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EMS/LRF Update

EMS/LRF Update. Richard Prestage. Goals. From April CoDR: “….EMS/LRF…will 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”.

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EMS/LRF Update

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  1. EMS/LRF Update Richard Prestage

  2. Goals • From April CoDR: “….EMS/LRF…will 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.....”

  3. 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

  4. 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

  5. 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.

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