Future Development Program

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Future Development Program

• Kim Constantikes, Richard Prestage

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PTCS / High Frequency Environmental Envelope
s
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Goals for October 2004/Early 2005

• Production Q-band (50GHz) operation
  (pointing/focus, surface efficiency/beamshape)
  under benign conditions.
• Extend Q-band capabilities to normal
  conditions.
• Prototype W-band (92GHz) performance under
  benign conditions for engineering commissioning
  of Penn Array Receiver.

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Approach

• Incremental approach using combination of
  traditional techniques and innovative use of
  simple technology (temperature sensors,
  inclinometers, holography).
• Laser rangefinders in specific roles if needed.
• Concrete intermediate deliverables.
• Attempting to correct for effects on timescales
  of 1min or longer. No need to address gt1Hz
  effects at this time.
• gt No need for new control
  architecture yet.

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Approach
Instrumentation
Pointing/Focus
Algorithms
Astronomical Measurements
Efficiency/Beamshape
Instrumentation
Algorithms
Astronomical Measurements
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Instrumentation and Algorithms
Prototyping, Commissioning Experiments and
Transition to Production Capabilities
Enable W-Band Performance Under Benign
Conditions and Q-Band Performance Under Normal
Conditions
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Phased Approach Surface Improvements I

• Benign conditions only
• Static improvements at geostationary satellite
  (rigging angle) elevation Holography.
• Extend over elevation Holography, FEM
  improvements.
• Refined active surface control/data processing
  Better knobs
• Short campaign December?
• Extensive campaign February.

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Phased Approach Surface Improvements II

• Extended thermal environments
• Simple thermal corrections (more BUS sensors,
  thermal imaging, models)
• Astronomical peak-ups
• Prototype/Prepare during Summer 2004
• Highest priority for October 2004.

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Phased Approach Pointing

• Effects
• Az track irregularities
• 10s of seconds to minute timescale wind.
• Instruments
• Inclinometer
• Star Tracker
• Complete/install instrumentation Spring 2004
• Prototype/Commission Summer 2004 (astronomical
  experiments at optical, C and X-band)

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Other Items I

• Completion of current work
• Production version of dynamic temp corrections
• Production version of thermal stability monitor
• Prototype installation of inclinometers
• Active Surface Control System Upgrade
• Need to refactor Active Surface manager for
  flexible, convenient control (e.g. Zernike
  polynomials, SOAP)
• Antenna Manager Improvements
• Completion of pointing/focus model work
• Trajectory calculation improvements
• May need dynamic corrections to subreflector (0.1
  Hz)

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Other Items II

• Need to be able to characterize conditions for
  high-frequency observing
• Site Interferometer
• Radiometer
• Climate
• Cannot address these with resources currently
  available to PTCS group

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Summary

• Address performance improvements incrementally.
• Productionize thermal improvements
• Development priorities Wind, az track, surface
  phase I
• We have the real antenna available to us use
  it!
• Many original concerns have turned out to be less
  important than expected.
• Only need to address ltlt 1Hz effects in coming
  year.

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Schedule
Production Q-band, Engineering W-band for winter
2004
Q4 2003
Q1 2004
Q2 2004
Q3 2004
Production versions Dynamic pointing/focus
Static Surface Accuracy improvements
Pointing Instrumentation/ Techniques
Pointing Commissioning Experiments/ production use
Surface Improvements II
Q-band under normal conditions W-band under
benign conditions