EMS/LRF Update

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EMS/LRF Update

• Richard Prestage

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Goals

• From April CoDR
• .EMS/LRFwill be available as a GBT
  surveying tool, allowing us to measure critical
  dimensions and characterize the antenna with
  considerably higher accuracy and convenience than
  is possible with conventional surveying
  techniques.
• Panel Report
• Careful measurements of simpler performance
  aspects are needed to evaluate if the LRF are
  useful in other modes of operation.....

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From June 16th PTCS Project Meeting

• EMS Objectives
• Production Use, 1mm or better
• Characterization of LRF accuracy
• Develop EMS/Wit/Matlab frameworks for experiments
• Feed Arm Tip Survey
• Subreflector Survey
• Schedule
• EMS Framework (completed)
• Test data set collection beginning early July,
  repeated at intervals
• Prototype trilateration EMS code August,
  developed with July data
• Completed FA survey tool September
• Prototype SR survey tool September

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Actual Schedule

• EMS sufficiently complete to execute experiments
  late May.
• EMS Refinements for real-time trilateration
  results August.
• LRFs ready for basic trilateration experiment
  end August
• First successful trilateration experiment 5th
  September

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Results

• EMS prototyping/characterization tool resounding
  success.
• LRF trilateration results c.f. traditional survey
  showed significant discrepancies.
• April to September two staff years of effort.
• Clearly would not be able to make any significant
  performance contributions for Winter 03/04.
• Temperature sensors and traditional approaches
  were showing great promise.
• Postpone further LRF work until Spring 2004.