaped optics, leads to very low spillover (~ -50db wide angle) Very low spillover yields very low antenna noise temperature (<6 K ground) Very low spillover results in high rejection of RFI and strong sources Shaped optics yield high efficiencies, total result is a high Aeff / Tsys

DVA-1

DVA-1: Composites for Performance Structural Test Composite Design Consideration Metallic Design Consideration Creep high static load Static Strength Material properties Fatigue Life High cyclic load Glass Transition Temp. Choose resin with sufficiently high value. NA Impact Resistance Engineering requirement Galvanic Corrosion Encapsulate reflective layer Paint and primer UV, Moisture, Humidity Paint (no primer required) and resin properties Paint and Primer Reflectivity Degradation Paint (no primer required) Fungus growth Paint

Recovery from Disaster

Crack Repair

DVA-1 Reflector Repairs

DVA-1 Reflector Accuracy After Repairs Primary reflector RMS after repairs and without antenna weighting, 1.0mm RMS with repair areas removed, 0.7mm without antenna weighting

DVA-1 Secondary Reflector Accuracy Secondary Part RMS without antenna weighting 0.2mm With antenna weighting 0.11mm

GDSatcom Secondary Reflector We have now built two sub reflectors for the GDSatcom Meerkat project RMS of reflector 0.090mm Mold RMS 0.058mm

DVA-1 Prototype Target: To meet all of the SKA performance goals, as of Q4 2012. 2014 Target To meet the SKA 2012 performance goals To investigate the SKA 2014 low frequency requirements To investigate the SKA 2014 high frequency requirements

Questions?

End Gordon Lacy, P.Eng. Tel: 250-497-2340 Gordon.lacy@nrc-cnrc.gc.ca www.nrc-cnrc.gc.ca 15