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This talk by Richard Prestage and Kim Constantikes presents an in-depth overview of cutting-edge beamswitching techniques, particularly utilizing subreflector and tertiary systems. Key areas include checking subreflector collimation and maintaining fixed primary-subreflector distances. Attendees will learn how the Antenna Manager interprets commands and generates demands for azimuth and elevation tracking, ensuring desired motion of the beam without affecting target positioning. The PTCS control strategy will also be explored, detailing how it influences the response of various optical elements.
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PTCS Observing Scenarios Richard Prestage/Kim Constantikes
Overview of talk • Introductory remarks • S1: beamswitching with subreflector • S2: beamswitching with tertiary • E1: checking subreflector collimation • E2: fixed primary-subreflector distance • S3: o-t-f mapping with tertiary scanning
Introductory remarks • Antenna Manager interprets commanded track, and generates stream of (az,el) demands • For desired motion of beam on sky; specify through main drives track/offset -> Wae /Oae • For motion of optical elements which should not affect target position on sky, specify through subreflector / feed / [tertiary] track -> OSR / OF / OT • PTCS control strategy will determine which optical element(s) will respond to specific input demands