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Guiding Control Subsystem (GCS)

Guiding Control Subsystem (GCS). Overview. 10-04-2006. Tasks. Provide information to the PCS to identify tracking errors Provide information to PSF to compensate for basic wavefront distortions (active optics). Provide an interface for TCS and humans to select a proper guide star.

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Guiding Control Subsystem (GCS)

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  1. Guiding Control Subsystem (GCS) • Overview 10-04-2006

  2. Tasks • Provide information to the PCS to identify tracking errors • Provide information to PSF to compensate for basic wavefront distortions (active optics). • Provide an interface for TCS and humans to select a proper guide star

  3. Activities • Control AutoGuider and Wavefront sensing (AGw)units (MODS, AIP & PEPSI AGw) • Control AzCam guiding and WFS cameras • Acquire and analyze camera images • calculate centroid of GS and Zernike polynomial coefficients describing the Wavefront • frequently send results to PSF and PCS subsystem

  4. GUI • provide different views for engineers and astronomers • designed mainly for the needs of astronomers and telescope operators • graphically keep track of the centroids and WF development over time • major redesign of the GUI coming soon

  5. Communication AGw hardware PCS AGw control computer GCS subsystem AzCam server Windows XP Guide Cam WFS Cam AzCam server Windows XP PSF . . . for each AGw unit .

  6. PEPSI support • PEPSI needs access to the images of the guide cam Guide Pic PEPSI Instrument PCS IIF Request Pic PEPSI hardware PEPSI control computer GCS subsystem AzCam server Windows XP Guide Cam PSF IIF is used to request guide cam image

  7. Guiding Details • Two algorithms available to determine centroid • Default is Gaussian Fit: very precise, not good with irregularly shaped objects or bad SNR • Optionally, instrument or astronomer can select Center-of-Weight (CoW) algorithm • CoW is very stable, disregards shape of object and works with very bad SNR

  8. WFS Details • algorithm just left prototype status and proved reliability under simulated conditions • uses centroiding algorithm • how to initialize the matrices with the necessary values is currently discussed with AIP AGw team • details of implementation yet to be discussed, i.e. derotation, calibration with primary mirror, etc.

  9. TCS interface • currently only a very basic interface is implemented • start / stop guiding and WFS, status data • needs improvement in cooperation with TCS developers

  10. Improvements • Foreseeable is the need for guiding on moving objects • issue has been raised with the AGw teams as neither OSU nor AIP have a solution for this yet • agreed on first do guiding on static objects • after that they want to check how their hardware can support the GCS with moving objects

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